[1] Which is used in preparation of dynamite?
A.
glycerol
B.
ethyl alcohol
C.
methyl alcohol
D.
glycol
Ans:
glycerol
Explanation :
Dynamite is an explosive made of nitroglycerin, sorbents (such as powdered shells or clay) and stabilizers. It was invented by the Swedish chemist and engineer Alfred Nobel in Geesthacht, and patented in 1867.
[2] Which among the following is a carbohydrate?
A.
Nylon
B.
Cane-sugar
C.
Turpentine
D.
Hydrogen peroxide
Ans:
Cane-sugar
Explanation :
Cane-sugar is carbohydrate and as this name implies, is composed of carbon, hydrogen and oxygen. it is a source of extracting sugar. There are various types of sugar derived from different sources. Simple sugars are called monosaccharides and include glucose, fructose and galactose. The table or granulated sugar most customarily used as food is sucrose, a disaccharide. Other disaccharides include maltose and lactose.
[3] Which among the following metals provides amphoteric oxide?
A.
Sodium
B.
Silver
C.
Aluminium
D.
Calcium
Ans:
Aluminium
Explanation :
In chemistry, an amphoteric species is a molecule or ion that can react as an acid as well as a base. Many metals (such as zinc, tin, lead, aluminium, and beryllium) and most metalloids form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation state of the oxide. One type of amphoteric species areamphiprotic molecules, which can either donate or accept a proton (H+). Examples include amino acids and proteins, which have amine and carboxylic acid groups, and self- ionizable compounds such as water and ammonia.
[4] Iodine can be separated from a mixture of Iodine and Potassium Chloride by –
A.
sedimentation
B.
filtration
C.
sublimation
D.
distillation
Ans:
sublimation
Explanation :
Iodine is well known to sublime (change from solid to gas without becoming liquid in between) when heated. However sodium chloride has a melting point much higher than that of iodine. Therefore, a mixture of iodine and sodium chloride can be separated by using a sublimation apparatus, with solid iodine collected by condensation on a cold surface.
[5] Identify the metal which is non toxic in nature.
A.
Chromium
B.
Gold
C.
Cadmium
D.
Cobalt
Ans:
Gold
Explanation :
Toxic metals are metals that form poisonous soluble compounds and have no biological role, i.e. are not essential minerals, or are in the wrong form. Most often the definition includes at least cadmium, lead, mercury and the radioactive metals. Metals in an oxidation state abnormal to the body may also become toxic: chromium (III) is an essential trace element, but chromium (VI) is a carcinogen. Similarly, cobalt could also be toxic.
[6] Bakelite is a copolymer of Phenol and -
A.
Formaldehyde
B.
Acetaldehyde
C.
Benzaldehyde
D.
Cinnaldehyde
Ans:
Formaldehyde
Explanation :
Bakelite is an early plastic. It is a thermosetting phenol formaldehyde resin, formed from an elimination reaction of phenol with formaldehyde.
[7] What is a mixture of potassium nitrate powdered charcoal and sulphur called?
A.
paint
B.
aluminium
C.
brass
D.
gun powder
Ans:
gun powder
Explanation :
Gun powder is the mixture of potassium nitrate powdered charcoal and sulphur.
[8] Which among the following metal is used for galvanization?
A.
Zinc
B.
Copper
C.
Iron
D.
Silver
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which parts are submerged in a bath of molten zinc.
[9] The lightest radioactive element is -
A.
deuterium
B.
polonium
C.
tritium
D.
uranium
Ans:
tritium
Explanation :
Tritium is the only radioactive isotope of hydrogen and the other two have stable nuclei. As hydrogen is the lightest element in the periodic table, tritium will be the lightest radioactive isotope in the periodic table.
[10] The chemical used in developing photographic films is –
A.
silver bromide
B.
hypo
C.
sodium sulphate
D.
hydroquinone
Ans:
silver bromide
Explanation :
Tritium is a radioactive isotope of hydrogen. It is the lightest radioactive element.
[11] Hard water and soft water can be distinguished by using –
A.
dilute acid
B.
ordinary soap
C.
detergent
D.
liquid soap
Ans:
detergent
Explanation :
0
[12] Gamma rays are -
A.
High energy electrons
B.
Low energy electrons
C.
High energy electromagnetic
D.
High energy positron waves
Ans:
High energy electromagnetic
Explanation :
Gamma rays (γ) refer to electromagnetic radiation of an extremely high frequency and therefore consist of high energy photons.
[13] The name of unreactive gas is –
A.
Carbon dioxide
B.
Hydrogen
C.
Nitrogen
D.
Oxygen
Ans:
Nitrogen
Explanation :
Nitrogen is chemically unreactive because it has a strong triple bond which binds the two nitrogen atoms together making it harder for it to be broken. It does not burn, and at ordinary temperatures it does not react with other elements.
[14] Heavy water is so called because it contains -
A.
Heavy isotope of hydrogen
B.
Heavy isotope of oxygen
C.
Mole number of hydrogen atoms
D.
Mole number of oxygen atoms
Ans:
Heavy isotope of hydrogen
Explanation :
Heavy water, formally called deuterium oxide, is a form of "water that contains a larger than normal amount of the hydrogen isotope deuterium, (also known as "heavy hydrogen") rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water.
[15] Heating of a ore below its melting point in the absence of air is known as –
A.
Refining
B.
Calcination
C.
Roasting
D.
Smelting
Ans:
Calcination
Explanation :
Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of metal as well as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.
[16] The most electronegative element among the following is –
A.
Fluorine
B.
Sodium
C.
Chlorine
D.
Oxygen
Ans:
Fluorine
Explanation :
Electronegativity of the elements using the Pooling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[17] The quality of petrol is expressed in terms of –
A.
Cetane number
B.
Gold number
C.
Octane number
D.
Added unlead compounds
Ans:
Octane number
Explanation :
Octane rating or octane number is a standard measure of the of the ignition quality of has (gasoline or petrol). Higher this number, the less susceptible is the gas to `knocking' (explosion caused by its premature burning in the combustioncharnber) when burnt in a standard (spark-ignition internal combustion) engine.
[18] The percentage of Nitrogen in Air is -
A.
0.94
B.
0.03
C.
78.03
D.
85.02
Ans:
78.03
Explanation :
By volume, thy air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%.
[19] Energy is continuously generated in the sun due to _.
A.
Nuclear fusion
B.
Nuclear fission
C.
Radioactivity
D.
Artificial radioactivity
Ans:
Nuclear fusion
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[20] The apparatus used to test acidity of aqueous solution is -
A.
pH meter
B.
Ammeter
C.
Hygrometer
D.
Acidmeter
Ans:
pH meter
Explanation :
A pH meter is an electronic device used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading.
