[1] Acids generate:
A.
Acids generate hydrogen ions.
B.
Bases generate hydroxide ions.
C.
Both are correct
D.
Both are incorrect
Ans:
Both are correct
Explanation :
Acids, in presence of water, give hydrogen ions (H+). Similarly, bases generate hydroxide (OH-) ions in water.
[2] Which one of the following is not a characteristic feature of alloys? They are –
A.
Compounds
B.
Mixtures
C.
Solutions
D.
Homogeneous systems
Ans:
Homogeneous systems
Explanation :
An alloy is a mixture or metallic solid solution composed of two or more elements. So they are heterogeneous systems. Complete solid solution alloys give single solid phase microstructure, while partial solutions give two or more phases that may or may not be homogeneous in distribution, depending on thermal (heat treatment) history. Alloys usually have different properties from those of the component elements.
[3] When iron rusts, its weight –
A.
decreases
B.
increases
C.
remains the same
D.
first increases and then decreases
Ans:
increases
Explanation :
When iron rusts, oxide compounds are formed due the interaction between oxygen in the air or in water and the metal. Because of the oxygen atoms binding with the metal, the weight of the metal with rust will increase.
[4] Nylon threads are made of -
A.
Polyester polymer
B.
Polyamide polymer
C.
Polyvinyl polymer
D.
Polysaccharide
Ans:
Polyamide polymer
Explanation :
Nylon is a generic designation for a family of synthetic polymers, more specifically aliphatic or semi- aromatic polyamides. They can be melt-processed into fibers, films or shapes. Nylon polymers have found significant commercial applications in fibers, in shapes and in films.
[5] The manufacturing of iron from ironore involves the process of -
A.
Oxidation
B.
Reduction
C.
Electrolysis
D.
Fractional distillation
Ans:
Reduction
Explanation :
Iron is extracted from iron ore in a huge container called a blast furnace. Iron ores such as hematite contain iron oxide. The oxygen must be removed from the iron oxide to leave the iron behind. Reactions in which oxygen is removed are called reduction reactions.
[6] Which one of the following elements is metalloid?
A.
Si
B.
Pb
C.
Ge
D.
C
Ans:
Ge
Explanation :
A metalloid is a chemical element with properties in between metals and nonmetals. Germanium (Ge) is a chemical element. It is a lustrous, hard, grayish-white metalloid in the carbon group.
[7] isotope is used in the treatment of which disease?
A.
Heart diseases
B.
cancer
C.
diabetes
D.
skin diseases
Ans:
cancer
Explanation :
In cobalt-60 therapy, cobalt-60-generated gamma radiation is used to destroy tumors. Cobalt-60 therapy is also known as Gamma Knife® therapy.
[8] Which one of the following is used in the preparation of antiseptic solution?
A.
Potassium nitrate
B.
Iodine
C.
Iodine chloride
D.
Potassium chloride
Ans:
Iodine
Explanation :
Antiseptics are chemical agents that slow or stop the growth of micro-organisms (germs) on external surfaces of the body and help prevent infections.
[9] The characteristic odour of garlic is due to -
A.
a chloro compound
B.
a sulphur compound
C.
a fluorine compound
D.
acetic acid
Ans:
a sulphur compound
Explanation :
The sulfur compounds in onions and garlic are called sulfites. These highly irritating chemicals can kill microbes and repel insects; prolonged contact with garlic will even blister the skin.
[10] An emulsion is a colloidal solution of -
A.
Liquid in liquid
B.
Solid in liquid
C.
Gas in solid
D.
Solid in Solid
Ans:
Liquid in liquid
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (unmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Examples of emulsions include vinaigrettes, homogenized milk, mayonnaise, and some cutting fluids for metal working.
[11] is a by product of sewage treatment and can be decomposed to produce biogas.
A.
Sewage
B.
Sludge
C.
Sewer
D.
Scum
Ans:
Sludge
Explanation :
Sludge refers to the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. It can be used to produce biogas through a process called anaerobic digestion or fermentation.
[12] Silver gets corroded due to in air.
A.
Oxygen
B.
Hydrogen Sulphide
C.
Carbon dioxide
D.
Nitrogen
Ans:
Hydrogen Sulphide
Explanation :
Silver is a fairly stable metal and under normal circumstances does not corrode quickly. However, it is particularly susceptible to the effects of the sulfide radical. However, when exposed to air, silver reacts with Hydrogen Sulphide in the atmosphere, especially in marine environment, and readily forms a surface tarnish of silver sulphide.
[13] Which of the following is a radioactive element?
A.
Cobalt
B.
Uranium
C.
Argon
D.
Chromium
Ans:
Uranium
Explanation :
Uranium (U) is a naturally occurring radioactive element. Its nucleus is unstable, so the element is in a constant state of decay, seeking a more stable arrangement. One of its isotopes, uranium-235, is the only naturally occurring isotope capable of sustaining a nuclear fission reaction. In fact, uranium was the element that made the discovery of radioactivity possible.
[14] Whatis Zeolite?
A.
Hydrated Aluminosilicate
B.
Hydrated Calcium Sulphate
C.
Dehydrated Aluminosilicate
D.
Dehydrated Calcium Sulphate
Ans:
Hydrated Aluminosilicate
Explanation :
Zeolites are hydrated aluminosilicate minerals made from interlinked tetrahedra of alumina (AlO4) and silica (SiO4). In simpler words, they're solids with a relatively open, three-dimensional crystal structure built from the elements aluminium, oxygen, and silicon, with alkali or alkaline-Earth metals (such as sodium, potassium, and magnesium) plus water molecules trapped in the gaps between them.
[15] L.P.G. is mostly liquefied
A.
hydrogen
B.
Oxygen
C.
butane
D.
methane
Ans:
butane
Explanation :
Liquefied petroleum gas or liquid petroleum gas (LPG) is mostly propane (C3H8), or butane (C4H10). They are most commonly mixtures of these two hydrocarbon gases that are used as fuel in heating appliances, cooking equipment, and vehicles. In the northern hemisphere winter, the mixes contain more propane, while in summer, they contain more butane.
[16] Which have the maximum density?
A.
Water
B.
Benzene
C.
Ice
D.
Chloroform
Ans:
Water
Explanation :
Water has its maximum density of 1g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3.
[17] Which of the following metals is stored in kerosene oil?
A.
Platinum
B.
Copper
C.
Sodium
D.
Gold
Ans:
Sodium
Explanation :
Owing to its extreme reactivity, sodium occurs in nature only combined in compounds never as a pure elemental metal.
[18] Atoms having the same number of protons but different number of neutrons are called :
A.
Isotopes
B.
Cations
C.
Higgs-boson
D.
Anions .
Ans:
Isotopes
Explanation :
Atoms that have the same number of protons but different numbers of neutrons are called isotopes. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively. The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively.
[19] Which one of the following elements is least likely to be found in commercial fertilisers?
A.
Nitrogen
B.
Phosphorus
C.
Potassium
D.
Silicon
Ans:
Silicon
Explanation :
Commercial Fertilizers - a substance containing one or more recognized plant nutrients and that is used for its plant nutrient content or that is designated for use or claimed to have value in promoting plant growth.
[20] Organic compounds are -
A.
Covalent compounds
B.
Ionic compounds
C.
Co-ordination compounds
D.
Interstitial compounds
Ans:
Covalent compounds
Explanation :
Organic compounds are always covalent compounds because it is more energetically favorable for carbon to covalently bond. Organic compounds, such as carbohydrates, lipids, proteins and nucleic acids, are all examples of covalent compounds.
[21] Which of the following is NOT a renewable source of energy?
A.
Wind energy
B.
Geothermal energy
C.
Energy from fossils
D.
Solar energy
Ans:
Energy from fossils
Explanation :
Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight wind, rain, tides, waves, and geothermal heat.
[22] Compounds of carbon having double or triple bonds between their carbon atoms are called -
A.
Saturated compounds
B.
Unsaturated compounds
C.
Reactive compounds
D.
None of the above
Ans:
Unsaturated compounds
Explanation :
Compounds of carbon, which are linked by only single bonds between the carbon atoms are called saturated compounds. Compounds of carbon having double or triple bonds between their carbon atoms are called unsaturated compounds.
[23] An alloy used in making heating elements for electric heating device is -
A.
Solder
B.
