[1] Of the following which one pollutes the air of a big city?
A.
Copper
B.
Chromium
C.
Lead
D.
Calcium
Ans:
Lead
Explanation :
Lead pollution primarily came from cars in the past. Today, lead pollution primarily comes from lead smelters, metal processing plants and incinerators. Deposits of lead in soil can harm both humans and animals by absorbing it into a body.
[2] "Fire-fighting clothes" are made from –
A.
Mica
B.
Asbestos
C.
Talc
D.
Steatite
Ans:
Asbestos
Explanation :
Bunker Gear or "Turnout Gear" are terms used by many firefighters to refer to their system of outer protective clothing. Fire fighter used to be made of asbestos in the past. Because of its carcinogenic properties and other harmful effects, it has slowly been replaced by other substitutes. Fire-fighting and working clothes and accessories for firemen, rescuers and industrials made of materials FR cotton, Nomex, Modacryl, FR viscose and others.
[3] Hydrofluoric acid is not kept in glass bottles because it reacts with -
A.
visible light
B.
silicon dioxide of glass
C.
aluminium oxide of glass
D.
sodium oxide of glass
Ans:
silicon dioxide of glass
Explanation :
0
[4] ‘Freon' used as refrigerants is chemically known as -
A.
chlorinated hydrocarbon
B.
fluorinated hydrocarbon
C.
chlorofluoro hydrocarbon
D.
fluorinated aromatic compound
Ans:
chlorofluoro hydrocarbon
Explanation :
In addition to fluorine and carbon, Freons often contain hydrogen, chlorine, or bromine. Thus, Freons are types of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and related compounds.
[5] One light year is equal to -
A.
9.46x 10⁻¹⁵m
B.
9.46x 10¹⁵m
C.
9.46x 10⁻¹³m
D.
9.46x 10¹³m
Ans:
9.46x 10¹⁵m
Explanation :
A light-year is the distance light travels in one year. How far is that? Multiply the number of seconds in one year by the number of miles or kilometers that light travels in one second, and there you have it: one light-year.
[6] Which gas is used in fire extinguishers?
A.
Carbon dioxide
B.
Nitrogen oxide
C.
Carbon monoxide
D.
Sulpher dioxide
Ans:
Carbon dioxide
Explanation :
Sodium bicarbonate, regular or ordinary used on class B and C fires, was the first of the dry chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire.
[7] Combustion of a candle is a/an -
A.
photochemical reaction
B.
physical change
C.
endothermic reaction
D.
exothermic reaction
Ans:
exothermic reaction
Explanation :
In theory, a candle is made of a solid hydrocarbon called paraffin. When the solid burns, the hydrocarbon reacts with oxygen to form carbon dioxide and water. The reaction is exothermic, meaning it releases heat to the atmosphere along with the other products.
[8] Another name for baking soda is :
A.
Sodium bicarbonate
B.
Sodium carbonate
C.
Sodium sulphate
D.
Sodium hydroxide
Ans:
Sodium bicarbonate
Explanation :
Sodium bicarbonate (NaHCO3) is also known as baking soda. It is a chemical leavening agent which is added to baked goods before cooking to produce carbon dioxide and cause them to ‘rise’.
[9] Which of the following substances undergoes chemical change on heating?
A.
Sodium chloride
B.
Silica
C.
Lead nitrate
D.
Platinum wire
Ans:
Lead nitrate
Explanation :
Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.
[10] Who invented the modern Periodic table?
A.
Faraday
B.
Mendeleev
C.
Newton
D.
Bohr
Ans:
Mendeleev
Explanation :
Dmitri Mendeleev was a Russian chemist who developed the periodic classification of the elements in 1869 A.D.
[11] Brass is an alloy of -
A.
Nickel and Copper
B.
Copper and Silver
C.
Nickel and Zinc
D.
Zinc and Copper
Ans:
Zinc and Copper
Explanation :
Brass is an alloy of copper and zinc, in proportions which can be varied to achieve varying mechanical and electrical properties.
[12] "Bhopal gas tragedy" 1984 is related to –
A.
Aluminium Phosphide
B.
Methyl bromide
C.
Methyl isocyanate
D.
Carbon dioxide
Ans:
Methyl isocyanate
Explanation :
In the Bhopal disaster which took place on 2-3 December, 1984 over 500,000 people were exposed to methyl isocyanate gas and other chemicals. The toxic substance made its way in and around the shantytowns located near the plant.
[13] The percentage of nitrogen present in ammonium sulphate is –
A.
0.27
B.
0.25
C.
0.305
D.
0.18
Ans:
0.27
Explanation :
Ammonium sulfate, (NH4)4SO4 contains 21% nitrogen as ammonium cations, and 24% sulfur as sulfate anions. It is an inorganic salt which is most commonly used as a soil fertilizer.
[14] Surface water is a better source of drinking water because it is poor in -
A.
Dust
B.
Bacteria
C.
Arsenic
D.
Algae
Ans:
Arsenic
Explanation :
Surface water is a better source of drinking water because it is poor in arsenic.
[15] Saturated hydrocarbons are called -
A.
Alkynes
B.
Alkenes
C.
Alkanes
D.
All of the above
Ans:
Alkanes
Explanation :
Carbon compounds which contain just carbon and hydrogen are called hydrocarbons. Among these, the saturated hydrocarbons are called alkanes. The unsaturated hydrocarbons which contain one or more double bonds are called alkenes.
[16] Which one of the following elements is polyatomic?
A.
Argon
B.
Sodium
C.
Sulphur
D.
Oxygen
Ans:
Sulphur
Explanation :
The term polyatomic is used for a molecule or an ion which contains either two or more than two atoms.
[17] Which of the following is not a chemical reaction?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
Water boiling is a physical reaction only because during physical reaction there is a change of state but during chemical reaction there is breaking or making of bonds.
[18] Which type of fire extinguisher is used for petroleum fire?
A.
Foam type
B.
Soda acid type
C.
Powder type
D.
None of these
Ans:
Foam type
Explanation :
Foam type fire extinguishers are suitable for fires that involve flammable or combustible liquids, including petrol, grease, and oil. They are applied to fuel fires as either an aspirated (mixed & expanded with air in a branch pipe) or nonaspirated form to form a frothy blanket or seal over the fuel, preventing oxygen reaching it. Powder types are useful for combustible metals.
[19] The function of skimming tank in sewage treatment is to remove –
A.
oil and fatty substances
B.
suspended solids
C.
gritty substances
D.
inorganic substances
Ans:
oil and fatty substances
Explanation :
Oil and grease traps are small size skimming basins provided to remove oil and grease and other small floating materials such as fats, vegetable debris, fruit skins, etc. It is so designed that lighter materials like grease and oil content of wastewater rise to the surface of wastewater and remains on top of liquid until removed.
[20] Who discovered Oxygen?
A.
Carl Scheele
B.
Hooke
C.
Heisenberg
D.
Williams
Ans:
Carl Scheele
Explanation :
Oxygen was discovered for the first time by a Swedish Chemist, Carl Wilhelm Scheele in 1772.He called the gas "fire air".