[21] Chemical formula of washing soda is -
A.
Na2SO4.10H2O
B.
NaHCO3
C.
Na2CO3.10H2O
D.
Ca(OH)2
Ans:
Na2CO3.10H2O
Explanation :
Washing Soda is essentially Sodium Carbonate, a sodium salt of carbonic acid (soluble in water). The molecular formula of washing soda is Na2CO3.10H2O. It is used as an agent to soften hard water. It reacts with the calcium and magnesium bonds present in the water, enabling the detergent to work.
[22] Which one of the following elements is an example of noble gas?
A.
Nitrogen
B.
Hydrogen
C.
Chlorine
D.
Helium
Ans:
Helium
Explanation :
Noble gas refers to any of the seven chemical elements that make up Group Villa of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and element 118 (temporarily named ununoctium [Uuo]).
[23] Which of the following elements does not exhibit natural radioactivity?
A.
Uranium
B.
Thorium
C.
Aluminium
D.
Polonium
Ans:
Aluminium
Explanation :
Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust.
[24] Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
A.
Chlorofluorocarbons
B.
Nitrous oxide
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol.
[25] In which of the following states maximum iron ore is found?
A.
FeCO₃
B.
Fe₂O₃
C.
Fe₃O₄
D.
FeS₂
Ans:
Fe₂O₃
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red.
Explanation :
Dynamite is an explosive made of nitroglycerin, sorbents (such as powdered shells or clay) and stabilizers. It was invented by the Swedish chemist and engineer Alfred Nobel in Geesthacht, and patented in 1867.
[2] Which among the following is a carbohydrate?
A.
Nylon
B.
Cane-sugar
C.
Turpentine
D.
Hydrogen peroxide
Ans:
Cane-sugar
Explanation :
Cane-sugar is carbohydrate and as this name implies, is composed of carbon, hydrogen and oxygen. it is a source of extracting sugar. There are various types of sugar derived from different sources. Simple sugars are called monosaccharides and include glucose, fructose and galactose. The table or granulated sugar most customarily used as food is sucrose, a disaccharide. Other disaccharides include maltose and lactose.
[3] Which among the following metals provides amphoteric oxide?
A.
Sodium
B.
Silver
C.
Aluminium
D.
Calcium
Ans:
Aluminium
Explanation :
In chemistry, an amphoteric species is a molecule or ion that can react as an acid as well as a base. Many metals (such as zinc, tin, lead, aluminium, and beryllium) and most metalloids form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation state of the oxide. One type of amphoteric species areamphiprotic molecules, which can either donate or accept a proton (H+). Examples include amino acids and proteins, which have amine and carboxylic acid groups, and self- ionizable compounds such as water and ammonia.
[4] Iodine can be separated from a mixture of Iodine and Potassium Chloride by –
A.
sedimentation
B.
filtration
C.
sublimation
D.
distillation
Ans:
sublimation
Explanation :
Iodine is well known to sublime (change from solid to gas without becoming liquid in between) when heated. However sodium chloride has a melting point much higher than that of iodine. Therefore, a mixture of iodine and sodium chloride can be separated by using a sublimation apparatus, with solid iodine collected by condensation on a cold surface.
[5] Identify the metal which is non toxic in nature.
A.
Chromium
B.
Gold
C.
Cadmium
D.
Cobalt
Ans:
Gold
Explanation :
Toxic metals are metals that form poisonous soluble compounds and have no biological role, i.e. are not essential minerals, or are in the wrong form. Most often the definition includes at least cadmium, lead, mercury and the radioactive metals. Metals in an oxidation state abnormal to the body may also become toxic: chromium (III) is an essential trace element, but chromium (VI) is a carcinogen. Similarly, cobalt could also be toxic.
[6] Bakelite is a copolymer of Phenol and -
A.
Formaldehyde
B.
Acetaldehyde
C.
Benzaldehyde
D.
Cinnaldehyde
Ans:
Formaldehyde
Explanation :
Bakelite is an early plastic. It is a thermosetting phenol formaldehyde resin, formed from an elimination reaction of phenol with formaldehyde.
[7] What is a mixture of potassium nitrate powdered charcoal and sulphur called?
A.
paint
B.
aluminium
C.
brass
D.
gun powder
Ans:
gun powder
Explanation :
Gun powder is the mixture of potassium nitrate powdered charcoal and sulphur.
[8] Which among the following metal is used for galvanization?
A.
Zinc
B.
Copper
C.
Iron
D.
Silver
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which parts are submerged in a bath of molten zinc.
[9] The lightest radioactive element is -
A.
deuterium
B.
polonium
C.
tritium
D.
uranium
Ans:
tritium
Explanation :
Tritium is the only radioactive isotope of hydrogen and the other two have stable nuclei. As hydrogen is the lightest element in the periodic table, tritium will be the lightest radioactive isotope in the periodic table.
[10] The chemical used in developing photographic films is –
A.
silver bromide
B.
hypo
C.
sodium sulphate
D.
hydroquinone
Ans:
silver bromide
Explanation :
Tritium is a radioactive isotope of hydrogen. It is the lightest radioactive element.
[11] Hard water and soft water can be distinguished by using –
A.
dilute acid
B.
ordinary soap
C.
detergent
D.
liquid soap
Ans:
detergent
Explanation :
0
[12] Gamma rays are -
A.
High energy electrons
B.
Low energy electrons
C.
High energy electromagnetic
D.
High energy positron waves
Ans:
High energy electromagnetic
Explanation :
Gamma rays (γ) refer to electromagnetic radiation of an extremely high frequency and therefore consist of high energy photons.
[13] The name of unreactive gas is –
A.
Carbon dioxide
B.
Hydrogen
C.
Nitrogen
D.
Oxygen
Ans:
Nitrogen
Explanation :
Nitrogen is chemically unreactive because it has a strong triple bond which binds the two nitrogen atoms together making it harder for it to be broken. It does not burn, and at ordinary temperatures it does not react with other elements.
[14] Heavy water is so called because it contains -
A.
Heavy isotope of hydrogen
B.
Heavy isotope of oxygen
C.
Mole number of hydrogen atoms
D.
Mole number of oxygen atoms
Ans:
Heavy isotope of hydrogen
Explanation :
Heavy water, formally called deuterium oxide, is a form of "water that contains a larger than normal amount of the hydrogen isotope deuterium, (also known as "heavy hydrogen") rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water.
[15] Heating of a ore below its melting point in the absence of air is known as –
A.
Refining
B.
Calcination
C.
Roasting
D.
Smelting
Ans:
Calcination
Explanation :
Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of metal as well as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.
[16] The most electronegative element among the following is –
A.
Fluorine
B.