Alloy Steel
C.
Nichrome
D.
German Silver
Ans:
Nichrome
Explanation :
Nichrome is a mixture of chromium and nickel. Nichrome wire is a great conductor of electricity. Nichrome is used to make heating coils and other types of elements in household appliances.
[24] The degree of dissociation of an electrolyte depends on -
A.
dilution
B.
impurities
C.
atmospheric pressure
D.
method of dissolution
Ans:
dilution
Explanation :
The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (5) presence of other ions.
[25] Which of the following is present in Nail polish remover?
A.
Citric acid
B.
Acetone
C.
Ethylene
D.
Benzene
Ans:
Acetone
Explanation :
Acetone can also remove artificial nails made of acrylic or cured gel. An alternative nail polish remover is ethyl acetate, which often also contains isopropyl alcohol.
Explanation :
Acids, in presence of water, give hydrogen ions (H+). Similarly, bases generate hydroxide (OH-) ions in water.
[2] Which one of the following is not a characteristic feature of alloys? They are –
A.
Compounds
B.
Mixtures
C.
Solutions
D.
Homogeneous systems
Ans:
Homogeneous systems
Explanation :
An alloy is a mixture or metallic solid solution composed of two or more elements. So they are heterogeneous systems. Complete solid solution alloys give single solid phase microstructure, while partial solutions give two or more phases that may or may not be homogeneous in distribution, depending on thermal (heat treatment) history. Alloys usually have different properties from those of the component elements.
[3] When iron rusts, its weight –
A.
decreases
B.
increases
C.
remains the same
D.
first increases and then decreases
Ans:
increases
Explanation :
When iron rusts, oxide compounds are formed due the interaction between oxygen in the air or in water and the metal. Because of the oxygen atoms binding with the metal, the weight of the metal with rust will increase.
[4] Nylon threads are made of -
A.
Polyester polymer
B.
Polyamide polymer
C.
Polyvinyl polymer
D.
Polysaccharide
Ans:
Polyamide polymer
Explanation :
Nylon is a generic designation for a family of synthetic polymers, more specifically aliphatic or semi- aromatic polyamides. They can be melt-processed into fibers, films or shapes. Nylon polymers have found significant commercial applications in fibers, in shapes and in films.
[5] The manufacturing of iron from ironore involves the process of -
A.
Oxidation
B.
Reduction
C.
Electrolysis
D.
Fractional distillation
Ans:
Reduction
Explanation :
Iron is extracted from iron ore in a huge container called a blast furnace. Iron ores such as hematite contain iron oxide. The oxygen must be removed from the iron oxide to leave the iron behind. Reactions in which oxygen is removed are called reduction reactions.
[6] Which one of the following elements is metalloid?
A.
Si
B.
Pb
C.
Ge
D.
C
Ans:
Ge
Explanation :
A metalloid is a chemical element with properties in between metals and nonmetals. Germanium (Ge) is a chemical element. It is a lustrous, hard, grayish-white metalloid in the carbon group.
[7] isotope is used in the treatment of which disease?
A.
Heart diseases
B.
cancer
C.
diabetes
D.
skin diseases
Ans:
cancer
Explanation :
In cobalt-60 therapy, cobalt-60-generated gamma radiation is used to destroy tumors. Cobalt-60 therapy is also known as Gamma Knife® therapy.
[8] Which one of the following is used in the preparation of antiseptic solution?
A.
Potassium nitrate
B.
Iodine
C.
Iodine chloride
D.
Potassium chloride
Ans:
Iodine
Explanation :
Antiseptics are chemical agents that slow or stop the growth of micro-organisms (germs) on external surfaces of the body and help prevent infections.
[9] The characteristic odour of garlic is due to -
A.
a chloro compound
B.
a sulphur compound
C.
a fluorine compound
D.
acetic acid
Ans:
a sulphur compound
Explanation :
The sulfur compounds in onions and garlic are called sulfites. These highly irritating chemicals can kill microbes and repel insects; prolonged contact with garlic will even blister the skin.
[10] An emulsion is a colloidal solution of -
A.
Liquid in liquid
B.
Solid in liquid
C.
Gas in solid
D.
Solid in Solid
Ans:
Liquid in liquid
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (unmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Examples of emulsions include vinaigrettes, homogenized milk, mayonnaise, and some cutting fluids for metal working.
[11] is a by product of sewage treatment and can be decomposed to produce biogas.
A.
Sewage
B.
Sludge
C.
Sewer
D.
Scum
Ans:
Sludge
Explanation :
Sludge refers to the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. It can be used to produce biogas through a process called anaerobic digestion or fermentation.
[12] Silver gets corroded due to in air.
A.
Oxygen
B.
Hydrogen Sulphide
C.
Carbon dioxide
D.
Nitrogen
Ans:
Hydrogen Sulphide
Explanation :
Silver is a fairly stable metal and under normal circumstances does not corrode quickly. However, it is particularly susceptible to the effects of the sulfide radical. However, when exposed to air, silver reacts with Hydrogen Sulphide in the atmosphere, especially in marine environment, and readily forms a surface tarnish of silver sulphide.
[13] Which of the following is a radioactive element?
A.
Cobalt
B.
Uranium
C.
Argon
D.
Chromium
Ans:
Uranium
Explanation :
Uranium (U) is a naturally occurring radioactive element. Its nucleus is unstable, so the element is in a constant state of decay, seeking a more stable arrangement. One of its isotopes, uranium-235, is the only naturally occurring isotope capable of sustaining a nuclear fission reaction. In fact, uranium was the element that made the discovery of radioactivity possible.
[14] Whatis Zeolite?
A.
Hydrated Aluminosilicate
B.
Hydrated Calcium Sulphate
C.
Dehydrated Aluminosilicate
D.
Dehydrated Calcium Sulphate
Ans:
Hydrated Aluminosilicate
Explanation :
Zeolites are hydrated aluminosilicate minerals made from interlinked tetrahedra of alumina (AlO4) and silica (SiO4). In simpler words, they're solids with a relatively open, three-dimensional crystal structure built from the elements aluminium, oxygen, and silicon, with alkali or alkaline-Earth metals (such as sodium, potassium, and magnesium) plus water molecules trapped in the gaps between them.
[15] L.P.G. is mostly liquefied
A.
hydrogen
B.
Oxygen
C.
butane
D.
methane
Ans:
butane
Explanation :
Liquefied petroleum gas or liquid petroleum gas (LPG) is mostly propane (C3H8), or butane (C4H10). They are most commonly mixtures of these two hydrocarbon gases that are used as fuel in heating appliances, cooking equipment, and vehicles. In the northern hemisphere winter, the mixes contain more propane, while in summer, they contain more butane.
[16] Which have the maximum density?
A.
Water
B.
Benzene
C.
Ice
D.
Chloroform
Ans:
Water
Explanation :
Water has its maximum density of 1g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3.
[17] Which of the following metals is stored in kerosene oil?
A.
Platinum
B.
Copper
C.
Sodium
D.
Gold
Ans:
Sodium
Explanation :
Owing to its extreme reactivity, sodium occurs in nature only combined in compounds never as a pure elemental metal.
[18] Atoms having the same number of protons but different number of neutrons are called :
A.
Isotopes
B.
Cations
C.
Higgs-boson
D.
Anions .
Ans:
Isotopes
Explanation :
Atoms that have the same number of protons but different numbers of neutrons are called isotopes. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively. The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively.
[19] Which one of the following elements is least likely to be found in commercial fertilisers?
A.
Nitrogen
B.
Phosphorus
C.
Potassium
D.
Silicon
Ans:
Silicon
Explanation :
Commercial Fertilizers - a substance containing one or more recognized plant nutrients and that is used for its plant nutrient content or that is designated for use or claimed to have value in promoting plant growth.
[20] Organic compounds are -
A.
Covalent compounds
B.
Ionic compounds
C.
Co-ordination compounds
D.
Interstitial compounds
Ans:
Covalent compounds
Explanation :
Organic compounds are always covalent compounds because it is more energetically favorable for carbon to covalently bond. Organic compounds, such as carbohydrates, lipids, proteins and nucleic acids, are all examples of covalent compounds.
[21] Which of the following is NOT a renewable source of energy?
A.
Wind energy
B.
Geothermal energy
C.
Energy from fossils
D.