[21] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Hydrogen peroxide
D.
Heavy water
Ans:
Heavy water
Explanation :
A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator.
[22] Which one of the following is used as preservative for foodstuff?
A.
Sodium Benzoate
B.
Picric acid
C.
Glycerine
D.
Sodium Chloride
Ans:
Sodium Benzoate
Explanation :
Sodium benzoate is a preservative. It is bacteriostatic and fungistatic under acidic conditions. It is most widely used in acidic foods such as salad dressings (vinegar), carbonated drinks (carbonic acid), jams and fruit juices (citric acid), pickles (vinegar), and condiments. It is also used as a preservative in medicines and cosmetics.
[23] The element with highest first ionization energy is -
A.
hydrogen
B.
helium
C.
lithium
D.
sodium
Ans:
helium
Explanation :
The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
[24] The chief source of naphthalene is –
A.
Coal-tear
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tear
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[25] KMnO4 can be used as a/an -
A.
insecticide
B.
fertiliser
C.
pesticide
D.
disinfectant
Ans:
disinfectant
Explanation :
Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry.
Explanation :
Lead pollution primarily came from cars in the past. Today, lead pollution primarily comes from lead smelters, metal processing plants and incinerators. Deposits of lead in soil can harm both humans and animals by absorbing it into a body.
[2] "Fire-fighting clothes" are made from –
A.
Mica
B.
Asbestos
C.
Talc
D.
Steatite
Ans:
Asbestos
Explanation :
Bunker Gear or "Turnout Gear" are terms used by many firefighters to refer to their system of outer protective clothing. Fire fighter used to be made of asbestos in the past. Because of its carcinogenic properties and other harmful effects, it has slowly been replaced by other substitutes. Fire-fighting and working clothes and accessories for firemen, rescuers and industrials made of materials FR cotton, Nomex, Modacryl, FR viscose and others.
[3] Hydrofluoric acid is not kept in glass bottles because it reacts with -
A.
visible light
B.
silicon dioxide of glass
C.
aluminium oxide of glass
D.
sodium oxide of glass
Ans:
silicon dioxide of glass
Explanation :
0
[4] ‘Freon' used as refrigerants is chemically known as -
A.
chlorinated hydrocarbon
B.
fluorinated hydrocarbon
C.
chlorofluoro hydrocarbon
D.
fluorinated aromatic compound
Ans:
chlorofluoro hydrocarbon
Explanation :
In addition to fluorine and carbon, Freons often contain hydrogen, chlorine, or bromine. Thus, Freons are types of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and related compounds.
[5] One light year is equal to -
A.
9.46x 10⁻¹⁵m
B.
9.46x 10¹⁵m
C.
9.46x 10⁻¹³m
D.
9.46x 10¹³m
Ans:
9.46x 10¹⁵m
Explanation :
A light-year is the distance light travels in one year. How far is that? Multiply the number of seconds in one year by the number of miles or kilometers that light travels in one second, and there you have it: one light-year.
[6] Which gas is used in fire extinguishers?
A.
Carbon dioxide
B.
Nitrogen oxide
C.
Carbon monoxide
D.
Sulpher dioxide
Ans:
Carbon dioxide
Explanation :
Sodium bicarbonate, regular or ordinary used on class B and C fires, was the first of the dry chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire.
[7] Combustion of a candle is a/an -
A.
photochemical reaction
B.
physical change
C.
endothermic reaction
D.
exothermic reaction
Ans:
exothermic reaction
Explanation :
In theory, a candle is made of a solid hydrocarbon called paraffin. When the solid burns, the hydrocarbon reacts with oxygen to form carbon dioxide and water. The reaction is exothermic, meaning it releases heat to the atmosphere along with the other products.
[8] Another name for baking soda is :
A.
Sodium bicarbonate
B.
Sodium carbonate
C.
Sodium sulphate
D.
Sodium hydroxide
Ans:
Sodium bicarbonate
Explanation :
Sodium bicarbonate (NaHCO3) is also known as baking soda. It is a chemical leavening agent which is added to baked goods before cooking to produce carbon dioxide and cause them to ‘rise’.
[9] Which of the following substances undergoes chemical change on heating?
A.
Sodium chloride
B.
Silica
C.
Lead nitrate
D.
Platinum wire
Ans:
Lead nitrate
Explanation :
Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.
[10] Who invented the modern Periodic table?
A.
Faraday
B.
Mendeleev
C.
Newton
D.
Bohr
Ans:
Mendeleev
Explanation :
Dmitri Mendeleev was a Russian chemist who developed the periodic classification of the elements in 1869 A.D.
[11] Brass is an alloy of -
A.
Nickel and Copper
B.
Copper and Silver
C.
Nickel and Zinc
D.
Zinc and Copper
Ans:
Zinc and Copper
Explanation :
Brass is an alloy of copper and zinc, in proportions which can be varied to achieve varying mechanical and electrical properties.
[12] "Bhopal gas tragedy" 1984 is related to –
A.
Aluminium Phosphide
B.
Methyl bromide
C.
Methyl isocyanate
D.
Carbon dioxide
Ans:
Methyl isocyanate
Explanation :
In the Bhopal disaster which took place on 2-3 December, 1984 over 500,000 people were exposed to methyl isocyanate gas and other chemicals. The toxic substance made its way in and around the shantytowns located near the plant.
[13] The percentage of nitrogen present in ammonium sulphate is –
A.
0.27
B.
0.25
C.
0.305
D.
0.18
Ans:
0.27
Explanation :
Ammonium sulfate, (NH4)4SO4 contains 21% nitrogen as ammonium cations, and 24% sulfur as sulfate anions. It is an inorganic salt which is most commonly used as a soil fertilizer.
[14] Surface water is a better source of drinking water because it is poor in -
A.
Dust
B.
Bacteria
C.
Arsenic
D.
Algae
Ans:
Arsenic
Explanation :
Surface water is a better source of drinking water because it is poor in arsenic.
[15] Saturated hydrocarbons are called -
A.
Alkynes
B.
Alkenes
C.
Alkanes
D.
All of the above
Ans:
Alkanes
Explanation :
Carbon compounds which contain just carbon and hydrogen are called hydrocarbons. Among these, the saturated hydrocarbons are called alkanes. The unsaturated hydrocarbons which contain one or more double bonds are called alkenes.
[16] Which one of the following elements is polyatomic?
A.
Argon
B.
Sodium
C.
Sulphur
D.
Oxygen
Ans:
Sulphur
Explanation :
The term polyatomic is used for a molecule or an ion which contains either two or more than two atoms.
[17] Which of the following is not a chemical reaction?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
Water boiling is a physical reaction only because during physical reaction there is a change of state but during chemical reaction there is breaking or making of bonds.
[18] Which type of fire extinguisher is used for petroleum fire?
A.
Foam type
B.
Soda acid type
C.
Powder type
D.
