[1] When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is -
A.
Hydrogen
B.
Oxygen
C.
Carbon dioxide
D.
All of them
Ans:
Carbon dioxide
Explanation :
When baking soda and lemon juice are added together, the reaction of the two is an acid-based reaction because it involves an acid (citric acid in the lemon juice) reacting with a base (sodium bicarbonate, more commonly known as baking soda). Carbon dioxide, a gas, is produced by the reaction.
[2] Which one of the following elements is least likely to be found in commercial fertilizers?
A.
Nitrogen
B.
Phosphorous
C.
Potassium
D.
Silicon
Ans:
Silicon
Explanation :
Fertilizers typically provide, in varying proportions: (1) six macronutrients: nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), and sulfur (S); and (ii) eight micronutrients: boron (B), chlorine (Cl), copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo), zinc (Zn) and nickel {Ni}.
[3] In the electroplating of gold, the electrolyte used is –
A.
Gold chloride
B.
Gold nitrate
C.
Gold sulphate
D.
Potassium aurocyanide
Ans:
Gold sulphate
Explanation :
Gold plating is a method of depositing a thin layer of gold onto the surface of another metal, most often copper or silver (to make silver-gilt), by chemical or electrochemical plating. Electroplating of gold is done using a sulphate/sulfite based electrolyte. This product is environment and user friendly and moreover the electroplating rate is good.
[4] The basic chemical building block of natural rubber obtained from trees is –
A.
Isoprene
B.
Vinyl Chloride
C.
Acetylene
D.
Neoprene
Ans:
Isoprene
Explanation :
Isoprene was first isolated by thermal decomposition of natural rubber. About 95% of isoprene production is used to produce cis-1,4-polyisoprene---a synthetic version of natural rubber. Natural rubber consists mainly of poly-cis-isoprene with a molecular weight of 100,000 to 1,000,000.
[5] The name of plastic polymer from which combs, toys, bowls etc., can be made, is –
A.
Polyurethane
B.
Polystyrene
C.
Metallic polysulphides
D.
Teflon
Ans:
Polystyrene
Explanation :
Polystyrene is an synthetic aromatic polymer made from the monomer styrene, a liquid petrochemical. It is one of the most widely used plastics. Uses include protective packaging (such as packing peanuts and CD and DVD cases), containers (such as "clamshells"), lids, bottles, trays, tumblers, and disposable cutlery.
[6] 'Red Ink' is prepared from -
A.
Phenol
B.
Aniline
C.
Congo redd
D.
Eosin
Ans:
Eosin
Explanation :
Eosin is a dye used to prepare red ink. Eosin Y is a xanthene dye and is used for the differential staining of connective tissue and cytoplasm.
[7] Gas released during Bhopal tragedy was -
A.
Sodium isothiocyanate
B.
Ethyl isothiocyanate
C.
Potassium isothiocyanate
D.
Methyl isothiocyanate
Ans:
Methyl isothiocyanate
Explanation :
The Bhopal disaster or Bhopal gas tragedy was an industrial accident. It happened at a Union Carbide subsidiary pesticide plant in the city of Bhopal, India. On the night of 2-3 December 1984, the plant released 42 tonnes of toxic Methyl Isocyanate (MIC) gas, exposing more than 500,000 people to toxic gases.
[8] Oil of vitriol is -
A.
nitric acid
B.
sulfuric acid
C.
hydrochloric acid
D.
phosphoric acid
Ans:
sulfuric acid
Explanation :
Sulfuric acid or H2SO4 was called “oil of vitriol” by medieval European alchemists because it was prepared by roasting “green vitriol” in an iron retort.
[9] Hydrogen was discovered by -
A.
Cavendish
B.
Lavosier
C.
Rutherford
D.
Scheele
Ans:
Cavendish
Explanation :
In 1766, Henry Cavendish was the first to recognize hydrogen gas as a discrete substance, by naming the gas from a metal-acid reaction "flammable air".
[10] Glass is a –
A.
pure solid
B.
supercooled liquid
C.
gel
D.
polymer
Ans:
supercooled liquid
Explanation :
Glass is an amorphous (non-crystalline) solid material. Glasses are typically brittle and optically transparent. The standard definition of a glass (or vitreous solid) is a solid formed by rapid melt quenching. However, the term glass is often used to describe any amorphous solid that exhibits a glass transition temperature Tg.
[11] Uranium eventually decays into a stable isotope of —
A.
Radium
B.
Thorium
C.
Lead
D.
Polonium
Ans:
Lead
Explanation :
Natural uranium consists of three major isotopes: U238 (99.28% natural abundance), U235 (0.71%), and U234 (0.0054%). All three are radioactive, emitting alpha particles, with the exception that all three of these isotopes have small probabilities of undergoing spontaneous fission, rather than alpha emission. U23° is usually an alpha emitter (occasionally, it undergoes spontaneous fission), decaying through the Uranium Series of nuclear decay, which has 18 members, all of which eventually decay into Pb206, by a variety of different decay paths.
[12] The substance that is added to make natural rubber strong and more bouncy is –
A.
Polythene
B.
Sponge
C.
Sulphur
D.
Chlorine
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties.
[13] White phosphorus is always kept under –
A.
benzene
B.
kerosene
C.
ether
D.
water
Ans:
water
Explanation :
White phosphorus is a material made from a common allotrope of the chemical element phosphorus that is used in smoke, tracer, illumination and incendiary munitions. Other common names include WP, and the slang term "Willie Pete," which is dated from its use in Vietnam, and is still sometimes used in military jargon. As an incendiary weapon, white phosphorus burns fiercely and can set cloth, fuel, ammunition and other combustibles on fire, and cause serious burns or death and that is why it is kept in water.
[14] The amount of Chlorine available in water after disinfection is called as –
A.
free chlorine
B.
residual chlorine
C.
free available chlorine
D.
combined available chlorine
Ans:
residual chlorine
Explanation :
The word "residual" means "remainder" or "that which is left", and as the name suggests the chlorine residual is measure of the amount of chlorine remaining in the water after disinfection. The chlorine residual is usually tested in finished water which is ready to be released into the distribution system, although operators must also ensure that there is adequate residual at the extreme ends of the distribution system. Tests for chlorine residual are probably the most frequently performed tests at water treatment plants.
[15] What are the major pollutants of cigarette smoke?
A.
Carbon monoxide and dioxin
B.
Carbon monoxide and nicotine
C.
Carbon monoxide and benzene
D.
Dioxin and benzene
Ans:
Carbon monoxide and nicotine
Explanation :
Particulate matter consists of millions of tiny particles of diverse chemical composition. Particulate matter from tobacco smoke includes many particles in the size range that reflects light, which explains why tobacco smoke is easily seen by the eye. In contrast to smoke particles, gases emitted by the cigarette such as benzene and carbon monoxide (CO) are invisible to the eye. Particles smaller than 2.5 micrometers (PM2.5) are major components of cigarette smoke and can enter deep into the lung where they can cause serious health problems.
[16] The chemical name of 'Common salt' is –
A.
Sodium chloride
B.
Sodium nitrate
C.
Ammonium chloride
D.
Calcium chloride
Ans:
Sodium chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the formula NaCl, representing equal proportions of sodium and chloride. Sodium chloride is the salt most responsible for the salinity of the ocean and of the extracellular fluid of many multicellular organisms. As the major ingredient in edible salt, it is commonly used as a condiment and food preservative. In solid sodium chloride, each ion is surrounded by six ions of, the opposite charge as expected on electrostatic grounds.
[17] By-product obtained by soap industry is –
A.
Caustic soda
B.
Glycerol
C.
Naphthalene
D.
Caustic potash
Ans:
Glycerol
Explanation :
Glycerol forms the backbone of triglyeerides, and is chiefly produced by saponification of fats as a byproduct of soap-making. It is also a byproduct of the production of biodiesel via transesterification. This form of crude glycerin is often dark in appearance with a thick, syrup-like consistency.
[18] Polythene is polymer of –
A.
Ethylene
B.
Propylene
C.
Acetylene
D.
Aniline
Ans:
Ethylene
Explanation :
The ingredient or monomer is ethylene (IUPAC name ethene). It has the formula C2H4, consisting of a pair of CH2 groups connected by a double bond. Because the catalysts are highly reactive, the ethylene must be of high purity. Typical specifications are <5 ppm for water, oxygen, as well as other alkenes. Acceptable contaminants include N2, ethane (common precursor to ethylene), and methane. Ethylene is usually produced from petrochemical sources, but also is generated by dehydration of ethanol.
[19] Which one is not micronutrient?
A.
Iron
B.
Zinc
C.
Sulphur
D.
Manganese
Ans:
Sulphur
Explanation :
Here's a list of important micronutrients and common foods where they can be found: Calcium - milk, yogurt, spinach, and sardines. Vitamin B12 - beef, fish, cheese, and eggs. Zinc - beef, cashews, garbanzo beans, and turkey.
[20] Who suggested that the most of the mass of atom is located in nucleus?
A.
Bohr
B.
Thomson
C.
Rutherford
D.
Avogadro
Ans:
Rutherford
Explanation :
The atom, as described by Ernest Rutherford, has a tiny, massive core called the nucleus. The nucleus has a positive charge.
[21] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[22] Which one of the following is a cation?
A.
Carbonate
B.
Nitrite
C.
Ammonium
D.