Solar energy
Ans:
Energy from fossils
Explanation :
Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight wind, rain, tides, waves, and geothermal heat.
[22] Compounds of carbon having double or triple bonds between their carbon atoms are called -
A.
Saturated compounds
B.
Unsaturated compounds
C.
Reactive compounds
D.
None of the above
Ans:
Unsaturated compounds
Explanation :
Compounds of carbon, which are linked by only single bonds between the carbon atoms are called saturated compounds. Compounds of carbon having double or triple bonds between their carbon atoms are called unsaturated compounds.
[23] An alloy used in making heating elements for electric heating device is -
A.
Solder
B.
Alloy Steel
C.
Nichrome
D.
German Silver
Ans:
Nichrome
Explanation :
Nichrome is a mixture of chromium and nickel. Nichrome wire is a great conductor of electricity. Nichrome is used to make heating coils and other types of elements in household appliances.
[24] The degree of dissociation of an electrolyte depends on -
A.
dilution
B.
impurities
C.
atmospheric pressure
D.
method of dissolution
Ans:
dilution
Explanation :
The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (5) presence of other ions.
[25] Which of the following is present in Nail polish remover?
A.
Citric acid
B.
Acetone
C.
Ethylene
D.
Benzene
Ans:
Acetone
Explanation :
Acetone can also remove artificial nails made of acrylic or cured gel. An alternative nail polish remover is ethyl acetate, which often also contains isopropyl alcohol.
Explanation :
When iron rusts, oxide compounds are formed due the interaction between oxygen in the air or in water and the metal. Because of the oxygen atoms binding with the metal, the weight of the metal with rust will increase.
[4] Nylon threads are made of -
A.
Polyester polymer
B.
Polyamide polymer
C.
Polyvinyl polymer
D.
Polysaccharide
Ans:
Polyamide polymer
Explanation :
Nylon is a generic designation for a family of synthetic polymers, more specifically aliphatic or semi- aromatic polyamides. They can be melt-processed into fibers, films or shapes. Nylon polymers have found significant commercial applications in fibers, in shapes and in films.
[5] The manufacturing of iron from ironore involves the process of -
A.
Oxidation
B.
Reduction
C.
Electrolysis
D.
Fractional distillation
Ans:
Reduction
Explanation :
Iron is extracted from iron ore in a huge container called a blast furnace. Iron ores such as hematite contain iron oxide. The oxygen must be removed from the iron oxide to leave the iron behind. Reactions in which oxygen is removed are called reduction reactions.
[6] Which one of the following elements is metalloid?
A.
Si
B.
Pb
C.
Ge
D.
C
Ans:
Ge
Explanation :
A metalloid is a chemical element with properties in between metals and nonmetals. Germanium (Ge) is a chemical element. It is a lustrous, hard, grayish-white metalloid in the carbon group.
[7] isotope is used in the treatment of which disease?
A.
Heart diseases
B.
cancer
C.
diabetes
D.
skin diseases
Ans:
cancer
Explanation :
In cobalt-60 therapy, cobalt-60-generated gamma radiation is used to destroy tumors. Cobalt-60 therapy is also known as Gamma Knife® therapy.
[8] Which one of the following is used in the preparation of antiseptic solution?
A.
Potassium nitrate
B.
Iodine
C.
Iodine chloride
D.
Potassium chloride
Ans:
Iodine
Explanation :
Antiseptics are chemical agents that slow or stop the growth of micro-organisms (germs) on external surfaces of the body and help prevent infections.
[9] The characteristic odour of garlic is due to -
A.
a chloro compound
B.
a sulphur compound
C.
a fluorine compound
D.
acetic acid
Ans:
a sulphur compound
Explanation :
The sulfur compounds in onions and garlic are called sulfites. These highly irritating chemicals can kill microbes and repel insects; prolonged contact with garlic will even blister the skin.
[10] An emulsion is a colloidal solution of -
A.
Liquid in liquid
B.
Solid in liquid
C.
Gas in solid
D.
Solid in Solid
Ans:
Liquid in liquid
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (unmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Examples of emulsions include vinaigrettes, homogenized milk, mayonnaise, and some cutting fluids for metal working.
[11] is a by product of sewage treatment and can be decomposed to produce biogas.
A.
Sewage
B.
Sludge
C.
Sewer
D.
Scum
Ans:
Sludge
Explanation :
Sludge refers to the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. It can be used to produce biogas through a process called anaerobic digestion or fermentation.
[12] Silver gets corroded due to in air.
A.
Oxygen
B.
Hydrogen Sulphide
C.
Carbon dioxide
D.
Nitrogen
Ans:
Hydrogen Sulphide
Explanation :
Silver is a fairly stable metal and under normal circumstances does not corrode quickly. However, it is particularly susceptible to the effects of the sulfide radical. However, when exposed to air, silver reacts with Hydrogen Sulphide in the atmosphere, especially in marine environment, and readily forms a surface tarnish of silver sulphide.
[13] Which of the following is a radioactive element?
A.
Cobalt
B.
Uranium
C.
Argon
D.
Chromium
Ans:
Uranium
Explanation :
Uranium (U) is a naturally occurring radioactive element. Its nucleus is unstable, so the element is in a constant state of decay, seeking a more stable arrangement. One of its isotopes, uranium-235, is the only naturally occurring isotope capable of sustaining a nuclear fission reaction. In fact, uranium was the element that made the discovery of radioactivity possible.
[14] Whatis Zeolite?
A.
Hydrated Aluminosilicate
B.
Hydrated Calcium Sulphate
C.
Dehydrated Aluminosilicate
D.
Dehydrated Calcium Sulphate
Ans:
Hydrated Aluminosilicate
Explanation :
Zeolites are hydrated aluminosilicate minerals made from interlinked tetrahedra of alumina (AlO4) and silica (SiO4). In simpler words, they're solids with a relatively open, three-dimensional crystal structure built from the elements aluminium, oxygen, and silicon, with alkali or alkaline-Earth metals (such as sodium, potassium, and magnesium) plus water molecules trapped in the gaps between them.
[15] L.P.G. is mostly liquefied
A.
hydrogen
B.
Oxygen
C.
butane
D.
methane
Ans:
butane
Explanation :
Liquefied petroleum gas or liquid petroleum gas (LPG) is mostly propane (C3H8), or butane (C4H10). They are most commonly mixtures of these two hydrocarbon gases that are used as fuel in heating appliances, cooking equipment, and vehicles. In the northern hemisphere winter, the mixes contain more propane, while in summer, they contain more butane.
[16] Which have the maximum density?
A.
Water
B.
Benzene
C.
Ice
D.
Chloroform
Ans:
Water
Explanation :
Water has its maximum density of 1g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3.
[17] Which of the following metals is stored in kerosene oil?
A.
Platinum
B.
Copper
C.
Sodium
D.
Gold
Ans:
Sodium
Explanation :
Owing to its extreme reactivity, sodium occurs in nature only combined in compounds never as a pure elemental metal.
[18] Atoms having the same number of protons but different number of neutrons are called :
A.
Isotopes
B.
Cations
C.
Higgs-boson
D.
Anions .
Ans:
Isotopes
Explanation :
Atoms that have the same number of protons but different numbers of neutrons are called isotopes. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively. The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively.
[19] Which one of the following elements is least likely to be found in commercial fertilisers?
A.
Nitrogen
B.
Phosphorus
C.
Potassium
D.
Silicon
Ans:
Silicon
Explanation :
Commercial Fertilizers - a substance containing one or more recognized plant nutrients and that is used for its plant nutrient content or that is designated for use or claimed to have value in promoting plant growth.
[20] Organic compounds are -
A.
Covalent compounds
B.
Ionic compounds
C.
Co-ordination compounds
D.
Interstitial compounds
Ans:
Covalent compounds
Explanation :
Organic compounds are always covalent compounds because it is more energetically favorable for carbon to covalently bond. Organic compounds, such as carbohydrates, lipids, proteins and nucleic acids, are all examples of covalent compounds.
[21] Which of the following is NOT a renewable source of energy?
A.
Wind energy
B.
Geothermal energy
C.
Energy from fossils
D.
Solar energy
Ans:
Energy from fossils
Explanation :
Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight wind, rain, tides, waves, and geothermal heat.
[22] Compounds of carbon having double or triple bonds between their carbon atoms are called -
A.
Saturated compounds
B.
Unsaturated compounds
C.
Reactive compounds
D.
None of the above
Ans:
Unsaturated compounds
Explanation :
Compounds of carbon, which are linked by only single bonds between the carbon atoms are called saturated compounds. Compounds of carbon having double or triple bonds between their carbon atoms are called unsaturated compounds.
[23] An alloy used in making heating elements for electric heating device is -
A.
Solder
B.
Alloy Steel
C.
Nichrome
D.
German Silver
Ans:
Nichrome
Explanation :
Nichrome is a mixture of chromium and nickel. Nichrome wire is a great conductor of electricity. Nichrome is used to make heating coils and other types of elements in household appliances.
[24] The degree of dissociation of an electrolyte depends on -
A.
dilution
B.
impurities
C.
atmospheric pressure
D.
method of dissolution
Ans:
dilution
Explanation :
The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (5) presence of other ions.
[25] Which of the following is present in Nail polish remover?
A.
Citric acid
B.
Acetone
C.
Ethylene
D.
Benzene
Ans:
Acetone
Explanation :
Acetone can also remove artificial nails made of acrylic or cured gel. An alternative nail polish remover is ethyl acetate, which often also contains isopropyl alcohol.
Explanation :
Iron is extracted from iron ore in a huge container called a blast furnace. Iron ores such as hematite contain iron oxide. The oxygen must be removed from the iron oxide to leave the iron behind. Reactions in which oxygen is removed are called reduction reactions.
[6] Which one of the following elements is metalloid?
A.
Si
B.
Pb
C.
Ge
D.
C
Ans:
Ge
Explanation :
A metalloid is a chemical element with properties in between metals and nonmetals. Germanium (Ge) is a chemical element. It is a lustrous, hard, grayish-white metalloid in the carbon group.
[7] isotope is used in the treatment of which disease?
A.
Heart diseases
B.
cancer
C.
diabetes
D.
skin diseases
Ans:
cancer
Explanation :
In cobalt-60 therapy, cobalt-60-generated gamma radiation is used to destroy tumors. Cobalt-60 therapy is also known as Gamma Knife® therapy.
[8] Which one of the following is used in the preparation of antiseptic solution?
A.
Potassium nitrate
B.
Iodine
C.
Iodine chloride
D.
Potassium chloride
Ans:
Iodine
Explanation :
Antiseptics are chemical agents that slow or stop the growth of micro-organisms (germs) on external surfaces of the body and help prevent infections.
[9] The characteristic odour of garlic is due to -
A.
a chloro compound
B.
a sulphur compound
C.
a fluorine compound
D.
acetic acid
Ans:
a sulphur compound
Explanation :
The sulfur compounds in onions and garlic are called sulfites. These highly irritating chemicals can kill microbes and repel insects; prolonged contact with garlic will even blister the skin.
[10] An emulsion is a colloidal solution of -
A.
Liquid in liquid
B.
Solid in liquid
C.
Gas in solid
D.
Solid in Solid
Ans:
Liquid in liquid
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (unmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Examples of emulsions include vinaigrettes, homogenized milk, mayonnaise, and some cutting fluids for metal working.
[11] is a by product of sewage treatment and can be decomposed to produce biogas.
A.
Sewage
B.
Sludge
C.
Sewer
D.
Scum
Ans:
Sludge
Explanation :
Sludge refers to the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. It can be used to produce biogas through a process called anaerobic digestion or fermentation.
[12] Silver gets corroded due to in air.
A.
Oxygen
B.
Hydrogen Sulphide
C.
Carbon dioxide
D.
Nitrogen
Ans:
Hydrogen Sulphide
Explanation :
Silver is a fairly stable metal and under normal circumstances does not corrode quickly. However, it is particularly susceptible to the effects of the sulfide radical. However, when exposed to air, silver reacts with Hydrogen Sulphide in the atmosphere, especially in marine environment, and readily forms a surface tarnish of silver sulphide.
[13] Which of the following is a radioactive element?
A.
Cobalt
B.
Uranium
C.
Argon
D.
Chromium
Ans:
Uranium
Explanation :
Uranium (U) is a naturally occurring radioactive element. Its nucleus is unstable, so the element is in a constant state of decay, seeking a more stable arrangement. One of its isotopes, uranium-235, is the only naturally occurring isotope capable of sustaining a nuclear fission reaction. In fact, uranium was the element that made the discovery of radioactivity possible.
[14] Whatis Zeolite?
A.
Hydrated Aluminosilicate
B.
Hydrated Calcium Sulphate
C.
Dehydrated Aluminosilicate
D.
Dehydrated Calcium Sulphate
Ans:
Hydrated Aluminosilicate
Explanation :
Zeolites are hydrated aluminosilicate minerals made from interlinked tetrahedra of alumina (AlO4) and silica (SiO4). In simpler words, they're solids with a relatively open, three-dimensional crystal structure built from the elements aluminium, oxygen, and silicon, with alkali or alkaline-Earth metals (such as sodium, potassium, and magnesium) plus water molecules trapped in the gaps between them.
[15] L.P.G. is mostly liquefied
A.
hydrogen
B.
Oxygen
C.
butane
D.
methane
Ans:
butane
Explanation :
Liquefied petroleum gas or liquid petroleum gas (LPG) is mostly propane (C3H8), or butane (C4H10). They are most commonly mixtures of these two hydrocarbon gases that are used as fuel in heating appliances, cooking equipment, and vehicles. In the northern hemisphere winter, the mixes contain more propane, while in summer, they contain more butane.
[16] Which have the maximum density?
A.
Water
B.
Benzene
C.
Ice
D.
Chloroform
Ans:
Water
Explanation :
Water has its maximum density of 1g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3.
[17] Which of the following metals is stored in kerosene oil?
A.
Platinum
B.
Copper
C.
Sodium
D.
Gold
Ans:
Sodium
Explanation :
Owing to its extreme reactivity, sodium occurs in nature only combined in compounds never as a pure elemental metal.
[18] Atoms having the same number of protons but different number of neutrons are called :
A.
Isotopes
B.
Cations
C.
Higgs-boson
D.
Anions .
Ans:
Isotopes
Explanation :
Atoms that have the same number of protons but different numbers of neutrons are called isotopes. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively. The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively.
[19] Which one of the following elements is least likely to be found in commercial fertilisers?
A.
Nitrogen
B.
Phosphorus
C.
Potassium
D.
Silicon
Ans:
Silicon
Explanation :
Commercial Fertilizers - a substance containing one or more recognized plant nutrients and that is used for its plant nutrient content or that is designated for use or claimed to have value in promoting plant growth.
[20] Organic compounds are -
A.
Covalent compounds
B.
Ionic compounds
C.
Co-ordination compounds
D.
Interstitial compounds
Ans:
Covalent compounds
Explanation :
Organic compounds are always covalent compounds because it is more energetically favorable for carbon to covalently bond. Organic compounds, such as carbohydrates, lipids, proteins and nucleic acids, are all examples of covalent compounds.
[21] Which of the following is NOT a renewable source of energy?
A.
Wind energy
B.
Geothermal energy
C.
Energy from fossils
D.
Solar energy
Ans:
Energy from fossils
Explanation :
Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight wind, rain, tides, waves, and geothermal heat.
[22] Compounds of carbon having double or triple bonds between their carbon atoms are called -
A.
Saturated compounds
B.
Unsaturated compounds
C.
Reactive compounds
D.
None of the above
Ans:
Unsaturated compounds
Explanation :
Compounds of carbon, which are linked by only single bonds between the carbon atoms are called saturated compounds. Compounds of carbon having double or triple bonds between their carbon atoms are called unsaturated compounds.
[23] An alloy used in making heating elements for electric heating device is -
A.
Solder
B.
Alloy Steel
C.
Nichrome
D.
German Silver
Ans:
Nichrome
Explanation :
Nichrome is a mixture of chromium and nickel. Nichrome wire is a great conductor of electricity. Nichrome is used to make heating coils and other types of elements in household appliances.
[24] The degree of dissociation of an electrolyte depends on -
A.
dilution
B.
impurities
C.
atmospheric pressure
D.
method of dissolution
Ans:
dilution
Explanation :
The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (5) presence of other ions.
[25] Which of the following is present in Nail polish remover?
A.
Citric acid
B.
Acetone
C.
Ethylene
D.
Benzene
Ans:
Acetone
Explanation :
Acetone can also remove artificial nails made of acrylic or cured gel. An alternative nail polish remover is ethyl acetate, which often also contains isopropyl alcohol.
Explanation :
In cobalt-60 therapy, cobalt-60-generated gamma radiation is used to destroy tumors. Cobalt-60 therapy is also known as Gamma Knife® therapy.
[8] Which one of the following is used in the preparation of antiseptic solution?
A.
Potassium nitrate
B.
Iodine
C.
Iodine chloride
D.
Potassium chloride
Ans:
Iodine
Explanation :
Antiseptics are chemical agents that slow or stop the growth of micro-organisms (germs) on external surfaces of the body and help prevent infections.
[9] The characteristic odour of garlic is due to -
A.
a chloro compound
B.
a sulphur compound
C.
a fluorine compound
D.
acetic acid
Ans:
a sulphur compound
Explanation :
The sulfur compounds in onions and garlic are called sulfites. These highly irritating chemicals can kill microbes and repel insects; prolonged contact with garlic will even blister the skin.
[10] An emulsion is a colloidal solution of -
A.
Liquid in liquid
B.
Solid in liquid
C.
Gas in solid
D.
Solid in Solid
Ans:
Liquid in liquid
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (unmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Examples of emulsions include vinaigrettes, homogenized milk, mayonnaise, and some cutting fluids for metal working.
[11] is a by product of sewage treatment and can be decomposed to produce biogas.
A.
Sewage
B.
Sludge
C.
Sewer
D.
Scum
Ans:
Sludge
Explanation :
Sludge refers to the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. It can be used to produce biogas through a process called anaerobic digestion or fermentation.
[12] Silver gets corroded due to in air.
A.
Oxygen
B.
Hydrogen Sulphide
C.
Carbon dioxide
D.
Nitrogen
Ans:
Hydrogen Sulphide
Explanation :
Silver is a fairly stable metal and under normal circumstances does not corrode quickly. However, it is particularly susceptible to the effects of the sulfide radical. However, when exposed to air, silver reacts with Hydrogen Sulphide in the atmosphere, especially in marine environment, and readily forms a surface tarnish of silver sulphide.
[13] Which of the following is a radioactive element?
A.
Cobalt
B.
Uranium
C.
Argon
D.
Chromium
Ans:
Uranium
Explanation :
Uranium (U) is a naturally occurring radioactive element. Its nucleus is unstable, so the element is in a constant state of decay, seeking a more stable arrangement. One of its isotopes, uranium-235, is the only naturally occurring isotope capable of sustaining a nuclear fission reaction. In fact, uranium was the element that made the discovery of radioactivity possible.
[14] Whatis Zeolite?
A.
Hydrated Aluminosilicate
B.
Hydrated Calcium Sulphate
C.
Dehydrated Aluminosilicate
D.
Dehydrated Calcium Sulphate
Ans:
Hydrated Aluminosilicate
Explanation :
Zeolites are hydrated aluminosilicate minerals made from interlinked tetrahedra of alumina (AlO4) and silica (SiO4). In simpler words, they're solids with a relatively open, three-dimensional crystal structure built from the elements aluminium, oxygen, and silicon, with alkali or alkaline-Earth metals (such as sodium, potassium, and magnesium) plus water molecules trapped in the gaps between them.
[15] L.P.G. is mostly liquefied
A.
hydrogen
B.
Oxygen
C.
butane
D.
methane
Ans:
butane
Explanation :
Liquefied petroleum gas or liquid petroleum gas (LPG) is mostly propane (C3H8), or butane (C4H10). They are most commonly mixtures of these two hydrocarbon gases that are used as fuel in heating appliances, cooking equipment, and vehicles. In the northern hemisphere winter, the mixes contain more propane, while in summer, they contain more butane.
[16] Which have the maximum density?
A.
Water
B.
Benzene
C.
Ice
D.
Chloroform
Ans:
Water
Explanation :
Water has its maximum density of 1g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3.
[17] Which of the following metals is stored in kerosene oil?
A.
Platinum
B.
Copper
C.
Sodium
D.
Gold
Ans:
Sodium
Explanation :
Owing to its extreme reactivity, sodium occurs in nature only combined in compounds never as a pure elemental metal.
[18] Atoms having the same number of protons but different number of neutrons are called :
A.
Isotopes
B.
Cations
C.
Higgs-boson
D.
Anions .
Ans:
Isotopes
Explanation :
Atoms that have the same number of protons but different numbers of neutrons are called isotopes. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively. The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively.
[19] Which one of the following elements is least likely to be found in commercial fertilisers?
A.
Nitrogen
B.
Phosphorus
C.
Potassium
D.
Silicon
Ans:
Silicon
Explanation :
Commercial Fertilizers - a substance containing one or more recognized plant nutrients and that is used for its plant nutrient content or that is designated for use or claimed to have value in promoting plant growth.
[20] Organic compounds are -
A.
Covalent compounds
B.
Ionic compounds
C.
Co-ordination compounds
D.
Interstitial compounds
Ans:
Covalent compounds
Explanation :
Organic compounds are always covalent compounds because it is more energetically favorable for carbon to covalently bond. Organic compounds, such as carbohydrates, lipids, proteins and nucleic acids, are all examples of covalent compounds.
[21] Which of the following is NOT a renewable source of energy?
A.
Wind energy
B.
Geothermal energy
C.
Energy from fossils
D.
Solar energy
Ans:
Energy from fossils
Explanation :
Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight wind, rain, tides, waves, and geothermal heat.
[22] Compounds of carbon having double or triple bonds between their carbon atoms are called -
A.
Saturated compounds
B.
Unsaturated compounds
C.
Reactive compounds
D.
None of the above
Ans:
Unsaturated compounds
Explanation :
Compounds of carbon, which are linked by only single bonds between the carbon atoms are called saturated compounds. Compounds of carbon having double or triple bonds between their carbon atoms are called unsaturated compounds.
[23] An alloy used in making heating elements for electric heating device is -
A.
Solder
B.
Alloy Steel
C.
Nichrome
D.
German Silver
Ans:
Nichrome
Explanation :
Nichrome is a mixture of chromium and nickel. Nichrome wire is a great conductor of electricity. Nichrome is used to make heating coils and other types of elements in household appliances.
[24] The degree of dissociation of an electrolyte depends on -
A.
dilution
B.
impurities
C.
atmospheric pressure
D.
method of dissolution
Ans:
dilution
Explanation :
The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (5) presence of other ions.
[25] Which of the following is present in Nail polish remover?
A.
Citric acid
B.
Acetone
C.
Ethylene
D.
Benzene
Ans:
Acetone
Explanation :
Acetone can also remove artificial nails made of acrylic or cured gel. An alternative nail polish remover is ethyl acetate, which often also contains isopropyl alcohol.
Explanation :
The sulfur compounds in onions and garlic are called sulfites. These highly irritating chemicals can kill microbes and repel insects; prolonged contact with garlic will even blister the skin.
[10] An emulsion is a colloidal solution of -
A.
Liquid in liquid
B.
Solid in liquid
C.
Gas in solid
D.
Solid in Solid
Ans:
Liquid in liquid
Explanation :
An emulsion is a mixture of two or more liquids that are normally immiscible (unmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Examples of emulsions include vinaigrettes, homogenized milk, mayonnaise, and some cutting fluids for metal working.
[11] is a by product of sewage treatment and can be decomposed to produce biogas.
A.
Sewage
B.
Sludge
C.
Sewer
D.
Scum
Ans:
Sludge
Explanation :
Sludge refers to the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. It can be used to produce biogas through a process called anaerobic digestion or fermentation.
[12] Silver gets corroded due to in air.
A.
Oxygen
B.
Hydrogen Sulphide
C.
Carbon dioxide
D.
Nitrogen
Ans:
Hydrogen Sulphide
Explanation :
Silver is a fairly stable metal and under normal circumstances does not corrode quickly. However, it is particularly susceptible to the effects of the sulfide radical. However, when exposed to air, silver reacts with Hydrogen Sulphide in the atmosphere, especially in marine environment, and readily forms a surface tarnish of silver sulphide.
[13] Which of the following is a radioactive element?
A.
Cobalt
B.
Uranium
C.
Argon
D.
Chromium
Ans:
Uranium
Explanation :
Uranium (U) is a naturally occurring radioactive element. Its nucleus is unstable, so the element is in a constant state of decay, seeking a more stable arrangement. One of its isotopes, uranium-235, is the only naturally occurring isotope capable of sustaining a nuclear fission reaction. In fact, uranium was the element that made the discovery of radioactivity possible.
[14] Whatis Zeolite?
A.
Hydrated Aluminosilicate
B.
Hydrated Calcium Sulphate
C.
Dehydrated Aluminosilicate
D.
Dehydrated Calcium Sulphate
Ans:
Hydrated Aluminosilicate
Explanation :
Zeolites are hydrated aluminosilicate minerals made from interlinked tetrahedra of alumina (AlO4) and silica (SiO4). In simpler words, they're solids with a relatively open, three-dimensional crystal structure built from the elements aluminium, oxygen, and silicon, with alkali or alkaline-Earth metals (such as sodium, potassium, and magnesium) plus water molecules trapped in the gaps between them.
[15] L.P.G. is mostly liquefied
A.
hydrogen
B.
Oxygen
C.
butane
D.
methane
Ans:
butane
Explanation :
Liquefied petroleum gas or liquid petroleum gas (LPG) is mostly propane (C3H8), or butane (C4H10). They are most commonly mixtures of these two hydrocarbon gases that are used as fuel in heating appliances, cooking equipment, and vehicles. In the northern hemisphere winter, the mixes contain more propane, while in summer, they contain more butane.
[16] Which have the maximum density?
A.
Water
B.
Benzene
C.
Ice
D.
Chloroform
Ans:
Water
Explanation :
Water has its maximum density of 1g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3.
[17] Which of the following metals is stored in kerosene oil?
A.
Platinum
B.
Copper
C.
Sodium
D.
Gold
Ans:
Sodium
Explanation :
Owing to its extreme reactivity, sodium occurs in nature only combined in compounds never as a pure elemental metal.
[18] Atoms having the same number of protons but different number of neutrons are called :
A.
Isotopes
B.
Cations
C.
Higgs-boson
D.
Anions .
Ans:
Isotopes
Explanation :
Atoms that have the same number of protons but different numbers of neutrons are called isotopes. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively. The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively.
[19] Which one of the following elements is least likely to be found in commercial fertilisers?
A.
Nitrogen
B.
Phosphorus
C.
Potassium
D.
Silicon
Ans:
Silicon
Explanation :
Commercial Fertilizers - a substance containing one or more recognized plant nutrients and that is used for its plant nutrient content or that is designated for use or claimed to have value in promoting plant growth.
[20] Organic compounds are -
A.
Covalent compounds
B.
Ionic compounds
C.
Co-ordination compounds
D.
Interstitial compounds
Ans:
Covalent compounds
Explanation :
Organic compounds are always covalent compounds because it is more energetically favorable for carbon to covalently bond. Organic compounds, such as carbohydrates, lipids, proteins and nucleic acids, are all examples of covalent compounds.
[21] Which of the following is NOT a renewable source of energy?
A.
Wind energy
B.
Geothermal energy
C.
Energy from fossils
D.
Solar energy
Ans:
Energy from fossils
Explanation :
Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight wind, rain, tides, waves, and geothermal heat.
[22] Compounds of carbon having double or triple bonds between their carbon atoms are called -
A.
Saturated compounds
B.
Unsaturated compounds
C.
Reactive compounds
D.
None of the above
Ans:
Unsaturated compounds
Explanation :
Compounds of carbon, which are linked by only single bonds between the carbon atoms are called saturated compounds. Compounds of carbon having double or triple bonds between their carbon atoms are called unsaturated compounds.
[23] An alloy used in making heating elements for electric heating device is -
A.
Solder
B.
Alloy Steel
C.
Nichrome
D.
German Silver
Ans:
Nichrome
Explanation :
Nichrome is a mixture of chromium and nickel. Nichrome wire is a great conductor of electricity. Nichrome is used to make heating coils and other types of elements in household appliances.
[24] The degree of dissociation of an electrolyte depends on -
A.
dilution
B.
impurities
C.
atmospheric pressure
D.
method of dissolution
Ans:
dilution
Explanation :
The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (5) presence of other ions.
[25] Which of the following is present in Nail polish remover?
A.
Citric acid
B.
Acetone
C.
Ethylene
D.
Benzene
Ans:
Acetone
Explanation :
Acetone can also remove artificial nails made of acrylic or cured gel. An alternative nail polish remover is ethyl acetate, which often also contains isopropyl alcohol.
Explanation :
Sludge refers to the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. It can be used to produce biogas through a process called anaerobic digestion or fermentation.
[12] Silver gets corroded due to in air.
A.
Oxygen
B.
Hydrogen Sulphide
C.
Carbon dioxide
D.
Nitrogen
Ans:
Hydrogen Sulphide
Explanation :
Silver is a fairly stable metal and under normal circumstances does not corrode quickly. However, it is particularly susceptible to the effects of the sulfide radical. However, when exposed to air, silver reacts with Hydrogen Sulphide in the atmosphere, especially in marine environment, and readily forms a surface tarnish of silver sulphide.
[13] Which of the following is a radioactive element?
A.
Cobalt
B.
Uranium
C.
Argon
D.
Chromium
Ans:
Uranium
Explanation :
Uranium (U) is a naturally occurring radioactive element. Its nucleus is unstable, so the element is in a constant state of decay, seeking a more stable arrangement. One of its isotopes, uranium-235, is the only naturally occurring isotope capable of sustaining a nuclear fission reaction. In fact, uranium was the element that made the discovery of radioactivity possible.
[14] Whatis Zeolite?
A.
Hydrated Aluminosilicate
B.
Hydrated Calcium Sulphate
C.
Dehydrated Aluminosilicate
D.
Dehydrated Calcium Sulphate
Ans:
Hydrated Aluminosilicate
Explanation :
Zeolites are hydrated aluminosilicate minerals made from interlinked tetrahedra of alumina (AlO4) and silica (SiO4). In simpler words, they're solids with a relatively open, three-dimensional crystal structure built from the elements aluminium, oxygen, and silicon, with alkali or alkaline-Earth metals (such as sodium, potassium, and magnesium) plus water molecules trapped in the gaps between them.
[15] L.P.G. is mostly liquefied
A.
hydrogen
B.
Oxygen
C.
butane
D.
methane
Ans:
butane
Explanation :
Liquefied petroleum gas or liquid petroleum gas (LPG) is mostly propane (C3H8), or butane (C4H10). They are most commonly mixtures of these two hydrocarbon gases that are used as fuel in heating appliances, cooking equipment, and vehicles. In the northern hemisphere winter, the mixes contain more propane, while in summer, they contain more butane.
[16] Which have the maximum density?
A.
Water
B.
Benzene
C.
Ice
D.
Chloroform
Ans:
Water
Explanation :
Water has its maximum density of 1g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3.
[17] Which of the following metals is stored in kerosene oil?
A.
Platinum
B.
Copper
C.
Sodium
D.
Gold
Ans:
Sodium
Explanation :
Owing to its extreme reactivity, sodium occurs in nature only combined in compounds never as a pure elemental metal.
[18] Atoms having the same number of protons but different number of neutrons are called :
A.
Isotopes
B.
Cations
C.
Higgs-boson
D.
Anions .
Ans:
Isotopes
Explanation :
Atoms that have the same number of protons but different numbers of neutrons are called isotopes. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively. The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively.
[19] Which one of the following elements is least likely to be found in commercial fertilisers?
A.
Nitrogen
B.
Phosphorus
C.
Potassium
D.
Silicon
Ans:
Silicon
Explanation :
Commercial Fertilizers - a substance containing one or more recognized plant nutrients and that is used for its plant nutrient content or that is designated for use or claimed to have value in promoting plant growth.
[20] Organic compounds are -
A.
Covalent compounds
B.
Ionic compounds
C.
Co-ordination compounds
D.
Interstitial compounds
Ans:
Covalent compounds
Explanation :
Organic compounds are always covalent compounds because it is more energetically favorable for carbon to covalently bond. Organic compounds, such as carbohydrates, lipids, proteins and nucleic acids, are all examples of covalent compounds.
[21] Which of the following is NOT a renewable source of energy?
A.
Wind energy
B.
Geothermal energy
C.
Energy from fossils
D.
Solar energy
Ans:
Energy from fossils
Explanation :
Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight wind, rain, tides, waves, and geothermal heat.
[22] Compounds of carbon having double or triple bonds between their carbon atoms are called -
A.
Saturated compounds
B.
Unsaturated compounds
C.
Reactive compounds
D.
None of the above
Ans:
Unsaturated compounds
Explanation :
Compounds of carbon, which are linked by only single bonds between the carbon atoms are called saturated compounds. Compounds of carbon having double or triple bonds between their carbon atoms are called unsaturated compounds.
[23] An alloy used in making heating elements for electric heating device is -
A.
Solder
B.
Alloy Steel
C.
Nichrome
D.
German Silver
Ans:
Nichrome
Explanation :
Nichrome is a mixture of chromium and nickel. Nichrome wire is a great conductor of electricity. Nichrome is used to make heating coils and other types of elements in household appliances.
[24] The degree of dissociation of an electrolyte depends on -
A.
dilution
B.
impurities
C.
atmospheric pressure
D.
method of dissolution
Ans:
dilution
Explanation :
The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (5) presence of other ions.
[25] Which of the following is present in Nail polish remover?
A.
Citric acid
B.
Acetone
C.
Ethylene
D.
Benzene
Ans:
Acetone
Explanation :
Acetone can also remove artificial nails made of acrylic or cured gel. An alternative nail polish remover is ethyl acetate, which often also contains isopropyl alcohol.
Explanation :
Uranium (U) is a naturally occurring radioactive element. Its nucleus is unstable, so the element is in a constant state of decay, seeking a more stable arrangement. One of its isotopes, uranium-235, is the only naturally occurring isotope capable of sustaining a nuclear fission reaction. In fact, uranium was the element that made the discovery of radioactivity possible.
[14] Whatis Zeolite?
A.
Hydrated Aluminosilicate
B.
Hydrated Calcium Sulphate
C.
Dehydrated Aluminosilicate
D.
Dehydrated Calcium Sulphate
Ans:
Hydrated Aluminosilicate
Explanation :
Zeolites are hydrated aluminosilicate minerals made from interlinked tetrahedra of alumina (AlO4) and silica (SiO4). In simpler words, they're solids with a relatively open, three-dimensional crystal structure built from the elements aluminium, oxygen, and silicon, with alkali or alkaline-Earth metals (such as sodium, potassium, and magnesium) plus water molecules trapped in the gaps between them.
[15] L.P.G. is mostly liquefied
A.
hydrogen
B.
Oxygen
C.
butane
D.
methane
Ans:
butane
Explanation :
Liquefied petroleum gas or liquid petroleum gas (LPG) is mostly propane (C3H8), or butane (C4H10). They are most commonly mixtures of these two hydrocarbon gases that are used as fuel in heating appliances, cooking equipment, and vehicles. In the northern hemisphere winter, the mixes contain more propane, while in summer, they contain more butane.
[16] Which have the maximum density?
A.
Water
B.
Benzene
C.
Ice
D.
Chloroform
Ans:
Water
Explanation :
Water has its maximum density of 1g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3.
[17] Which of the following metals is stored in kerosene oil?
A.
Platinum
B.
Copper
C.
Sodium
D.
Gold
Ans:
Sodium
Explanation :
Owing to its extreme reactivity, sodium occurs in nature only combined in compounds never as a pure elemental metal.
[18] Atoms having the same number of protons but different number of neutrons are called :
A.
Isotopes
B.
Cations
C.
Higgs-boson
D.
Anions .
Ans:
Isotopes
Explanation :
Atoms that have the same number of protons but different numbers of neutrons are called isotopes. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively. The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively.
[19] Which one of the following elements is least likely to be found in commercial fertilisers?
A.
Nitrogen
B.
Phosphorus
C.
Potassium
D.
Silicon
Ans:
Silicon
Explanation :
Commercial Fertilizers - a substance containing one or more recognized plant nutrients and that is used for its plant nutrient content or that is designated for use or claimed to have value in promoting plant growth.
[20] Organic compounds are -
A.
Covalent compounds
B.
Ionic compounds
C.
Co-ordination compounds
D.
Interstitial compounds
Ans:
Covalent compounds
Explanation :
Organic compounds are always covalent compounds because it is more energetically favorable for carbon to covalently bond. Organic compounds, such as carbohydrates, lipids, proteins and nucleic acids, are all examples of covalent compounds.
[21] Which of the following is NOT a renewable source of energy?
A.
Wind energy
B.
Geothermal energy
C.
Energy from fossils
D.
Solar energy
Ans:
Energy from fossils
Explanation :
Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight wind, rain, tides, waves, and geothermal heat.
[22] Compounds of carbon having double or triple bonds between their carbon atoms are called -
A.
Saturated compounds
B.
Unsaturated compounds
C.
Reactive compounds
D.
None of the above
Ans:
Unsaturated compounds
Explanation :
Compounds of carbon, which are linked by only single bonds between the carbon atoms are called saturated compounds. Compounds of carbon having double or triple bonds between their carbon atoms are called unsaturated compounds.
[23] An alloy used in making heating elements for electric heating device is -
A.
Solder
B.
Alloy Steel
C.
Nichrome
D.
German Silver
Ans:
Nichrome
Explanation :
Nichrome is a mixture of chromium and nickel. Nichrome wire is a great conductor of electricity. Nichrome is used to make heating coils and other types of elements in household appliances.
[24] The degree of dissociation of an electrolyte depends on -
A.
dilution
B.
impurities
C.
atmospheric pressure
D.
method of dissolution
Ans:
dilution
Explanation :
The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (5) presence of other ions.
[25] Which of the following is present in Nail polish remover?
A.
Citric acid
B.
Acetone
C.
Ethylene
D.
Benzene
Ans:
Acetone
Explanation :
Acetone can also remove artificial nails made of acrylic or cured gel. An alternative nail polish remover is ethyl acetate, which often also contains isopropyl alcohol.
Explanation :
Liquefied petroleum gas or liquid petroleum gas (LPG) is mostly propane (C3H8), or butane (C4H10). They are most commonly mixtures of these two hydrocarbon gases that are used as fuel in heating appliances, cooking equipment, and vehicles. In the northern hemisphere winter, the mixes contain more propane, while in summer, they contain more butane.
[16] Which have the maximum density?
A.
Water
B.
Benzene
C.
Ice
D.
Chloroform
Ans:
Water
Explanation :
Water has its maximum density of 1g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3.
[17] Which of the following metals is stored in kerosene oil?
A.
Platinum
B.
Copper
C.
Sodium
D.
Gold
Ans:
Sodium
Explanation :
Owing to its extreme reactivity, sodium occurs in nature only combined in compounds never as a pure elemental metal.
[18] Atoms having the same number of protons but different number of neutrons are called :
A.
Isotopes
B.
Cations
C.
Higgs-boson
D.
Anions .
Ans:
Isotopes
Explanation :
Atoms that have the same number of protons but different numbers of neutrons are called isotopes. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively. The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively.
[19] Which one of the following elements is least likely to be found in commercial fertilisers?
A.
Nitrogen
B.
Phosphorus
C.
Potassium
D.
Silicon
Ans:
Silicon
Explanation :
Commercial Fertilizers - a substance containing one or more recognized plant nutrients and that is used for its plant nutrient content or that is designated for use or claimed to have value in promoting plant growth.
[20] Organic compounds are -
A.
Covalent compounds
B.
Ionic compounds
C.
Co-ordination compounds
D.
Interstitial compounds
Ans:
Covalent compounds
Explanation :
Organic compounds are always covalent compounds because it is more energetically favorable for carbon to covalently bond. Organic compounds, such as carbohydrates, lipids, proteins and nucleic acids, are all examples of covalent compounds.
[21] Which of the following is NOT a renewable source of energy?
A.
Wind energy
B.
Geothermal energy
C.
Energy from fossils
D.
Solar energy
Ans:
Energy from fossils
Explanation :
Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight wind, rain, tides, waves, and geothermal heat.
[22] Compounds of carbon having double or triple bonds between their carbon atoms are called -
A.
Saturated compounds
B.
Unsaturated compounds
C.
Reactive compounds
D.
None of the above
Ans:
Unsaturated compounds
Explanation :
Compounds of carbon, which are linked by only single bonds between the carbon atoms are called saturated compounds. Compounds of carbon having double or triple bonds between their carbon atoms are called unsaturated compounds.
[23] An alloy used in making heating elements for electric heating device is -
A.
Solder
B.
Alloy Steel
C.
Nichrome
D.
German Silver
Ans:
Nichrome
Explanation :
Nichrome is a mixture of chromium and nickel. Nichrome wire is a great conductor of electricity. Nichrome is used to make heating coils and other types of elements in household appliances.
[24] The degree of dissociation of an electrolyte depends on -
A.
dilution
B.
impurities
C.
atmospheric pressure
D.
method of dissolution
Ans:
dilution
Explanation :
The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (5) presence of other ions.
[25] Which of the following is present in Nail polish remover?
A.
Citric acid
B.
Acetone
C.
Ethylene
D.
Benzene
Ans:
Acetone
Explanation :
Acetone can also remove artificial nails made of acrylic or cured gel. An alternative nail polish remover is ethyl acetate, which often also contains isopropyl alcohol.
Explanation :
Owing to its extreme reactivity, sodium occurs in nature only combined in compounds never as a pure elemental metal.
[18] Atoms having the same number of protons but different number of neutrons are called :
A.
Isotopes
B.
Cations
C.
Higgs-boson
D.
Anions .
Ans:
Isotopes
Explanation :
Atoms that have the same number of protons but different numbers of neutrons are called isotopes. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively. The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively.
[19] Which one of the following elements is least likely to be found in commercial fertilisers?
A.
Nitrogen
B.
Phosphorus
C.
Potassium
D.
Silicon
Ans:
Silicon
Explanation :
Commercial Fertilizers - a substance containing one or more recognized plant nutrients and that is used for its plant nutrient content or that is designated for use or claimed to have value in promoting plant growth.
[20] Organic compounds are -
A.
Covalent compounds
B.
Ionic compounds
C.
Co-ordination compounds
D.
Interstitial compounds
Ans:
Covalent compounds
Explanation :
Organic compounds are always covalent compounds because it is more energetically favorable for carbon to covalently bond. Organic compounds, such as carbohydrates, lipids, proteins and nucleic acids, are all examples of covalent compounds.
[21] Which of the following is NOT a renewable source of energy?
A.
Wind energy
B.
Geothermal energy
C.
Energy from fossils
D.
Solar energy
Ans:
Energy from fossils
Explanation :
Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight wind, rain, tides, waves, and geothermal heat.
[22] Compounds of carbon having double or triple bonds between their carbon atoms are called -
A.
Saturated compounds
B.
Unsaturated compounds
C.
Reactive compounds
D.
None of the above
Ans:
Unsaturated compounds
Explanation :
Compounds of carbon, which are linked by only single bonds between the carbon atoms are called saturated compounds. Compounds of carbon having double or triple bonds between their carbon atoms are called unsaturated compounds.
[23] An alloy used in making heating elements for electric heating device is -
A.
Solder
B.
Alloy Steel
C.
Nichrome
D.
German Silver
Ans:
Nichrome
Explanation :
Nichrome is a mixture of chromium and nickel. Nichrome wire is a great conductor of electricity. Nichrome is used to make heating coils and other types of elements in household appliances.
[24] The degree of dissociation of an electrolyte depends on -
A.
dilution
B.
impurities
C.
atmospheric pressure
D.
method of dissolution
Ans:
dilution
Explanation :
The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (5) presence of other ions.
[25] Which of the following is present in Nail polish remover?
A.
Citric acid
B.
Acetone
C.
Ethylene
D.
Benzene
Ans:
Acetone
Explanation :
Acetone can also remove artificial nails made of acrylic or cured gel. An alternative nail polish remover is ethyl acetate, which often also contains isopropyl alcohol.
Explanation :
Commercial Fertilizers - a substance containing one or more recognized plant nutrients and that is used for its plant nutrient content or that is designated for use or claimed to have value in promoting plant growth.
[20] Organic compounds are -
A.
Covalent compounds
B.
Ionic compounds
C.
Co-ordination compounds
D.
Interstitial compounds
Ans:
Covalent compounds
Explanation :
Organic compounds are always covalent compounds because it is more energetically favorable for carbon to covalently bond. Organic compounds, such as carbohydrates, lipids, proteins and nucleic acids, are all examples of covalent compounds.
[21] Which of the following is NOT a renewable source of energy?
A.
Wind energy
B.
Geothermal energy
C.
Energy from fossils
D.
Solar energy
Ans:
Energy from fossils
Explanation :
Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight wind, rain, tides, waves, and geothermal heat.
[22] Compounds of carbon having double or triple bonds between their carbon atoms are called -
A.
Saturated compounds
B.
Unsaturated compounds
C.
Reactive compounds
D.
None of the above
Ans:
Unsaturated compounds
Explanation :
Compounds of carbon, which are linked by only single bonds between the carbon atoms are called saturated compounds. Compounds of carbon having double or triple bonds between their carbon atoms are called unsaturated compounds.
[23] An alloy used in making heating elements for electric heating device is -
A.
Solder
B.
Alloy Steel
C.
Nichrome
D.
German Silver
Ans:
Nichrome
Explanation :
Nichrome is a mixture of chromium and nickel. Nichrome wire is a great conductor of electricity. Nichrome is used to make heating coils and other types of elements in household appliances.
[24] The degree of dissociation of an electrolyte depends on -
A.
dilution
B.
impurities
C.
atmospheric pressure
D.
method of dissolution
Ans:
dilution
Explanation :
The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (5) presence of other ions.
[25] Which of the following is present in Nail polish remover?
A.
Citric acid
B.
Acetone
C.
Ethylene
D.
Benzene
Ans:
Acetone
Explanation :
Acetone can also remove artificial nails made of acrylic or cured gel. An alternative nail polish remover is ethyl acetate, which often also contains isopropyl alcohol.
Explanation :
Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight wind, rain, tides, waves, and geothermal heat.
[22] Compounds of carbon having double or triple bonds between their carbon atoms are called -
A.
Saturated compounds
B.
Unsaturated compounds
C.
Reactive compounds
D.
None of the above
Ans:
Unsaturated compounds
Explanation :
Compounds of carbon, which are linked by only single bonds between the carbon atoms are called saturated compounds. Compounds of carbon having double or triple bonds between their carbon atoms are called unsaturated compounds.
[23] An alloy used in making heating elements for electric heating device is -
A.
Solder
B.
Alloy Steel
C.
Nichrome
D.
German Silver
Ans:
Nichrome
Explanation :
Nichrome is a mixture of chromium and nickel. Nichrome wire is a great conductor of electricity. Nichrome is used to make heating coils and other types of elements in household appliances.
[24] The degree of dissociation of an electrolyte depends on -
A.
dilution
B.
impurities
C.
atmospheric pressure
D.
method of dissolution
Ans:
dilution
Explanation :
The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (5) presence of other ions.
[25] Which of the following is present in Nail polish remover?
A.
Citric acid
B.
Acetone
C.
Ethylene
D.
Benzene
Ans:
Acetone
Explanation :
Acetone can also remove artificial nails made of acrylic or cured gel. An alternative nail polish remover is ethyl acetate, which often also contains isopropyl alcohol.
Explanation :
Nichrome is a mixture of chromium and nickel. Nichrome wire is a great conductor of electricity. Nichrome is used to make heating coils and other types of elements in household appliances.
[24] The degree of dissociation of an electrolyte depends on -
A.
dilution
B.
impurities
C.
atmospheric pressure
D.
method of dissolution
Ans:
dilution
Explanation :
The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (5) presence of other ions.
[25] Which of the following is present in Nail polish remover?
A.
Citric acid
B.
Acetone
C.
Ethylene
D.
Benzene
Ans:
Acetone
Explanation :
Acetone can also remove artificial nails made of acrylic or cured gel. An alternative nail polish remover is ethyl acetate, which often also contains isopropyl alcohol.
Explanation :
Acetone can also remove artificial nails made of acrylic or cured gel. An alternative nail polish remover is ethyl acetate, which often also contains isopropyl alcohol.