None of these
Ans:
Foam type
Explanation :
Foam type fire extinguishers are suitable for fires that involve flammable or combustible liquids, including petrol, grease, and oil. They are applied to fuel fires as either an aspirated (mixed & expanded with air in a branch pipe) or nonaspirated form to form a frothy blanket or seal over the fuel, preventing oxygen reaching it. Powder types are useful for combustible metals.
[19] The function of skimming tank in sewage treatment is to remove –
A.
oil and fatty substances
B.
suspended solids
C.
gritty substances
D.
inorganic substances
Ans:
oil and fatty substances
Explanation :
Oil and grease traps are small size skimming basins provided to remove oil and grease and other small floating materials such as fats, vegetable debris, fruit skins, etc. It is so designed that lighter materials like grease and oil content of wastewater rise to the surface of wastewater and remains on top of liquid until removed.
[20] Who discovered Oxygen?
A.
Carl Scheele
B.
Hooke
C.
Heisenberg
D.
Williams
Ans:
Carl Scheele
Explanation :
Oxygen was discovered for the first time by a Swedish Chemist, Carl Wilhelm Scheele in 1772.He called the gas "fire air".
[21] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Hydrogen peroxide
D.
Heavy water
Ans:
Heavy water
Explanation :
A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator.
[22] Which one of the following is used as preservative for foodstuff?
A.
Sodium Benzoate
B.
Picric acid
C.
Glycerine
D.
Sodium Chloride
Ans:
Sodium Benzoate
Explanation :
Sodium benzoate is a preservative. It is bacteriostatic and fungistatic under acidic conditions. It is most widely used in acidic foods such as salad dressings (vinegar), carbonated drinks (carbonic acid), jams and fruit juices (citric acid), pickles (vinegar), and condiments. It is also used as a preservative in medicines and cosmetics.
[23] The element with highest first ionization energy is -
A.
hydrogen
B.
helium
C.
lithium
D.
sodium
Ans:
helium
Explanation :
The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
[24] The chief source of naphthalene is –
A.
Coal-tear
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tear
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[25] KMnO4 can be used as a/an -
A.
insecticide
B.
fertiliser
C.
pesticide
D.
disinfectant
Ans:
disinfectant
Explanation :
Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry.
Explanation :
0
[4] ‘Freon' used as refrigerants is chemically known as -
A.
chlorinated hydrocarbon
B.
fluorinated hydrocarbon
C.
chlorofluoro hydrocarbon
D.
fluorinated aromatic compound
Ans:
chlorofluoro hydrocarbon
Explanation :
In addition to fluorine and carbon, Freons often contain hydrogen, chlorine, or bromine. Thus, Freons are types of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and related compounds.
[5] One light year is equal to -
A.
9.46x 10⁻¹⁵m
B.
9.46x 10¹⁵m
C.
9.46x 10⁻¹³m
D.
9.46x 10¹³m
Ans:
9.46x 10¹⁵m
Explanation :
A light-year is the distance light travels in one year. How far is that? Multiply the number of seconds in one year by the number of miles or kilometers that light travels in one second, and there you have it: one light-year.
[6] Which gas is used in fire extinguishers?
A.
Carbon dioxide
B.
Nitrogen oxide
C.
Carbon monoxide
D.
Sulpher dioxide
Ans:
Carbon dioxide
Explanation :
Sodium bicarbonate, regular or ordinary used on class B and C fires, was the first of the dry chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire.
[7] Combustion of a candle is a/an -
A.
photochemical reaction
B.
physical change
C.
endothermic reaction
D.
exothermic reaction
Ans:
exothermic reaction
Explanation :
In theory, a candle is made of a solid hydrocarbon called paraffin. When the solid burns, the hydrocarbon reacts with oxygen to form carbon dioxide and water. The reaction is exothermic, meaning it releases heat to the atmosphere along with the other products.
[8] Another name for baking soda is :
A.
Sodium bicarbonate
B.
Sodium carbonate
C.
Sodium sulphate
D.
Sodium hydroxide
Ans:
Sodium bicarbonate
Explanation :
Sodium bicarbonate (NaHCO3) is also known as baking soda. It is a chemical leavening agent which is added to baked goods before cooking to produce carbon dioxide and cause them to ‘rise’.
[9] Which of the following substances undergoes chemical change on heating?
A.
Sodium chloride
B.
Silica
C.
Lead nitrate
D.
Platinum wire
Ans:
Lead nitrate
Explanation :
Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.
[10] Who invented the modern Periodic table?
A.
Faraday
B.
Mendeleev
C.
Newton
D.
Bohr
Ans:
Mendeleev
Explanation :
Dmitri Mendeleev was a Russian chemist who developed the periodic classification of the elements in 1869 A.D.
[11] Brass is an alloy of -
A.
Nickel and Copper
B.
Copper and Silver
C.
Nickel and Zinc
D.
Zinc and Copper
Ans:
Zinc and Copper
Explanation :
Brass is an alloy of copper and zinc, in proportions which can be varied to achieve varying mechanical and electrical properties.
[12] "Bhopal gas tragedy" 1984 is related to –
A.
Aluminium Phosphide
B.
Methyl bromide
C.
Methyl isocyanate
D.
Carbon dioxide
Ans:
Methyl isocyanate
Explanation :
In the Bhopal disaster which took place on 2-3 December, 1984 over 500,000 people were exposed to methyl isocyanate gas and other chemicals. The toxic substance made its way in and around the shantytowns located near the plant.
[13] The percentage of nitrogen present in ammonium sulphate is –
A.
0.27
B.
0.25
C.
0.305
D.
0.18
Ans:
0.27
Explanation :
Ammonium sulfate, (NH4)4SO4 contains 21% nitrogen as ammonium cations, and 24% sulfur as sulfate anions. It is an inorganic salt which is most commonly used as a soil fertilizer.
[14] Surface water is a better source of drinking water because it is poor in -
A.
Dust
B.
Bacteria
C.
Arsenic
D.
Algae
Ans:
Arsenic
Explanation :
Surface water is a better source of drinking water because it is poor in arsenic.
[15] Saturated hydrocarbons are called -
A.
Alkynes
B.
Alkenes
C.
Alkanes
D.
All of the above
Ans:
Alkanes
Explanation :
Carbon compounds which contain just carbon and hydrogen are called hydrocarbons. Among these, the saturated hydrocarbons are called alkanes. The unsaturated hydrocarbons which contain one or more double bonds are called alkenes.
[16] Which one of the following elements is polyatomic?
A.
Argon
B.
Sodium
C.
Sulphur
D.
Oxygen
Ans:
Sulphur
Explanation :
The term polyatomic is used for a molecule or an ion which contains either two or more than two atoms.
[17] Which of the following is not a chemical reaction?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
Water boiling is a physical reaction only because during physical reaction there is a change of state but during chemical reaction there is breaking or making of bonds.
[18] Which type of fire extinguisher is used for petroleum fire?
A.
Foam type
B.
Soda acid type
C.
Powder type
D.
None of these
Ans:
Foam type
Explanation :
Foam type fire extinguishers are suitable for fires that involve flammable or combustible liquids, including petrol, grease, and oil. They are applied to fuel fires as either an aspirated (mixed & expanded with air in a branch pipe) or nonaspirated form to form a frothy blanket or seal over the fuel, preventing oxygen reaching it. Powder types are useful for combustible metals.