Sodium
C.
Chlorine
D.
Oxygen
Ans:
Fluorine
Explanation :
Electronegativity of the elements using the Pooling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[17] The quality of petrol is expressed in terms of –
A.
Cetane number
B.
Gold number
C.
Octane number
D.
Added unlead compounds
Ans:
Octane number
Explanation :
Octane rating or octane number is a standard measure of the of the ignition quality of has (gasoline or petrol). Higher this number, the less susceptible is the gas to `knocking' (explosion caused by its premature burning in the combustioncharnber) when burnt in a standard (spark-ignition internal combustion) engine.
[18] The percentage of Nitrogen in Air is -
A.
0.94
B.
0.03
C.
78.03
D.
85.02
Ans:
78.03
Explanation :
By volume, thy air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%.
[19] Energy is continuously generated in the sun due to _.
A.
Nuclear fusion
B.
Nuclear fission
C.
Radioactivity
D.
Artificial radioactivity
Ans:
Nuclear fusion
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[20] The apparatus used to test acidity of aqueous solution is -
A.
pH meter
B.
Ammeter
C.
Hygrometer
D.
Acidmeter
Ans:
pH meter
Explanation :
A pH meter is an electronic device used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading.
[21] Chemical formula of washing soda is -
A.
Na2SO4.10H2O
B.
NaHCO3
C.
Na2CO3.10H2O
D.
Ca(OH)2
Ans:
Na2CO3.10H2O
Explanation :
Washing Soda is essentially Sodium Carbonate, a sodium salt of carbonic acid (soluble in water). The molecular formula of washing soda is Na2CO3.10H2O. It is used as an agent to soften hard water. It reacts with the calcium and magnesium bonds present in the water, enabling the detergent to work.
[22] Which one of the following elements is an example of noble gas?
A.
Nitrogen
B.
Hydrogen
C.
Chlorine
D.
Helium
Ans:
Helium
Explanation :
Noble gas refers to any of the seven chemical elements that make up Group Villa of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and element 118 (temporarily named ununoctium [Uuo]).
[23] Which of the following elements does not exhibit natural radioactivity?
A.
Uranium
B.
Thorium
C.
Aluminium
D.
Polonium
Ans:
Aluminium
Explanation :
Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust.
[24] Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
A.
Chlorofluorocarbons
B.
Nitrous oxide
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol.
[25] In which of the following states maximum iron ore is found?
A.
FeCO₃
B.
Fe₂O₃
C.
Fe₃O₄
D.
FeS₂
Ans:
Fe₂O₃
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red.
Explanation :
In chemistry, an amphoteric species is a molecule or ion that can react as an acid as well as a base. Many metals (such as zinc, tin, lead, aluminium, and beryllium) and most metalloids form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation state of the oxide. One type of amphoteric species areamphiprotic molecules, which can either donate or accept a proton (H+). Examples include amino acids and proteins, which have amine and carboxylic acid groups, and self- ionizable compounds such as water and ammonia.
[4] Iodine can be separated from a mixture of Iodine and Potassium Chloride by –
A.
sedimentation
B.
filtration
C.
sublimation
D.
distillation
Ans:
sublimation
Explanation :
Iodine is well known to sublime (change from solid to gas without becoming liquid in between) when heated. However sodium chloride has a melting point much higher than that of iodine. Therefore, a mixture of iodine and sodium chloride can be separated by using a sublimation apparatus, with solid iodine collected by condensation on a cold surface.
[5] Identify the metal which is non toxic in nature.
A.
Chromium
B.
Gold
C.
Cadmium
D.
Cobalt
Ans:
Gold
Explanation :
Toxic metals are metals that form poisonous soluble compounds and have no biological role, i.e. are not essential minerals, or are in the wrong form. Most often the definition includes at least cadmium, lead, mercury and the radioactive metals. Metals in an oxidation state abnormal to the body may also become toxic: chromium (III) is an essential trace element, but chromium (VI) is a carcinogen. Similarly, cobalt could also be toxic.
[6] Bakelite is a copolymer of Phenol and -
A.
Formaldehyde
B.
Acetaldehyde
C.
Benzaldehyde
D.
Cinnaldehyde
Ans:
Formaldehyde
Explanation :
Bakelite is an early plastic. It is a thermosetting phenol formaldehyde resin, formed from an elimination reaction of phenol with formaldehyde.
[7] What is a mixture of potassium nitrate powdered charcoal and sulphur called?
A.
paint
B.
aluminium
C.
brass
D.
gun powder
Ans:
gun powder
Explanation :
Gun powder is the mixture of potassium nitrate powdered charcoal and sulphur.
[8] Which among the following metal is used for galvanization?
A.
Zinc
B.
Copper
C.
Iron
D.
Silver
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which parts are submerged in a bath of molten zinc.
[9] The lightest radioactive element is -
A.
deuterium
B.
polonium
C.
tritium
D.
uranium
Ans:
tritium
Explanation :
Tritium is the only radioactive isotope of hydrogen and the other two have stable nuclei. As hydrogen is the lightest element in the periodic table, tritium will be the lightest radioactive isotope in the periodic table.
[10] The chemical used in developing photographic films is –
A.
silver bromide
B.
hypo
C.
sodium sulphate
D.
hydroquinone
Ans:
silver bromide
Explanation :
Tritium is a radioactive isotope of hydrogen. It is the lightest radioactive element.
[11] Hard water and soft water can be distinguished by using –
A.
dilute acid
B.
ordinary soap
C.
detergent
D.
liquid soap
Ans:
detergent
Explanation :
0
[12] Gamma rays are -
A.
High energy electrons
B.
Low energy electrons
C.
High energy electromagnetic
D.
High energy positron waves
Ans:
High energy electromagnetic
Explanation :
Gamma rays (γ) refer to electromagnetic radiation of an extremely high frequency and therefore consist of high energy photons.
[13] The name of unreactive gas is –
A.
Carbon dioxide
B.
Hydrogen
C.
Nitrogen
D.
Oxygen
Ans:
Nitrogen
Explanation :
Nitrogen is chemically unreactive because it has a strong triple bond which binds the two nitrogen atoms together making it harder for it to be broken. It does not burn, and at ordinary temperatures it does not react with other elements.
[14] Heavy water is so called because it contains -
A.
Heavy isotope of hydrogen
B.
Heavy isotope of oxygen
C.
Mole number of hydrogen atoms
D.
Mole number of oxygen atoms
Ans:
Heavy isotope of hydrogen
Explanation :
Heavy water, formally called deuterium oxide, is a form of "water that contains a larger than normal amount of the hydrogen isotope deuterium, (also known as "heavy hydrogen") rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water.