Hydroxide
Ans:
Ammonium
Explanation :
The ammonium cation is a positively charged polyatomic cation with the chemical formula NH4+.
[23] Ginger is an example of -
A.
Modified Node
B.
Modified Root
C.
Modified Stem
D.
Tap Root
Ans:
Modified Stem
Explanation :
Modified stems that grow above ground: Stolons or runners-are horizontally oriented stems that grow along the soil surface.
[24] The ore which is found in abundance in India is -
A.
monazite
B.
bauxite
C.
magnetite
D.
fluorspar
Ans:
monazite
Explanation :
The ore monazite is found in abundance in India.
[25] Baryllium Sulphate is less soluble in water due to –
A.
High inflammable energy
B.
Low Energy of dissociation
C.
Low inflammable energy
D.
Lonic band
Ans:
High inflammable energy
Explanation :
Beryllium sulfate (BeSO4) is a white crystalline e solid. It was first isolated in 1815 by Jons Jakob Berzelelu Beryllium sulfate may be prepared by treatingasne aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Beryllium Sulphate is less soluble in water due to High inflammable energy.
Explanation :
When baking soda and lemon juice are added together, the reaction of the two is an acid-based reaction because it involves an acid (citric acid in the lemon juice) reacting with a base (sodium bicarbonate, more commonly known as baking soda). Carbon dioxide, a gas, is produced by the reaction.
[2] Which one of the following elements is least likely to be found in commercial fertilizers?
A.
Nitrogen
B.
Phosphorous
C.
Potassium
D.
Silicon
Ans:
Silicon
Explanation :
Fertilizers typically provide, in varying proportions: (1) six macronutrients: nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), and sulfur (S); and (ii) eight micronutrients: boron (B), chlorine (Cl), copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo), zinc (Zn) and nickel {Ni}.
[3] In the electroplating of gold, the electrolyte used is –
A.
Gold chloride
B.
Gold nitrate
C.
Gold sulphate
D.
Potassium aurocyanide
Ans:
Gold sulphate
Explanation :
Gold plating is a method of depositing a thin layer of gold onto the surface of another metal, most often copper or silver (to make silver-gilt), by chemical or electrochemical plating. Electroplating of gold is done using a sulphate/sulfite based electrolyte. This product is environment and user friendly and moreover the electroplating rate is good.
[4] The basic chemical building block of natural rubber obtained from trees is –
A.
Isoprene
B.
Vinyl Chloride
C.
Acetylene
D.
Neoprene
Ans:
Isoprene
Explanation :
Isoprene was first isolated by thermal decomposition of natural rubber. About 95% of isoprene production is used to produce cis-1,4-polyisoprene---a synthetic version of natural rubber. Natural rubber consists mainly of poly-cis-isoprene with a molecular weight of 100,000 to 1,000,000.
[5] The name of plastic polymer from which combs, toys, bowls etc., can be made, is –
A.
Polyurethane
B.
Polystyrene
C.
Metallic polysulphides
D.
Teflon
Ans:
Polystyrene
Explanation :
Polystyrene is an synthetic aromatic polymer made from the monomer styrene, a liquid petrochemical. It is one of the most widely used plastics. Uses include protective packaging (such as packing peanuts and CD and DVD cases), containers (such as "clamshells"), lids, bottles, trays, tumblers, and disposable cutlery.
[6] 'Red Ink' is prepared from -
A.
Phenol
B.
Aniline
C.
Congo redd
D.
Eosin
Ans:
Eosin
Explanation :
Eosin is a dye used to prepare red ink. Eosin Y is a xanthene dye and is used for the differential staining of connective tissue and cytoplasm.
[7] Gas released during Bhopal tragedy was -
A.
Sodium isothiocyanate
B.
Ethyl isothiocyanate
C.
Potassium isothiocyanate
D.
Methyl isothiocyanate
Ans:
Methyl isothiocyanate
Explanation :
The Bhopal disaster or Bhopal gas tragedy was an industrial accident. It happened at a Union Carbide subsidiary pesticide plant in the city of Bhopal, India. On the night of 2-3 December 1984, the plant released 42 tonnes of toxic Methyl Isocyanate (MIC) gas, exposing more than 500,000 people to toxic gases.
[8] Oil of vitriol is -
A.
nitric acid
B.
sulfuric acid
C.
hydrochloric acid
D.
phosphoric acid
Ans:
sulfuric acid
Explanation :
Sulfuric acid or H2SO4 was called “oil of vitriol” by medieval European alchemists because it was prepared by roasting “green vitriol” in an iron retort.
[9] Hydrogen was discovered by -
A.
Cavendish
B.
Lavosier
C.
Rutherford
D.
Scheele
Ans:
Cavendish
Explanation :
In 1766, Henry Cavendish was the first to recognize hydrogen gas as a discrete substance, by naming the gas from a metal-acid reaction "flammable air".
[10] Glass is a –
A.
pure solid
B.
supercooled liquid
C.
gel
D.
polymer
Ans:
supercooled liquid
Explanation :
Glass is an amorphous (non-crystalline) solid material. Glasses are typically brittle and optically transparent. The standard definition of a glass (or vitreous solid) is a solid formed by rapid melt quenching. However, the term glass is often used to describe any amorphous solid that exhibits a glass transition temperature Tg.
[11] Uranium eventually decays into a stable isotope of —
A.
Radium
B.
Thorium
C.
Lead
D.
Polonium
Ans:
Lead
Explanation :
Natural uranium consists of three major isotopes: U238 (99.28% natural abundance), U235 (0.71%), and U234 (0.0054%). All three are radioactive, emitting alpha particles, with the exception that all three of these isotopes have small probabilities of undergoing spontaneous fission, rather than alpha emission. U23° is usually an alpha emitter (occasionally, it undergoes spontaneous fission), decaying through the Uranium Series of nuclear decay, which has 18 members, all of which eventually decay into Pb206, by a variety of different decay paths.
[12] The substance that is added to make natural rubber strong and more bouncy is –
A.
Polythene
B.
Sponge
C.
Sulphur
D.
Chlorine
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties.
[13] White phosphorus is always kept under –
A.
benzene
B.
kerosene
C.
ether
D.
water
Ans:
water
Explanation :
White phosphorus is a material made from a common allotrope of the chemical element phosphorus that is used in smoke, tracer, illumination and incendiary munitions. Other common names include WP, and the slang term "Willie Pete," which is dated from its use in Vietnam, and is still sometimes used in military jargon. As an incendiary weapon, white phosphorus burns fiercely and can set cloth, fuel, ammunition and other combustibles on fire, and cause serious burns or death and that is why it is kept in water.
[14] The amount of Chlorine available in water after disinfection is called as –
A.
free chlorine
B.
residual chlorine
C.
free available chlorine
D.
combined available chlorine
Ans:
residual chlorine
Explanation :
The word "residual" means "remainder" or "that which is left", and as the name suggests the chlorine residual is measure of the amount of chlorine remaining in the water after disinfection. The chlorine residual is usually tested in finished water which is ready to be released into the distribution system, although operators must also ensure that there is adequate residual at the extreme ends of the distribution system. Tests for chlorine residual are probably the most frequently performed tests at water treatment plants.
[15] What are the major pollutants of cigarette smoke?
A.
Carbon monoxide and dioxin
B.
Carbon monoxide and nicotine
C.
Carbon monoxide and benzene
D.
Dioxin and benzene
Ans:
Carbon monoxide and nicotine
Explanation :
Particulate matter consists of millions of tiny particles of diverse chemical composition. Particulate matter from tobacco smoke includes many particles in the size range that reflects light, which explains why tobacco smoke is easily seen by the eye. In contrast to smoke particles, gases emitted by the cigarette such as benzene and carbon monoxide (CO) are invisible to the eye. Particles smaller than 2.5 micrometers (PM2.5) are major components of cigarette smoke and can enter deep into the lung where they can cause serious health problems.
[16] The chemical name of 'Common salt' is –
A.
Sodium chloride
B.
Sodium nitrate
C.
Ammonium chloride
D.
Calcium chloride
Ans:
Sodium chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the formula NaCl, representing equal proportions of sodium and chloride. Sodium chloride is the salt most responsible for the salinity of the ocean and of the extracellular fluid of many multicellular organisms. As the major ingredient in edible salt, it is commonly used as a condiment and food preservative. In solid sodium chloride, each ion is surrounded by six ions of, the opposite charge as expected on electrostatic grounds.
[17] By-product obtained by soap industry is –
A.
Caustic soda
B.
Glycerol
C.
Naphthalene
D.
Caustic potash
Ans:
Glycerol
Explanation :
Glycerol forms the backbone of triglyeerides, and is chiefly produced by saponification of fats as a byproduct of soap-making. It is also a byproduct of the production of biodiesel via transesterification. This form of crude glycerin is often dark in appearance with a thick, syrup-like consistency.
[18] Polythene is polymer of –
A.
Ethylene
B.
Propylene
C.
Acetylene
D.
Aniline
Ans:
Ethylene
Explanation :
The ingredient or monomer is ethylene (IUPAC name ethene). It has the formula C2H4, consisting of a pair of CH2 groups connected by a double bond. Because the catalysts are highly reactive, the ethylene must be of high purity. Typical specifications are <5 ppm for water, oxygen, as well as other alkenes. Acceptable contaminants include N2, ethane (common precursor to ethylene), and methane. Ethylene is usually produced from petrochemical sources, but also is generated by dehydration of ethanol.