[19] The function of skimming tank in sewage treatment is to remove –
A.
oil and fatty substances
B.
suspended solids
C.
gritty substances
D.
inorganic substances
Ans:
oil and fatty substances
Explanation :
Oil and grease traps are small size skimming basins provided to remove oil and grease and other small floating materials such as fats, vegetable debris, fruit skins, etc. It is so designed that lighter materials like grease and oil content of wastewater rise to the surface of wastewater and remains on top of liquid until removed.
[20] Who discovered Oxygen?
A.
Carl Scheele
B.
Hooke
C.
Heisenberg
D.
Williams
Ans:
Carl Scheele
Explanation :
Oxygen was discovered for the first time by a Swedish Chemist, Carl Wilhelm Scheele in 1772.He called the gas "fire air".
[21] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Hydrogen peroxide
D.
Heavy water
Ans:
Heavy water
Explanation :
A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator.
[22] Which one of the following is used as preservative for foodstuff?
A.
Sodium Benzoate
B.
Picric acid
C.
Glycerine
D.
Sodium Chloride
Ans:
Sodium Benzoate
Explanation :
Sodium benzoate is a preservative. It is bacteriostatic and fungistatic under acidic conditions. It is most widely used in acidic foods such as salad dressings (vinegar), carbonated drinks (carbonic acid), jams and fruit juices (citric acid), pickles (vinegar), and condiments. It is also used as a preservative in medicines and cosmetics.
[23] The element with highest first ionization energy is -
A.
hydrogen
B.
helium
C.
lithium
D.
sodium
Ans:
helium
Explanation :
The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
[24] The chief source of naphthalene is –
A.
Coal-tear
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tear
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[25] KMnO4 can be used as a/an -
A.
insecticide
B.
fertiliser
C.
pesticide
D.
disinfectant
Ans:
disinfectant
Explanation :
Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry.
Explanation :
A light-year is the distance light travels in one year. How far is that? Multiply the number of seconds in one year by the number of miles or kilometers that light travels in one second, and there you have it: one light-year.
[6] Which gas is used in fire extinguishers?
A.
Carbon dioxide
B.
Nitrogen oxide
C.
Carbon monoxide
D.
Sulpher dioxide
Ans:
Carbon dioxide
Explanation :
Sodium bicarbonate, regular or ordinary used on class B and C fires, was the first of the dry chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire.
[7] Combustion of a candle is a/an -
A.
photochemical reaction
B.
physical change
C.
endothermic reaction
D.
exothermic reaction
Ans:
exothermic reaction
Explanation :
In theory, a candle is made of a solid hydrocarbon called paraffin. When the solid burns, the hydrocarbon reacts with oxygen to form carbon dioxide and water. The reaction is exothermic, meaning it releases heat to the atmosphere along with the other products.
[8] Another name for baking soda is :
A.
Sodium bicarbonate
B.
Sodium carbonate
C.
Sodium sulphate
D.
Sodium hydroxide
Ans:
Sodium bicarbonate
Explanation :
Sodium bicarbonate (NaHCO3) is also known as baking soda. It is a chemical leavening agent which is added to baked goods before cooking to produce carbon dioxide and cause them to ‘rise’.
[9] Which of the following substances undergoes chemical change on heating?
A.
Sodium chloride
B.
Silica
C.
Lead nitrate
D.
Platinum wire
Ans:
Lead nitrate
Explanation :
Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.
[10] Who invented the modern Periodic table?
A.
Faraday
B.
Mendeleev
C.
Newton
D.
Bohr
Ans:
Mendeleev
Explanation :
Dmitri Mendeleev was a Russian chemist who developed the periodic classification of the elements in 1869 A.D.
[11] Brass is an alloy of -
A.
Nickel and Copper
B.
Copper and Silver
C.
Nickel and Zinc
D.
Zinc and Copper
Ans:
Zinc and Copper
Explanation :
Brass is an alloy of copper and zinc, in proportions which can be varied to achieve varying mechanical and electrical properties.
[12] "Bhopal gas tragedy" 1984 is related to –
A.
Aluminium Phosphide
B.
Methyl bromide
C.
Methyl isocyanate
D.
Carbon dioxide
Ans:
Methyl isocyanate
Explanation :
In the Bhopal disaster which took place on 2-3 December, 1984 over 500,000 people were exposed to methyl isocyanate gas and other chemicals. The toxic substance made its way in and around the shantytowns located near the plant.
[13] The percentage of nitrogen present in ammonium sulphate is –
A.
0.27
B.
0.25
C.
0.305
D.
0.18
Ans:
0.27
Explanation :
Ammonium sulfate, (NH4)4SO4 contains 21% nitrogen as ammonium cations, and 24% sulfur as sulfate anions. It is an inorganic salt which is most commonly used as a soil fertilizer.
[14] Surface water is a better source of drinking water because it is poor in -
A.
Dust
B.
Bacteria
C.
Arsenic
D.
Algae
Ans:
Arsenic
Explanation :
Surface water is a better source of drinking water because it is poor in arsenic.
[15] Saturated hydrocarbons are called -
A.
Alkynes
B.
Alkenes
C.
Alkanes
D.
All of the above
Ans:
Alkanes
Explanation :
Carbon compounds which contain just carbon and hydrogen are called hydrocarbons. Among these, the saturated hydrocarbons are called alkanes. The unsaturated hydrocarbons which contain one or more double bonds are called alkenes.
[16] Which one of the following elements is polyatomic?
A.
Argon
B.
Sodium
C.
Sulphur
D.
Oxygen
Ans:
Sulphur
Explanation :
The term polyatomic is used for a molecule or an ion which contains either two or more than two atoms.
[17] Which of the following is not a chemical reaction?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
Water boiling is a physical reaction only because during physical reaction there is a change of state but during chemical reaction there is breaking or making of bonds.
[18] Which type of fire extinguisher is used for petroleum fire?
A.
Foam type
B.
Soda acid type
C.
Powder type
D.
None of these
Ans:
Foam type
Explanation :
Foam type fire extinguishers are suitable for fires that involve flammable or combustible liquids, including petrol, grease, and oil. They are applied to fuel fires as either an aspirated (mixed & expanded with air in a branch pipe) or nonaspirated form to form a frothy blanket or seal over the fuel, preventing oxygen reaching it. Powder types are useful for combustible metals.
[19] The function of skimming tank in sewage treatment is to remove –
A.
oil and fatty substances
B.
suspended solids
C.
gritty substances
D.
inorganic substances
Ans:
oil and fatty substances
Explanation :
Oil and grease traps are small size skimming basins provided to remove oil and grease and other small floating materials such as fats, vegetable debris, fruit skins, etc. It is so designed that lighter materials like grease and oil content of wastewater rise to the surface of wastewater and remains on top of liquid until removed.
[20] Who discovered Oxygen?
A.
Carl Scheele
B.
Hooke
C.