[15] Heating of a ore below its melting point in the absence of air is known as –
A.
Refining
B.
Calcination
C.
Roasting
D.
Smelting
Ans:
Calcination
Explanation :
Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of metal as well as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.
[16] The most electronegative element among the following is –
A.
Fluorine
B.
Sodium
C.
Chlorine
D.
Oxygen
Ans:
Fluorine
Explanation :
Electronegativity of the elements using the Pooling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[17] The quality of petrol is expressed in terms of –
A.
Cetane number
B.
Gold number
C.
Octane number
D.
Added unlead compounds
Ans:
Octane number
Explanation :
Octane rating or octane number is a standard measure of the of the ignition quality of has (gasoline or petrol). Higher this number, the less susceptible is the gas to `knocking' (explosion caused by its premature burning in the combustioncharnber) when burnt in a standard (spark-ignition internal combustion) engine.
[18] The percentage of Nitrogen in Air is -
A.
0.94
B.
0.03
C.
78.03
D.
85.02
Ans:
78.03
Explanation :
By volume, thy air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%.
[19] Energy is continuously generated in the sun due to _.
A.
Nuclear fusion
B.
Nuclear fission
C.
Radioactivity
D.
Artificial radioactivity
Ans:
Nuclear fusion
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[20] The apparatus used to test acidity of aqueous solution is -
A.
pH meter
B.
Ammeter
C.
Hygrometer
D.
Acidmeter
Ans:
pH meter
Explanation :
A pH meter is an electronic device used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading.
[21] Chemical formula of washing soda is -
A.
Na2SO4.10H2O
B.
NaHCO3
C.
Na2CO3.10H2O
D.
Ca(OH)2
Ans:
Na2CO3.10H2O
Explanation :
Washing Soda is essentially Sodium Carbonate, a sodium salt of carbonic acid (soluble in water). The molecular formula of washing soda is Na2CO3.10H2O. It is used as an agent to soften hard water. It reacts with the calcium and magnesium bonds present in the water, enabling the detergent to work.
[22] Which one of the following elements is an example of noble gas?
A.
Nitrogen
B.
Hydrogen
C.
Chlorine
D.
Helium
Ans:
Helium
Explanation :
Noble gas refers to any of the seven chemical elements that make up Group Villa of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and element 118 (temporarily named ununoctium [Uuo]).
[23] Which of the following elements does not exhibit natural radioactivity?
A.
Uranium
B.
Thorium
C.
Aluminium
D.
Polonium
Ans:
Aluminium
Explanation :
Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust.
[24] Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
A.
Chlorofluorocarbons
B.
Nitrous oxide
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol.
[25] In which of the following states maximum iron ore is found?
A.
FeCO₃
B.
Fe₂O₃
C.
Fe₃O₄
D.
FeS₂
Ans:
Fe₂O₃
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red.
Explanation :
Toxic metals are metals that form poisonous soluble compounds and have no biological role, i.e. are not essential minerals, or are in the wrong form. Most often the definition includes at least cadmium, lead, mercury and the radioactive metals. Metals in an oxidation state abnormal to the body may also become toxic: chromium (III) is an essential trace element, but chromium (VI) is a carcinogen. Similarly, cobalt could also be toxic.
[6] Bakelite is a copolymer of Phenol and -
A.
Formaldehyde
B.
Acetaldehyde
C.
Benzaldehyde
D.
Cinnaldehyde
Ans:
Formaldehyde
Explanation :
Bakelite is an early plastic. It is a thermosetting phenol formaldehyde resin, formed from an elimination reaction of phenol with formaldehyde.
[7] What is a mixture of potassium nitrate powdered charcoal and sulphur called?
A.
paint
B.
aluminium
C.
brass
D.
gun powder
Ans:
gun powder
Explanation :
Gun powder is the mixture of potassium nitrate powdered charcoal and sulphur.
[8] Which among the following metal is used for galvanization?
A.
Zinc
B.
Copper
C.
Iron
D.
Silver
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which parts are submerged in a bath of molten zinc.
[9] The lightest radioactive element is -
A.
deuterium
B.
polonium
C.
tritium
D.
uranium
Ans:
tritium
Explanation :
Tritium is the only radioactive isotope of hydrogen and the other two have stable nuclei. As hydrogen is the lightest element in the periodic table, tritium will be the lightest radioactive isotope in the periodic table.
[10] The chemical used in developing photographic films is –
A.
silver bromide
B.
hypo
C.
sodium sulphate
D.
hydroquinone
Ans:
silver bromide
Explanation :
Tritium is a radioactive isotope of hydrogen. It is the lightest radioactive element.
[11] Hard water and soft water can be distinguished by using –
A.
dilute acid
B.
ordinary soap
C.
detergent
D.
liquid soap
Ans:
detergent
Explanation :
0
[12] Gamma rays are -
A.
High energy electrons
B.
Low energy electrons
C.
High energy electromagnetic
D.
High energy positron waves
Ans:
High energy electromagnetic
Explanation :
Gamma rays (γ) refer to electromagnetic radiation of an extremely high frequency and therefore consist of high energy photons.
[13] The name of unreactive gas is –
A.
Carbon dioxide
B.
Hydrogen
C.
Nitrogen
D.
Oxygen
Ans:
Nitrogen
Explanation :
Nitrogen is chemically unreactive because it has a strong triple bond which binds the two nitrogen atoms together making it harder for it to be broken. It does not burn, and at ordinary temperatures it does not react with other elements.
[14] Heavy water is so called because it contains -
A.
Heavy isotope of hydrogen
B.
Heavy isotope of oxygen
C.
Mole number of hydrogen atoms
D.
Mole number of oxygen atoms
Ans:
Heavy isotope of hydrogen
Explanation :
Heavy water, formally called deuterium oxide, is a form of "water that contains a larger than normal amount of the hydrogen isotope deuterium, (also known as "heavy hydrogen") rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water.
[15] Heating of a ore below its melting point in the absence of air is known as –
A.
Refining
B.
Calcination
C.
Roasting
D.
Smelting
Ans:
Calcination
Explanation :
Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of metal as well as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.
[16] The most electronegative element among the following is –
A.
Fluorine
B.
Sodium
C.
Chlorine
D.
Oxygen
Ans:
Fluorine
Explanation :
Electronegativity of the elements using the Pooling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[17] The quality of petrol is expressed in terms of –
A.
Cetane number
B.
Gold number
C.
Octane number
D.
Added unlead compounds
Ans:
Octane number
Explanation :
Octane rating or octane number is a standard measure of the of the ignition quality of has (gasoline or petrol). Higher this number, the less susceptible is the gas to `knocking' (explosion caused by its premature burning in the combustioncharnber) when burnt in a standard (spark-ignition internal combustion) engine.