[19] Which one is not micronutrient?
A.
Iron
B.
Zinc
C.
Sulphur
D.
Manganese
Ans:
Sulphur
Explanation :
Here's a list of important micronutrients and common foods where they can be found: Calcium - milk, yogurt, spinach, and sardines. Vitamin B12 - beef, fish, cheese, and eggs. Zinc - beef, cashews, garbanzo beans, and turkey.
[20] Who suggested that the most of the mass of atom is located in nucleus?
A.
Bohr
B.
Thomson
C.
Rutherford
D.
Avogadro
Ans:
Rutherford
Explanation :
The atom, as described by Ernest Rutherford, has a tiny, massive core called the nucleus. The nucleus has a positive charge.
[21] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[22] Which one of the following is a cation?
A.
Carbonate
B.
Nitrite
C.
Ammonium
D.
Hydroxide
Ans:
Ammonium
Explanation :
The ammonium cation is a positively charged polyatomic cation with the chemical formula NH4+.
[23] Ginger is an example of -
A.
Modified Node
B.
Modified Root
C.
Modified Stem
D.
Tap Root
Ans:
Modified Stem
Explanation :
Modified stems that grow above ground: Stolons or runners-are horizontally oriented stems that grow along the soil surface.
[24] The ore which is found in abundance in India is -
A.
monazite
B.
bauxite
C.
magnetite
D.
fluorspar
Ans:
monazite
Explanation :
The ore monazite is found in abundance in India.
[25] Baryllium Sulphate is less soluble in water due to –
A.
High inflammable energy
B.
Low Energy of dissociation
C.
Low inflammable energy
D.
Lonic band
Ans:
High inflammable energy
Explanation :
Beryllium sulfate (BeSO4) is a white crystalline e solid. It was first isolated in 1815 by Jons Jakob Berzelelu Beryllium sulfate may be prepared by treatingasne aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Beryllium Sulphate is less soluble in water due to High inflammable energy.
Explanation :
Gold plating is a method of depositing a thin layer of gold onto the surface of another metal, most often copper or silver (to make silver-gilt), by chemical or electrochemical plating. Electroplating of gold is done using a sulphate/sulfite based electrolyte. This product is environment and user friendly and moreover the electroplating rate is good.
[4] The basic chemical building block of natural rubber obtained from trees is –
A.
Isoprene
B.
Vinyl Chloride
C.
Acetylene
D.
Neoprene
Ans:
Isoprene
Explanation :
Isoprene was first isolated by thermal decomposition of natural rubber. About 95% of isoprene production is used to produce cis-1,4-polyisoprene---a synthetic version of natural rubber. Natural rubber consists mainly of poly-cis-isoprene with a molecular weight of 100,000 to 1,000,000.
[5] The name of plastic polymer from which combs, toys, bowls etc., can be made, is –
A.
Polyurethane
B.
Polystyrene
C.
Metallic polysulphides
D.
Teflon
Ans:
Polystyrene
Explanation :
Polystyrene is an synthetic aromatic polymer made from the monomer styrene, a liquid petrochemical. It is one of the most widely used plastics. Uses include protective packaging (such as packing peanuts and CD and DVD cases), containers (such as "clamshells"), lids, bottles, trays, tumblers, and disposable cutlery.
[6] 'Red Ink' is prepared from -
A.
Phenol
B.
Aniline
C.
Congo redd
D.
Eosin
Ans:
Eosin
Explanation :
Eosin is a dye used to prepare red ink. Eosin Y is a xanthene dye and is used for the differential staining of connective tissue and cytoplasm.
[7] Gas released during Bhopal tragedy was -
A.
Sodium isothiocyanate
B.
Ethyl isothiocyanate
C.
Potassium isothiocyanate
D.
Methyl isothiocyanate
Ans:
Methyl isothiocyanate
Explanation :
The Bhopal disaster or Bhopal gas tragedy was an industrial accident. It happened at a Union Carbide subsidiary pesticide plant in the city of Bhopal, India. On the night of 2-3 December 1984, the plant released 42 tonnes of toxic Methyl Isocyanate (MIC) gas, exposing more than 500,000 people to toxic gases.
[8] Oil of vitriol is -
A.
nitric acid
B.
sulfuric acid
C.
hydrochloric acid
D.
phosphoric acid
Ans:
sulfuric acid
Explanation :
Sulfuric acid or H2SO4 was called “oil of vitriol” by medieval European alchemists because it was prepared by roasting “green vitriol” in an iron retort.
[9] Hydrogen was discovered by -
A.
Cavendish
B.
Lavosier
C.
Rutherford
D.
Scheele
Ans:
Cavendish
Explanation :
In 1766, Henry Cavendish was the first to recognize hydrogen gas as a discrete substance, by naming the gas from a metal-acid reaction "flammable air".
[10] Glass is a –
A.
pure solid
B.
supercooled liquid
C.
gel
D.
polymer
Ans:
supercooled liquid
Explanation :
Glass is an amorphous (non-crystalline) solid material. Glasses are typically brittle and optically transparent. The standard definition of a glass (or vitreous solid) is a solid formed by rapid melt quenching. However, the term glass is often used to describe any amorphous solid that exhibits a glass transition temperature Tg.
[11] Uranium eventually decays into a stable isotope of —
A.
Radium
B.
Thorium
C.
Lead
D.
Polonium
Ans:
Lead
Explanation :
Natural uranium consists of three major isotopes: U238 (99.28% natural abundance), U235 (0.71%), and U234 (0.0054%). All three are radioactive, emitting alpha particles, with the exception that all three of these isotopes have small probabilities of undergoing spontaneous fission, rather than alpha emission. U23° is usually an alpha emitter (occasionally, it undergoes spontaneous fission), decaying through the Uranium Series of nuclear decay, which has 18 members, all of which eventually decay into Pb206, by a variety of different decay paths.
[12] The substance that is added to make natural rubber strong and more bouncy is –
A.
Polythene
B.
Sponge
C.
Sulphur
D.
Chlorine
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties.
[13] White phosphorus is always kept under –
A.
benzene
B.
kerosene
C.
ether
D.
water
Ans:
water
Explanation :
White phosphorus is a material made from a common allotrope of the chemical element phosphorus that is used in smoke, tracer, illumination and incendiary munitions. Other common names include WP, and the slang term "Willie Pete," which is dated from its use in Vietnam, and is still sometimes used in military jargon. As an incendiary weapon, white phosphorus burns fiercely and can set cloth, fuel, ammunition and other combustibles on fire, and cause serious burns or death and that is why it is kept in water.
[14] The amount of Chlorine available in water after disinfection is called as –
A.
free chlorine
B.
residual chlorine
C.
free available chlorine
D.
combined available chlorine
Ans:
residual chlorine
Explanation :
The word "residual" means "remainder" or "that which is left", and as the name suggests the chlorine residual is measure of the amount of chlorine remaining in the water after disinfection. The chlorine residual is usually tested in finished water which is ready to be released into the distribution system, although operators must also ensure that there is adequate residual at the extreme ends of the distribution system. Tests for chlorine residual are probably the most frequently performed tests at water treatment plants.
[15] What are the major pollutants of cigarette smoke?
A.
Carbon monoxide and dioxin
B.
Carbon monoxide and nicotine
C.
Carbon monoxide and benzene
D.
Dioxin and benzene
Ans:
Carbon monoxide and nicotine
Explanation :
Particulate matter consists of millions of tiny particles of diverse chemical composition. Particulate matter from tobacco smoke includes many particles in the size range that reflects light, which explains why tobacco smoke is easily seen by the eye. In contrast to smoke particles, gases emitted by the cigarette such as benzene and carbon monoxide (CO) are invisible to the eye. Particles smaller than 2.5 micrometers (PM2.5) are major components of cigarette smoke and can enter deep into the lung where they can cause serious health problems.
[16] The chemical name of 'Common salt' is –
A.
Sodium chloride
B.
Sodium nitrate
C.
Ammonium chloride
D.
Calcium chloride
Ans:
Sodium chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the formula NaCl, representing equal proportions of sodium and chloride. Sodium chloride is the salt most responsible for the salinity of the ocean and of the extracellular fluid of many multicellular organisms. As the major ingredient in edible salt, it is commonly used as a condiment and food preservative. In solid sodium chloride, each ion is surrounded by six ions of, the opposite charge as expected on electrostatic grounds.
[17] By-product obtained by soap industry is –
A.
Caustic soda
B.
Glycerol
C.
Naphthalene
D.
Caustic potash
Ans:
Glycerol
Explanation :
Glycerol forms the backbone of triglyeerides, and is chiefly produced by saponification of fats as a byproduct of soap-making. It is also a byproduct of the production of biodiesel via transesterification. This form of crude glycerin is often dark in appearance with a thick, syrup-like consistency.
[18] Polythene is polymer of –
A.
Ethylene
B.
Propylene
C.
Acetylene
D.
Aniline
Ans:
Ethylene
Explanation :
The ingredient or monomer is ethylene (IUPAC name ethene). It has the formula C2H4, consisting of a pair of CH2 groups connected by a double bond. Because the catalysts are highly reactive, the ethylene must be of high purity. Typical specifications are <5 ppm for water, oxygen, as well as other alkenes. Acceptable contaminants include N2, ethane (common precursor to ethylene), and methane. Ethylene is usually produced from petrochemical sources, but also is generated by dehydration of ethanol.