Heisenberg
D.
Williams
Ans:
Carl Scheele
Explanation :
Oxygen was discovered for the first time by a Swedish Chemist, Carl Wilhelm Scheele in 1772.He called the gas "fire air".
[21] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Hydrogen peroxide
D.
Heavy water
Ans:
Heavy water
Explanation :
A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator.
[22] Which one of the following is used as preservative for foodstuff?
A.
Sodium Benzoate
B.
Picric acid
C.
Glycerine
D.
Sodium Chloride
Ans:
Sodium Benzoate
Explanation :
Sodium benzoate is a preservative. It is bacteriostatic and fungistatic under acidic conditions. It is most widely used in acidic foods such as salad dressings (vinegar), carbonated drinks (carbonic acid), jams and fruit juices (citric acid), pickles (vinegar), and condiments. It is also used as a preservative in medicines and cosmetics.
[23] The element with highest first ionization energy is -
A.
hydrogen
B.
helium
C.
lithium
D.
sodium
Ans:
helium
Explanation :
The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
[24] The chief source of naphthalene is –
A.
Coal-tear
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tear
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[25] KMnO4 can be used as a/an -
A.
insecticide
B.
fertiliser
C.
pesticide
D.
disinfectant
Ans:
disinfectant
Explanation :
Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry.
Explanation :
In theory, a candle is made of a solid hydrocarbon called paraffin. When the solid burns, the hydrocarbon reacts with oxygen to form carbon dioxide and water. The reaction is exothermic, meaning it releases heat to the atmosphere along with the other products.
[8] Another name for baking soda is :
A.
Sodium bicarbonate
B.
Sodium carbonate
C.
Sodium sulphate
D.
Sodium hydroxide
Ans:
Sodium bicarbonate
Explanation :
Sodium bicarbonate (NaHCO3) is also known as baking soda. It is a chemical leavening agent which is added to baked goods before cooking to produce carbon dioxide and cause them to ‘rise’.
[9] Which of the following substances undergoes chemical change on heating?
A.
Sodium chloride
B.
Silica
C.
Lead nitrate
D.
Platinum wire
Ans:
Lead nitrate
Explanation :
Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.
[10] Who invented the modern Periodic table?
A.
Faraday
B.
Mendeleev
C.
Newton
D.
Bohr
Ans:
Mendeleev
Explanation :
Dmitri Mendeleev was a Russian chemist who developed the periodic classification of the elements in 1869 A.D.
[11] Brass is an alloy of -
A.
Nickel and Copper
B.
Copper and Silver
C.
Nickel and Zinc
D.
Zinc and Copper
Ans:
Zinc and Copper
Explanation :
Brass is an alloy of copper and zinc, in proportions which can be varied to achieve varying mechanical and electrical properties.
[12] "Bhopal gas tragedy" 1984 is related to –
A.
Aluminium Phosphide
B.
Methyl bromide
C.
Methyl isocyanate
D.
Carbon dioxide
Ans:
Methyl isocyanate
Explanation :
In the Bhopal disaster which took place on 2-3 December, 1984 over 500,000 people were exposed to methyl isocyanate gas and other chemicals. The toxic substance made its way in and around the shantytowns located near the plant.
[13] The percentage of nitrogen present in ammonium sulphate is –
A.
0.27
B.
0.25
C.
0.305
D.
0.18
Ans:
0.27
Explanation :
Ammonium sulfate, (NH4)4SO4 contains 21% nitrogen as ammonium cations, and 24% sulfur as sulfate anions. It is an inorganic salt which is most commonly used as a soil fertilizer.
[14] Surface water is a better source of drinking water because it is poor in -
A.
Dust
B.
Bacteria
C.
Arsenic
D.
Algae
Ans:
Arsenic
Explanation :
Surface water is a better source of drinking water because it is poor in arsenic.
[15] Saturated hydrocarbons are called -
A.
Alkynes
B.
Alkenes
C.
Alkanes
D.
All of the above
Ans:
Alkanes
Explanation :
Carbon compounds which contain just carbon and hydrogen are called hydrocarbons. Among these, the saturated hydrocarbons are called alkanes. The unsaturated hydrocarbons which contain one or more double bonds are called alkenes.
[16] Which one of the following elements is polyatomic?
A.
Argon
B.
Sodium
C.
Sulphur
D.
Oxygen
Ans:
Sulphur
Explanation :
The term polyatomic is used for a molecule or an ion which contains either two or more than two atoms.
[17] Which of the following is not a chemical reaction?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
Water boiling is a physical reaction only because during physical reaction there is a change of state but during chemical reaction there is breaking or making of bonds.
[18] Which type of fire extinguisher is used for petroleum fire?
A.
Foam type
B.
Soda acid type
C.
Powder type
D.
None of these
Ans:
Foam type
Explanation :
Foam type fire extinguishers are suitable for fires that involve flammable or combustible liquids, including petrol, grease, and oil. They are applied to fuel fires as either an aspirated (mixed & expanded with air in a branch pipe) or nonaspirated form to form a frothy blanket or seal over the fuel, preventing oxygen reaching it. Powder types are useful for combustible metals.
[19] The function of skimming tank in sewage treatment is to remove –
A.
oil and fatty substances
B.
suspended solids
C.
gritty substances
D.
inorganic substances
Ans:
oil and fatty substances
Explanation :
Oil and grease traps are small size skimming basins provided to remove oil and grease and other small floating materials such as fats, vegetable debris, fruit skins, etc. It is so designed that lighter materials like grease and oil content of wastewater rise to the surface of wastewater and remains on top of liquid until removed.
[20] Who discovered Oxygen?
A.
Carl Scheele
B.
Hooke
C.
Heisenberg
D.
Williams
Ans:
Carl Scheele
Explanation :
Oxygen was discovered for the first time by a Swedish Chemist, Carl Wilhelm Scheele in 1772.He called the gas "fire air".
[21] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Hydrogen peroxide
D.
Heavy water
Ans:
Heavy water
Explanation :
A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator.
[22] Which one of the following is used as preservative for foodstuff?
A.
Sodium Benzoate
B.
Picric acid
C.
Glycerine
D.
Sodium Chloride
Ans:
Sodium Benzoate
Explanation :
Sodium benzoate is a preservative. It is bacteriostatic and fungistatic under acidic conditions. It is most widely used in acidic foods such as salad dressings (vinegar), carbonated drinks (carbonic acid), jams and fruit juices (citric acid), pickles (vinegar), and condiments. It is also used as a preservative in medicines and cosmetics.
[23] The element with highest first ionization energy is -
A.
hydrogen
B.
helium
C.
lithium
D.
sodium
Ans:
helium
Explanation :
The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
[24] The chief source of naphthalene is –
A.
Coal-tear
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tear
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[25] KMnO4 can be used as a/an -
A.
insecticide
B.
fertiliser
C.
pesticide
D.
disinfectant
Ans:
disinfectant
Explanation :
Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry.
Explanation :
Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.
[10] Who invented the modern Periodic table?
A.
Faraday
B.
Mendeleev
C.
Newton
D.