[18] The percentage of Nitrogen in Air is -
A.
0.94
B.
0.03
C.
78.03
D.
85.02
Ans:
78.03
Explanation :
By volume, thy air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%.
[19] Energy is continuously generated in the sun due to _.
A.
Nuclear fusion
B.
Nuclear fission
C.
Radioactivity
D.
Artificial radioactivity
Ans:
Nuclear fusion
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[20] The apparatus used to test acidity of aqueous solution is -
A.
pH meter
B.
Ammeter
C.
Hygrometer
D.
Acidmeter
Ans:
pH meter
Explanation :
A pH meter is an electronic device used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading.
[21] Chemical formula of washing soda is -
A.
Na2SO4.10H2O
B.
NaHCO3
C.
Na2CO3.10H2O
D.
Ca(OH)2
Ans:
Na2CO3.10H2O
Explanation :
Washing Soda is essentially Sodium Carbonate, a sodium salt of carbonic acid (soluble in water). The molecular formula of washing soda is Na2CO3.10H2O. It is used as an agent to soften hard water. It reacts with the calcium and magnesium bonds present in the water, enabling the detergent to work.
[22] Which one of the following elements is an example of noble gas?
A.
Nitrogen
B.
Hydrogen
C.
Chlorine
D.
Helium
Ans:
Helium
Explanation :
Noble gas refers to any of the seven chemical elements that make up Group Villa of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and element 118 (temporarily named ununoctium [Uuo]).
[23] Which of the following elements does not exhibit natural radioactivity?
A.
Uranium
B.
Thorium
C.
Aluminium
D.
Polonium
Ans:
Aluminium
Explanation :
Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust.
[24] Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
A.
Chlorofluorocarbons
B.
Nitrous oxide
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol.
[25] In which of the following states maximum iron ore is found?
A.
FeCO₃
B.
Fe₂O₃
C.
Fe₃O₄
D.
FeS₂
Ans:
Fe₂O₃
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red.
Explanation :
Gun powder is the mixture of potassium nitrate powdered charcoal and sulphur.
[8] Which among the following metal is used for galvanization?
A.
Zinc
B.
Copper
C.
Iron
D.
Silver
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which parts are submerged in a bath of molten zinc.
[9] The lightest radioactive element is -
A.
deuterium
B.
polonium
C.
tritium
D.
uranium
Ans:
tritium
Explanation :
Tritium is the only radioactive isotope of hydrogen and the other two have stable nuclei. As hydrogen is the lightest element in the periodic table, tritium will be the lightest radioactive isotope in the periodic table.
[10] The chemical used in developing photographic films is –
A.
silver bromide
B.
hypo
C.
sodium sulphate
D.
hydroquinone
Ans:
silver bromide
Explanation :
Tritium is a radioactive isotope of hydrogen. It is the lightest radioactive element.
[11] Hard water and soft water can be distinguished by using –
A.
dilute acid
B.
ordinary soap
C.
detergent
D.
liquid soap
Ans:
detergent
Explanation :
0
[12] Gamma rays are -
A.
High energy electrons
B.
Low energy electrons
C.
High energy electromagnetic
D.
High energy positron waves
Ans:
High energy electromagnetic
Explanation :
Gamma rays (γ) refer to electromagnetic radiation of an extremely high frequency and therefore consist of high energy photons.
[13] The name of unreactive gas is –
A.
Carbon dioxide
B.
Hydrogen
C.
Nitrogen
D.
Oxygen
Ans:
Nitrogen
Explanation :
Nitrogen is chemically unreactive because it has a strong triple bond which binds the two nitrogen atoms together making it harder for it to be broken. It does not burn, and at ordinary temperatures it does not react with other elements.
[14] Heavy water is so called because it contains -
A.
Heavy isotope of hydrogen
B.
Heavy isotope of oxygen
C.
Mole number of hydrogen atoms
D.
Mole number of oxygen atoms
Ans:
Heavy isotope of hydrogen
Explanation :
Heavy water, formally called deuterium oxide, is a form of "water that contains a larger than normal amount of the hydrogen isotope deuterium, (also known as "heavy hydrogen") rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water.
[15] Heating of a ore below its melting point in the absence of air is known as –
A.
Refining
B.
Calcination
C.
Roasting
D.
Smelting
Ans:
Calcination
Explanation :
Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of metal as well as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.
[16] The most electronegative element among the following is –
A.
Fluorine
B.
Sodium
C.
Chlorine
D.
Oxygen
Ans:
Fluorine
Explanation :
Electronegativity of the elements using the Pooling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[17] The quality of petrol is expressed in terms of –
A.
Cetane number
B.
Gold number
C.
Octane number
D.
Added unlead compounds
Ans:
Octane number
Explanation :
Octane rating or octane number is a standard measure of the of the ignition quality of has (gasoline or petrol). Higher this number, the less susceptible is the gas to `knocking' (explosion caused by its premature burning in the combustioncharnber) when burnt in a standard (spark-ignition internal combustion) engine.
[18] The percentage of Nitrogen in Air is -
A.
0.94
B.
0.03
C.
78.03
D.
85.02
Ans:
78.03
Explanation :
By volume, thy air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%.
[19] Energy is continuously generated in the sun due to _.
A.
Nuclear fusion
B.
Nuclear fission
C.
Radioactivity
D.
Artificial radioactivity
Ans:
Nuclear fusion
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[20] The apparatus used to test acidity of aqueous solution is -
A.
pH meter
B.
Ammeter
C.
Hygrometer
D.
Acidmeter
Ans:
pH meter
Explanation :
A pH meter is an electronic device used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading.
[21] Chemical formula of washing soda is -
A.
Na2SO4.10H2O
B.
NaHCO3
C.
Na2CO3.10H2O
D.
Ca(OH)2
Ans:
Na2CO3.10H2O
Explanation :
Washing Soda is essentially Sodium Carbonate, a sodium salt of carbonic acid (soluble in water). The molecular formula of washing soda is Na2CO3.10H2O. It is used as an agent to soften hard water. It reacts with the calcium and magnesium bonds present in the water, enabling the detergent to work.
[22] Which one of the following elements is an example of noble gas?
A.
Nitrogen
B.
Hydrogen
C.
Chlorine
D.
Helium
Ans:
Helium
Explanation :
Noble gas refers to any of the seven chemical elements that make up Group Villa of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and element 118 (temporarily named ununoctium [Uuo]).
[23] Which of the following elements does not exhibit natural radioactivity?
A.
Uranium
B.
Thorium
C.
Aluminium
D.
Polonium
Ans:
Aluminium
Explanation :
Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust.
[24] Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
A.
Chlorofluorocarbons
B.