[19] Which one is not micronutrient?
A.
Iron
B.
Zinc
C.
Sulphur
D.
Manganese
Ans:
Sulphur
Explanation :
Here's a list of important micronutrients and common foods where they can be found: Calcium - milk, yogurt, spinach, and sardines. Vitamin B12 - beef, fish, cheese, and eggs. Zinc - beef, cashews, garbanzo beans, and turkey.
[20] Who suggested that the most of the mass of atom is located in nucleus?
A.
Bohr
B.
Thomson
C.
Rutherford
D.
Avogadro
Ans:
Rutherford
Explanation :
The atom, as described by Ernest Rutherford, has a tiny, massive core called the nucleus. The nucleus has a positive charge.
[21] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[22] Which one of the following is a cation?
A.
Carbonate
B.
Nitrite
C.
Ammonium
D.
Hydroxide
Ans:
Ammonium
Explanation :
The ammonium cation is a positively charged polyatomic cation with the chemical formula NH4+.
[23] Ginger is an example of -
A.
Modified Node
B.
Modified Root
C.
Modified Stem
D.
Tap Root
Ans:
Modified Stem
Explanation :
Modified stems that grow above ground: Stolons or runners-are horizontally oriented stems that grow along the soil surface.
[24] The ore which is found in abundance in India is -
A.
monazite
B.
bauxite
C.
magnetite
D.
fluorspar
Ans:
monazite
Explanation :
The ore monazite is found in abundance in India.
[25] Baryllium Sulphate is less soluble in water due to –
A.
High inflammable energy
B.
Low Energy of dissociation
C.
Low inflammable energy
D.
Lonic band
Ans:
High inflammable energy
Explanation :
Beryllium sulfate (BeSO4) is a white crystalline e solid. It was first isolated in 1815 by Jons Jakob Berzelelu Beryllium sulfate may be prepared by treatingasne aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Beryllium Sulphate is less soluble in water due to High inflammable energy.
Explanation :
Polystyrene is an synthetic aromatic polymer made from the monomer styrene, a liquid petrochemical. It is one of the most widely used plastics. Uses include protective packaging (such as packing peanuts and CD and DVD cases), containers (such as "clamshells"), lids, bottles, trays, tumblers, and disposable cutlery.
[6] 'Red Ink' is prepared from -
A.
Phenol
B.
Aniline
C.
Congo redd
D.
Eosin
Ans:
Eosin
Explanation :
Eosin is a dye used to prepare red ink. Eosin Y is a xanthene dye and is used for the differential staining of connective tissue and cytoplasm.
[7] Gas released during Bhopal tragedy was -
A.
Sodium isothiocyanate
B.
Ethyl isothiocyanate
C.
Potassium isothiocyanate
D.
Methyl isothiocyanate
Ans:
Methyl isothiocyanate
Explanation :
The Bhopal disaster or Bhopal gas tragedy was an industrial accident. It happened at a Union Carbide subsidiary pesticide plant in the city of Bhopal, India. On the night of 2-3 December 1984, the plant released 42 tonnes of toxic Methyl Isocyanate (MIC) gas, exposing more than 500,000 people to toxic gases.
[8] Oil of vitriol is -
A.
nitric acid
B.
sulfuric acid
C.
hydrochloric acid
D.
phosphoric acid
Ans:
sulfuric acid
Explanation :
Sulfuric acid or H2SO4 was called “oil of vitriol” by medieval European alchemists because it was prepared by roasting “green vitriol” in an iron retort.
[9] Hydrogen was discovered by -
A.
Cavendish
B.
Lavosier
C.
Rutherford
D.
Scheele
Ans:
Cavendish
Explanation :
In 1766, Henry Cavendish was the first to recognize hydrogen gas as a discrete substance, by naming the gas from a metal-acid reaction "flammable air".
[10] Glass is a –
A.
pure solid
B.
supercooled liquid
C.
gel
D.
polymer
Ans:
supercooled liquid
Explanation :
Glass is an amorphous (non-crystalline) solid material. Glasses are typically brittle and optically transparent. The standard definition of a glass (or vitreous solid) is a solid formed by rapid melt quenching. However, the term glass is often used to describe any amorphous solid that exhibits a glass transition temperature Tg.
[11] Uranium eventually decays into a stable isotope of —
A.
Radium
B.
Thorium
C.
Lead
D.
Polonium
Ans:
Lead
Explanation :
Natural uranium consists of three major isotopes: U238 (99.28% natural abundance), U235 (0.71%), and U234 (0.0054%). All three are radioactive, emitting alpha particles, with the exception that all three of these isotopes have small probabilities of undergoing spontaneous fission, rather than alpha emission. U23° is usually an alpha emitter (occasionally, it undergoes spontaneous fission), decaying through the Uranium Series of nuclear decay, which has 18 members, all of which eventually decay into Pb206, by a variety of different decay paths.
[12] The substance that is added to make natural rubber strong and more bouncy is –
A.
Polythene
B.
Sponge
C.
Sulphur
D.
Chlorine
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties.
[13] White phosphorus is always kept under –
A.
benzene
B.
kerosene
C.
ether
D.
water
Ans:
water
Explanation :
White phosphorus is a material made from a common allotrope of the chemical element phosphorus that is used in smoke, tracer, illumination and incendiary munitions. Other common names include WP, and the slang term "Willie Pete," which is dated from its use in Vietnam, and is still sometimes used in military jargon. As an incendiary weapon, white phosphorus burns fiercely and can set cloth, fuel, ammunition and other combustibles on fire, and cause serious burns or death and that is why it is kept in water.
[14] The amount of Chlorine available in water after disinfection is called as –
A.
free chlorine
B.
residual chlorine
C.
free available chlorine
D.
combined available chlorine
Ans:
residual chlorine
Explanation :
The word "residual" means "remainder" or "that which is left", and as the name suggests the chlorine residual is measure of the amount of chlorine remaining in the water after disinfection. The chlorine residual is usually tested in finished water which is ready to be released into the distribution system, although operators must also ensure that there is adequate residual at the extreme ends of the distribution system. Tests for chlorine residual are probably the most frequently performed tests at water treatment plants.
[15] What are the major pollutants of cigarette smoke?
A.
Carbon monoxide and dioxin
B.
Carbon monoxide and nicotine
C.
Carbon monoxide and benzene
D.
Dioxin and benzene
Ans:
Carbon monoxide and nicotine
Explanation :
Particulate matter consists of millions of tiny particles of diverse chemical composition. Particulate matter from tobacco smoke includes many particles in the size range that reflects light, which explains why tobacco smoke is easily seen by the eye. In contrast to smoke particles, gases emitted by the cigarette such as benzene and carbon monoxide (CO) are invisible to the eye. Particles smaller than 2.5 micrometers (PM2.5) are major components of cigarette smoke and can enter deep into the lung where they can cause serious health problems.
[16] The chemical name of 'Common salt' is –
A.
Sodium chloride
B.
Sodium nitrate
C.
Ammonium chloride
D.
Calcium chloride
Ans:
Sodium chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the formula NaCl, representing equal proportions of sodium and chloride. Sodium chloride is the salt most responsible for the salinity of the ocean and of the extracellular fluid of many multicellular organisms. As the major ingredient in edible salt, it is commonly used as a condiment and food preservative. In solid sodium chloride, each ion is surrounded by six ions of, the opposite charge as expected on electrostatic grounds.
[17] By-product obtained by soap industry is –
A.
Caustic soda
B.
Glycerol
C.
Naphthalene
D.
Caustic potash
Ans:
Glycerol
Explanation :
Glycerol forms the backbone of triglyeerides, and is chiefly produced by saponification of fats as a byproduct of soap-making. It is also a byproduct of the production of biodiesel via transesterification. This form of crude glycerin is often dark in appearance with a thick, syrup-like consistency.
[18] Polythene is polymer of –
A.
Ethylene
B.
Propylene
C.
Acetylene
D.
Aniline
Ans:
Ethylene
Explanation :
The ingredient or monomer is ethylene (IUPAC name ethene). It has the formula C2H4, consisting of a pair of CH2 groups connected by a double bond. Because the catalysts are highly reactive, the ethylene must be of high purity. Typical specifications are <5 ppm for water, oxygen, as well as other alkenes. Acceptable contaminants include N2, ethane (common precursor to ethylene), and methane. Ethylene is usually produced from petrochemical sources, but also is generated by dehydration of ethanol.
[19] Which one is not micronutrient?
A.
Iron
B.
Zinc
C.
Sulphur
D.
Manganese
Ans:
Sulphur
Explanation :
Here's a list of important micronutrients and common foods where they can be found: Calcium - milk, yogurt, spinach, and sardines. Vitamin B12 - beef, fish, cheese, and eggs. Zinc - beef, cashews, garbanzo beans, and turkey.
[20] Who suggested that the most of the mass of atom is located in nucleus?
A.
Bohr
B.
Thomson
C.
Rutherford
D.
Avogadro
Ans:
Rutherford
Explanation :
The atom, as described by Ernest Rutherford, has a tiny, massive core called the nucleus. The nucleus has a positive charge.
[21] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[22] Which one of the following is a cation?
A.
Carbonate
B.
Nitrite
C.
Ammonium
D.