Bohr
Ans:
Mendeleev
Explanation :
Dmitri Mendeleev was a Russian chemist who developed the periodic classification of the elements in 1869 A.D.
[11] Brass is an alloy of -
A.
Nickel and Copper
B.
Copper and Silver
C.
Nickel and Zinc
D.
Zinc and Copper
Ans:
Zinc and Copper
Explanation :
Brass is an alloy of copper and zinc, in proportions which can be varied to achieve varying mechanical and electrical properties.
[12] "Bhopal gas tragedy" 1984 is related to –
A.
Aluminium Phosphide
B.
Methyl bromide
C.
Methyl isocyanate
D.
Carbon dioxide
Ans:
Methyl isocyanate
Explanation :
In the Bhopal disaster which took place on 2-3 December, 1984 over 500,000 people were exposed to methyl isocyanate gas and other chemicals. The toxic substance made its way in and around the shantytowns located near the plant.
[13] The percentage of nitrogen present in ammonium sulphate is –
A.
0.27
B.
0.25
C.
0.305
D.
0.18
Ans:
0.27
Explanation :
Ammonium sulfate, (NH4)4SO4 contains 21% nitrogen as ammonium cations, and 24% sulfur as sulfate anions. It is an inorganic salt which is most commonly used as a soil fertilizer.
[14] Surface water is a better source of drinking water because it is poor in -
A.
Dust
B.
Bacteria
C.
Arsenic
D.
Algae
Ans:
Arsenic
Explanation :
Surface water is a better source of drinking water because it is poor in arsenic.
[15] Saturated hydrocarbons are called -
A.
Alkynes
B.
Alkenes
C.
Alkanes
D.
All of the above
Ans:
Alkanes
Explanation :
Carbon compounds which contain just carbon and hydrogen are called hydrocarbons. Among these, the saturated hydrocarbons are called alkanes. The unsaturated hydrocarbons which contain one or more double bonds are called alkenes.
[16] Which one of the following elements is polyatomic?
A.
Argon
B.
Sodium
C.
Sulphur
D.
Oxygen
Ans:
Sulphur
Explanation :
The term polyatomic is used for a molecule or an ion which contains either two or more than two atoms.
[17] Which of the following is not a chemical reaction?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
Water boiling is a physical reaction only because during physical reaction there is a change of state but during chemical reaction there is breaking or making of bonds.
[18] Which type of fire extinguisher is used for petroleum fire?
A.
Foam type
B.
Soda acid type
C.
Powder type
D.
None of these
Ans:
Foam type
Explanation :
Foam type fire extinguishers are suitable for fires that involve flammable or combustible liquids, including petrol, grease, and oil. They are applied to fuel fires as either an aspirated (mixed & expanded with air in a branch pipe) or nonaspirated form to form a frothy blanket or seal over the fuel, preventing oxygen reaching it. Powder types are useful for combustible metals.
[19] The function of skimming tank in sewage treatment is to remove –
A.
oil and fatty substances
B.
suspended solids
C.
gritty substances
D.
inorganic substances
Ans:
oil and fatty substances
Explanation :
Oil and grease traps are small size skimming basins provided to remove oil and grease and other small floating materials such as fats, vegetable debris, fruit skins, etc. It is so designed that lighter materials like grease and oil content of wastewater rise to the surface of wastewater and remains on top of liquid until removed.
[20] Who discovered Oxygen?
A.
Carl Scheele
B.
Hooke
C.
Heisenberg
D.
Williams
Ans:
Carl Scheele
Explanation :
Oxygen was discovered for the first time by a Swedish Chemist, Carl Wilhelm Scheele in 1772.He called the gas "fire air".
[21] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Hydrogen peroxide
D.
Heavy water
Ans:
Heavy water
Explanation :
A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator.
[22] Which one of the following is used as preservative for foodstuff?
A.
Sodium Benzoate
B.
Picric acid
C.
Glycerine
D.
Sodium Chloride
Ans:
Sodium Benzoate
Explanation :
Sodium benzoate is a preservative. It is bacteriostatic and fungistatic under acidic conditions. It is most widely used in acidic foods such as salad dressings (vinegar), carbonated drinks (carbonic acid), jams and fruit juices (citric acid), pickles (vinegar), and condiments. It is also used as a preservative in medicines and cosmetics.
[23] The element with highest first ionization energy is -
A.
hydrogen
B.
helium
C.
lithium
D.
sodium
Ans:
helium
Explanation :
The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
[24] The chief source of naphthalene is –
A.
Coal-tear
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tear
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[25] KMnO4 can be used as a/an -
A.
insecticide
B.
fertiliser
C.
pesticide
D.
disinfectant
Ans:
disinfectant
Explanation :
Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry.
Explanation :
Brass is an alloy of copper and zinc, in proportions which can be varied to achieve varying mechanical and electrical properties.
[12] "Bhopal gas tragedy" 1984 is related to –
A.
Aluminium Phosphide
B.
Methyl bromide
C.
Methyl isocyanate
D.
Carbon dioxide
Ans:
Methyl isocyanate
Explanation :
In the Bhopal disaster which took place on 2-3 December, 1984 over 500,000 people were exposed to methyl isocyanate gas and other chemicals. The toxic substance made its way in and around the shantytowns located near the plant.
[13] The percentage of nitrogen present in ammonium sulphate is –
A.
0.27
B.
0.25
C.
0.305
D.
0.18
Ans:
0.27
Explanation :
Ammonium sulfate, (NH4)4SO4 contains 21% nitrogen as ammonium cations, and 24% sulfur as sulfate anions. It is an inorganic salt which is most commonly used as a soil fertilizer.
[14] Surface water is a better source of drinking water because it is poor in -
A.
Dust
B.
Bacteria
C.
Arsenic
D.
Algae
Ans:
Arsenic
Explanation :
Surface water is a better source of drinking water because it is poor in arsenic.
[15] Saturated hydrocarbons are called -
A.
Alkynes
B.
Alkenes
C.
Alkanes
D.
All of the above
Ans:
Alkanes
Explanation :
Carbon compounds which contain just carbon and hydrogen are called hydrocarbons. Among these, the saturated hydrocarbons are called alkanes. The unsaturated hydrocarbons which contain one or more double bonds are called alkenes.
[16] Which one of the following elements is polyatomic?
A.
Argon
B.
Sodium
C.
Sulphur
D.
Oxygen
Ans:
Sulphur
Explanation :
The term polyatomic is used for a molecule or an ion which contains either two or more than two atoms.
[17] Which of the following is not a chemical reaction?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
Water boiling is a physical reaction only because during physical reaction there is a change of state but during chemical reaction there is breaking or making of bonds.
[18] Which type of fire extinguisher is used for petroleum fire?
A.
Foam type
B.
Soda acid type
C.
Powder type
D.
None of these
Ans:
Foam type
Explanation :
Foam type fire extinguishers are suitable for fires that involve flammable or combustible liquids, including petrol, grease, and oil. They are applied to fuel fires as either an aspirated (mixed & expanded with air in a branch pipe) or nonaspirated form to form a frothy blanket or seal over the fuel, preventing oxygen reaching it. Powder types are useful for combustible metals.
