[1] The main source of Naphthalene is -
A.
Charcoal
B.
Camphor
C.
Coal-tar
D.
Diesel
Ans:
Coal-tar
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[2] The material used in solar cells contains -
A.
Tin
B.
Silicon
C.
Caesium
D.
Thallium
Ans:
Silicon
Explanation :
A solar cell (also called a photovoltaic cell) is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect. Materials presently used for photovoltaic solar cells include mono-crystalline silicon, polycrystalline silicon, amorphous silicon, cadmium telluride, and copper iridium selenide/sulfide.
[3] Quartz is a crystalline form of -
A.
Alumina
B.
Glass
C.
Silica
D.
Limestone
Ans:
Silica
Explanation :
Quartz is made up of a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2. Tridymite and cristobalite are high- temperature polymorphs of SiO2 that occur in high-silica volcanic rocks. Coesite is a denser polymorph of quartz found in some meteorite impact sites and in metamorphic rocks.
[4] In vulcanisation process, rubber can be hardened by adding -
A.
Nitrogen
B.
Silicon
C.
Sulphur
D.
Alcohol
Ans:
Sulphur
Explanation :
In order to give more strength and more elasticity, natural rubber is heated with sulphur or sulphur compounds at 150°C temperature. Vulcanized rubber has good tensile strength.
[5] Urea is a -
A.
Sodium fertilizer
B.
Phosphatic fertilizer
C.
Nitrogenous fertilizer
D.
Potassium fertilizer
Ans:
Nitrogenous fertilizer
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use.
[6] During inter conversion of energy from one form to other forms, total energy at any time remains–
A.
constant
B.
zero
C.
increasing
D.
decreasing
Ans:
constant
Explanation :
During interconversion of energy from one form to other forms, total energy at any time remains constant.
[7] Which of the following is a physical change?
A.
oxidation
B.
reduction
C.
sublimation
D.
decomposition
Ans:
sublimation
Explanation :
Sublimation is a type of phase transition, or a change in a state of matter, just like melting, freezing, and evaporation.
[8] Sea weeds are important source of –
A.
iron
B.
chlorine
C.
bromine
D.
iodine
Ans:
iodine
Explanation :
Seaweed is a source of iodine, necessaly for thyroid function and to prevent goitre. However, an excess of iodine is suspected in the heightened cancer risk in Japanese who consume a lot of the plant, and even bigger risks in post-mempausal women.
[9] Which gas is used to manufacture vanaspati from vegetable oil is -
A.
carbon dioxide
B.
nitrogen
C.
oxygen
D.
hydrogen
Ans:
hydrogen
Explanation :
Hydrogenation - to treat with hydrogen - is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst. The process is commonly employed to reduce or saturate organic compounds. The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[10] The pH of a neutral solution is -
A.
0-7
B.
7
C.
7-14
D.
None of the above
Ans:
7
Explanation :
The pH of a neutral solution is 7. Values less than 7 on the pH scale represent an acidic solution. As the pH value increases from 7 to 14, the solution turns more basic.
[11] The nucleus of an atom consists of -
A.
electrons and neutrons
B.
electrons and protons
C.
protons and neutrons
D.
All of the above
Ans:
protons and neutrons
Explanation :
The atomic nucleus consists of nucleons—protons and neutrons. Protons and neutrons are made of quarks and held together by the strong force generated by gluon exchange between quarks.
[12] Detergents are –
A.
Sodium salts of fatty acids
B.
Sodium salts of sulphonic acids
C.
Sodium salt of benzoic acid
D.
None of the above
Ans:
Sodium salts of sulphonic acids
Explanation :
A detergent is a surfactant or a mixture of surfactants with "cleaning properties in dilute solutiops." These substances are usually alkylbenzenesulfonates, a family of compounds that are similar to soap but are more soluble in hard water, because the polar sulfonate (of detergents) is less likely than the polar carboxyl (of soap) to bind to calcium and other ions found in hard water. In most household contexts, the term detergent by itself refers specifically to laundry detergent or dish detergent, as opposed to hand soap or other types of cleaning agents.
[13] The noble gas used in radiotherapy is –
A.
neon
B.
argon
C.
radon
D.
xenon
Ans:
radon
Explanation :
An early-20th-century form of quackery was the treatment of maladies in a radiotorium. It was a small, sealed room for patients to be exposed to radon for its "medicinal effects". The carcinogenic nature of radon due to its ionizing radiation became apparent later on. Radon's molecule-damaging radioactivity has been used to kill cancerous cells. It does not, however, increase the health of healthy cells. In fact, the ionizing radiation causes the formation of free radicals, which results in genetic and other cell damage, resulting in increased rates of illness, including cancer.
[14] Ethanol containing 5% water is known as –
A.
rectified spirit
B.
denatured spirit
C.
methylated alcohol
D.
power alcohol
Ans:
rectified spirit
Explanation :
A rectified spirit, rectified alcohol, or neutral spirit is highly concentrated ethanol which has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume (ABV). Rectified spirits are used in mixed drinks, in the production of liqueurs, for medicinal purposes, and as a household solvent.
[15] The important ore of aluminium is –
A.
bauxite
B.
cryolite
C.
fluorspar
D.
haematite
Ans:
bauxite
Explanation :
Bauxite is an aluminium ore and is the main source of aluminium. This form of rock consists mostly of the minerals gibbsite, boehmite and diaspore, in a mixture with the two iron oxides goethite and hematite, the clay mineral kaolinite, and small amounts of anatase TiO2. Bauxite was named after the village Les Baux in southern France, where it was first recognised as containing aluminium and named by the French geologist Pierre Berthier in 1821. The lateritic bauxites are found mostly in the countries of the tropics. They were formed by lateritization of various silicate rocks such as granite, gneiss, basalt, syenite, and shale. In comparison with the iron-rich laterites, the formation of bauxites demands even more on intense weathering conditions in a location with very good drainage. This enables the dissolution of the kaolinite and the precipitation of the gibbsite. Zones with highest aluminium content are frequently located below a ferruginous surface layer.
[16] Which of the following is not present in German-silver?
A.
Copper
B.
Nickel
C.
Silver
D.
Zinc
Ans:
Silver
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated. The name "German silver" refers to its development by 19th-century German metalworkers in imitation of the Chinese alloy known as paktong.
[17] The major harmful gas emitted by automobile vehicles which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood's ability to carry oxygen: overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[18] Who discovered the atom bomb?
A.
Madam Curie
B.
Pierre Curie
C.
Otto Hahn
D.
Albert Einstein
Ans:
Otto Hahn
Explanation :
Otto Hahn, (8 March, 1879 - 28 July, 1968) was a German chemist and Nobel laureate, a pioneer in the fields of radioactivity and radiochemistry. He is regarded as "the father of nuclear chemistry". On 15 November 1945 the Royal Swedish Academy of Sciences announced that Hahn had been awarded the 1944 Nobel Prize in Chemistry "for his discovery of the fission of heavy atomic nuclei." Otto Hahn received many governmental honours and academic awards from all over the world for his scientific work.
[19] The major component of honey is -
A.
glucose
B.
sucrose
C.
maltose
D.
fructose
Ans:
fructose
Explanation :
Honey is a mixture of sugars and other compounds. With respect to carbohydrates, honey is mainly fructose (about 38.5%) and glucose (about 31.0%), making it similar to the synthetically produced inverted sugar syrup, which is approximately 48% fructose, 47% glucose, and 5% sucrose. Honey's remaining carbohydrates include maltose, sucrose, and other complex carbohydrate.
[20] A body moving in a circular path with a constant speed has a -
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path. A body moving at constant speed in a circular path experiences an acceleration directed towards the centre of the circular path. This acceleration is called a centripetal acceleration and is provided by a centripetal force. Overall, the displacement, velocity and acceleration are vector quantities. They change; but kinetic energy remains constant because the speed is constant.
[21] is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.
A.
Cellulose
B.
Glycogen
C.
Pectin
D.
Chitin
Ans:
Glycogen
Explanation :
Glycogen is a multi branched polysaccharide of glucose that serves as a form of emery storage in humans animals, and fungi.
[22] Potassium Permanganate is used for purifying drinking water, because -
A.
it dissolves the impurities of water
B.
It is a sterilizing agent
C.
It is an oxidising agent
D.
It is a reducing agent
Ans:
It is an oxidising agent
Explanation :
Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
[23] Diamond is harder than graphite because of –
A.
difference in layers of atoms
B.
tetrahedral structure of diamond
C.
difference of crystalline structures
D.
None of these
Ans:
difference in layers of atoms
Explanation :
Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite's structure is very loose, with its bonds forming layers.
[24] Gobar gas contains mainly –
A.
methane
B.
ethylene
C.
propylene
D.
acetylene
Ans:
methane
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood. It also helps in maintaining ecological balance, in rural sanitation and it needs Lower capital cost and almost cost free maintenance.
[25] What is the most commonly used substance in fluorescent tubes?
A.
Sodium oxide and argon
B.
Sodium vapour and neon
C.
Mercury vapour and argon
D.
Mercury oxide and neon
Ans:
Mercury vapour and argon
Explanation :
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and argon. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[2] The material used in solar cells contains -
A.
Tin
B.
Silicon
C.
Caesium
D.
Thallium
Ans:
Silicon
Explanation :
A solar cell (also called a photovoltaic cell) is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect. Materials presently used for photovoltaic solar cells include mono-crystalline silicon, polycrystalline silicon, amorphous silicon, cadmium telluride, and copper iridium selenide/sulfide.
[3] Quartz is a crystalline form of -
A.
Alumina
B.
Glass
C.
Silica
D.
Limestone
Ans:
Silica
Explanation :
Quartz is made up of a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2. Tridymite and cristobalite are high- temperature polymorphs of SiO2 that occur in high-silica volcanic rocks. Coesite is a denser polymorph of quartz found in some meteorite impact sites and in metamorphic rocks.
[4] In vulcanisation process, rubber can be hardened by adding -
A.
Nitrogen
B.
Silicon
C.
Sulphur
D.
Alcohol
Ans:
Sulphur
Explanation :
In order to give more strength and more elasticity, natural rubber is heated with sulphur or sulphur compounds at 150°C temperature. Vulcanized rubber has good tensile strength.
[5] Urea is a -
A.
Sodium fertilizer
B.
Phosphatic fertilizer
C.
Nitrogenous fertilizer
D.
Potassium fertilizer
Ans:
Nitrogenous fertilizer
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use.
[6] During inter conversion of energy from one form to other forms, total energy at any time remains–
A.
constant
B.
zero
C.
increasing
D.
decreasing
Ans:
constant
Explanation :
During interconversion of energy from one form to other forms, total energy at any time remains constant.
[7] Which of the following is a physical change?
A.
oxidation
B.
reduction
C.
sublimation
D.
decomposition
Ans:
sublimation
Explanation :
Sublimation is a type of phase transition, or a change in a state of matter, just like melting, freezing, and evaporation.
[8] Sea weeds are important source of –
A.
iron
B.
chlorine
C.
bromine
D.
iodine
Ans:
iodine
Explanation :
Seaweed is a source of iodine, necessaly for thyroid function and to prevent goitre. However, an excess of iodine is suspected in the heightened cancer risk in Japanese who consume a lot of the plant, and even bigger risks in post-mempausal women.
[9] Which gas is used to manufacture vanaspati from vegetable oil is -
A.
carbon dioxide
B.
nitrogen
C.
oxygen
D.
hydrogen
Ans:
hydrogen
Explanation :
Hydrogenation - to treat with hydrogen - is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst. The process is commonly employed to reduce or saturate organic compounds. The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[10] The pH of a neutral solution is -
A.
0-7
B.
7
C.
7-14
D.
None of the above
Ans:
7
Explanation :
The pH of a neutral solution is 7. Values less than 7 on the pH scale represent an acidic solution. As the pH value increases from 7 to 14, the solution turns more basic.
[11] The nucleus of an atom consists of -
A.
electrons and neutrons
B.
electrons and protons
C.
protons and neutrons
D.
All of the above
Ans:
protons and neutrons
Explanation :
The atomic nucleus consists of nucleons—protons and neutrons. Protons and neutrons are made of quarks and held together by the strong force generated by gluon exchange between quarks.
[12] Detergents are –
A.
Sodium salts of fatty acids
B.
Sodium salts of sulphonic acids
C.
Sodium salt of benzoic acid
D.
None of the above
Ans:
Sodium salts of sulphonic acids
Explanation :
A detergent is a surfactant or a mixture of surfactants with "cleaning properties in dilute solutiops." These substances are usually alkylbenzenesulfonates, a family of compounds that are similar to soap but are more soluble in hard water, because the polar sulfonate (of detergents) is less likely than the polar carboxyl (of soap) to bind to calcium and other ions found in hard water. In most household contexts, the term detergent by itself refers specifically to laundry detergent or dish detergent, as opposed to hand soap or other types of cleaning agents.
[13] The noble gas used in radiotherapy is –
A.
neon
B.
argon
C.
radon
D.
xenon
Ans:
radon
Explanation :
An early-20th-century form of quackery was the treatment of maladies in a radiotorium. It was a small, sealed room for patients to be exposed to radon for its "medicinal effects". The carcinogenic nature of radon due to its ionizing radiation became apparent later on. Radon's molecule-damaging radioactivity has been used to kill cancerous cells. It does not, however, increase the health of healthy cells. In fact, the ionizing radiation causes the formation of free radicals, which results in genetic and other cell damage, resulting in increased rates of illness, including cancer.
[14] Ethanol containing 5% water is known as –
A.
rectified spirit
B.
denatured spirit
C.
methylated alcohol
D.
power alcohol
Ans:
rectified spirit
Explanation :
A rectified spirit, rectified alcohol, or neutral spirit is highly concentrated ethanol which has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume (ABV). Rectified spirits are used in mixed drinks, in the production of liqueurs, for medicinal purposes, and as a household solvent.
[15] The important ore of aluminium is –
A.
bauxite
B.
cryolite
C.
fluorspar
D.
haematite
Ans:
bauxite
Explanation :
Bauxite is an aluminium ore and is the main source of aluminium. This form of rock consists mostly of the minerals gibbsite, boehmite and diaspore, in a mixture with the two iron oxides goethite and hematite, the clay mineral kaolinite, and small amounts of anatase TiO2. Bauxite was named after the village Les Baux in southern France, where it was first recognised as containing aluminium and named by the French geologist Pierre Berthier in 1821. The lateritic bauxites are found mostly in the countries of the tropics. They were formed by lateritization of various silicate rocks such as granite, gneiss, basalt, syenite, and shale. In comparison with the iron-rich laterites, the formation of bauxites demands even more on intense weathering conditions in a location with very good drainage. This enables the dissolution of the kaolinite and the precipitation of the gibbsite. Zones with highest aluminium content are frequently located below a ferruginous surface layer.
[16] Which of the following is not present in German-silver?
A.
Copper
B.
Nickel
C.
Silver
D.
Zinc
Ans:
Silver
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated. The name "German silver" refers to its development by 19th-century German metalworkers in imitation of the Chinese alloy known as paktong.
[17] The major harmful gas emitted by automobile vehicles which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood's ability to carry oxygen: overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[18] Who discovered the atom bomb?
A.
Madam Curie
B.
Pierre Curie
C.
Otto Hahn
D.
Albert Einstein
Ans:
Otto Hahn
Explanation :
Otto Hahn, (8 March, 1879 - 28 July, 1968) was a German chemist and Nobel laureate, a pioneer in the fields of radioactivity and radiochemistry. He is regarded as "the father of nuclear chemistry". On 15 November 1945 the Royal Swedish Academy of Sciences announced that Hahn had been awarded the 1944 Nobel Prize in Chemistry "for his discovery of the fission of heavy atomic nuclei." Otto Hahn received many governmental honours and academic awards from all over the world for his scientific work.
[19] The major component of honey is -
A.
glucose
B.
sucrose
C.
maltose
D.
fructose
Ans:
fructose
Explanation :
Honey is a mixture of sugars and other compounds. With respect to carbohydrates, honey is mainly fructose (about 38.5%) and glucose (about 31.0%), making it similar to the synthetically produced inverted sugar syrup, which is approximately 48% fructose, 47% glucose, and 5% sucrose. Honey's remaining carbohydrates include maltose, sucrose, and other complex carbohydrate.
[20] A body moving in a circular path with a constant speed has a -
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path. A body moving at constant speed in a circular path experiences an acceleration directed towards the centre of the circular path. This acceleration is called a centripetal acceleration and is provided by a centripetal force. Overall, the displacement, velocity and acceleration are vector quantities. They change; but kinetic energy remains constant because the speed is constant.
[21] is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.
A.
Cellulose
B.
Glycogen
C.
Pectin
D.
Chitin
Ans:
Glycogen
Explanation :
Glycogen is a multi branched polysaccharide of glucose that serves as a form of emery storage in humans animals, and fungi.
[22] Potassium Permanganate is used for purifying drinking water, because -
A.
it dissolves the impurities of water
B.
It is a sterilizing agent
C.
It is an oxidising agent
D.
It is a reducing agent
Ans:
It is an oxidising agent
Explanation :
Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
[23] Diamond is harder than graphite because of –
A.
difference in layers of atoms
B.
tetrahedral structure of diamond
C.
difference of crystalline structures
D.
None of these
Ans:
difference in layers of atoms
Explanation :
Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite's structure is very loose, with its bonds forming layers.
[24] Gobar gas contains mainly –
A.
methane
B.
ethylene
C.
propylene
D.
acetylene
Ans:
methane
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood. It also helps in maintaining ecological balance, in rural sanitation and it needs Lower capital cost and almost cost free maintenance.
[25] What is the most commonly used substance in fluorescent tubes?
A.
Sodium oxide and argon
B.
Sodium vapour and neon
C.
Mercury vapour and argon
D.
Mercury oxide and neon
Ans:
Mercury vapour and argon
Explanation :
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and argon. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.
Explanation :
Quartz is made up of a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2. Tridymite and cristobalite are high- temperature polymorphs of SiO2 that occur in high-silica volcanic rocks. Coesite is a denser polymorph of quartz found in some meteorite impact sites and in metamorphic rocks.
[4] In vulcanisation process, rubber can be hardened by adding -
A.
Nitrogen
B.
Silicon
C.
Sulphur
D.
Alcohol
Ans:
Sulphur
Explanation :
In order to give more strength and more elasticity, natural rubber is heated with sulphur or sulphur compounds at 150°C temperature. Vulcanized rubber has good tensile strength.
[5] Urea is a -
A.
Sodium fertilizer
B.
Phosphatic fertilizer
C.
Nitrogenous fertilizer
D.
Potassium fertilizer
Ans:
Nitrogenous fertilizer
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use.
[6] During inter conversion of energy from one form to other forms, total energy at any time remains–
A.
constant
B.
zero
C.
increasing
D.
decreasing
Ans:
constant
Explanation :
During interconversion of energy from one form to other forms, total energy at any time remains constant.
[7] Which of the following is a physical change?
A.
oxidation
B.
reduction
C.
sublimation
D.
decomposition
Ans:
sublimation
Explanation :
Sublimation is a type of phase transition, or a change in a state of matter, just like melting, freezing, and evaporation.
[8] Sea weeds are important source of –
A.
iron
B.
chlorine
C.
bromine
D.
iodine
Ans:
iodine
Explanation :
Seaweed is a source of iodine, necessaly for thyroid function and to prevent goitre. However, an excess of iodine is suspected in the heightened cancer risk in Japanese who consume a lot of the plant, and even bigger risks in post-mempausal women.
[9] Which gas is used to manufacture vanaspati from vegetable oil is -
A.
carbon dioxide
B.
nitrogen
C.
oxygen
D.
hydrogen
Ans:
hydrogen
Explanation :
Hydrogenation - to treat with hydrogen - is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst. The process is commonly employed to reduce or saturate organic compounds. The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[10] The pH of a neutral solution is -
A.
0-7
B.
7
C.
7-14
D.
None of the above
Ans:
7
Explanation :
The pH of a neutral solution is 7. Values less than 7 on the pH scale represent an acidic solution. As the pH value increases from 7 to 14, the solution turns more basic.
[11] The nucleus of an atom consists of -
A.
electrons and neutrons
B.
electrons and protons
C.
protons and neutrons
D.
All of the above
Ans:
protons and neutrons
Explanation :
The atomic nucleus consists of nucleons—protons and neutrons. Protons and neutrons are made of quarks and held together by the strong force generated by gluon exchange between quarks.
[12] Detergents are –
A.
Sodium salts of fatty acids
B.
Sodium salts of sulphonic acids
C.
Sodium salt of benzoic acid
D.
None of the above
Ans:
Sodium salts of sulphonic acids
Explanation :
A detergent is a surfactant or a mixture of surfactants with "cleaning properties in dilute solutiops." These substances are usually alkylbenzenesulfonates, a family of compounds that are similar to soap but are more soluble in hard water, because the polar sulfonate (of detergents) is less likely than the polar carboxyl (of soap) to bind to calcium and other ions found in hard water. In most household contexts, the term detergent by itself refers specifically to laundry detergent or dish detergent, as opposed to hand soap or other types of cleaning agents.
[13] The noble gas used in radiotherapy is –
A.
neon
B.
argon
C.
radon
D.
xenon
Ans:
radon
Explanation :
An early-20th-century form of quackery was the treatment of maladies in a radiotorium. It was a small, sealed room for patients to be exposed to radon for its "medicinal effects". The carcinogenic nature of radon due to its ionizing radiation became apparent later on. Radon's molecule-damaging radioactivity has been used to kill cancerous cells. It does not, however, increase the health of healthy cells. In fact, the ionizing radiation causes the formation of free radicals, which results in genetic and other cell damage, resulting in increased rates of illness, including cancer.
[14] Ethanol containing 5% water is known as –
A.
rectified spirit
B.
denatured spirit
C.
methylated alcohol
D.
power alcohol
Ans:
rectified spirit
Explanation :
A rectified spirit, rectified alcohol, or neutral spirit is highly concentrated ethanol which has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume (ABV). Rectified spirits are used in mixed drinks, in the production of liqueurs, for medicinal purposes, and as a household solvent.
[15] The important ore of aluminium is –
A.
bauxite
B.
cryolite
C.
fluorspar
D.
haematite
Ans:
bauxite
Explanation :
Bauxite is an aluminium ore and is the main source of aluminium. This form of rock consists mostly of the minerals gibbsite, boehmite and diaspore, in a mixture with the two iron oxides goethite and hematite, the clay mineral kaolinite, and small amounts of anatase TiO2. Bauxite was named after the village Les Baux in southern France, where it was first recognised as containing aluminium and named by the French geologist Pierre Berthier in 1821. The lateritic bauxites are found mostly in the countries of the tropics. They were formed by lateritization of various silicate rocks such as granite, gneiss, basalt, syenite, and shale. In comparison with the iron-rich laterites, the formation of bauxites demands even more on intense weathering conditions in a location with very good drainage. This enables the dissolution of the kaolinite and the precipitation of the gibbsite. Zones with highest aluminium content are frequently located below a ferruginous surface layer.
[16] Which of the following is not present in German-silver?
A.
Copper
B.
Nickel
C.
Silver
D.
Zinc
Ans:
Silver
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated. The name "German silver" refers to its development by 19th-century German metalworkers in imitation of the Chinese alloy known as paktong.
[17] The major harmful gas emitted by automobile vehicles which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood's ability to carry oxygen: overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[18] Who discovered the atom bomb?
A.
Madam Curie
B.
Pierre Curie
C.
Otto Hahn
D.
Albert Einstein
Ans:
Otto Hahn
Explanation :
Otto Hahn, (8 March, 1879 - 28 July, 1968) was a German chemist and Nobel laureate, a pioneer in the fields of radioactivity and radiochemistry. He is regarded as "the father of nuclear chemistry". On 15 November 1945 the Royal Swedish Academy of Sciences announced that Hahn had been awarded the 1944 Nobel Prize in Chemistry "for his discovery of the fission of heavy atomic nuclei." Otto Hahn received many governmental honours and academic awards from all over the world for his scientific work.
[19] The major component of honey is -
A.
glucose
B.
sucrose
C.
maltose
D.
fructose
Ans:
fructose
Explanation :
Honey is a mixture of sugars and other compounds. With respect to carbohydrates, honey is mainly fructose (about 38.5%) and glucose (about 31.0%), making it similar to the synthetically produced inverted sugar syrup, which is approximately 48% fructose, 47% glucose, and 5% sucrose. Honey's remaining carbohydrates include maltose, sucrose, and other complex carbohydrate.
[20] A body moving in a circular path with a constant speed has a -
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path. A body moving at constant speed in a circular path experiences an acceleration directed towards the centre of the circular path. This acceleration is called a centripetal acceleration and is provided by a centripetal force. Overall, the displacement, velocity and acceleration are vector quantities. They change; but kinetic energy remains constant because the speed is constant.
[21] is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.
A.
Cellulose
B.
Glycogen
C.
Pectin
D.
Chitin
Ans:
Glycogen
Explanation :
Glycogen is a multi branched polysaccharide of glucose that serves as a form of emery storage in humans animals, and fungi.
[22] Potassium Permanganate is used for purifying drinking water, because -
A.
it dissolves the impurities of water
B.
It is a sterilizing agent
C.
It is an oxidising agent
D.
It is a reducing agent
Ans:
It is an oxidising agent
Explanation :
Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
[23] Diamond is harder than graphite because of –
A.
difference in layers of atoms
B.
tetrahedral structure of diamond
C.
difference of crystalline structures
D.
None of these
Ans:
difference in layers of atoms
Explanation :
Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite's structure is very loose, with its bonds forming layers.
[24] Gobar gas contains mainly –
A.
methane
B.
ethylene
C.
propylene
D.
acetylene
Ans:
methane
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood. It also helps in maintaining ecological balance, in rural sanitation and it needs Lower capital cost and almost cost free maintenance.
[25] What is the most commonly used substance in fluorescent tubes?
A.
Sodium oxide and argon
B.
Sodium vapour and neon
C.
Mercury vapour and argon
D.
Mercury oxide and neon
Ans:
Mercury vapour and argon
Explanation :
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and argon. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.
Explanation :
More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use.
[6] During inter conversion of energy from one form to other forms, total energy at any time remains–
A.
constant
B.
zero
C.
increasing
D.
decreasing
Ans:
constant
Explanation :
During interconversion of energy from one form to other forms, total energy at any time remains constant.
[7] Which of the following is a physical change?
A.
oxidation
B.
reduction
C.
sublimation
D.
decomposition
Ans:
sublimation
Explanation :
Sublimation is a type of phase transition, or a change in a state of matter, just like melting, freezing, and evaporation.
[8] Sea weeds are important source of –
A.
iron
B.
chlorine
C.
bromine
D.
iodine
Ans:
iodine
Explanation :
Seaweed is a source of iodine, necessaly for thyroid function and to prevent goitre. However, an excess of iodine is suspected in the heightened cancer risk in Japanese who consume a lot of the plant, and even bigger risks in post-mempausal women.
[9] Which gas is used to manufacture vanaspati from vegetable oil is -
A.
carbon dioxide
B.
nitrogen
C.
oxygen
D.
hydrogen
Ans:
hydrogen
Explanation :
Hydrogenation - to treat with hydrogen - is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst. The process is commonly employed to reduce or saturate organic compounds. The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[10] The pH of a neutral solution is -
A.
0-7
B.
7
C.
7-14
D.
None of the above
Ans:
7
Explanation :
The pH of a neutral solution is 7. Values less than 7 on the pH scale represent an acidic solution. As the pH value increases from 7 to 14, the solution turns more basic.
[11] The nucleus of an atom consists of -
A.
electrons and neutrons
B.
electrons and protons
C.
protons and neutrons
D.
All of the above
Ans:
protons and neutrons
Explanation :
The atomic nucleus consists of nucleons—protons and neutrons. Protons and neutrons are made of quarks and held together by the strong force generated by gluon exchange between quarks.
[12] Detergents are –
A.
Sodium salts of fatty acids
B.
Sodium salts of sulphonic acids
C.
Sodium salt of benzoic acid
D.
None of the above
Ans:
Sodium salts of sulphonic acids
Explanation :
A detergent is a surfactant or a mixture of surfactants with "cleaning properties in dilute solutiops." These substances are usually alkylbenzenesulfonates, a family of compounds that are similar to soap but are more soluble in hard water, because the polar sulfonate (of detergents) is less likely than the polar carboxyl (of soap) to bind to calcium and other ions found in hard water. In most household contexts, the term detergent by itself refers specifically to laundry detergent or dish detergent, as opposed to hand soap or other types of cleaning agents.
[13] The noble gas used in radiotherapy is –
A.
neon
B.
argon
C.
radon
D.
xenon
Ans:
radon
Explanation :
An early-20th-century form of quackery was the treatment of maladies in a radiotorium. It was a small, sealed room for patients to be exposed to radon for its "medicinal effects". The carcinogenic nature of radon due to its ionizing radiation became apparent later on. Radon's molecule-damaging radioactivity has been used to kill cancerous cells. It does not, however, increase the health of healthy cells. In fact, the ionizing radiation causes the formation of free radicals, which results in genetic and other cell damage, resulting in increased rates of illness, including cancer.
[14] Ethanol containing 5% water is known as –
A.
rectified spirit
B.
denatured spirit
C.
methylated alcohol
D.
power alcohol
Ans:
rectified spirit
Explanation :
A rectified spirit, rectified alcohol, or neutral spirit is highly concentrated ethanol which has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume (ABV). Rectified spirits are used in mixed drinks, in the production of liqueurs, for medicinal purposes, and as a household solvent.
[15] The important ore of aluminium is –
A.
bauxite
B.
cryolite
C.
fluorspar
D.
haematite
Ans:
bauxite
Explanation :
Bauxite is an aluminium ore and is the main source of aluminium. This form of rock consists mostly of the minerals gibbsite, boehmite and diaspore, in a mixture with the two iron oxides goethite and hematite, the clay mineral kaolinite, and small amounts of anatase TiO2. Bauxite was named after the village Les Baux in southern France, where it was first recognised as containing aluminium and named by the French geologist Pierre Berthier in 1821. The lateritic bauxites are found mostly in the countries of the tropics. They were formed by lateritization of various silicate rocks such as granite, gneiss, basalt, syenite, and shale. In comparison with the iron-rich laterites, the formation of bauxites demands even more on intense weathering conditions in a location with very good drainage. This enables the dissolution of the kaolinite and the precipitation of the gibbsite. Zones with highest aluminium content are frequently located below a ferruginous surface layer.
[16] Which of the following is not present in German-silver?
A.
Copper
B.
Nickel
C.
Silver
D.
Zinc
Ans:
Silver
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated. The name "German silver" refers to its development by 19th-century German metalworkers in imitation of the Chinese alloy known as paktong.
[17] The major harmful gas emitted by automobile vehicles which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood's ability to carry oxygen: overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[18] Who discovered the atom bomb?
A.
Madam Curie
B.
Pierre Curie
C.
Otto Hahn
D.
Albert Einstein
Ans:
Otto Hahn
Explanation :
Otto Hahn, (8 March, 1879 - 28 July, 1968) was a German chemist and Nobel laureate, a pioneer in the fields of radioactivity and radiochemistry. He is regarded as "the father of nuclear chemistry". On 15 November 1945 the Royal Swedish Academy of Sciences announced that Hahn had been awarded the 1944 Nobel Prize in Chemistry "for his discovery of the fission of heavy atomic nuclei." Otto Hahn received many governmental honours and academic awards from all over the world for his scientific work.
[19] The major component of honey is -
A.
glucose
B.
sucrose
C.
maltose
D.
fructose
Ans:
fructose
Explanation :
Honey is a mixture of sugars and other compounds. With respect to carbohydrates, honey is mainly fructose (about 38.5%) and glucose (about 31.0%), making it similar to the synthetically produced inverted sugar syrup, which is approximately 48% fructose, 47% glucose, and 5% sucrose. Honey's remaining carbohydrates include maltose, sucrose, and other complex carbohydrate.
[20] A body moving in a circular path with a constant speed has a -
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path. A body moving at constant speed in a circular path experiences an acceleration directed towards the centre of the circular path. This acceleration is called a centripetal acceleration and is provided by a centripetal force. Overall, the displacement, velocity and acceleration are vector quantities. They change; but kinetic energy remains constant because the speed is constant.
[21] is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.
A.
Cellulose
B.
Glycogen
C.
Pectin
D.
Chitin
Ans:
Glycogen
Explanation :
Glycogen is a multi branched polysaccharide of glucose that serves as a form of emery storage in humans animals, and fungi.
[22] Potassium Permanganate is used for purifying drinking water, because -
A.
it dissolves the impurities of water
B.
It is a sterilizing agent
C.
It is an oxidising agent
D.
It is a reducing agent
Ans:
It is an oxidising agent
Explanation :
Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
[23] Diamond is harder than graphite because of –
A.
difference in layers of atoms
B.
tetrahedral structure of diamond
C.
difference of crystalline structures
D.
None of these
Ans:
difference in layers of atoms
Explanation :
Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite's structure is very loose, with its bonds forming layers.
[24] Gobar gas contains mainly –
A.
methane
B.
ethylene
C.
propylene
D.
acetylene
Ans:
methane
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood. It also helps in maintaining ecological balance, in rural sanitation and it needs Lower capital cost and almost cost free maintenance.
[25] What is the most commonly used substance in fluorescent tubes?
A.
Sodium oxide and argon
B.
Sodium vapour and neon
C.
Mercury vapour and argon
D.
Mercury oxide and neon
Ans:
Mercury vapour and argon
Explanation :
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and argon. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.
Explanation :
Sublimation is a type of phase transition, or a change in a state of matter, just like melting, freezing, and evaporation.
[8] Sea weeds are important source of –
A.
iron
B.
chlorine
C.
bromine
D.
iodine
Ans:
iodine
Explanation :
Seaweed is a source of iodine, necessaly for thyroid function and to prevent goitre. However, an excess of iodine is suspected in the heightened cancer risk in Japanese who consume a lot of the plant, and even bigger risks in post-mempausal women.
[9] Which gas is used to manufacture vanaspati from vegetable oil is -
A.
carbon dioxide
B.
nitrogen
C.
oxygen
D.
hydrogen
Ans:
hydrogen
Explanation :
Hydrogenation - to treat with hydrogen - is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst. The process is commonly employed to reduce or saturate organic compounds. The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[10] The pH of a neutral solution is -
A.
0-7
B.
7
C.
7-14
D.
None of the above
Ans:
7
Explanation :
The pH of a neutral solution is 7. Values less than 7 on the pH scale represent an acidic solution. As the pH value increases from 7 to 14, the solution turns more basic.
[11] The nucleus of an atom consists of -
A.
electrons and neutrons
B.
electrons and protons
C.
protons and neutrons
D.
All of the above
Ans:
protons and neutrons
Explanation :
The atomic nucleus consists of nucleons—protons and neutrons. Protons and neutrons are made of quarks and held together by the strong force generated by gluon exchange between quarks.
[12] Detergents are –
A.
Sodium salts of fatty acids
B.
Sodium salts of sulphonic acids
C.
Sodium salt of benzoic acid
D.
None of the above
Ans:
Sodium salts of sulphonic acids
Explanation :
A detergent is a surfactant or a mixture of surfactants with "cleaning properties in dilute solutiops." These substances are usually alkylbenzenesulfonates, a family of compounds that are similar to soap but are more soluble in hard water, because the polar sulfonate (of detergents) is less likely than the polar carboxyl (of soap) to bind to calcium and other ions found in hard water. In most household contexts, the term detergent by itself refers specifically to laundry detergent or dish detergent, as opposed to hand soap or other types of cleaning agents.
[13] The noble gas used in radiotherapy is –
A.
neon
B.
argon
C.
radon
D.
xenon
Ans:
radon
Explanation :
An early-20th-century form of quackery was the treatment of maladies in a radiotorium. It was a small, sealed room for patients to be exposed to radon for its "medicinal effects". The carcinogenic nature of radon due to its ionizing radiation became apparent later on. Radon's molecule-damaging radioactivity has been used to kill cancerous cells. It does not, however, increase the health of healthy cells. In fact, the ionizing radiation causes the formation of free radicals, which results in genetic and other cell damage, resulting in increased rates of illness, including cancer.
[14] Ethanol containing 5% water is known as –
A.
rectified spirit
B.
denatured spirit
C.
methylated alcohol
D.
power alcohol
Ans:
rectified spirit
Explanation :
A rectified spirit, rectified alcohol, or neutral spirit is highly concentrated ethanol which has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume (ABV). Rectified spirits are used in mixed drinks, in the production of liqueurs, for medicinal purposes, and as a household solvent.
[15] The important ore of aluminium is –
A.
bauxite
B.
cryolite
C.
fluorspar
D.
haematite
Ans:
bauxite
Explanation :
Bauxite is an aluminium ore and is the main source of aluminium. This form of rock consists mostly of the minerals gibbsite, boehmite and diaspore, in a mixture with the two iron oxides goethite and hematite, the clay mineral kaolinite, and small amounts of anatase TiO2. Bauxite was named after the village Les Baux in southern France, where it was first recognised as containing aluminium and named by the French geologist Pierre Berthier in 1821. The lateritic bauxites are found mostly in the countries of the tropics. They were formed by lateritization of various silicate rocks such as granite, gneiss, basalt, syenite, and shale. In comparison with the iron-rich laterites, the formation of bauxites demands even more on intense weathering conditions in a location with very good drainage. This enables the dissolution of the kaolinite and the precipitation of the gibbsite. Zones with highest aluminium content are frequently located below a ferruginous surface layer.
[16] Which of the following is not present in German-silver?
A.
Copper
B.
Nickel
C.
Silver
D.
Zinc
Ans:
Silver
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated. The name "German silver" refers to its development by 19th-century German metalworkers in imitation of the Chinese alloy known as paktong.
[17] The major harmful gas emitted by automobile vehicles which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood's ability to carry oxygen: overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[18] Who discovered the atom bomb?
A.
Madam Curie
B.
Pierre Curie
C.
Otto Hahn
D.
Albert Einstein
Ans:
Otto Hahn
Explanation :
Otto Hahn, (8 March, 1879 - 28 July, 1968) was a German chemist and Nobel laureate, a pioneer in the fields of radioactivity and radiochemistry. He is regarded as "the father of nuclear chemistry". On 15 November 1945 the Royal Swedish Academy of Sciences announced that Hahn had been awarded the 1944 Nobel Prize in Chemistry "for his discovery of the fission of heavy atomic nuclei." Otto Hahn received many governmental honours and academic awards from all over the world for his scientific work.
[19] The major component of honey is -
A.
glucose
B.
sucrose
C.
maltose
D.
fructose
Ans:
fructose
Explanation :
Honey is a mixture of sugars and other compounds. With respect to carbohydrates, honey is mainly fructose (about 38.5%) and glucose (about 31.0%), making it similar to the synthetically produced inverted sugar syrup, which is approximately 48% fructose, 47% glucose, and 5% sucrose. Honey's remaining carbohydrates include maltose, sucrose, and other complex carbohydrate.
[20] A body moving in a circular path with a constant speed has a -
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path. A body moving at constant speed in a circular path experiences an acceleration directed towards the centre of the circular path. This acceleration is called a centripetal acceleration and is provided by a centripetal force. Overall, the displacement, velocity and acceleration are vector quantities. They change; but kinetic energy remains constant because the speed is constant.
[21] is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.
A.
Cellulose
B.
Glycogen
C.
Pectin
D.
Chitin
Ans:
Glycogen
Explanation :
Glycogen is a multi branched polysaccharide of glucose that serves as a form of emery storage in humans animals, and fungi.
[22] Potassium Permanganate is used for purifying drinking water, because -
A.
it dissolves the impurities of water
B.
It is a sterilizing agent
C.
It is an oxidising agent
D.
It is a reducing agent
Ans:
It is an oxidising agent
Explanation :
Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
[23] Diamond is harder than graphite because of –
A.
difference in layers of atoms
B.
tetrahedral structure of diamond
C.
difference of crystalline structures
D.
None of these
Ans:
difference in layers of atoms
Explanation :
Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite's structure is very loose, with its bonds forming layers.
[24] Gobar gas contains mainly –
A.
methane
B.
ethylene
C.
propylene
D.
acetylene
Ans:
methane
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood. It also helps in maintaining ecological balance, in rural sanitation and it needs Lower capital cost and almost cost free maintenance.
[25] What is the most commonly used substance in fluorescent tubes?
A.
Sodium oxide and argon
B.
Sodium vapour and neon
C.
Mercury vapour and argon
D.
Mercury oxide and neon
Ans:
Mercury vapour and argon
Explanation :
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and argon. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.
Explanation :
Hydrogenation - to treat with hydrogen - is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst. The process is commonly employed to reduce or saturate organic compounds. The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
[10] The pH of a neutral solution is -
A.
0-7
B.
7
C.
7-14
D.
None of the above
Ans:
7
Explanation :
The pH of a neutral solution is 7. Values less than 7 on the pH scale represent an acidic solution. As the pH value increases from 7 to 14, the solution turns more basic.
[11] The nucleus of an atom consists of -
A.
electrons and neutrons
B.
electrons and protons
C.
protons and neutrons
D.
All of the above
Ans:
protons and neutrons
Explanation :
The atomic nucleus consists of nucleons—protons and neutrons. Protons and neutrons are made of quarks and held together by the strong force generated by gluon exchange between quarks.
[12] Detergents are –
A.
Sodium salts of fatty acids
B.
Sodium salts of sulphonic acids
C.
Sodium salt of benzoic acid
D.
None of the above
Ans:
Sodium salts of sulphonic acids
Explanation :
A detergent is a surfactant or a mixture of surfactants with "cleaning properties in dilute solutiops." These substances are usually alkylbenzenesulfonates, a family of compounds that are similar to soap but are more soluble in hard water, because the polar sulfonate (of detergents) is less likely than the polar carboxyl (of soap) to bind to calcium and other ions found in hard water. In most household contexts, the term detergent by itself refers specifically to laundry detergent or dish detergent, as opposed to hand soap or other types of cleaning agents.
[13] The noble gas used in radiotherapy is –
A.
neon
B.
argon
C.
radon
D.
xenon
Ans:
radon
Explanation :
An early-20th-century form of quackery was the treatment of maladies in a radiotorium. It was a small, sealed room for patients to be exposed to radon for its "medicinal effects". The carcinogenic nature of radon due to its ionizing radiation became apparent later on. Radon's molecule-damaging radioactivity has been used to kill cancerous cells. It does not, however, increase the health of healthy cells. In fact, the ionizing radiation causes the formation of free radicals, which results in genetic and other cell damage, resulting in increased rates of illness, including cancer.
[14] Ethanol containing 5% water is known as –
A.
rectified spirit
B.
denatured spirit
C.
methylated alcohol
D.
power alcohol
Ans:
rectified spirit
Explanation :
A rectified spirit, rectified alcohol, or neutral spirit is highly concentrated ethanol which has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume (ABV). Rectified spirits are used in mixed drinks, in the production of liqueurs, for medicinal purposes, and as a household solvent.
[15] The important ore of aluminium is –
A.
bauxite
B.
cryolite
C.
fluorspar
D.
haematite
Ans:
bauxite
Explanation :
Bauxite is an aluminium ore and is the main source of aluminium. This form of rock consists mostly of the minerals gibbsite, boehmite and diaspore, in a mixture with the two iron oxides goethite and hematite, the clay mineral kaolinite, and small amounts of anatase TiO2. Bauxite was named after the village Les Baux in southern France, where it was first recognised as containing aluminium and named by the French geologist Pierre Berthier in 1821. The lateritic bauxites are found mostly in the countries of the tropics. They were formed by lateritization of various silicate rocks such as granite, gneiss, basalt, syenite, and shale. In comparison with the iron-rich laterites, the formation of bauxites demands even more on intense weathering conditions in a location with very good drainage. This enables the dissolution of the kaolinite and the precipitation of the gibbsite. Zones with highest aluminium content are frequently located below a ferruginous surface layer.
[16] Which of the following is not present in German-silver?
A.
Copper
B.
Nickel
C.
Silver
D.
Zinc
Ans:
Silver
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated. The name "German silver" refers to its development by 19th-century German metalworkers in imitation of the Chinese alloy known as paktong.
[17] The major harmful gas emitted by automobile vehicles which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood's ability to carry oxygen: overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[18] Who discovered the atom bomb?
A.
Madam Curie
B.
Pierre Curie
C.
Otto Hahn
D.
Albert Einstein
Ans:
Otto Hahn
Explanation :
Otto Hahn, (8 March, 1879 - 28 July, 1968) was a German chemist and Nobel laureate, a pioneer in the fields of radioactivity and radiochemistry. He is regarded as "the father of nuclear chemistry". On 15 November 1945 the Royal Swedish Academy of Sciences announced that Hahn had been awarded the 1944 Nobel Prize in Chemistry "for his discovery of the fission of heavy atomic nuclei." Otto Hahn received many governmental honours and academic awards from all over the world for his scientific work.
[19] The major component of honey is -
A.
glucose
B.
sucrose
C.
maltose
D.
fructose
Ans:
fructose
Explanation :
Honey is a mixture of sugars and other compounds. With respect to carbohydrates, honey is mainly fructose (about 38.5%) and glucose (about 31.0%), making it similar to the synthetically produced inverted sugar syrup, which is approximately 48% fructose, 47% glucose, and 5% sucrose. Honey's remaining carbohydrates include maltose, sucrose, and other complex carbohydrate.
[20] A body moving in a circular path with a constant speed has a -
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path. A body moving at constant speed in a circular path experiences an acceleration directed towards the centre of the circular path. This acceleration is called a centripetal acceleration and is provided by a centripetal force. Overall, the displacement, velocity and acceleration are vector quantities. They change; but kinetic energy remains constant because the speed is constant.
[21] is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.
A.
Cellulose
B.
Glycogen
C.
Pectin
D.
Chitin
Ans:
Glycogen
Explanation :
Glycogen is a multi branched polysaccharide of glucose that serves as a form of emery storage in humans animals, and fungi.
[22] Potassium Permanganate is used for purifying drinking water, because -
A.
it dissolves the impurities of water
B.
It is a sterilizing agent
C.
It is an oxidising agent
D.
It is a reducing agent
Ans:
It is an oxidising agent
Explanation :
Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
[23] Diamond is harder than graphite because of –
A.
difference in layers of atoms
B.
tetrahedral structure of diamond
C.
difference of crystalline structures
D.
None of these
Ans:
difference in layers of atoms
Explanation :
Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite's structure is very loose, with its bonds forming layers.
[24] Gobar gas contains mainly –
A.
methane
B.
ethylene
C.
propylene
D.
acetylene
Ans:
methane
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood. It also helps in maintaining ecological balance, in rural sanitation and it needs Lower capital cost and almost cost free maintenance.
[25] What is the most commonly used substance in fluorescent tubes?
A.
Sodium oxide and argon
B.
Sodium vapour and neon
C.
Mercury vapour and argon
D.
Mercury oxide and neon
Ans:
Mercury vapour and argon
Explanation :
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and argon. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.
Explanation :
The atomic nucleus consists of nucleons—protons and neutrons. Protons and neutrons are made of quarks and held together by the strong force generated by gluon exchange between quarks.
[12] Detergents are –
A.
Sodium salts of fatty acids
B.
Sodium salts of sulphonic acids
C.
Sodium salt of benzoic acid
D.
None of the above
Ans:
Sodium salts of sulphonic acids
Explanation :
A detergent is a surfactant or a mixture of surfactants with "cleaning properties in dilute solutiops." These substances are usually alkylbenzenesulfonates, a family of compounds that are similar to soap but are more soluble in hard water, because the polar sulfonate (of detergents) is less likely than the polar carboxyl (of soap) to bind to calcium and other ions found in hard water. In most household contexts, the term detergent by itself refers specifically to laundry detergent or dish detergent, as opposed to hand soap or other types of cleaning agents.
[13] The noble gas used in radiotherapy is –
A.
neon
B.
argon
C.
radon
D.
xenon
Ans:
radon
Explanation :
An early-20th-century form of quackery was the treatment of maladies in a radiotorium. It was a small, sealed room for patients to be exposed to radon for its "medicinal effects". The carcinogenic nature of radon due to its ionizing radiation became apparent later on. Radon's molecule-damaging radioactivity has been used to kill cancerous cells. It does not, however, increase the health of healthy cells. In fact, the ionizing radiation causes the formation of free radicals, which results in genetic and other cell damage, resulting in increased rates of illness, including cancer.
[14] Ethanol containing 5% water is known as –
A.
rectified spirit
B.
denatured spirit
C.
methylated alcohol
D.
power alcohol
Ans:
rectified spirit
Explanation :
A rectified spirit, rectified alcohol, or neutral spirit is highly concentrated ethanol which has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume (ABV). Rectified spirits are used in mixed drinks, in the production of liqueurs, for medicinal purposes, and as a household solvent.
[15] The important ore of aluminium is –
A.
bauxite
B.
cryolite
C.
fluorspar
D.
haematite
Ans:
bauxite
Explanation :
Bauxite is an aluminium ore and is the main source of aluminium. This form of rock consists mostly of the minerals gibbsite, boehmite and diaspore, in a mixture with the two iron oxides goethite and hematite, the clay mineral kaolinite, and small amounts of anatase TiO2. Bauxite was named after the village Les Baux in southern France, where it was first recognised as containing aluminium and named by the French geologist Pierre Berthier in 1821. The lateritic bauxites are found mostly in the countries of the tropics. They were formed by lateritization of various silicate rocks such as granite, gneiss, basalt, syenite, and shale. In comparison with the iron-rich laterites, the formation of bauxites demands even more on intense weathering conditions in a location with very good drainage. This enables the dissolution of the kaolinite and the precipitation of the gibbsite. Zones with highest aluminium content are frequently located below a ferruginous surface layer.
[16] Which of the following is not present in German-silver?
A.
Copper
B.
Nickel
C.
Silver
D.
Zinc
Ans:
Silver
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated. The name "German silver" refers to its development by 19th-century German metalworkers in imitation of the Chinese alloy known as paktong.
[17] The major harmful gas emitted by automobile vehicles which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood's ability to carry oxygen: overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[18] Who discovered the atom bomb?
A.
Madam Curie
B.
Pierre Curie
C.
Otto Hahn
D.
Albert Einstein
Ans:
Otto Hahn
Explanation :
Otto Hahn, (8 March, 1879 - 28 July, 1968) was a German chemist and Nobel laureate, a pioneer in the fields of radioactivity and radiochemistry. He is regarded as "the father of nuclear chemistry". On 15 November 1945 the Royal Swedish Academy of Sciences announced that Hahn had been awarded the 1944 Nobel Prize in Chemistry "for his discovery of the fission of heavy atomic nuclei." Otto Hahn received many governmental honours and academic awards from all over the world for his scientific work.
[19] The major component of honey is -
A.
glucose
B.
sucrose
C.
maltose
D.
fructose
Ans:
fructose
Explanation :
Honey is a mixture of sugars and other compounds. With respect to carbohydrates, honey is mainly fructose (about 38.5%) and glucose (about 31.0%), making it similar to the synthetically produced inverted sugar syrup, which is approximately 48% fructose, 47% glucose, and 5% sucrose. Honey's remaining carbohydrates include maltose, sucrose, and other complex carbohydrate.
[20] A body moving in a circular path with a constant speed has a -
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path. A body moving at constant speed in a circular path experiences an acceleration directed towards the centre of the circular path. This acceleration is called a centripetal acceleration and is provided by a centripetal force. Overall, the displacement, velocity and acceleration are vector quantities. They change; but kinetic energy remains constant because the speed is constant.
[21] is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.
A.
Cellulose
B.
Glycogen
C.
Pectin
D.
Chitin
Ans:
Glycogen
Explanation :
Glycogen is a multi branched polysaccharide of glucose that serves as a form of emery storage in humans animals, and fungi.
[22] Potassium Permanganate is used for purifying drinking water, because -
A.
it dissolves the impurities of water
B.
It is a sterilizing agent
C.
It is an oxidising agent
D.
It is a reducing agent
Ans:
It is an oxidising agent
Explanation :
Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
[23] Diamond is harder than graphite because of –
A.
difference in layers of atoms
B.
tetrahedral structure of diamond
C.
difference of crystalline structures
D.
None of these
Ans:
difference in layers of atoms
Explanation :
Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite's structure is very loose, with its bonds forming layers.
[24] Gobar gas contains mainly –
A.
methane
B.
ethylene
C.
propylene
D.
acetylene
Ans:
methane
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood. It also helps in maintaining ecological balance, in rural sanitation and it needs Lower capital cost and almost cost free maintenance.
[25] What is the most commonly used substance in fluorescent tubes?
A.
Sodium oxide and argon
B.
Sodium vapour and neon
C.
Mercury vapour and argon
D.
Mercury oxide and neon
Ans:
Mercury vapour and argon
Explanation :
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and argon. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.
Explanation :
An early-20th-century form of quackery was the treatment of maladies in a radiotorium. It was a small, sealed room for patients to be exposed to radon for its "medicinal effects". The carcinogenic nature of radon due to its ionizing radiation became apparent later on. Radon's molecule-damaging radioactivity has been used to kill cancerous cells. It does not, however, increase the health of healthy cells. In fact, the ionizing radiation causes the formation of free radicals, which results in genetic and other cell damage, resulting in increased rates of illness, including cancer.
[14] Ethanol containing 5% water is known as –
A.
rectified spirit
B.
denatured spirit
C.
methylated alcohol
D.
power alcohol
Ans:
rectified spirit
Explanation :
A rectified spirit, rectified alcohol, or neutral spirit is highly concentrated ethanol which has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume (ABV). Rectified spirits are used in mixed drinks, in the production of liqueurs, for medicinal purposes, and as a household solvent.
[15] The important ore of aluminium is –
A.
bauxite
B.
cryolite
C.
fluorspar
D.
haematite
Ans:
bauxite
Explanation :
Bauxite is an aluminium ore and is the main source of aluminium. This form of rock consists mostly of the minerals gibbsite, boehmite and diaspore, in a mixture with the two iron oxides goethite and hematite, the clay mineral kaolinite, and small amounts of anatase TiO2. Bauxite was named after the village Les Baux in southern France, where it was first recognised as containing aluminium and named by the French geologist Pierre Berthier in 1821. The lateritic bauxites are found mostly in the countries of the tropics. They were formed by lateritization of various silicate rocks such as granite, gneiss, basalt, syenite, and shale. In comparison with the iron-rich laterites, the formation of bauxites demands even more on intense weathering conditions in a location with very good drainage. This enables the dissolution of the kaolinite and the precipitation of the gibbsite. Zones with highest aluminium content are frequently located below a ferruginous surface layer.
[16] Which of the following is not present in German-silver?
A.
Copper
B.
Nickel
C.
Silver
D.
Zinc
Ans:
Silver
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated. The name "German silver" refers to its development by 19th-century German metalworkers in imitation of the Chinese alloy known as paktong.
[17] The major harmful gas emitted by automobile vehicles which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood's ability to carry oxygen: overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[18] Who discovered the atom bomb?
A.
Madam Curie
B.
Pierre Curie
C.
Otto Hahn
D.
Albert Einstein
Ans:
Otto Hahn
Explanation :
Otto Hahn, (8 March, 1879 - 28 July, 1968) was a German chemist and Nobel laureate, a pioneer in the fields of radioactivity and radiochemistry. He is regarded as "the father of nuclear chemistry". On 15 November 1945 the Royal Swedish Academy of Sciences announced that Hahn had been awarded the 1944 Nobel Prize in Chemistry "for his discovery of the fission of heavy atomic nuclei." Otto Hahn received many governmental honours and academic awards from all over the world for his scientific work.
[19] The major component of honey is -
A.
glucose
B.
sucrose
C.
maltose
D.
fructose
Ans:
fructose
Explanation :
Honey is a mixture of sugars and other compounds. With respect to carbohydrates, honey is mainly fructose (about 38.5%) and glucose (about 31.0%), making it similar to the synthetically produced inverted sugar syrup, which is approximately 48% fructose, 47% glucose, and 5% sucrose. Honey's remaining carbohydrates include maltose, sucrose, and other complex carbohydrate.
[20] A body moving in a circular path with a constant speed has a -
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path. A body moving at constant speed in a circular path experiences an acceleration directed towards the centre of the circular path. This acceleration is called a centripetal acceleration and is provided by a centripetal force. Overall, the displacement, velocity and acceleration are vector quantities. They change; but kinetic energy remains constant because the speed is constant.
[21] is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.
A.
Cellulose
B.
Glycogen
C.
Pectin
D.
Chitin
Ans:
Glycogen
Explanation :
Glycogen is a multi branched polysaccharide of glucose that serves as a form of emery storage in humans animals, and fungi.
[22] Potassium Permanganate is used for purifying drinking water, because -
A.
it dissolves the impurities of water
B.
It is a sterilizing agent
C.
It is an oxidising agent
D.
It is a reducing agent
Ans:
It is an oxidising agent
Explanation :
Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
[23] Diamond is harder than graphite because of –
A.
difference in layers of atoms
B.
tetrahedral structure of diamond
C.
difference of crystalline structures
D.
None of these
Ans:
difference in layers of atoms
Explanation :
Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite's structure is very loose, with its bonds forming layers.
[24] Gobar gas contains mainly –
A.
methane
B.
ethylene
C.
propylene
D.
acetylene
Ans:
methane
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood. It also helps in maintaining ecological balance, in rural sanitation and it needs Lower capital cost and almost cost free maintenance.
[25] What is the most commonly used substance in fluorescent tubes?
A.
Sodium oxide and argon
B.
Sodium vapour and neon
C.
Mercury vapour and argon
D.
Mercury oxide and neon
Ans:
Mercury vapour and argon
Explanation :
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and argon. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.
Explanation :
Bauxite is an aluminium ore and is the main source of aluminium. This form of rock consists mostly of the minerals gibbsite, boehmite and diaspore, in a mixture with the two iron oxides goethite and hematite, the clay mineral kaolinite, and small amounts of anatase TiO2. Bauxite was named after the village Les Baux in southern France, where it was first recognised as containing aluminium and named by the French geologist Pierre Berthier in 1821. The lateritic bauxites are found mostly in the countries of the tropics. They were formed by lateritization of various silicate rocks such as granite, gneiss, basalt, syenite, and shale. In comparison with the iron-rich laterites, the formation of bauxites demands even more on intense weathering conditions in a location with very good drainage. This enables the dissolution of the kaolinite and the precipitation of the gibbsite. Zones with highest aluminium content are frequently located below a ferruginous surface layer.
[16] Which of the following is not present in German-silver?
A.
Copper
B.
Nickel
C.
Silver
D.
Zinc
Ans:
Silver
Explanation :
Nickel silver, also known as German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated. The name "German silver" refers to its development by 19th-century German metalworkers in imitation of the Chinese alloy known as paktong.
[17] The major harmful gas emitted by automobile vehicles which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood's ability to carry oxygen: overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[18] Who discovered the atom bomb?
A.
Madam Curie
B.
Pierre Curie
C.
Otto Hahn
D.
Albert Einstein
Ans:
Otto Hahn
Explanation :
Otto Hahn, (8 March, 1879 - 28 July, 1968) was a German chemist and Nobel laureate, a pioneer in the fields of radioactivity and radiochemistry. He is regarded as "the father of nuclear chemistry". On 15 November 1945 the Royal Swedish Academy of Sciences announced that Hahn had been awarded the 1944 Nobel Prize in Chemistry "for his discovery of the fission of heavy atomic nuclei." Otto Hahn received many governmental honours and academic awards from all over the world for his scientific work.
[19] The major component of honey is -
A.
glucose
B.
sucrose
C.
maltose
D.
fructose
Ans:
fructose
Explanation :
Honey is a mixture of sugars and other compounds. With respect to carbohydrates, honey is mainly fructose (about 38.5%) and glucose (about 31.0%), making it similar to the synthetically produced inverted sugar syrup, which is approximately 48% fructose, 47% glucose, and 5% sucrose. Honey's remaining carbohydrates include maltose, sucrose, and other complex carbohydrate.
[20] A body moving in a circular path with a constant speed has a -
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path. A body moving at constant speed in a circular path experiences an acceleration directed towards the centre of the circular path. This acceleration is called a centripetal acceleration and is provided by a centripetal force. Overall, the displacement, velocity and acceleration are vector quantities. They change; but kinetic energy remains constant because the speed is constant.
[21] is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.
A.
Cellulose
B.
Glycogen
C.
Pectin
D.
Chitin
Ans:
Glycogen
Explanation :
Glycogen is a multi branched polysaccharide of glucose that serves as a form of emery storage in humans animals, and fungi.
[22] Potassium Permanganate is used for purifying drinking water, because -
A.
it dissolves the impurities of water
B.
It is a sterilizing agent
C.
It is an oxidising agent
D.
It is a reducing agent
Ans:
It is an oxidising agent
Explanation :
Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
[23] Diamond is harder than graphite because of –
A.
difference in layers of atoms
B.
tetrahedral structure of diamond
C.
difference of crystalline structures
D.
None of these
Ans:
difference in layers of atoms
Explanation :
Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite's structure is very loose, with its bonds forming layers.
[24] Gobar gas contains mainly –
A.
methane
B.
ethylene
C.
propylene
D.
acetylene
Ans:
methane
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood. It also helps in maintaining ecological balance, in rural sanitation and it needs Lower capital cost and almost cost free maintenance.
[25] What is the most commonly used substance in fluorescent tubes?
A.
Sodium oxide and argon
B.
Sodium vapour and neon
C.
Mercury vapour and argon
D.
Mercury oxide and neon
Ans:
Mercury vapour and argon
Explanation :
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and argon. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood's ability to carry oxygen: overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[18] Who discovered the atom bomb?
A.
Madam Curie
B.
Pierre Curie
C.
Otto Hahn
D.
Albert Einstein
Ans:
Otto Hahn
Explanation :
Otto Hahn, (8 March, 1879 - 28 July, 1968) was a German chemist and Nobel laureate, a pioneer in the fields of radioactivity and radiochemistry. He is regarded as "the father of nuclear chemistry". On 15 November 1945 the Royal Swedish Academy of Sciences announced that Hahn had been awarded the 1944 Nobel Prize in Chemistry "for his discovery of the fission of heavy atomic nuclei." Otto Hahn received many governmental honours and academic awards from all over the world for his scientific work.
[19] The major component of honey is -
A.
glucose
B.
sucrose
C.
maltose
D.
fructose
Ans:
fructose
Explanation :
Honey is a mixture of sugars and other compounds. With respect to carbohydrates, honey is mainly fructose (about 38.5%) and glucose (about 31.0%), making it similar to the synthetically produced inverted sugar syrup, which is approximately 48% fructose, 47% glucose, and 5% sucrose. Honey's remaining carbohydrates include maltose, sucrose, and other complex carbohydrate.
[20] A body moving in a circular path with a constant speed has a -
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path. A body moving at constant speed in a circular path experiences an acceleration directed towards the centre of the circular path. This acceleration is called a centripetal acceleration and is provided by a centripetal force. Overall, the displacement, velocity and acceleration are vector quantities. They change; but kinetic energy remains constant because the speed is constant.
[21] is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.
A.
Cellulose
B.
Glycogen
C.
Pectin
D.
Chitin
Ans:
Glycogen
Explanation :
Glycogen is a multi branched polysaccharide of glucose that serves as a form of emery storage in humans animals, and fungi.
[22] Potassium Permanganate is used for purifying drinking water, because -
A.
it dissolves the impurities of water
B.
It is a sterilizing agent
C.
It is an oxidising agent
D.
It is a reducing agent
Ans:
It is an oxidising agent
Explanation :
Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
[23] Diamond is harder than graphite because of –
A.
difference in layers of atoms
B.
tetrahedral structure of diamond
C.
difference of crystalline structures
D.
None of these
Ans:
difference in layers of atoms
Explanation :
Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite's structure is very loose, with its bonds forming layers.
[24] Gobar gas contains mainly –
A.
methane
B.
ethylene
C.
propylene
D.
acetylene
Ans:
methane
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood. It also helps in maintaining ecological balance, in rural sanitation and it needs Lower capital cost and almost cost free maintenance.
[25] What is the most commonly used substance in fluorescent tubes?
A.
Sodium oxide and argon
B.
Sodium vapour and neon
C.
Mercury vapour and argon
D.
Mercury oxide and neon
Ans:
Mercury vapour and argon
Explanation :
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and argon. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.
Explanation :
Honey is a mixture of sugars and other compounds. With respect to carbohydrates, honey is mainly fructose (about 38.5%) and glucose (about 31.0%), making it similar to the synthetically produced inverted sugar syrup, which is approximately 48% fructose, 47% glucose, and 5% sucrose. Honey's remaining carbohydrates include maltose, sucrose, and other complex carbohydrate.
[20] A body moving in a circular path with a constant speed has a -
A.
constant velocity
B.
constant acceleration
C.
constant kinetic energy
D.
constant displacement
Ans:
constant kinetic energy
Explanation :
In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the velocity is changing. This means that body moving in a circular is accelerating. At any instant, the direction of the velocity is a tangent to the circular path. A body moving at constant speed in a circular path experiences an acceleration directed towards the centre of the circular path. This acceleration is called a centripetal acceleration and is provided by a centripetal force. Overall, the displacement, velocity and acceleration are vector quantities. They change; but kinetic energy remains constant because the speed is constant.
[21] is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.
A.
Cellulose
B.
Glycogen
C.
Pectin
D.
Chitin
Ans:
Glycogen
Explanation :
Glycogen is a multi branched polysaccharide of glucose that serves as a form of emery storage in humans animals, and fungi.
[22] Potassium Permanganate is used for purifying drinking water, because -
A.
it dissolves the impurities of water
B.
It is a sterilizing agent
C.
It is an oxidising agent
D.
It is a reducing agent
Ans:
It is an oxidising agent
Explanation :
Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
[23] Diamond is harder than graphite because of –
A.
difference in layers of atoms
B.
tetrahedral structure of diamond
C.
difference of crystalline structures
D.
None of these
Ans:
difference in layers of atoms
Explanation :
Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite's structure is very loose, with its bonds forming layers.
[24] Gobar gas contains mainly –
A.
methane
B.
ethylene
C.
propylene
D.
acetylene
Ans:
methane
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood. It also helps in maintaining ecological balance, in rural sanitation and it needs Lower capital cost and almost cost free maintenance.
[25] What is the most commonly used substance in fluorescent tubes?
A.
Sodium oxide and argon
B.
Sodium vapour and neon
C.
Mercury vapour and argon
D.
Mercury oxide and neon
Ans:
Mercury vapour and argon
Explanation :
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and argon. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.
Explanation :
Glycogen is a multi branched polysaccharide of glucose that serves as a form of emery storage in humans animals, and fungi.
[22] Potassium Permanganate is used for purifying drinking water, because -
A.
it dissolves the impurities of water
B.
It is a sterilizing agent
C.
It is an oxidising agent
D.
It is a reducing agent
Ans:
It is an oxidising agent
Explanation :
Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
[23] Diamond is harder than graphite because of –
A.
difference in layers of atoms
B.
tetrahedral structure of diamond
C.
difference of crystalline structures
D.
None of these
Ans:
difference in layers of atoms
Explanation :
Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite's structure is very loose, with its bonds forming layers.
[24] Gobar gas contains mainly –
A.
methane
B.
ethylene
C.
propylene
D.
acetylene
Ans:
methane
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood. It also helps in maintaining ecological balance, in rural sanitation and it needs Lower capital cost and almost cost free maintenance.
[25] What is the most commonly used substance in fluorescent tubes?
A.
Sodium oxide and argon
B.
Sodium vapour and neon
C.
Mercury vapour and argon
D.
Mercury oxide and neon
Ans:
Mercury vapour and argon
Explanation :
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and argon. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.
Explanation :
Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite's structure is very loose, with its bonds forming layers.
[24] Gobar gas contains mainly –
A.
methane
B.
ethylene
C.
propylene
D.
acetylene
Ans:
methane
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood. It also helps in maintaining ecological balance, in rural sanitation and it needs Lower capital cost and almost cost free maintenance.
[25] What is the most commonly used substance in fluorescent tubes?
A.
Sodium oxide and argon
B.
Sodium vapour and neon
C.
Mercury vapour and argon
D.
Mercury oxide and neon
Ans:
Mercury vapour and argon
Explanation :
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and argon. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.
Explanation :
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and argon. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.