Nitrous oxide
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol.
[25] In which of the following states maximum iron ore is found?
A.
FeCO₃
B.
Fe₂O₃
C.
Fe₃O₄
D.
FeS₂
Ans:
Fe₂O₃
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red.
Explanation :
Tritium is the only radioactive isotope of hydrogen and the other two have stable nuclei. As hydrogen is the lightest element in the periodic table, tritium will be the lightest radioactive isotope in the periodic table.
[10] The chemical used in developing photographic films is –
A.
silver bromide
B.
hypo
C.
sodium sulphate
D.
hydroquinone
Ans:
silver bromide
Explanation :
Tritium is a radioactive isotope of hydrogen. It is the lightest radioactive element.
[11] Hard water and soft water can be distinguished by using –
A.
dilute acid
B.
ordinary soap
C.
detergent
D.
liquid soap
Ans:
detergent
Explanation :
0
[12] Gamma rays are -
A.
High energy electrons
B.
Low energy electrons
C.
High energy electromagnetic
D.
High energy positron waves
Ans:
High energy electromagnetic
Explanation :
Gamma rays (γ) refer to electromagnetic radiation of an extremely high frequency and therefore consist of high energy photons.
[13] The name of unreactive gas is –
A.
Carbon dioxide
B.
Hydrogen
C.
Nitrogen
D.
Oxygen
Ans:
Nitrogen
Explanation :
Nitrogen is chemically unreactive because it has a strong triple bond which binds the two nitrogen atoms together making it harder for it to be broken. It does not burn, and at ordinary temperatures it does not react with other elements.
[14] Heavy water is so called because it contains -
A.
Heavy isotope of hydrogen
B.
Heavy isotope of oxygen
C.
Mole number of hydrogen atoms
D.
Mole number of oxygen atoms
Ans:
Heavy isotope of hydrogen
Explanation :
Heavy water, formally called deuterium oxide, is a form of "water that contains a larger than normal amount of the hydrogen isotope deuterium, (also known as "heavy hydrogen") rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water.
[15] Heating of a ore below its melting point in the absence of air is known as –
A.
Refining
B.
Calcination
C.
Roasting
D.
Smelting
Ans:
Calcination
Explanation :
Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of metal as well as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.
[16] The most electronegative element among the following is –
A.
Fluorine
B.
Sodium
C.
Chlorine
D.
Oxygen
Ans:
Fluorine
Explanation :
Electronegativity of the elements using the Pooling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[17] The quality of petrol is expressed in terms of –
A.
Cetane number
B.
Gold number
C.
Octane number
D.
Added unlead compounds
Ans:
Octane number
Explanation :
Octane rating or octane number is a standard measure of the of the ignition quality of has (gasoline or petrol). Higher this number, the less susceptible is the gas to `knocking' (explosion caused by its premature burning in the combustioncharnber) when burnt in a standard (spark-ignition internal combustion) engine.
[18] The percentage of Nitrogen in Air is -
A.
0.94
B.
0.03
C.
78.03
D.
85.02
Ans:
78.03
Explanation :
By volume, thy air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%.
[19] Energy is continuously generated in the sun due to _.
A.
Nuclear fusion
B.
Nuclear fission
C.
Radioactivity
D.
Artificial radioactivity
Ans:
Nuclear fusion
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[20] The apparatus used to test acidity of aqueous solution is -
A.
pH meter
B.
Ammeter
C.
Hygrometer
D.
Acidmeter
Ans:
pH meter
Explanation :
A pH meter is an electronic device used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading.
[21] Chemical formula of washing soda is -
A.
Na2SO4.10H2O
B.
NaHCO3
C.
Na2CO3.10H2O
D.
Ca(OH)2
Ans:
Na2CO3.10H2O
Explanation :
Washing Soda is essentially Sodium Carbonate, a sodium salt of carbonic acid (soluble in water). The molecular formula of washing soda is Na2CO3.10H2O. It is used as an agent to soften hard water. It reacts with the calcium and magnesium bonds present in the water, enabling the detergent to work.
[22] Which one of the following elements is an example of noble gas?
A.
Nitrogen
B.
Hydrogen
C.
Chlorine
D.
Helium
Ans:
Helium
Explanation :
Noble gas refers to any of the seven chemical elements that make up Group Villa of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and element 118 (temporarily named ununoctium [Uuo]).
[23] Which of the following elements does not exhibit natural radioactivity?
A.
Uranium
B.
Thorium
C.
Aluminium
D.
Polonium
Ans:
Aluminium
Explanation :
Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust.
[24] Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
A.
Chlorofluorocarbons
B.
Nitrous oxide
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol.
[25] In which of the following states maximum iron ore is found?
A.
FeCO₃
B.
Fe₂O₃
C.
Fe₃O₄
D.
FeS₂
Ans:
Fe₂O₃
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red.
Explanation :
0
[12] Gamma rays are -
A.
High energy electrons
B.
Low energy electrons
C.
High energy electromagnetic
D.
High energy positron waves
Ans:
High energy electromagnetic
Explanation :
Gamma rays (γ) refer to electromagnetic radiation of an extremely high frequency and therefore consist of high energy photons.
[13] The name of unreactive gas is –
A.
Carbon dioxide
B.
Hydrogen
C.
Nitrogen
D.
Oxygen
Ans:
Nitrogen
Explanation :
Nitrogen is chemically unreactive because it has a strong triple bond which binds the two nitrogen atoms together making it harder for it to be broken. It does not burn, and at ordinary temperatures it does not react with other elements.
[14] Heavy water is so called because it contains -
A.
Heavy isotope of hydrogen
B.
Heavy isotope of oxygen
C.
Mole number of hydrogen atoms
D.
Mole number of oxygen atoms
Ans:
Heavy isotope of hydrogen
Explanation :
Heavy water, formally called deuterium oxide, is a form of "water that contains a larger than normal amount of the hydrogen isotope deuterium, (also known as "heavy hydrogen") rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water.
[15] Heating of a ore below its melting point in the absence of air is known as –
A.
Refining
B.
Calcination
C.
Roasting
D.
Smelting
Ans:
Calcination
Explanation :
Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of metal as well as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.
[16] The most electronegative element among the following is –
A.
Fluorine
B.
Sodium
C.
Chlorine
D.
Oxygen
Ans:
Fluorine
Explanation :
Electronegativity of the elements using the Pooling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[17] The quality of petrol is expressed in terms of –
A.
Cetane number
B.
Gold number
C.
Octane number
D.
Added unlead compounds
Ans:
Octane number
Explanation :
Octane rating or octane number is a standard measure of the of the ignition quality of has (gasoline or petrol). Higher this number, the less susceptible is the gas to `knocking' (explosion caused by its premature burning in the combustioncharnber) when burnt in a standard (spark-ignition internal combustion) engine.