[19] The function of skimming tank in sewage treatment is to remove –
A.
oil and fatty substances
B.
suspended solids
C.
gritty substances
D.
inorganic substances
Ans:
oil and fatty substances
Explanation :
Oil and grease traps are small size skimming basins provided to remove oil and grease and other small floating materials such as fats, vegetable debris, fruit skins, etc. It is so designed that lighter materials like grease and oil content of wastewater rise to the surface of wastewater and remains on top of liquid until removed.
[20] Who discovered Oxygen?
A.
Carl Scheele
B.
Hooke
C.
Heisenberg
D.
Williams
Ans:
Carl Scheele
Explanation :
Oxygen was discovered for the first time by a Swedish Chemist, Carl Wilhelm Scheele in 1772.He called the gas "fire air".
[21] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Hydrogen peroxide
D.
Heavy water
Ans:
Heavy water
Explanation :
A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator.
[22] Which one of the following is used as preservative for foodstuff?
A.
Sodium Benzoate
B.
Picric acid
C.
Glycerine
D.
Sodium Chloride
Ans:
Sodium Benzoate
Explanation :
Sodium benzoate is a preservative. It is bacteriostatic and fungistatic under acidic conditions. It is most widely used in acidic foods such as salad dressings (vinegar), carbonated drinks (carbonic acid), jams and fruit juices (citric acid), pickles (vinegar), and condiments. It is also used as a preservative in medicines and cosmetics.
[23] The element with highest first ionization energy is -
A.
hydrogen
B.
helium
C.
lithium
D.
sodium
Ans:
helium
Explanation :
The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
[24] The chief source of naphthalene is –
A.
Coal-tear
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tear
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[25] KMnO4 can be used as a/an -
A.
insecticide
B.
fertiliser
C.
pesticide
D.
disinfectant
Ans:
disinfectant
Explanation :
Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry.
Explanation :
Ammonium sulfate, (NH4)4SO4 contains 21% nitrogen as ammonium cations, and 24% sulfur as sulfate anions. It is an inorganic salt which is most commonly used as a soil fertilizer.
[14] Surface water is a better source of drinking water because it is poor in -
A.
Dust
B.
Bacteria
C.
Arsenic
D.
Algae
Ans:
Arsenic
Explanation :
Surface water is a better source of drinking water because it is poor in arsenic.
[15] Saturated hydrocarbons are called -
A.
Alkynes
B.
Alkenes
C.
Alkanes
D.
All of the above
Ans:
Alkanes
Explanation :
Carbon compounds which contain just carbon and hydrogen are called hydrocarbons. Among these, the saturated hydrocarbons are called alkanes. The unsaturated hydrocarbons which contain one or more double bonds are called alkenes.
[16] Which one of the following elements is polyatomic?
A.
Argon
B.
Sodium
C.
Sulphur
D.
Oxygen
Ans:
Sulphur
Explanation :
The term polyatomic is used for a molecule or an ion which contains either two or more than two atoms.
[17] Which of the following is not a chemical reaction?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
Water boiling is a physical reaction only because during physical reaction there is a change of state but during chemical reaction there is breaking or making of bonds.
[18] Which type of fire extinguisher is used for petroleum fire?
A.
Foam type
B.
Soda acid type
C.
Powder type
D.
None of these
Ans:
Foam type
Explanation :
Foam type fire extinguishers are suitable for fires that involve flammable or combustible liquids, including petrol, grease, and oil. They are applied to fuel fires as either an aspirated (mixed & expanded with air in a branch pipe) or nonaspirated form to form a frothy blanket or seal over the fuel, preventing oxygen reaching it. Powder types are useful for combustible metals.
[19] The function of skimming tank in sewage treatment is to remove –
A.
oil and fatty substances
B.
suspended solids
C.
gritty substances
D.
inorganic substances
Ans:
oil and fatty substances
Explanation :
Oil and grease traps are small size skimming basins provided to remove oil and grease and other small floating materials such as fats, vegetable debris, fruit skins, etc. It is so designed that lighter materials like grease and oil content of wastewater rise to the surface of wastewater and remains on top of liquid until removed.
[20] Who discovered Oxygen?
A.
Carl Scheele
B.
Hooke
C.
Heisenberg
D.
Williams
Ans:
Carl Scheele
Explanation :
Oxygen was discovered for the first time by a Swedish Chemist, Carl Wilhelm Scheele in 1772.He called the gas "fire air".
[21] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Hydrogen peroxide
D.
Heavy water
Ans:
Heavy water
Explanation :
A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator.
[22] Which one of the following is used as preservative for foodstuff?
A.
Sodium Benzoate
B.
Picric acid
C.
Glycerine
D.
Sodium Chloride
Ans:
Sodium Benzoate
Explanation :
Sodium benzoate is a preservative. It is bacteriostatic and fungistatic under acidic conditions. It is most widely used in acidic foods such as salad dressings (vinegar), carbonated drinks (carbonic acid), jams and fruit juices (citric acid), pickles (vinegar), and condiments. It is also used as a preservative in medicines and cosmetics.
[23] The element with highest first ionization energy is -
A.
hydrogen
B.
helium
C.
lithium
D.
sodium
Ans:
helium
Explanation :
The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
[24] The chief source of naphthalene is –
A.
Coal-tear
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tear
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[25] KMnO4 can be used as a/an -
A.
insecticide
B.
fertiliser
C.
pesticide
D.
disinfectant
Ans:
disinfectant
Explanation :
Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry.
Explanation :
Carbon compounds which contain just carbon and hydrogen are called hydrocarbons. Among these, the saturated hydrocarbons are called alkanes. The unsaturated hydrocarbons which contain one or more double bonds are called alkenes.
[16] Which one of the following elements is polyatomic?
A.
Argon
B.
Sodium
C.
Sulphur
D.
Oxygen
Ans:
Sulphur
Explanation :
The term polyatomic is used for a molecule or an ion which contains either two or more than two atoms.
[17] Which of the following is not a chemical reaction?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
Water boiling is a physical reaction only because during physical reaction there is a change of state but during chemical reaction there is breaking or making of bonds.
[18] Which type of fire extinguisher is used for petroleum fire?
A.
Foam type
B.
Soda acid type
C.
Powder type
D.
None of these
Ans:
Foam type
Explanation :
Foam type fire extinguishers are suitable for fires that involve flammable or combustible liquids, including petrol, grease, and oil. They are applied to fuel fires as either an aspirated (mixed & expanded with air in a branch pipe) or nonaspirated form to form a frothy blanket or seal over the fuel, preventing oxygen reaching it. Powder types are useful for combustible metals.
[19] The function of skimming tank in sewage treatment is to remove –
A.
oil and fatty substances
B.
suspended solids
C.
gritty substances
D.
inorganic substances
Ans:
oil and fatty substances
Explanation :
Oil and grease traps are small size skimming basins provided to remove oil and grease and other small floating materials such as fats, vegetable debris, fruit skins, etc. It is so designed that lighter materials like grease and oil content of wastewater rise to the surface of wastewater and remains on top of liquid until removed.