Hydroxide
Ans:
Ammonium
Explanation :
The ammonium cation is a positively charged polyatomic cation with the chemical formula NH4+.
[23] Ginger is an example of -
A.
Modified Node
B.
Modified Root
C.
Modified Stem
D.
Tap Root
Ans:
Modified Stem
Explanation :
Modified stems that grow above ground: Stolons or runners-are horizontally oriented stems that grow along the soil surface.
[24] The ore which is found in abundance in India is -
A.
monazite
B.
bauxite
C.
magnetite
D.
fluorspar
Ans:
monazite
Explanation :
The ore monazite is found in abundance in India.
[25] Baryllium Sulphate is less soluble in water due to –
A.
High inflammable energy
B.
Low Energy of dissociation
C.
Low inflammable energy
D.
Lonic band
Ans:
High inflammable energy
Explanation :
Beryllium sulfate (BeSO4) is a white crystalline e solid. It was first isolated in 1815 by Jons Jakob Berzelelu Beryllium sulfate may be prepared by treatingasne aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Beryllium Sulphate is less soluble in water due to High inflammable energy.
Explanation :
The Bhopal disaster or Bhopal gas tragedy was an industrial accident. It happened at a Union Carbide subsidiary pesticide plant in the city of Bhopal, India. On the night of 2-3 December 1984, the plant released 42 tonnes of toxic Methyl Isocyanate (MIC) gas, exposing more than 500,000 people to toxic gases.
[8] Oil of vitriol is -
A.
nitric acid
B.
sulfuric acid
C.
hydrochloric acid
D.
phosphoric acid
Ans:
sulfuric acid
Explanation :
Sulfuric acid or H2SO4 was called “oil of vitriol” by medieval European alchemists because it was prepared by roasting “green vitriol” in an iron retort.
[9] Hydrogen was discovered by -
A.
Cavendish
B.
Lavosier
C.
Rutherford
D.
Scheele
Ans:
Cavendish
Explanation :
In 1766, Henry Cavendish was the first to recognize hydrogen gas as a discrete substance, by naming the gas from a metal-acid reaction "flammable air".
[10] Glass is a –
A.
pure solid
B.
supercooled liquid
C.
gel
D.
polymer
Ans:
supercooled liquid
Explanation :
Glass is an amorphous (non-crystalline) solid material. Glasses are typically brittle and optically transparent. The standard definition of a glass (or vitreous solid) is a solid formed by rapid melt quenching. However, the term glass is often used to describe any amorphous solid that exhibits a glass transition temperature Tg.
[11] Uranium eventually decays into a stable isotope of —
A.
Radium
B.
Thorium
C.
Lead
D.
Polonium
Ans:
Lead
Explanation :
Natural uranium consists of three major isotopes: U238 (99.28% natural abundance), U235 (0.71%), and U234 (0.0054%). All three are radioactive, emitting alpha particles, with the exception that all three of these isotopes have small probabilities of undergoing spontaneous fission, rather than alpha emission. U23° is usually an alpha emitter (occasionally, it undergoes spontaneous fission), decaying through the Uranium Series of nuclear decay, which has 18 members, all of which eventually decay into Pb206, by a variety of different decay paths.
[12] The substance that is added to make natural rubber strong and more bouncy is –
A.
Polythene
B.
Sponge
C.
Sulphur
D.
Chlorine
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties.
[13] White phosphorus is always kept under –
A.
benzene
B.
kerosene
C.
ether
D.
water
Ans:
water
Explanation :
White phosphorus is a material made from a common allotrope of the chemical element phosphorus that is used in smoke, tracer, illumination and incendiary munitions. Other common names include WP, and the slang term "Willie Pete," which is dated from its use in Vietnam, and is still sometimes used in military jargon. As an incendiary weapon, white phosphorus burns fiercely and can set cloth, fuel, ammunition and other combustibles on fire, and cause serious burns or death and that is why it is kept in water.
[14] The amount of Chlorine available in water after disinfection is called as –
A.
free chlorine
B.
residual chlorine
C.
free available chlorine
D.
combined available chlorine
Ans:
residual chlorine
Explanation :
The word "residual" means "remainder" or "that which is left", and as the name suggests the chlorine residual is measure of the amount of chlorine remaining in the water after disinfection. The chlorine residual is usually tested in finished water which is ready to be released into the distribution system, although operators must also ensure that there is adequate residual at the extreme ends of the distribution system. Tests for chlorine residual are probably the most frequently performed tests at water treatment plants.
[15] What are the major pollutants of cigarette smoke?
A.
Carbon monoxide and dioxin
B.
Carbon monoxide and nicotine
C.
Carbon monoxide and benzene
D.
Dioxin and benzene
Ans:
Carbon monoxide and nicotine
Explanation :
Particulate matter consists of millions of tiny particles of diverse chemical composition. Particulate matter from tobacco smoke includes many particles in the size range that reflects light, which explains why tobacco smoke is easily seen by the eye. In contrast to smoke particles, gases emitted by the cigarette such as benzene and carbon monoxide (CO) are invisible to the eye. Particles smaller than 2.5 micrometers (PM2.5) are major components of cigarette smoke and can enter deep into the lung where they can cause serious health problems.
[16] The chemical name of 'Common salt' is –
A.
Sodium chloride
B.
Sodium nitrate
C.
Ammonium chloride
D.
Calcium chloride
Ans:
Sodium chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the formula NaCl, representing equal proportions of sodium and chloride. Sodium chloride is the salt most responsible for the salinity of the ocean and of the extracellular fluid of many multicellular organisms. As the major ingredient in edible salt, it is commonly used as a condiment and food preservative. In solid sodium chloride, each ion is surrounded by six ions of, the opposite charge as expected on electrostatic grounds.
[17] By-product obtained by soap industry is –
A.
Caustic soda
B.
Glycerol
C.
Naphthalene
D.
Caustic potash
Ans:
Glycerol
Explanation :
Glycerol forms the backbone of triglyeerides, and is chiefly produced by saponification of fats as a byproduct of soap-making. It is also a byproduct of the production of biodiesel via transesterification. This form of crude glycerin is often dark in appearance with a thick, syrup-like consistency.
[18] Polythene is polymer of –
A.
Ethylene
B.
Propylene
C.
Acetylene
D.
Aniline
Ans:
Ethylene
Explanation :
The ingredient or monomer is ethylene (IUPAC name ethene). It has the formula C2H4, consisting of a pair of CH2 groups connected by a double bond. Because the catalysts are highly reactive, the ethylene must be of high purity. Typical specifications are <5 ppm for water, oxygen, as well as other alkenes. Acceptable contaminants include N2, ethane (common precursor to ethylene), and methane. Ethylene is usually produced from petrochemical sources, but also is generated by dehydration of ethanol.
[19] Which one is not micronutrient?
A.
Iron
B.
Zinc
C.
Sulphur
D.
Manganese
Ans:
Sulphur
Explanation :
Here's a list of important micronutrients and common foods where they can be found: Calcium - milk, yogurt, spinach, and sardines. Vitamin B12 - beef, fish, cheese, and eggs. Zinc - beef, cashews, garbanzo beans, and turkey.
[20] Who suggested that the most of the mass of atom is located in nucleus?
A.
Bohr
B.
Thomson
C.
Rutherford
D.
Avogadro
Ans:
Rutherford
Explanation :
The atom, as described by Ernest Rutherford, has a tiny, massive core called the nucleus. The nucleus has a positive charge.
[21] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[22] Which one of the following is a cation?
A.
Carbonate
B.
Nitrite
C.
Ammonium
D.
Hydroxide
Ans:
Ammonium
Explanation :
The ammonium cation is a positively charged polyatomic cation with the chemical formula NH4+.
[23] Ginger is an example of -
A.
Modified Node
B.
Modified Root
C.
Modified Stem
D.
Tap Root
Ans:
Modified Stem
Explanation :
Modified stems that grow above ground: Stolons or runners-are horizontally oriented stems that grow along the soil surface.
[24] The ore which is found in abundance in India is -
A.
monazite
B.
bauxite
C.
magnetite
D.
fluorspar
Ans:
monazite
Explanation :
The ore monazite is found in abundance in India.
[25] Baryllium Sulphate is less soluble in water due to –
A.
High inflammable energy
B.
Low Energy of dissociation
C.
Low inflammable energy
D.
Lonic band
Ans:
High inflammable energy
Explanation :
Beryllium sulfate (BeSO4) is a white crystalline e solid. It was first isolated in 1815 by Jons Jakob Berzelelu Beryllium sulfate may be prepared by treatingasne aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Beryllium Sulphate is less soluble in water due to High inflammable energy.
Explanation :
In 1766, Henry Cavendish was the first to recognize hydrogen gas as a discrete substance, by naming the gas from a metal-acid reaction "flammable air".
[10] Glass is a –
A.
pure solid
B.
supercooled liquid
C.
gel
D.
polymer
Ans:
supercooled liquid
Explanation :
Glass is an amorphous (non-crystalline) solid material. Glasses are typically brittle and optically transparent. The standard definition of a glass (or vitreous solid) is a solid formed by rapid melt quenching. However, the term glass is often used to describe any amorphous solid that exhibits a glass transition temperature Tg.
[11] Uranium eventually decays into a stable isotope of —
A.
Radium
B.
Thorium
C.
Lead
D.
Polonium
Ans:
Lead
Explanation :
Natural uranium consists of three major isotopes: U238 (99.28% natural abundance), U235 (0.71%), and U234 (0.0054%). All three are radioactive, emitting alpha particles, with the exception that all three of these isotopes have small probabilities of undergoing spontaneous fission, rather than alpha emission. U23° is usually an alpha emitter (occasionally, it undergoes spontaneous fission), decaying through the Uranium Series of nuclear decay, which has 18 members, all of which eventually decay into Pb206, by a variety of different decay paths.
[12] The substance that is added to make natural rubber strong and more bouncy is –
A.
Polythene
B.
Sponge
C.
Sulphur
D.
Chlorine
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties.
[13] White phosphorus is always kept under –
A.
benzene
B.
kerosene
C.
ether
D.
water
Ans:
water
Explanation :
White phosphorus is a material made from a common allotrope of the chemical element phosphorus that is used in smoke, tracer, illumination and incendiary munitions. Other common names include WP, and the slang term "Willie Pete," which is dated from its use in Vietnam, and is still sometimes used in military jargon. As an incendiary weapon, white phosphorus burns fiercely and can set cloth, fuel, ammunition and other combustibles on fire, and cause serious burns or death and that is why it is kept in water.
[14] The amount of Chlorine available in water after disinfection is called as –
A.
free chlorine
B.
residual chlorine
C.
free available chlorine
D.
combined available chlorine
Ans:
residual chlorine
Explanation :
The word "residual" means "remainder" or "that which is left", and as the name suggests the chlorine residual is measure of the amount of chlorine remaining in the water after disinfection. The chlorine residual is usually tested in finished water which is ready to be released into the distribution system, although operators must also ensure that there is adequate residual at the extreme ends of the distribution system. Tests for chlorine residual are probably the most frequently performed tests at water treatment plants.
[15] What are the major pollutants of cigarette smoke?
A.
Carbon monoxide and dioxin
B.
Carbon monoxide and nicotine
C.
Carbon monoxide and benzene
D.
Dioxin and benzene
Ans:
Carbon monoxide and nicotine
Explanation :
Particulate matter consists of millions of tiny particles of diverse chemical composition. Particulate matter from tobacco smoke includes many particles in the size range that reflects light, which explains why tobacco smoke is easily seen by the eye. In contrast to smoke particles, gases emitted by the cigarette such as benzene and carbon monoxide (CO) are invisible to the eye. Particles smaller than 2.5 micrometers (PM2.5) are major components of cigarette smoke and can enter deep into the lung where they can cause serious health problems.
[16] The chemical name of 'Common salt' is –
A.
Sodium chloride
B.
Sodium nitrate
C.
Ammonium chloride
D.
Calcium chloride
Ans:
Sodium chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the formula NaCl, representing equal proportions of sodium and chloride. Sodium chloride is the salt most responsible for the salinity of the ocean and of the extracellular fluid of many multicellular organisms. As the major ingredient in edible salt, it is commonly used as a condiment and food preservative. In solid sodium chloride, each ion is surrounded by six ions of, the opposite charge as expected on electrostatic grounds.
[17] By-product obtained by soap industry is –
A.
Caustic soda
B.
Glycerol
C.
Naphthalene
D.
Caustic potash
Ans:
Glycerol
Explanation :
Glycerol forms the backbone of triglyeerides, and is chiefly produced by saponification of fats as a byproduct of soap-making. It is also a byproduct of the production of biodiesel via transesterification. This form of crude glycerin is often dark in appearance with a thick, syrup-like consistency.
[18] Polythene is polymer of –
A.
Ethylene
B.
Propylene
C.
Acetylene
D.
Aniline
Ans:
Ethylene
Explanation :
The ingredient or monomer is ethylene (IUPAC name ethene). It has the formula C2H4, consisting of a pair of CH2 groups connected by a double bond. Because the catalysts are highly reactive, the ethylene must be of high purity. Typical specifications are <5 ppm for water, oxygen, as well as other alkenes. Acceptable contaminants include N2, ethane (common precursor to ethylene), and methane. Ethylene is usually produced from petrochemical sources, but also is generated by dehydration of ethanol.
[19] Which one is not micronutrient?
A.
Iron
B.
Zinc
C.
Sulphur
D.
Manganese
Ans:
Sulphur
Explanation :
Here's a list of important micronutrients and common foods where they can be found: Calcium - milk, yogurt, spinach, and sardines. Vitamin B12 - beef, fish, cheese, and eggs. Zinc - beef, cashews, garbanzo beans, and turkey.
[20] Who suggested that the most of the mass of atom is located in nucleus?
A.
Bohr
B.
Thomson
C.
Rutherford
D.
Avogadro
Ans:
Rutherford
Explanation :
The atom, as described by Ernest Rutherford, has a tiny, massive core called the nucleus. The nucleus has a positive charge.
[21] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[22] Which one of the following is a cation?
A.
Carbonate
B.
Nitrite
C.
Ammonium
D.
Hydroxide
Ans:
Ammonium
Explanation :
The ammonium cation is a positively charged polyatomic cation with the chemical formula NH4+.
[23] Ginger is an example of -
A.
Modified Node
B.
Modified Root
C.
Modified Stem
D.
Tap Root
Ans:
Modified Stem
Explanation :
Modified stems that grow above ground: Stolons or runners-are horizontally oriented stems that grow along the soil surface.
[24] The ore which is found in abundance in India is -
A.
monazite
B.
bauxite
C.
magnetite
D.
fluorspar
Ans:
monazite
Explanation :
The ore monazite is found in abundance in India.
[25] Baryllium Sulphate is less soluble in water due to –
A.
High inflammable energy
B.
Low Energy of dissociation
C.
Low inflammable energy
D.
Lonic band
Ans:
High inflammable energy
Explanation :
Beryllium sulfate (BeSO4) is a white crystalline e solid. It was first isolated in 1815 by Jons Jakob Berzelelu Beryllium sulfate may be prepared by treatingasne aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Beryllium Sulphate is less soluble in water due to High inflammable energy.
Explanation :
Natural uranium consists of three major isotopes: U238 (99.28% natural abundance), U235 (0.71%), and U234 (0.0054%). All three are radioactive, emitting alpha particles, with the exception that all three of these isotopes have small probabilities of undergoing spontaneous fission, rather than alpha emission. U23° is usually an alpha emitter (occasionally, it undergoes spontaneous fission), decaying through the Uranium Series of nuclear decay, which has 18 members, all of which eventually decay into Pb206, by a variety of different decay paths.
[12] The substance that is added to make natural rubber strong and more bouncy is –
A.
Polythene
B.
Sponge
C.
Sulphur
D.
Chlorine
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties.
[13] White phosphorus is always kept under –
A.
benzene
B.
kerosene
C.
ether
D.
water
Ans:
water
Explanation :
White phosphorus is a material made from a common allotrope of the chemical element phosphorus that is used in smoke, tracer, illumination and incendiary munitions. Other common names include WP, and the slang term "Willie Pete," which is dated from its use in Vietnam, and is still sometimes used in military jargon. As an incendiary weapon, white phosphorus burns fiercely and can set cloth, fuel, ammunition and other combustibles on fire, and cause serious burns or death and that is why it is kept in water.
[14] The amount of Chlorine available in water after disinfection is called as –
A.
free chlorine
B.
residual chlorine
C.
free available chlorine
D.
combined available chlorine
Ans:
residual chlorine
Explanation :
The word "residual" means "remainder" or "that which is left", and as the name suggests the chlorine residual is measure of the amount of chlorine remaining in the water after disinfection. The chlorine residual is usually tested in finished water which is ready to be released into the distribution system, although operators must also ensure that there is adequate residual at the extreme ends of the distribution system. Tests for chlorine residual are probably the most frequently performed tests at water treatment plants.
[15] What are the major pollutants of cigarette smoke?
A.
Carbon monoxide and dioxin
B.
Carbon monoxide and nicotine
C.
Carbon monoxide and benzene
D.
Dioxin and benzene
Ans:
Carbon monoxide and nicotine
Explanation :
Particulate matter consists of millions of tiny particles of diverse chemical composition. Particulate matter from tobacco smoke includes many particles in the size range that reflects light, which explains why tobacco smoke is easily seen by the eye. In contrast to smoke particles, gases emitted by the cigarette such as benzene and carbon monoxide (CO) are invisible to the eye. Particles smaller than 2.5 micrometers (PM2.5) are major components of cigarette smoke and can enter deep into the lung where they can cause serious health problems.
[16] The chemical name of 'Common salt' is –
A.
Sodium chloride
B.
Sodium nitrate
C.
Ammonium chloride
D.
Calcium chloride
Ans:
Sodium chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the formula NaCl, representing equal proportions of sodium and chloride. Sodium chloride is the salt most responsible for the salinity of the ocean and of the extracellular fluid of many multicellular organisms. As the major ingredient in edible salt, it is commonly used as a condiment and food preservative. In solid sodium chloride, each ion is surrounded by six ions of, the opposite charge as expected on electrostatic grounds.
[17] By-product obtained by soap industry is –
A.
Caustic soda
B.
Glycerol
C.
Naphthalene
D.
Caustic potash
Ans:
Glycerol
Explanation :
Glycerol forms the backbone of triglyeerides, and is chiefly produced by saponification of fats as a byproduct of soap-making. It is also a byproduct of the production of biodiesel via transesterification. This form of crude glycerin is often dark in appearance with a thick, syrup-like consistency.
[18] Polythene is polymer of –
A.
Ethylene
B.
Propylene
C.
Acetylene
D.
Aniline
Ans:
Ethylene
Explanation :
The ingredient or monomer is ethylene (IUPAC name ethene). It has the formula C2H4, consisting of a pair of CH2 groups connected by a double bond. Because the catalysts are highly reactive, the ethylene must be of high purity. Typical specifications are <5 ppm for water, oxygen, as well as other alkenes. Acceptable contaminants include N2, ethane (common precursor to ethylene), and methane. Ethylene is usually produced from petrochemical sources, but also is generated by dehydration of ethanol.
[19] Which one is not micronutrient?
A.
Iron
B.
Zinc
C.
Sulphur
D.
Manganese
Ans:
Sulphur
Explanation :
Here's a list of important micronutrients and common foods where they can be found: Calcium - milk, yogurt, spinach, and sardines. Vitamin B12 - beef, fish, cheese, and eggs. Zinc - beef, cashews, garbanzo beans, and turkey.
[20] Who suggested that the most of the mass of atom is located in nucleus?
A.
Bohr
B.
Thomson
C.
Rutherford
D.
Avogadro
Ans:
Rutherford
Explanation :
The atom, as described by Ernest Rutherford, has a tiny, massive core called the nucleus. The nucleus has a positive charge.
[21] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[22] Which one of the following is a cation?
A.
Carbonate
B.
Nitrite
C.
Ammonium
D.
Hydroxide
Ans:
Ammonium
Explanation :
The ammonium cation is a positively charged polyatomic cation with the chemical formula NH4+.
[23] Ginger is an example of -
A.
Modified Node
B.
Modified Root
C.
Modified Stem
D.
Tap Root
Ans:
Modified Stem
Explanation :
Modified stems that grow above ground: Stolons or runners-are horizontally oriented stems that grow along the soil surface.
[24] The ore which is found in abundance in India is -
A.
monazite
B.
bauxite
C.
magnetite
D.
fluorspar
Ans:
monazite
Explanation :
The ore monazite is found in abundance in India.
[25] Baryllium Sulphate is less soluble in water due to –
A.
High inflammable energy
B.
Low Energy of dissociation
C.
Low inflammable energy
D.
Lonic band
Ans:
High inflammable energy
Explanation :
Beryllium sulfate (BeSO4) is a white crystalline e solid. It was first isolated in 1815 by Jons Jakob Berzelelu Beryllium sulfate may be prepared by treatingasne aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Beryllium Sulphate is less soluble in water due to High inflammable energy.
Explanation :
White phosphorus is a material made from a common allotrope of the chemical element phosphorus that is used in smoke, tracer, illumination and incendiary munitions. Other common names include WP, and the slang term "Willie Pete," which is dated from its use in Vietnam, and is still sometimes used in military jargon. As an incendiary weapon, white phosphorus burns fiercely and can set cloth, fuel, ammunition and other combustibles on fire, and cause serious burns or death and that is why it is kept in water.
[14] The amount of Chlorine available in water after disinfection is called as –
A.
free chlorine
B.
residual chlorine
C.
free available chlorine
D.
combined available chlorine
Ans:
residual chlorine
Explanation :
The word "residual" means "remainder" or "that which is left", and as the name suggests the chlorine residual is measure of the amount of chlorine remaining in the water after disinfection. The chlorine residual is usually tested in finished water which is ready to be released into the distribution system, although operators must also ensure that there is adequate residual at the extreme ends of the distribution system. Tests for chlorine residual are probably the most frequently performed tests at water treatment plants.
[15] What are the major pollutants of cigarette smoke?
A.
Carbon monoxide and dioxin
B.
Carbon monoxide and nicotine
C.
Carbon monoxide and benzene
D.
Dioxin and benzene
Ans:
Carbon monoxide and nicotine
Explanation :
Particulate matter consists of millions of tiny particles of diverse chemical composition. Particulate matter from tobacco smoke includes many particles in the size range that reflects light, which explains why tobacco smoke is easily seen by the eye. In contrast to smoke particles, gases emitted by the cigarette such as benzene and carbon monoxide (CO) are invisible to the eye. Particles smaller than 2.5 micrometers (PM2.5) are major components of cigarette smoke and can enter deep into the lung where they can cause serious health problems.
[16] The chemical name of 'Common salt' is –
A.
Sodium chloride
B.
Sodium nitrate
C.
Ammonium chloride
D.
Calcium chloride
Ans:
Sodium chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the formula NaCl, representing equal proportions of sodium and chloride. Sodium chloride is the salt most responsible for the salinity of the ocean and of the extracellular fluid of many multicellular organisms. As the major ingredient in edible salt, it is commonly used as a condiment and food preservative. In solid sodium chloride, each ion is surrounded by six ions of, the opposite charge as expected on electrostatic grounds.
[17] By-product obtained by soap industry is –
A.
Caustic soda
B.
Glycerol
C.
Naphthalene
D.
Caustic potash
Ans:
Glycerol
Explanation :
Glycerol forms the backbone of triglyeerides, and is chiefly produced by saponification of fats as a byproduct of soap-making. It is also a byproduct of the production of biodiesel via transesterification. This form of crude glycerin is often dark in appearance with a thick, syrup-like consistency.
[18] Polythene is polymer of –
A.
Ethylene
B.
Propylene
C.
Acetylene
D.
Aniline
Ans:
Ethylene
Explanation :
The ingredient or monomer is ethylene (IUPAC name ethene). It has the formula C2H4, consisting of a pair of CH2 groups connected by a double bond. Because the catalysts are highly reactive, the ethylene must be of high purity. Typical specifications are <5 ppm for water, oxygen, as well as other alkenes. Acceptable contaminants include N2, ethane (common precursor to ethylene), and methane. Ethylene is usually produced from petrochemical sources, but also is generated by dehydration of ethanol.
[19] Which one is not micronutrient?
A.
Iron
B.
Zinc
C.
Sulphur
D.
Manganese
Ans:
Sulphur
Explanation :
Here's a list of important micronutrients and common foods where they can be found: Calcium - milk, yogurt, spinach, and sardines. Vitamin B12 - beef, fish, cheese, and eggs. Zinc - beef, cashews, garbanzo beans, and turkey.
[20] Who suggested that the most of the mass of atom is located in nucleus?
A.
Bohr
B.
Thomson
C.
Rutherford
D.
Avogadro
Ans:
Rutherford
Explanation :
The atom, as described by Ernest Rutherford, has a tiny, massive core called the nucleus. The nucleus has a positive charge.
[21] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[22] Which one of the following is a cation?
A.
Carbonate
B.
Nitrite
C.
Ammonium
D.
Hydroxide
Ans:
Ammonium
Explanation :
The ammonium cation is a positively charged polyatomic cation with the chemical formula NH4+.
[23] Ginger is an example of -
A.
Modified Node
B.
Modified Root
C.
Modified Stem
D.
Tap Root
Ans:
Modified Stem
Explanation :
Modified stems that grow above ground: Stolons or runners-are horizontally oriented stems that grow along the soil surface.
[24] The ore which is found in abundance in India is -
A.
monazite
B.
bauxite
C.
magnetite
D.
fluorspar
Ans:
monazite
Explanation :
The ore monazite is found in abundance in India.
[25] Baryllium Sulphate is less soluble in water due to –
A.
High inflammable energy
B.
Low Energy of dissociation
C.
Low inflammable energy
D.
Lonic band
Ans:
High inflammable energy
Explanation :
Beryllium sulfate (BeSO4) is a white crystalline e solid. It was first isolated in 1815 by Jons Jakob Berzelelu Beryllium sulfate may be prepared by treatingasne aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Beryllium Sulphate is less soluble in water due to High inflammable energy.
Explanation :
Particulate matter consists of millions of tiny particles of diverse chemical composition. Particulate matter from tobacco smoke includes many particles in the size range that reflects light, which explains why tobacco smoke is easily seen by the eye. In contrast to smoke particles, gases emitted by the cigarette such as benzene and carbon monoxide (CO) are invisible to the eye. Particles smaller than 2.5 micrometers (PM2.5) are major components of cigarette smoke and can enter deep into the lung where they can cause serious health problems.
[16] The chemical name of 'Common salt' is –
A.
Sodium chloride
B.
Sodium nitrate
C.
Ammonium chloride
D.
Calcium chloride
Ans:
Sodium chloride
Explanation :
Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the formula NaCl, representing equal proportions of sodium and chloride. Sodium chloride is the salt most responsible for the salinity of the ocean and of the extracellular fluid of many multicellular organisms. As the major ingredient in edible salt, it is commonly used as a condiment and food preservative. In solid sodium chloride, each ion is surrounded by six ions of, the opposite charge as expected on electrostatic grounds.
[17] By-product obtained by soap industry is –
A.
Caustic soda
B.
Glycerol
C.
Naphthalene
D.
Caustic potash
Ans:
Glycerol
Explanation :
Glycerol forms the backbone of triglyeerides, and is chiefly produced by saponification of fats as a byproduct of soap-making. It is also a byproduct of the production of biodiesel via transesterification. This form of crude glycerin is often dark in appearance with a thick, syrup-like consistency.
[18] Polythene is polymer of –
A.
Ethylene
B.
Propylene
C.
Acetylene
D.
Aniline
Ans:
Ethylene
Explanation :
The ingredient or monomer is ethylene (IUPAC name ethene). It has the formula C2H4, consisting of a pair of CH2 groups connected by a double bond. Because the catalysts are highly reactive, the ethylene must be of high purity. Typical specifications are <5 ppm for water, oxygen, as well as other alkenes. Acceptable contaminants include N2, ethane (common precursor to ethylene), and methane. Ethylene is usually produced from petrochemical sources, but also is generated by dehydration of ethanol.
[19] Which one is not micronutrient?
A.
Iron
B.
Zinc
C.
Sulphur
D.
Manganese
Ans:
Sulphur
Explanation :
Here's a list of important micronutrients and common foods where they can be found: Calcium - milk, yogurt, spinach, and sardines. Vitamin B12 - beef, fish, cheese, and eggs. Zinc - beef, cashews, garbanzo beans, and turkey.
[20] Who suggested that the most of the mass of atom is located in nucleus?
A.
Bohr
B.
Thomson
C.
Rutherford
D.
Avogadro
Ans:
Rutherford
Explanation :
The atom, as described by Ernest Rutherford, has a tiny, massive core called the nucleus. The nucleus has a positive charge.
[21] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[22] Which one of the following is a cation?
A.
Carbonate
B.
Nitrite
C.
Ammonium
D.
Hydroxide
Ans:
Ammonium
Explanation :
The ammonium cation is a positively charged polyatomic cation with the chemical formula NH4+.
[23] Ginger is an example of -
A.
Modified Node
B.
Modified Root
C.
Modified Stem
D.
Tap Root
Ans:
Modified Stem
Explanation :
Modified stems that grow above ground: Stolons or runners-are horizontally oriented stems that grow along the soil surface.
[24] The ore which is found in abundance in India is -
A.
monazite
B.
bauxite
C.
magnetite
D.
fluorspar
Ans:
monazite
Explanation :
The ore monazite is found in abundance in India.
[25] Baryllium Sulphate is less soluble in water due to –
A.
High inflammable energy
B.
Low Energy of dissociation
C.
Low inflammable energy
D.
Lonic band
Ans:
High inflammable energy
Explanation :
Beryllium sulfate (BeSO4) is a white crystalline e solid. It was first isolated in 1815 by Jons Jakob Berzelelu Beryllium sulfate may be prepared by treatingasne aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Beryllium Sulphate is less soluble in water due to High inflammable energy.
Explanation :
Glycerol forms the backbone of triglyeerides, and is chiefly produced by saponification of fats as a byproduct of soap-making. It is also a byproduct of the production of biodiesel via transesterification. This form of crude glycerin is often dark in appearance with a thick, syrup-like consistency.
[18] Polythene is polymer of –
A.
Ethylene
B.
Propylene
C.
Acetylene
D.
Aniline
Ans:
Ethylene
Explanation :
The ingredient or monomer is ethylene (IUPAC name ethene). It has the formula C2H4, consisting of a pair of CH2 groups connected by a double bond. Because the catalysts are highly reactive, the ethylene must be of high purity. Typical specifications are <5 ppm for water, oxygen, as well as other alkenes. Acceptable contaminants include N2, ethane (common precursor to ethylene), and methane. Ethylene is usually produced from petrochemical sources, but also is generated by dehydration of ethanol.
[19] Which one is not micronutrient?
A.
Iron
B.
Zinc
C.
Sulphur
D.
Manganese
Ans:
Sulphur
Explanation :
Here's a list of important micronutrients and common foods where they can be found: Calcium - milk, yogurt, spinach, and sardines. Vitamin B12 - beef, fish, cheese, and eggs. Zinc - beef, cashews, garbanzo beans, and turkey.
[20] Who suggested that the most of the mass of atom is located in nucleus?
A.
Bohr
B.
Thomson
C.
Rutherford
D.
Avogadro
Ans:
Rutherford
Explanation :
The atom, as described by Ernest Rutherford, has a tiny, massive core called the nucleus. The nucleus has a positive charge.
[21] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[22] Which one of the following is a cation?
A.
Carbonate
B.
Nitrite
C.
Ammonium
D.
Hydroxide
Ans:
Ammonium
Explanation :
The ammonium cation is a positively charged polyatomic cation with the chemical formula NH4+.
[23] Ginger is an example of -
A.
Modified Node
B.
Modified Root
C.
Modified Stem
D.
Tap Root
Ans:
Modified Stem
Explanation :
Modified stems that grow above ground: Stolons or runners-are horizontally oriented stems that grow along the soil surface.
[24] The ore which is found in abundance in India is -
A.
monazite
B.
bauxite
C.
magnetite
D.
fluorspar
Ans:
monazite
Explanation :
The ore monazite is found in abundance in India.
[25] Baryllium Sulphate is less soluble in water due to –
A.
High inflammable energy
B.
Low Energy of dissociation
C.
Low inflammable energy
D.
Lonic band
Ans:
High inflammable energy
Explanation :
Beryllium sulfate (BeSO4) is a white crystalline e solid. It was first isolated in 1815 by Jons Jakob Berzelelu Beryllium sulfate may be prepared by treatingasne aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Beryllium Sulphate is less soluble in water due to High inflammable energy.
Explanation :
Here's a list of important micronutrients and common foods where they can be found: Calcium - milk, yogurt, spinach, and sardines. Vitamin B12 - beef, fish, cheese, and eggs. Zinc - beef, cashews, garbanzo beans, and turkey.
[20] Who suggested that the most of the mass of atom is located in nucleus?
A.
Bohr
B.
Thomson
C.
Rutherford
D.
Avogadro
Ans:
Rutherford
Explanation :
The atom, as described by Ernest Rutherford, has a tiny, massive core called the nucleus. The nucleus has a positive charge.
[21] Electromagnet is constructed with which of the following?
A.
Steel
B.
Soft Iron
C.
Aluminium
D.
Nickel
Ans:
Soft Iron
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[22] Which one of the following is a cation?
A.
Carbonate
B.
Nitrite
C.
Ammonium
D.
Hydroxide
Ans:
Ammonium
Explanation :
The ammonium cation is a positively charged polyatomic cation with the chemical formula NH4+.
[23] Ginger is an example of -
A.
Modified Node
B.
Modified Root
C.
Modified Stem
D.
Tap Root
Ans:
Modified Stem
Explanation :
Modified stems that grow above ground: Stolons or runners-are horizontally oriented stems that grow along the soil surface.
[24] The ore which is found in abundance in India is -
A.
monazite
B.
bauxite
C.
magnetite
D.
fluorspar
Ans:
monazite
Explanation :
The ore monazite is found in abundance in India.
[25] Baryllium Sulphate is less soluble in water due to –
A.
High inflammable energy
B.
Low Energy of dissociation
C.
Low inflammable energy
D.
Lonic band
Ans:
High inflammable energy
Explanation :
Beryllium sulfate (BeSO4) is a white crystalline e solid. It was first isolated in 1815 by Jons Jakob Berzelelu Beryllium sulfate may be prepared by treatingasne aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Beryllium Sulphate is less soluble in water due to High inflammable energy.
Explanation :
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
[22] Which one of the following is a cation?
A.
Carbonate
B.
Nitrite
C.
Ammonium
D.
Hydroxide
Ans:
Ammonium
Explanation :
The ammonium cation is a positively charged polyatomic cation with the chemical formula NH4+.
[23] Ginger is an example of -
A.
Modified Node
B.
Modified Root
C.
Modified Stem
D.
Tap Root
Ans:
Modified Stem
Explanation :
Modified stems that grow above ground: Stolons or runners-are horizontally oriented stems that grow along the soil surface.
[24] The ore which is found in abundance in India is -
A.
monazite
B.
bauxite
C.
magnetite
D.
fluorspar
Ans:
monazite
Explanation :
The ore monazite is found in abundance in India.
[25] Baryllium Sulphate is less soluble in water due to –
A.
High inflammable energy
B.
Low Energy of dissociation
C.
Low inflammable energy
D.
Lonic band
Ans:
High inflammable energy
Explanation :
Beryllium sulfate (BeSO4) is a white crystalline e solid. It was first isolated in 1815 by Jons Jakob Berzelelu Beryllium sulfate may be prepared by treatingasne aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Beryllium Sulphate is less soluble in water due to High inflammable energy.
Explanation :
Modified stems that grow above ground: Stolons or runners-are horizontally oriented stems that grow along the soil surface.
[24] The ore which is found in abundance in India is -
A.
monazite
B.
bauxite
C.
magnetite
D.
fluorspar
Ans:
monazite
Explanation :
The ore monazite is found in abundance in India.
[25] Baryllium Sulphate is less soluble in water due to –
A.
High inflammable energy
B.
Low Energy of dissociation
C.
Low inflammable energy
D.
Lonic band
Ans:
High inflammable energy
Explanation :
Beryllium sulfate (BeSO4) is a white crystalline e solid. It was first isolated in 1815 by Jons Jakob Berzelelu Beryllium sulfate may be prepared by treatingasne aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Beryllium Sulphate is less soluble in water due to High inflammable energy.
Explanation :
Beryllium sulfate (BeSO4) is a white crystalline e solid. It was first isolated in 1815 by Jons Jakob Berzelelu Beryllium sulfate may be prepared by treatingasne aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Beryllium Sulphate is less soluble in water due to High inflammable energy.