[18] The percentage of Nitrogen in Air is -
A.
0.94
B.
0.03
C.
78.03
D.
85.02
Ans:
78.03
Explanation :
By volume, thy air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%.
[19] Energy is continuously generated in the sun due to _.
A.
Nuclear fusion
B.
Nuclear fission
C.
Radioactivity
D.
Artificial radioactivity
Ans:
Nuclear fusion
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[20] The apparatus used to test acidity of aqueous solution is -
A.
pH meter
B.
Ammeter
C.
Hygrometer
D.
Acidmeter
Ans:
pH meter
Explanation :
A pH meter is an electronic device used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading.
[21] Chemical formula of washing soda is -
A.
Na2SO4.10H2O
B.
NaHCO3
C.
Na2CO3.10H2O
D.
Ca(OH)2
Ans:
Na2CO3.10H2O
Explanation :
Washing Soda is essentially Sodium Carbonate, a sodium salt of carbonic acid (soluble in water). The molecular formula of washing soda is Na2CO3.10H2O. It is used as an agent to soften hard water. It reacts with the calcium and magnesium bonds present in the water, enabling the detergent to work.
[22] Which one of the following elements is an example of noble gas?
A.
Nitrogen
B.
Hydrogen
C.
Chlorine
D.
Helium
Ans:
Helium
Explanation :
Noble gas refers to any of the seven chemical elements that make up Group Villa of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and element 118 (temporarily named ununoctium [Uuo]).
[23] Which of the following elements does not exhibit natural radioactivity?
A.
Uranium
B.
Thorium
C.
Aluminium
D.
Polonium
Ans:
Aluminium
Explanation :
Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust.
[24] Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
A.
Chlorofluorocarbons
B.
Nitrous oxide
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol.
[25] In which of the following states maximum iron ore is found?
A.
FeCO₃
B.
Fe₂O₃
C.
Fe₃O₄
D.
FeS₂
Ans:
Fe₂O₃
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red.
Explanation :
Nitrogen is chemically unreactive because it has a strong triple bond which binds the two nitrogen atoms together making it harder for it to be broken. It does not burn, and at ordinary temperatures it does not react with other elements.
[14] Heavy water is so called because it contains -
A.
Heavy isotope of hydrogen
B.
Heavy isotope of oxygen
C.
Mole number of hydrogen atoms
D.
Mole number of oxygen atoms
Ans:
Heavy isotope of hydrogen
Explanation :
Heavy water, formally called deuterium oxide, is a form of "water that contains a larger than normal amount of the hydrogen isotope deuterium, (also known as "heavy hydrogen") rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water.
[15] Heating of a ore below its melting point in the absence of air is known as –
A.
Refining
B.
Calcination
C.
Roasting
D.
Smelting
Ans:
Calcination
Explanation :
Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of metal as well as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.
[16] The most electronegative element among the following is –
A.
Fluorine
B.
Sodium
C.
Chlorine
D.
Oxygen
Ans:
Fluorine
Explanation :
Electronegativity of the elements using the Pooling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[17] The quality of petrol is expressed in terms of –
A.
Cetane number
B.
Gold number
C.
Octane number
D.
Added unlead compounds
Ans:
Octane number
Explanation :
Octane rating or octane number is a standard measure of the of the ignition quality of has (gasoline or petrol). Higher this number, the less susceptible is the gas to `knocking' (explosion caused by its premature burning in the combustioncharnber) when burnt in a standard (spark-ignition internal combustion) engine.
[18] The percentage of Nitrogen in Air is -
A.
0.94
B.
0.03
C.
78.03
D.
85.02
Ans:
78.03
Explanation :
By volume, thy air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%.
[19] Energy is continuously generated in the sun due to _.
A.
Nuclear fusion
B.
Nuclear fission
C.
Radioactivity
D.
Artificial radioactivity
Ans:
Nuclear fusion
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[20] The apparatus used to test acidity of aqueous solution is -
A.
pH meter
B.
Ammeter
C.
Hygrometer
D.
Acidmeter
Ans:
pH meter
Explanation :
A pH meter is an electronic device used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading.
[21] Chemical formula of washing soda is -
A.
Na2SO4.10H2O
B.
NaHCO3
C.
Na2CO3.10H2O
D.
Ca(OH)2
Ans:
Na2CO3.10H2O
Explanation :
Washing Soda is essentially Sodium Carbonate, a sodium salt of carbonic acid (soluble in water). The molecular formula of washing soda is Na2CO3.10H2O. It is used as an agent to soften hard water. It reacts with the calcium and magnesium bonds present in the water, enabling the detergent to work.
[22] Which one of the following elements is an example of noble gas?
A.
Nitrogen
B.
Hydrogen
C.
Chlorine
D.
Helium
Ans:
Helium
Explanation :
Noble gas refers to any of the seven chemical elements that make up Group Villa of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and element 118 (temporarily named ununoctium [Uuo]).
[23] Which of the following elements does not exhibit natural radioactivity?
A.
Uranium
B.
Thorium
C.
Aluminium
D.
Polonium
Ans:
Aluminium
Explanation :
Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust.
[24] Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
A.
Chlorofluorocarbons
B.
Nitrous oxide
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol.
[25] In which of the following states maximum iron ore is found?
A.
FeCO₃
B.
Fe₂O₃
C.
Fe₃O₄
D.
FeS₂
Ans:
Fe₂O₃
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red.
Explanation :
Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of metal as well as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.
[16] The most electronegative element among the following is –
A.
Fluorine
B.
Sodium
C.
Chlorine
D.
Oxygen
Ans:
Fluorine
Explanation :
Electronegativity of the elements using the Pooling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[17] The quality of petrol is expressed in terms of –
A.
Cetane number
B.
Gold number
C.
Octane number
D.
Added unlead compounds
Ans:
Octane number
Explanation :
Octane rating or octane number is a standard measure of the of the ignition quality of has (gasoline or petrol). Higher this number, the less susceptible is the gas to `knocking' (explosion caused by its premature burning in the combustioncharnber) when burnt in a standard (spark-ignition internal combustion) engine.
[18] The percentage of Nitrogen in Air is -
A.
0.94
B.
0.03
C.
78.03
D.
85.02
Ans:
78.03
Explanation :
By volume, thy air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%.
[19] Energy is continuously generated in the sun due to _.
A.
Nuclear fusion
B.
Nuclear fission
C.
Radioactivity
D.
Artificial radioactivity
Ans:
Nuclear fusion
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[20] The apparatus used to test acidity of aqueous solution is -
A.
pH meter
B.
Ammeter
C.
Hygrometer
D.
Acidmeter
Ans:
pH meter
Explanation :
A pH meter is an electronic device used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading.
[21] Chemical formula of washing soda is -
A.
Na2SO4.10H2O
B.
NaHCO3
C.
Na2CO3.10H2O
D.
Ca(OH)2
Ans:
Na2CO3.10H2O
Explanation :
Washing Soda is essentially Sodium Carbonate, a sodium salt of carbonic acid (soluble in water). The molecular formula of washing soda is Na2CO3.10H2O. It is used as an agent to soften hard water. It reacts with the calcium and magnesium bonds present in the water, enabling the detergent to work.
[22] Which one of the following elements is an example of noble gas?
A.
Nitrogen
B.
Hydrogen
C.
Chlorine
D.
Helium
Ans:
Helium
Explanation :
Noble gas refers to any of the seven chemical elements that make up Group Villa of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and element 118 (temporarily named ununoctium [Uuo]).
[23] Which of the following elements does not exhibit natural radioactivity?
A.
Uranium
B.
Thorium
C.
Aluminium
D.
Polonium
Ans:
Aluminium
Explanation :
Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust.
[24] Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
A.
Chlorofluorocarbons
B.
Nitrous oxide
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol.
[25] In which of the following states maximum iron ore is found?
A.
FeCO₃
B.
Fe₂O₃
C.
Fe₃O₄
D.
FeS₂
Ans:
Fe₂O₃
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red.
Explanation :
Octane rating or octane number is a standard measure of the of the ignition quality of has (gasoline or petrol). Higher this number, the less susceptible is the gas to `knocking' (explosion caused by its premature burning in the combustioncharnber) when burnt in a standard (spark-ignition internal combustion) engine.
[18] The percentage of Nitrogen in Air is -
A.
0.94
B.
0.03
C.
78.03
D.
85.02
Ans:
78.03
Explanation :
By volume, thy air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%.
[19] Energy is continuously generated in the sun due to _.
A.
Nuclear fusion
B.
Nuclear fission
C.
Radioactivity
D.
Artificial radioactivity
Ans:
Nuclear fusion
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[20] The apparatus used to test acidity of aqueous solution is -
A.
pH meter
B.
Ammeter
C.
Hygrometer
D.
Acidmeter
Ans:
pH meter
Explanation :
A pH meter is an electronic device used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading.
[21] Chemical formula of washing soda is -
A.
Na2SO4.10H2O
B.
NaHCO3
C.
Na2CO3.10H2O
D.
Ca(OH)2
Ans:
Na2CO3.10H2O
Explanation :
Washing Soda is essentially Sodium Carbonate, a sodium salt of carbonic acid (soluble in water). The molecular formula of washing soda is Na2CO3.10H2O. It is used as an agent to soften hard water. It reacts with the calcium and magnesium bonds present in the water, enabling the detergent to work.
[22] Which one of the following elements is an example of noble gas?
A.
Nitrogen
B.
Hydrogen
C.
Chlorine
D.
Helium
Ans:
Helium
Explanation :
Noble gas refers to any of the seven chemical elements that make up Group Villa of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and element 118 (temporarily named ununoctium [Uuo]).
[23] Which of the following elements does not exhibit natural radioactivity?
A.
Uranium
B.
Thorium
C.
Aluminium
D.
Polonium
Ans:
Aluminium
Explanation :
Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust.
[24] Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
A.
Chlorofluorocarbons
B.
Nitrous oxide
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol.
[25] In which of the following states maximum iron ore is found?
A.
FeCO₃
B.
Fe₂O₃
C.
Fe₃O₄
D.
FeS₂
Ans:
Fe₂O₃
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red.
Explanation :
Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus.
[20] The apparatus used to test acidity of aqueous solution is -
A.
pH meter
B.
Ammeter
C.
Hygrometer
D.
Acidmeter
Ans:
pH meter
Explanation :
A pH meter is an electronic device used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading.
[21] Chemical formula of washing soda is -
A.
Na2SO4.10H2O
B.
NaHCO3
C.
Na2CO3.10H2O
D.
Ca(OH)2
Ans:
Na2CO3.10H2O
Explanation :
Washing Soda is essentially Sodium Carbonate, a sodium salt of carbonic acid (soluble in water). The molecular formula of washing soda is Na2CO3.10H2O. It is used as an agent to soften hard water. It reacts with the calcium and magnesium bonds present in the water, enabling the detergent to work.
[22] Which one of the following elements is an example of noble gas?
A.
Nitrogen
B.
Hydrogen
C.
Chlorine
D.
Helium
Ans:
Helium
Explanation :
Noble gas refers to any of the seven chemical elements that make up Group Villa of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and element 118 (temporarily named ununoctium [Uuo]).
[23] Which of the following elements does not exhibit natural radioactivity?
A.
Uranium
B.
Thorium
C.
Aluminium
D.
Polonium
Ans:
Aluminium
Explanation :
Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust.
[24] Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
A.
Chlorofluorocarbons
B.
Nitrous oxide
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol.
[25] In which of the following states maximum iron ore is found?
A.
FeCO₃
B.
Fe₂O₃
C.
Fe₃O₄
D.
FeS₂
Ans:
Fe₂O₃
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red.
Explanation :
Washing Soda is essentially Sodium Carbonate, a sodium salt of carbonic acid (soluble in water). The molecular formula of washing soda is Na2CO3.10H2O. It is used as an agent to soften hard water. It reacts with the calcium and magnesium bonds present in the water, enabling the detergent to work.
[22] Which one of the following elements is an example of noble gas?
A.
Nitrogen
B.
Hydrogen
C.
Chlorine
D.
Helium
Ans:
Helium
Explanation :
Noble gas refers to any of the seven chemical elements that make up Group Villa of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and element 118 (temporarily named ununoctium [Uuo]).
[23] Which of the following elements does not exhibit natural radioactivity?
A.
Uranium
B.
Thorium
C.
Aluminium
D.
Polonium
Ans:
Aluminium
Explanation :
Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust.
[24] Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
A.
Chlorofluorocarbons
B.
Nitrous oxide
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol.
[25] In which of the following states maximum iron ore is found?
A.
FeCO₃
B.
Fe₂O₃
C.
Fe₃O₄
D.
FeS₂
Ans:
Fe₂O₃
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red.
Explanation :
Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust.
[24] Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
A.
Chlorofluorocarbons
B.
Nitrous oxide
C.
Sulphur dioxide
D.
Carbon dioxide
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol.
[25] In which of the following states maximum iron ore is found?
A.
FeCO₃
B.
Fe₂O₃
C.
Fe₃O₄
D.
FeS₂
Ans:
Fe₂O₃
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red.
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red.