[20] Who discovered Oxygen?
A.
Carl Scheele
B.
Hooke
C.
Heisenberg
D.
Williams
Ans:
Carl Scheele
Explanation :
Oxygen was discovered for the first time by a Swedish Chemist, Carl Wilhelm Scheele in 1772.He called the gas "fire air".
[21] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Hydrogen peroxide
D.
Heavy water
Ans:
Heavy water
Explanation :
A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator.
[22] Which one of the following is used as preservative for foodstuff?
A.
Sodium Benzoate
B.
Picric acid
C.
Glycerine
D.
Sodium Chloride
Ans:
Sodium Benzoate
Explanation :
Sodium benzoate is a preservative. It is bacteriostatic and fungistatic under acidic conditions. It is most widely used in acidic foods such as salad dressings (vinegar), carbonated drinks (carbonic acid), jams and fruit juices (citric acid), pickles (vinegar), and condiments. It is also used as a preservative in medicines and cosmetics.
[23] The element with highest first ionization energy is -
A.
hydrogen
B.
helium
C.
lithium
D.
sodium
Ans:
helium
Explanation :
The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
[24] The chief source of naphthalene is –
A.
Coal-tear
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tear
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[25] KMnO4 can be used as a/an -
A.
insecticide
B.
fertiliser
C.
pesticide
D.
disinfectant
Ans:
disinfectant
Explanation :
Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry.
Explanation :
Water boiling is a physical reaction only because during physical reaction there is a change of state but during chemical reaction there is breaking or making of bonds.
[18] Which type of fire extinguisher is used for petroleum fire?
A.
Foam type
B.
Soda acid type
C.
Powder type
D.
None of these
Ans:
Foam type
Explanation :
Foam type fire extinguishers are suitable for fires that involve flammable or combustible liquids, including petrol, grease, and oil. They are applied to fuel fires as either an aspirated (mixed & expanded with air in a branch pipe) or nonaspirated form to form a frothy blanket or seal over the fuel, preventing oxygen reaching it. Powder types are useful for combustible metals.
[19] The function of skimming tank in sewage treatment is to remove –
A.
oil and fatty substances
B.
suspended solids
C.
gritty substances
D.
inorganic substances
Ans:
oil and fatty substances
Explanation :
Oil and grease traps are small size skimming basins provided to remove oil and grease and other small floating materials such as fats, vegetable debris, fruit skins, etc. It is so designed that lighter materials like grease and oil content of wastewater rise to the surface of wastewater and remains on top of liquid until removed.
[20] Who discovered Oxygen?
A.
Carl Scheele
B.
Hooke
C.
Heisenberg
D.
Williams
Ans:
Carl Scheele
Explanation :
Oxygen was discovered for the first time by a Swedish Chemist, Carl Wilhelm Scheele in 1772.He called the gas "fire air".
[21] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Hydrogen peroxide
D.
Heavy water
Ans:
Heavy water
Explanation :
A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator.
[22] Which one of the following is used as preservative for foodstuff?
A.
Sodium Benzoate
B.
Picric acid
C.
Glycerine
D.
Sodium Chloride
Ans:
Sodium Benzoate
Explanation :
Sodium benzoate is a preservative. It is bacteriostatic and fungistatic under acidic conditions. It is most widely used in acidic foods such as salad dressings (vinegar), carbonated drinks (carbonic acid), jams and fruit juices (citric acid), pickles (vinegar), and condiments. It is also used as a preservative in medicines and cosmetics.
[23] The element with highest first ionization energy is -
A.
hydrogen
B.
helium
C.
lithium
D.
sodium
Ans:
helium
Explanation :
The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
[24] The chief source of naphthalene is –
A.
Coal-tear
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tear
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[25] KMnO4 can be used as a/an -
A.
insecticide
B.
fertiliser
C.
pesticide
D.
disinfectant
Ans:
disinfectant
Explanation :
Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry.
Explanation :
Oil and grease traps are small size skimming basins provided to remove oil and grease and other small floating materials such as fats, vegetable debris, fruit skins, etc. It is so designed that lighter materials like grease and oil content of wastewater rise to the surface of wastewater and remains on top of liquid until removed.
[20] Who discovered Oxygen?
A.
Carl Scheele
B.
Hooke
C.
Heisenberg
D.
Williams
Ans:
Carl Scheele
Explanation :
Oxygen was discovered for the first time by a Swedish Chemist, Carl Wilhelm Scheele in 1772.He called the gas "fire air".
[21] Which one among the following is used as a moderator in nuclear reactors?
A.
Ozone
B.
Heavy hydrogen
C.
Hydrogen peroxide
D.
Heavy water
Ans:
Heavy water
Explanation :
A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator.
[22] Which one of the following is used as preservative for foodstuff?
A.
Sodium Benzoate
B.
Picric acid
C.
Glycerine
D.
Sodium Chloride
Ans:
Sodium Benzoate
Explanation :
Sodium benzoate is a preservative. It is bacteriostatic and fungistatic under acidic conditions. It is most widely used in acidic foods such as salad dressings (vinegar), carbonated drinks (carbonic acid), jams and fruit juices (citric acid), pickles (vinegar), and condiments. It is also used as a preservative in medicines and cosmetics.
[23] The element with highest first ionization energy is -
A.
hydrogen
B.
helium
C.
lithium
D.
sodium
Ans:
helium
Explanation :
The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
[24] The chief source of naphthalene is –
A.
Coal-tear
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tear
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[25] KMnO4 can be used as a/an -
A.
insecticide
B.
fertiliser
C.
pesticide
D.
disinfectant
Ans:
disinfectant
Explanation :
Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry.
Explanation :
A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator.
[22] Which one of the following is used as preservative for foodstuff?
A.
Sodium Benzoate
B.
Picric acid
C.
Glycerine
D.
Sodium Chloride
Ans:
Sodium Benzoate
Explanation :
Sodium benzoate is a preservative. It is bacteriostatic and fungistatic under acidic conditions. It is most widely used in acidic foods such as salad dressings (vinegar), carbonated drinks (carbonic acid), jams and fruit juices (citric acid), pickles (vinegar), and condiments. It is also used as a preservative in medicines and cosmetics.
[23] The element with highest first ionization energy is -
A.
hydrogen
B.
helium
C.
lithium
D.
sodium
Ans:
helium
Explanation :
The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
[24] The chief source of naphthalene is –
A.
Coal-tear
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tear
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[25] KMnO4 can be used as a/an -
A.
insecticide
B.
fertiliser
C.
pesticide
D.
disinfectant
Ans:
disinfectant
Explanation :
Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry.
Explanation :
The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
[24] The chief source of naphthalene is –
A.
Coal-tear
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tear
Explanation :
Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar).
[25] KMnO4 can be used as a/an -
A.
insecticide
B.
fertiliser
C.
pesticide
D.
disinfectant
Ans:
disinfectant
Explanation :
Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry.
Explanation :
Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry.