[1] Among the following the hardest metal is –
A.
Gold
B.
Iron
C.
Platinum
D.
Tungsten
Ans:
Tungsten
Explanation :
Titanium is the hardest natural metal in the world. It is very strong, three times the strength of steel and much stronger than gold, silver and platinum and yet is very light weight. Tungsten carbide is the hardest metal alloy on Earth and is scratch proof under normal wear. Tungsten carbide is two times as hard as steel and four times as hard as titanium.
[2] Hardest allotrope of carbon is -
A.
diamond
B.
graphite
C.
coke
D.
lamp black
Ans:
diamond
Explanation :
Diamond is one well known allotrope of carbon. The hardness and high dispersion of light of diamond make it useful for both industrial applications and jewellery. Diamond is the hardest known natural mineral. This makes it an excellent abrasive and makes it hold polish and luster extremely well.
[3] The depletion of ozone layer is due to -
A.
chloro fluoro carbon
B.
carbon dioxide
C.
sulphur dioxide
D.
ethane
Ans:
chloro fluoro carbon
Explanation :
A chlorofluorocarbon (CFC) is an organic compound that contains only carbon, chlorine, hydrogen and fluorine, produced as a volatile derivative of methane and ethane. The manufacture of such compounds has been phased out (and replaced with products such as R-4104 by the Montreal Protocol because they contribute to ozone depletion in the upper atmosphere.
[4] Sodium bicarbonate is commercially known as –
A.
Washing soda
B.
Baking soda
C.
Caustic soda
D.
Soda lime
Ans:
Baking soda
Explanation :
Baking Soda is Sodium bicarbonate or sodium hydrogen carbonate. It is primarily used in cooking (baking), as a leavening agent. It reacts with acidic components in batters, releasing carbon dioxide, which causes expansion of the batter and forms the characteristic texture and grain in pancakes, cakes, quick breads, soda bread, and other baked and fried foods.
[5] Coal is formed from –
A.
crude oil
B.
deposit of animal waste
C.
coke
D.
compressed and hardened biomass
Ans:
compressed and hardened biomass
Explanation :
A fossil fuel, coal forms when dead plant matter is converted into peat, which in turn is converted into lignite, then sub-bituminous coal, after that bituminous coal, and lastly anthracite: This involves biological and geological processes that take place over a long period.
[6] An example of semiconductor is -
A.
German silver
B.
Germanium
C.
Phosphorous
D.
Arsenic
Ans:
Germanium
Explanation :
Purified germanium is a semiconductor, with appearance most similar to elemental silicon. Like silicon, germanium naturally reacts and forms complexes with oxygen in nature. Unlike silicon, it is too reactive to be found naturally on Earth in the free (native) state.
[7] Non-stick kitchenwares are coated with –
A.
PVC
B.
Graphite
C.
Teflon
D.
Silicon
Ans:
Teflon
Explanation :
Polytetrafluoroethylene (FYIFE) is a synthetic fluoropolymer of tetrafluoroethylene that finds numerous applications. The best known brand name of FIFE is Teflon. PTFE is used as a non-stick coating for pans and other cookware as it is hydrophobic and possesses fairly high heat resistance.
[8] 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.
[9] ‘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.
[10] The material used in the manufacture of lead pencil is –
A.
Graphite
B.
Lead
C.
Carbon
D.
Mica
Ans:
Graphite
Explanation :
Pencils create marks via physical abrasion, leaving behind a trail of solid core material that adheres to a sheet of paper or other surface. They are noticeably distinct from pens, which dispense liquid or gel ink that stain the light colour of the paper. Most pencil cores are made of graphite mixed with a clay binder, leaving grey or black marks that can be easily erased.
[11] If all bullets could not be removed from gunshot injury of a man, it may cause poisoning by –
A.
Mercury
B.
Lead
C.
Iron
D.
Arsenic
Ans:
Lead
Explanation :
Lead is used in building construction, lead-acid batteries, bullets and shot, weights, as part of soldiers, pewters, fusible alloys, and as a radiation shield. Lead has the highest atomic number of all of the stable elements, although the next higher element, bismuth, has a half-life that is so long (much longer than the age of the universe) that it can be considered stable. Its four stable isotopes have 82 protons, a magic number in the nuclear shell model of atomic nuclei.
[12] Nail polish remover contains?
A.
Benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
acetone
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
[13] Which of the following metals is NOT obtained by reduction using carbon?
A.
Copper
B.
Sodium
C.
Iron
D.
Zinc
Ans:
Sodium
Explanation :
Metals such as zinc, iron and copper are present in ores as their oxides. Each of these oxides is heated with carbon to obtain the metal.
[14] One of the following is used to dissolve noble metals. That is –
A.
Nitric acid
B.
Hydrochloric acid
C.
Sulphuric acid
D.
Aqua ragia
Ans:
Aqua ragia
Explanation :
Aqua regia ("royal water"), aqua aegis ("king's water"), or nitro-hydrochloric acid is a highly corrosive mixture of acids, a fuming yellow or red solution. The mixture is formed by freshly mixing concentrated nitric acid and hydrochloric acid, usually in a volume ratio of 1:3. It was named so because it can dissolve the so-called royal or noble metals, gold and platinum. However, titanium, iridium, ruthenium, tantalum, osmium, rhodium and a few other metals are capable of withstanding its corrosive properties.
[15] Water can be separated from alcohol water mixture by –
A.
decantation
B.
evaporation
C.
distillation
D.
sublimation
Ans:
distillation
Explanation :
Distillation is a method of separating mixtures based on differences in volatilities of components in a boiling liquid mixture. Distillation is a unit operation, or a physical separation process, and not a chemical reaction. Commercially, distillation has a number of applications. It is used to separate crude oil into more fractions for specific uses such as transport, power generation and heating. Water is distilled to remove impurities, such as salt from seawater. Air is distilled to separate its components— notably oxygen, nitrogen, and argon— for industrial use.
[16] 'Milk Sugar' is –
A.
Lactose
B.
Maltose
C.
Galactose
D.
Sucrose
Ans:
Lactose
Explanation :
Lactose is a disaccharide. It is a sugar composed of galactose and glucose subunits and has the molecular formula C₁₂H₂₂O₁₁. Lactose makes up around 2–8% of milk. The name comes from lac, the Latin word for milk, plus the suffix -ose used to name sugars.
[17] Which of the following is not a nitrogenous fertilizer?
A.
Ammonium sulphate
B.
Urea
C.
Ammonium nitrate
D.
Superphosphate
Ans:
Superphosphate
Explanation :
Superphosphate is a common synthetic phosphorus fertilizer. It contains phosphorus and sulphur in a ratio of 1 to 1.22. It is produced by treatment of “phosphate rock” with acids such as sulphuric acid. Superphosphate is the principal carrier of phosphate, the form of phosphorus usable by plants, and is one of the world’s most important fertilizers.
[18] Which of the following is chief source of Naphthalene?
A.
Moth balls
B.
Moth flakes
C.
Tar Camphor
D.
Coal-tar
Ans:
Tar Camphor
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).
[19] Which of the following is the petroleum wax?
A.
Bees wax
B.
Carnauba wax
C.
Paraffin wax
D.
Jojoba wax
Ans:
Paraffin wax
Explanation :
Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 °C (113 °F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Although most natural waxes are esters, paraffin waxes are hydrocarbons, Paraffin waxes are mixtures of saturated and iso-alkanes, naphthenes, and alkyl- and naphthene-substituted aromatic compounds.
[20] Which variety of coal contains recognizable traces of the original plant material?
A.
Anthracite
B.
Lignite
C.
Peat
D.
Bitumen
Ans:
Peat
Explanation :
Peat contains recognizable traces of the original plant material. Initially the peat is converted into lignite or 'brown coal' - these are coal-types with low organic maturity. In comparison to other coals, lignite is quite soft and its colour can range from dark black to various shades of brown.
[21] Sodium calcium silicate is called .
A.
Hard glass
B.
Borosilicate glass
C.
Soft glass
D.
Jena glass
Ans:
Soft glass
Explanation :
Ordinary glass which is also known as soda glass or soft glass is a mixture of sodium silicate, Calcium silicate, and Silica.
[22] A gas used as a disinfectant in drinking water is -
A.
Hydrogen
B.
Oxygen
C.
Fluorine
D.
Chlorine
Ans:
Chlorine
Explanation :
Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water.
[23] Who developed atom bomb?
A.
Warn& Wan Brown
B.
J. Robert Openheimer
C.
Edward Taylor
D.
Samuel Koehen
Ans:
J. Robert Openheimer
Explanation :
J. (Julius) Robert Oppenheimer was born in New York City on April 22, 1904. Under Oppenheimer's guidance, the laboratories at Los Alamos were constructed. There, he brought the best minds in physics to work on the problem of creating an atomic bomb. In the end, he was managing; more than 3,000 people, as well as tackling theoretical and mechanical problems that arose. He is often referred to as the "father" of the atomic bomb.
[24] The major harmful gas emitted by automobile vehicle which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood’s ability to carry oxygen; overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[25] Humburger effect is otherwise known as-
A.
Sodium pump
B.
Anaerobic metabolism
C.
Choloride shift
D.
Respiratory product
Ans:
Choloride shift
Explanation :
Hamburger shift (also known as the Chloride shift) is a process which occurs in the cardiovascular system and refers to the exchange of bicarbonate (HCO3-) and chloride (Cl-) across the membrane of red blood cells.
Explanation :
Titanium is the hardest natural metal in the world. It is very strong, three times the strength of steel and much stronger than gold, silver and platinum and yet is very light weight. Tungsten carbide is the hardest metal alloy on Earth and is scratch proof under normal wear. Tungsten carbide is two times as hard as steel and four times as hard as titanium.
[2] Hardest allotrope of carbon is -
A.
diamond
B.
graphite
C.
coke
D.
lamp black
Ans:
diamond
Explanation :
Diamond is one well known allotrope of carbon. The hardness and high dispersion of light of diamond make it useful for both industrial applications and jewellery. Diamond is the hardest known natural mineral. This makes it an excellent abrasive and makes it hold polish and luster extremely well.
[3] The depletion of ozone layer is due to -
A.
chloro fluoro carbon
B.
carbon dioxide
C.
sulphur dioxide
D.
ethane
Ans:
chloro fluoro carbon
Explanation :
A chlorofluorocarbon (CFC) is an organic compound that contains only carbon, chlorine, hydrogen and fluorine, produced as a volatile derivative of methane and ethane. The manufacture of such compounds has been phased out (and replaced with products such as R-4104 by the Montreal Protocol because they contribute to ozone depletion in the upper atmosphere.
[4] Sodium bicarbonate is commercially known as –
A.
Washing soda
B.
Baking soda
C.
Caustic soda
D.
Soda lime
Ans:
Baking soda
Explanation :
Baking Soda is Sodium bicarbonate or sodium hydrogen carbonate. It is primarily used in cooking (baking), as a leavening agent. It reacts with acidic components in batters, releasing carbon dioxide, which causes expansion of the batter and forms the characteristic texture and grain in pancakes, cakes, quick breads, soda bread, and other baked and fried foods.
[5] Coal is formed from –
A.
crude oil
B.
deposit of animal waste
C.
coke
D.
compressed and hardened biomass
Ans:
compressed and hardened biomass
Explanation :
A fossil fuel, coal forms when dead plant matter is converted into peat, which in turn is converted into lignite, then sub-bituminous coal, after that bituminous coal, and lastly anthracite: This involves biological and geological processes that take place over a long period.
[6] An example of semiconductor is -
A.
German silver
B.
Germanium
C.
Phosphorous
D.
Arsenic
Ans:
Germanium
Explanation :
Purified germanium is a semiconductor, with appearance most similar to elemental silicon. Like silicon, germanium naturally reacts and forms complexes with oxygen in nature. Unlike silicon, it is too reactive to be found naturally on Earth in the free (native) state.
[7] Non-stick kitchenwares are coated with –
A.
PVC
B.
Graphite
C.
Teflon
D.
Silicon
Ans:
Teflon
Explanation :
Polytetrafluoroethylene (FYIFE) is a synthetic fluoropolymer of tetrafluoroethylene that finds numerous applications. The best known brand name of FIFE is Teflon. PTFE is used as a non-stick coating for pans and other cookware as it is hydrophobic and possesses fairly high heat resistance.
[8] 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.
[9] ‘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.
[10] The material used in the manufacture of lead pencil is –
A.
Graphite
B.
Lead
C.
Carbon
D.
Mica
Ans:
Graphite
Explanation :
Pencils create marks via physical abrasion, leaving behind a trail of solid core material that adheres to a sheet of paper or other surface. They are noticeably distinct from pens, which dispense liquid or gel ink that stain the light colour of the paper. Most pencil cores are made of graphite mixed with a clay binder, leaving grey or black marks that can be easily erased.
[11] If all bullets could not be removed from gunshot injury of a man, it may cause poisoning by –
A.
Mercury
B.
Lead
C.
Iron
D.
Arsenic
Ans:
Lead
Explanation :
Lead is used in building construction, lead-acid batteries, bullets and shot, weights, as part of soldiers, pewters, fusible alloys, and as a radiation shield. Lead has the highest atomic number of all of the stable elements, although the next higher element, bismuth, has a half-life that is so long (much longer than the age of the universe) that it can be considered stable. Its four stable isotopes have 82 protons, a magic number in the nuclear shell model of atomic nuclei.
[12] Nail polish remover contains?
A.
Benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
acetone
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
[13] Which of the following metals is NOT obtained by reduction using carbon?
A.
Copper
B.
Sodium
C.
Iron
D.
Zinc
Ans:
Sodium
Explanation :
Metals such as zinc, iron and copper are present in ores as their oxides. Each of these oxides is heated with carbon to obtain the metal.
[14] One of the following is used to dissolve noble metals. That is –
A.
Nitric acid
B.
Hydrochloric acid
C.
Sulphuric acid
D.
Aqua ragia
Ans:
Aqua ragia
Explanation :
Aqua regia ("royal water"), aqua aegis ("king's water"), or nitro-hydrochloric acid is a highly corrosive mixture of acids, a fuming yellow or red solution. The mixture is formed by freshly mixing concentrated nitric acid and hydrochloric acid, usually in a volume ratio of 1:3. It was named so because it can dissolve the so-called royal or noble metals, gold and platinum. However, titanium, iridium, ruthenium, tantalum, osmium, rhodium and a few other metals are capable of withstanding its corrosive properties.
[15] Water can be separated from alcohol water mixture by –
A.
decantation
B.
evaporation
C.
distillation
D.
sublimation
Ans:
distillation
Explanation :
Distillation is a method of separating mixtures based on differences in volatilities of components in a boiling liquid mixture. Distillation is a unit operation, or a physical separation process, and not a chemical reaction. Commercially, distillation has a number of applications. It is used to separate crude oil into more fractions for specific uses such as transport, power generation and heating. Water is distilled to remove impurities, such as salt from seawater. Air is distilled to separate its components— notably oxygen, nitrogen, and argon— for industrial use.
[16] 'Milk Sugar' is –
A.
Lactose
B.
Maltose
C.
Galactose
D.
Sucrose
Ans:
Lactose
Explanation :
Lactose is a disaccharide. It is a sugar composed of galactose and glucose subunits and has the molecular formula C₁₂H₂₂O₁₁. Lactose makes up around 2–8% of milk. The name comes from lac, the Latin word for milk, plus the suffix -ose used to name sugars.
[17] Which of the following is not a nitrogenous fertilizer?
A.
Ammonium sulphate
B.
Urea
C.
Ammonium nitrate
D.
Superphosphate
Ans:
Superphosphate
Explanation :
Superphosphate is a common synthetic phosphorus fertilizer. It contains phosphorus and sulphur in a ratio of 1 to 1.22. It is produced by treatment of “phosphate rock” with acids such as sulphuric acid. Superphosphate is the principal carrier of phosphate, the form of phosphorus usable by plants, and is one of the world’s most important fertilizers.
[18] Which of the following is chief source of Naphthalene?
A.
Moth balls
B.
Moth flakes
C.
Tar Camphor
D.
Coal-tar
Ans:
Tar Camphor
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).
[19] Which of the following is the petroleum wax?
A.
Bees wax
B.
Carnauba wax
C.
Paraffin wax
D.
Jojoba wax
Ans:
Paraffin wax
Explanation :
Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 °C (113 °F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Although most natural waxes are esters, paraffin waxes are hydrocarbons, Paraffin waxes are mixtures of saturated and iso-alkanes, naphthenes, and alkyl- and naphthene-substituted aromatic compounds.
[20] Which variety of coal contains recognizable traces of the original plant material?
A.
Anthracite
B.
Lignite
C.
Peat
D.
Bitumen
Ans:
Peat
Explanation :
Peat contains recognizable traces of the original plant material. Initially the peat is converted into lignite or 'brown coal' - these are coal-types with low organic maturity. In comparison to other coals, lignite is quite soft and its colour can range from dark black to various shades of brown.
[21] Sodium calcium silicate is called .
A.
Hard glass
B.
Borosilicate glass
C.
Soft glass
D.
Jena glass
Ans:
Soft glass
Explanation :
Ordinary glass which is also known as soda glass or soft glass is a mixture of sodium silicate, Calcium silicate, and Silica.
[22] A gas used as a disinfectant in drinking water is -
A.
Hydrogen
B.
Oxygen
C.
Fluorine
D.
Chlorine
Ans:
Chlorine
Explanation :
Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water.
[23] Who developed atom bomb?
A.
Warn& Wan Brown
B.
J. Robert Openheimer
C.
Edward Taylor
D.
Samuel Koehen
Ans:
J. Robert Openheimer
Explanation :
J. (Julius) Robert Oppenheimer was born in New York City on April 22, 1904. Under Oppenheimer's guidance, the laboratories at Los Alamos were constructed. There, he brought the best minds in physics to work on the problem of creating an atomic bomb. In the end, he was managing; more than 3,000 people, as well as tackling theoretical and mechanical problems that arose. He is often referred to as the "father" of the atomic bomb.
[24] The major harmful gas emitted by automobile vehicle which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood’s ability to carry oxygen; overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[25] Humburger effect is otherwise known as-
A.
Sodium pump
B.
Anaerobic metabolism
C.
Choloride shift
D.
Respiratory product
Ans:
Choloride shift
Explanation :
Hamburger shift (also known as the Chloride shift) is a process which occurs in the cardiovascular system and refers to the exchange of bicarbonate (HCO3-) and chloride (Cl-) across the membrane of red blood cells.
Explanation :
A chlorofluorocarbon (CFC) is an organic compound that contains only carbon, chlorine, hydrogen and fluorine, produced as a volatile derivative of methane and ethane. The manufacture of such compounds has been phased out (and replaced with products such as R-4104 by the Montreal Protocol because they contribute to ozone depletion in the upper atmosphere.
[4] Sodium bicarbonate is commercially known as –
A.
Washing soda
B.
Baking soda
C.
Caustic soda
D.
Soda lime
Ans:
Baking soda
Explanation :
Baking Soda is Sodium bicarbonate or sodium hydrogen carbonate. It is primarily used in cooking (baking), as a leavening agent. It reacts with acidic components in batters, releasing carbon dioxide, which causes expansion of the batter and forms the characteristic texture and grain in pancakes, cakes, quick breads, soda bread, and other baked and fried foods.
[5] Coal is formed from –
A.
crude oil
B.
deposit of animal waste
C.
coke
D.
compressed and hardened biomass
Ans:
compressed and hardened biomass
Explanation :
A fossil fuel, coal forms when dead plant matter is converted into peat, which in turn is converted into lignite, then sub-bituminous coal, after that bituminous coal, and lastly anthracite: This involves biological and geological processes that take place over a long period.
[6] An example of semiconductor is -
A.
German silver
B.
Germanium
C.
Phosphorous
D.
Arsenic
Ans:
Germanium
Explanation :
Purified germanium is a semiconductor, with appearance most similar to elemental silicon. Like silicon, germanium naturally reacts and forms complexes with oxygen in nature. Unlike silicon, it is too reactive to be found naturally on Earth in the free (native) state.
[7] Non-stick kitchenwares are coated with –
A.
PVC
B.
Graphite
C.
Teflon
D.
Silicon
Ans:
Teflon
Explanation :
Polytetrafluoroethylene (FYIFE) is a synthetic fluoropolymer of tetrafluoroethylene that finds numerous applications. The best known brand name of FIFE is Teflon. PTFE is used as a non-stick coating for pans and other cookware as it is hydrophobic and possesses fairly high heat resistance.
[8] 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.
[9] ‘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.
[10] The material used in the manufacture of lead pencil is –
A.
Graphite
B.
Lead
C.
Carbon
D.
Mica
Ans:
Graphite
Explanation :
Pencils create marks via physical abrasion, leaving behind a trail of solid core material that adheres to a sheet of paper or other surface. They are noticeably distinct from pens, which dispense liquid or gel ink that stain the light colour of the paper. Most pencil cores are made of graphite mixed with a clay binder, leaving grey or black marks that can be easily erased.
[11] If all bullets could not be removed from gunshot injury of a man, it may cause poisoning by –
A.
Mercury
B.
Lead
C.
Iron
D.
Arsenic
Ans:
Lead
Explanation :
Lead is used in building construction, lead-acid batteries, bullets and shot, weights, as part of soldiers, pewters, fusible alloys, and as a radiation shield. Lead has the highest atomic number of all of the stable elements, although the next higher element, bismuth, has a half-life that is so long (much longer than the age of the universe) that it can be considered stable. Its four stable isotopes have 82 protons, a magic number in the nuclear shell model of atomic nuclei.
[12] Nail polish remover contains?
A.
Benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
acetone
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
[13] Which of the following metals is NOT obtained by reduction using carbon?
A.
Copper
B.
Sodium
C.
Iron
D.
Zinc
Ans:
Sodium
Explanation :
Metals such as zinc, iron and copper are present in ores as their oxides. Each of these oxides is heated with carbon to obtain the metal.
[14] One of the following is used to dissolve noble metals. That is –
A.
Nitric acid
B.
Hydrochloric acid
C.
Sulphuric acid
D.
Aqua ragia
Ans:
Aqua ragia
Explanation :
Aqua regia ("royal water"), aqua aegis ("king's water"), or nitro-hydrochloric acid is a highly corrosive mixture of acids, a fuming yellow or red solution. The mixture is formed by freshly mixing concentrated nitric acid and hydrochloric acid, usually in a volume ratio of 1:3. It was named so because it can dissolve the so-called royal or noble metals, gold and platinum. However, titanium, iridium, ruthenium, tantalum, osmium, rhodium and a few other metals are capable of withstanding its corrosive properties.
[15] Water can be separated from alcohol water mixture by –
A.
decantation
B.
evaporation
C.
distillation
D.
sublimation
Ans:
distillation
Explanation :
Distillation is a method of separating mixtures based on differences in volatilities of components in a boiling liquid mixture. Distillation is a unit operation, or a physical separation process, and not a chemical reaction. Commercially, distillation has a number of applications. It is used to separate crude oil into more fractions for specific uses such as transport, power generation and heating. Water is distilled to remove impurities, such as salt from seawater. Air is distilled to separate its components— notably oxygen, nitrogen, and argon— for industrial use.
[16] 'Milk Sugar' is –
A.
Lactose
B.
Maltose
C.
Galactose
D.
Sucrose
Ans:
Lactose
Explanation :
Lactose is a disaccharide. It is a sugar composed of galactose and glucose subunits and has the molecular formula C₁₂H₂₂O₁₁. Lactose makes up around 2–8% of milk. The name comes from lac, the Latin word for milk, plus the suffix -ose used to name sugars.
[17] Which of the following is not a nitrogenous fertilizer?
A.
Ammonium sulphate
B.
Urea
C.
Ammonium nitrate
D.
Superphosphate
Ans:
Superphosphate
Explanation :
Superphosphate is a common synthetic phosphorus fertilizer. It contains phosphorus and sulphur in a ratio of 1 to 1.22. It is produced by treatment of “phosphate rock” with acids such as sulphuric acid. Superphosphate is the principal carrier of phosphate, the form of phosphorus usable by plants, and is one of the world’s most important fertilizers.
[18] Which of the following is chief source of Naphthalene?
A.
Moth balls
B.
Moth flakes
C.
Tar Camphor
D.
Coal-tar
Ans:
Tar Camphor
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).
[19] Which of the following is the petroleum wax?
A.
Bees wax
B.
Carnauba wax
C.
Paraffin wax
D.
Jojoba wax
Ans:
Paraffin wax
Explanation :
Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 °C (113 °F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Although most natural waxes are esters, paraffin waxes are hydrocarbons, Paraffin waxes are mixtures of saturated and iso-alkanes, naphthenes, and alkyl- and naphthene-substituted aromatic compounds.
[20] Which variety of coal contains recognizable traces of the original plant material?
A.
Anthracite
B.
Lignite
C.
Peat
D.
Bitumen
Ans:
Peat
Explanation :
Peat contains recognizable traces of the original plant material. Initially the peat is converted into lignite or 'brown coal' - these are coal-types with low organic maturity. In comparison to other coals, lignite is quite soft and its colour can range from dark black to various shades of brown.
[21] Sodium calcium silicate is called .
A.
Hard glass
B.
Borosilicate glass
C.
Soft glass
D.
Jena glass
Ans:
Soft glass
Explanation :
Ordinary glass which is also known as soda glass or soft glass is a mixture of sodium silicate, Calcium silicate, and Silica.
[22] A gas used as a disinfectant in drinking water is -
A.
Hydrogen
B.
Oxygen
C.
Fluorine
D.
Chlorine
Ans:
Chlorine
Explanation :
Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water.
[23] Who developed atom bomb?
A.
Warn& Wan Brown
B.
J. Robert Openheimer
C.
Edward Taylor
D.
Samuel Koehen
Ans:
J. Robert Openheimer
Explanation :
J. (Julius) Robert Oppenheimer was born in New York City on April 22, 1904. Under Oppenheimer's guidance, the laboratories at Los Alamos were constructed. There, he brought the best minds in physics to work on the problem of creating an atomic bomb. In the end, he was managing; more than 3,000 people, as well as tackling theoretical and mechanical problems that arose. He is often referred to as the "father" of the atomic bomb.
[24] The major harmful gas emitted by automobile vehicle which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood’s ability to carry oxygen; overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[25] Humburger effect is otherwise known as-
A.
Sodium pump
B.
Anaerobic metabolism
C.
Choloride shift
D.
Respiratory product
Ans:
Choloride shift
Explanation :
Hamburger shift (also known as the Chloride shift) is a process which occurs in the cardiovascular system and refers to the exchange of bicarbonate (HCO3-) and chloride (Cl-) across the membrane of red blood cells.
Explanation :
A fossil fuel, coal forms when dead plant matter is converted into peat, which in turn is converted into lignite, then sub-bituminous coal, after that bituminous coal, and lastly anthracite: This involves biological and geological processes that take place over a long period.
[6] An example of semiconductor is -
A.
German silver
B.
Germanium
C.
Phosphorous
D.
Arsenic
Ans:
Germanium
Explanation :
Purified germanium is a semiconductor, with appearance most similar to elemental silicon. Like silicon, germanium naturally reacts and forms complexes with oxygen in nature. Unlike silicon, it is too reactive to be found naturally on Earth in the free (native) state.
[7] Non-stick kitchenwares are coated with –
A.
PVC
B.
Graphite
C.
Teflon
D.
Silicon
Ans:
Teflon
Explanation :
Polytetrafluoroethylene (FYIFE) is a synthetic fluoropolymer of tetrafluoroethylene that finds numerous applications. The best known brand name of FIFE is Teflon. PTFE is used as a non-stick coating for pans and other cookware as it is hydrophobic and possesses fairly high heat resistance.
[8] 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.
[9] ‘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.
[10] The material used in the manufacture of lead pencil is –
A.
Graphite
B.
Lead
C.
Carbon
D.
Mica
Ans:
Graphite
Explanation :
Pencils create marks via physical abrasion, leaving behind a trail of solid core material that adheres to a sheet of paper or other surface. They are noticeably distinct from pens, which dispense liquid or gel ink that stain the light colour of the paper. Most pencil cores are made of graphite mixed with a clay binder, leaving grey or black marks that can be easily erased.
[11] If all bullets could not be removed from gunshot injury of a man, it may cause poisoning by –
A.
Mercury
B.
Lead
C.
Iron
D.
Arsenic
Ans:
Lead
Explanation :
Lead is used in building construction, lead-acid batteries, bullets and shot, weights, as part of soldiers, pewters, fusible alloys, and as a radiation shield. Lead has the highest atomic number of all of the stable elements, although the next higher element, bismuth, has a half-life that is so long (much longer than the age of the universe) that it can be considered stable. Its four stable isotopes have 82 protons, a magic number in the nuclear shell model of atomic nuclei.
[12] Nail polish remover contains?
A.
Benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
acetone
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
[13] Which of the following metals is NOT obtained by reduction using carbon?
A.
Copper
B.
Sodium
C.
Iron
D.
Zinc
Ans:
Sodium
Explanation :
Metals such as zinc, iron and copper are present in ores as their oxides. Each of these oxides is heated with carbon to obtain the metal.
[14] One of the following is used to dissolve noble metals. That is –
A.
Nitric acid
B.
Hydrochloric acid
C.
Sulphuric acid
D.
Aqua ragia
Ans:
Aqua ragia
Explanation :
Aqua regia ("royal water"), aqua aegis ("king's water"), or nitro-hydrochloric acid is a highly corrosive mixture of acids, a fuming yellow or red solution. The mixture is formed by freshly mixing concentrated nitric acid and hydrochloric acid, usually in a volume ratio of 1:3. It was named so because it can dissolve the so-called royal or noble metals, gold and platinum. However, titanium, iridium, ruthenium, tantalum, osmium, rhodium and a few other metals are capable of withstanding its corrosive properties.
[15] Water can be separated from alcohol water mixture by –
A.
decantation
B.
evaporation
C.
distillation
D.
sublimation
Ans:
distillation
Explanation :
Distillation is a method of separating mixtures based on differences in volatilities of components in a boiling liquid mixture. Distillation is a unit operation, or a physical separation process, and not a chemical reaction. Commercially, distillation has a number of applications. It is used to separate crude oil into more fractions for specific uses such as transport, power generation and heating. Water is distilled to remove impurities, such as salt from seawater. Air is distilled to separate its components— notably oxygen, nitrogen, and argon— for industrial use.
[16] 'Milk Sugar' is –
A.
Lactose
B.
Maltose
C.
Galactose
D.
Sucrose
Ans:
Lactose
Explanation :
Lactose is a disaccharide. It is a sugar composed of galactose and glucose subunits and has the molecular formula C₁₂H₂₂O₁₁. Lactose makes up around 2–8% of milk. The name comes from lac, the Latin word for milk, plus the suffix -ose used to name sugars.
[17] Which of the following is not a nitrogenous fertilizer?
A.
Ammonium sulphate
B.
Urea
C.
Ammonium nitrate
D.
Superphosphate
Ans:
Superphosphate
Explanation :
Superphosphate is a common synthetic phosphorus fertilizer. It contains phosphorus and sulphur in a ratio of 1 to 1.22. It is produced by treatment of “phosphate rock” with acids such as sulphuric acid. Superphosphate is the principal carrier of phosphate, the form of phosphorus usable by plants, and is one of the world’s most important fertilizers.
[18] Which of the following is chief source of Naphthalene?
A.
Moth balls
B.
Moth flakes
C.
Tar Camphor
D.
Coal-tar
Ans:
Tar Camphor
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).
[19] Which of the following is the petroleum wax?
A.
Bees wax
B.
Carnauba wax
C.
Paraffin wax
D.
Jojoba wax
Ans:
Paraffin wax
Explanation :
Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 °C (113 °F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Although most natural waxes are esters, paraffin waxes are hydrocarbons, Paraffin waxes are mixtures of saturated and iso-alkanes, naphthenes, and alkyl- and naphthene-substituted aromatic compounds.
[20] Which variety of coal contains recognizable traces of the original plant material?
A.
Anthracite
B.
Lignite
C.
Peat
D.
Bitumen
Ans:
Peat
Explanation :
Peat contains recognizable traces of the original plant material. Initially the peat is converted into lignite or 'brown coal' - these are coal-types with low organic maturity. In comparison to other coals, lignite is quite soft and its colour can range from dark black to various shades of brown.
[21] Sodium calcium silicate is called .
A.
Hard glass
B.
Borosilicate glass
C.
Soft glass
D.
Jena glass
Ans:
Soft glass
Explanation :
Ordinary glass which is also known as soda glass or soft glass is a mixture of sodium silicate, Calcium silicate, and Silica.
[22] A gas used as a disinfectant in drinking water is -
A.
Hydrogen
B.
Oxygen
C.
Fluorine
D.
Chlorine
Ans:
Chlorine
Explanation :
Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water.
[23] Who developed atom bomb?
A.
Warn& Wan Brown
B.
J. Robert Openheimer
C.
Edward Taylor
D.
Samuel Koehen
Ans:
J. Robert Openheimer
Explanation :
J. (Julius) Robert Oppenheimer was born in New York City on April 22, 1904. Under Oppenheimer's guidance, the laboratories at Los Alamos were constructed. There, he brought the best minds in physics to work on the problem of creating an atomic bomb. In the end, he was managing; more than 3,000 people, as well as tackling theoretical and mechanical problems that arose. He is often referred to as the "father" of the atomic bomb.
[24] The major harmful gas emitted by automobile vehicle which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood’s ability to carry oxygen; overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[25] Humburger effect is otherwise known as-
A.
Sodium pump
B.
Anaerobic metabolism
C.
Choloride shift
D.
Respiratory product
Ans:
Choloride shift
Explanation :
Hamburger shift (also known as the Chloride shift) is a process which occurs in the cardiovascular system and refers to the exchange of bicarbonate (HCO3-) and chloride (Cl-) across the membrane of red blood cells.
Explanation :
Polytetrafluoroethylene (FYIFE) is a synthetic fluoropolymer of tetrafluoroethylene that finds numerous applications. The best known brand name of FIFE is Teflon. PTFE is used as a non-stick coating for pans and other cookware as it is hydrophobic and possesses fairly high heat resistance.
[8] 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.
[9] ‘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.
[10] The material used in the manufacture of lead pencil is –
A.
Graphite
B.
Lead
C.
Carbon
D.
Mica
Ans:
Graphite
Explanation :
Pencils create marks via physical abrasion, leaving behind a trail of solid core material that adheres to a sheet of paper or other surface. They are noticeably distinct from pens, which dispense liquid or gel ink that stain the light colour of the paper. Most pencil cores are made of graphite mixed with a clay binder, leaving grey or black marks that can be easily erased.
[11] If all bullets could not be removed from gunshot injury of a man, it may cause poisoning by –
A.
Mercury
B.
Lead
C.
Iron
D.
Arsenic
Ans:
Lead
Explanation :
Lead is used in building construction, lead-acid batteries, bullets and shot, weights, as part of soldiers, pewters, fusible alloys, and as a radiation shield. Lead has the highest atomic number of all of the stable elements, although the next higher element, bismuth, has a half-life that is so long (much longer than the age of the universe) that it can be considered stable. Its four stable isotopes have 82 protons, a magic number in the nuclear shell model of atomic nuclei.
[12] Nail polish remover contains?
A.
Benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
acetone
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
[13] Which of the following metals is NOT obtained by reduction using carbon?
A.
Copper
B.
Sodium
C.
Iron
D.
Zinc
Ans:
Sodium
Explanation :
Metals such as zinc, iron and copper are present in ores as their oxides. Each of these oxides is heated with carbon to obtain the metal.
[14] One of the following is used to dissolve noble metals. That is –
A.
Nitric acid
B.
Hydrochloric acid
C.
Sulphuric acid
D.
Aqua ragia
Ans:
Aqua ragia
Explanation :
Aqua regia ("royal water"), aqua aegis ("king's water"), or nitro-hydrochloric acid is a highly corrosive mixture of acids, a fuming yellow or red solution. The mixture is formed by freshly mixing concentrated nitric acid and hydrochloric acid, usually in a volume ratio of 1:3. It was named so because it can dissolve the so-called royal or noble metals, gold and platinum. However, titanium, iridium, ruthenium, tantalum, osmium, rhodium and a few other metals are capable of withstanding its corrosive properties.
[15] Water can be separated from alcohol water mixture by –
A.
decantation
B.
evaporation
C.
distillation
D.
sublimation
Ans:
distillation
Explanation :
Distillation is a method of separating mixtures based on differences in volatilities of components in a boiling liquid mixture. Distillation is a unit operation, or a physical separation process, and not a chemical reaction. Commercially, distillation has a number of applications. It is used to separate crude oil into more fractions for specific uses such as transport, power generation and heating. Water is distilled to remove impurities, such as salt from seawater. Air is distilled to separate its components— notably oxygen, nitrogen, and argon— for industrial use.
[16] 'Milk Sugar' is –
A.
Lactose
B.
Maltose
C.
Galactose
D.
Sucrose
Ans:
Lactose
Explanation :
Lactose is a disaccharide. It is a sugar composed of galactose and glucose subunits and has the molecular formula C₁₂H₂₂O₁₁. Lactose makes up around 2–8% of milk. The name comes from lac, the Latin word for milk, plus the suffix -ose used to name sugars.
[17] Which of the following is not a nitrogenous fertilizer?
A.
Ammonium sulphate
B.
Urea
C.
Ammonium nitrate
D.
Superphosphate
Ans:
Superphosphate
Explanation :
Superphosphate is a common synthetic phosphorus fertilizer. It contains phosphorus and sulphur in a ratio of 1 to 1.22. It is produced by treatment of “phosphate rock” with acids such as sulphuric acid. Superphosphate is the principal carrier of phosphate, the form of phosphorus usable by plants, and is one of the world’s most important fertilizers.
[18] Which of the following is chief source of Naphthalene?
A.
Moth balls
B.
Moth flakes
C.
Tar Camphor
D.
Coal-tar
Ans:
Tar Camphor
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).
[19] Which of the following is the petroleum wax?
A.
Bees wax
B.
Carnauba wax
C.
Paraffin wax
D.
Jojoba wax
Ans:
Paraffin wax
Explanation :
Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 °C (113 °F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Although most natural waxes are esters, paraffin waxes are hydrocarbons, Paraffin waxes are mixtures of saturated and iso-alkanes, naphthenes, and alkyl- and naphthene-substituted aromatic compounds.
[20] Which variety of coal contains recognizable traces of the original plant material?
A.
Anthracite
B.
Lignite
C.
Peat
D.
Bitumen
Ans:
Peat
Explanation :
Peat contains recognizable traces of the original plant material. Initially the peat is converted into lignite or 'brown coal' - these are coal-types with low organic maturity. In comparison to other coals, lignite is quite soft and its colour can range from dark black to various shades of brown.
[21] Sodium calcium silicate is called .
A.
Hard glass
B.
Borosilicate glass
C.
Soft glass
D.
Jena glass
Ans:
Soft glass
Explanation :
Ordinary glass which is also known as soda glass or soft glass is a mixture of sodium silicate, Calcium silicate, and Silica.
[22] A gas used as a disinfectant in drinking water is -
A.
Hydrogen
B.
Oxygen
C.
Fluorine
D.
Chlorine
Ans:
Chlorine
Explanation :
Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water.
[23] Who developed atom bomb?
A.
Warn& Wan Brown
B.
J. Robert Openheimer
C.
Edward Taylor
D.
Samuel Koehen
Ans:
J. Robert Openheimer
Explanation :
J. (Julius) Robert Oppenheimer was born in New York City on April 22, 1904. Under Oppenheimer's guidance, the laboratories at Los Alamos were constructed. There, he brought the best minds in physics to work on the problem of creating an atomic bomb. In the end, he was managing; more than 3,000 people, as well as tackling theoretical and mechanical problems that arose. He is often referred to as the "father" of the atomic bomb.
[24] The major harmful gas emitted by automobile vehicle which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood’s ability to carry oxygen; overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[25] Humburger effect is otherwise known as-
A.
Sodium pump
B.
Anaerobic metabolism
C.
Choloride shift
D.
Respiratory product
Ans:
Choloride shift
Explanation :
Hamburger shift (also known as the Chloride shift) is a process which occurs in the cardiovascular system and refers to the exchange of bicarbonate (HCO3-) and chloride (Cl-) across the membrane of red blood cells.
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.
[10] The material used in the manufacture of lead pencil is –
A.
Graphite
B.
Lead
C.
Carbon
D.
Mica
Ans:
Graphite
Explanation :
Pencils create marks via physical abrasion, leaving behind a trail of solid core material that adheres to a sheet of paper or other surface. They are noticeably distinct from pens, which dispense liquid or gel ink that stain the light colour of the paper. Most pencil cores are made of graphite mixed with a clay binder, leaving grey or black marks that can be easily erased.
[11] If all bullets could not be removed from gunshot injury of a man, it may cause poisoning by –
A.
Mercury
B.
Lead
C.
Iron
D.
Arsenic
Ans:
Lead
Explanation :
Lead is used in building construction, lead-acid batteries, bullets and shot, weights, as part of soldiers, pewters, fusible alloys, and as a radiation shield. Lead has the highest atomic number of all of the stable elements, although the next higher element, bismuth, has a half-life that is so long (much longer than the age of the universe) that it can be considered stable. Its four stable isotopes have 82 protons, a magic number in the nuclear shell model of atomic nuclei.
[12] Nail polish remover contains?
A.
Benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
acetone
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
[13] Which of the following metals is NOT obtained by reduction using carbon?
A.
Copper
B.
Sodium
C.
Iron
D.
Zinc
Ans:
Sodium
Explanation :
Metals such as zinc, iron and copper are present in ores as their oxides. Each of these oxides is heated with carbon to obtain the metal.
[14] One of the following is used to dissolve noble metals. That is –
A.
Nitric acid
B.
Hydrochloric acid
C.
Sulphuric acid
D.
Aqua ragia
Ans:
Aqua ragia
Explanation :
Aqua regia ("royal water"), aqua aegis ("king's water"), or nitro-hydrochloric acid is a highly corrosive mixture of acids, a fuming yellow or red solution. The mixture is formed by freshly mixing concentrated nitric acid and hydrochloric acid, usually in a volume ratio of 1:3. It was named so because it can dissolve the so-called royal or noble metals, gold and platinum. However, titanium, iridium, ruthenium, tantalum, osmium, rhodium and a few other metals are capable of withstanding its corrosive properties.
[15] Water can be separated from alcohol water mixture by –
A.
decantation
B.
evaporation
C.
distillation
D.
sublimation
Ans:
distillation
Explanation :
Distillation is a method of separating mixtures based on differences in volatilities of components in a boiling liquid mixture. Distillation is a unit operation, or a physical separation process, and not a chemical reaction. Commercially, distillation has a number of applications. It is used to separate crude oil into more fractions for specific uses such as transport, power generation and heating. Water is distilled to remove impurities, such as salt from seawater. Air is distilled to separate its components— notably oxygen, nitrogen, and argon— for industrial use.
[16] 'Milk Sugar' is –
A.
Lactose
B.
Maltose
C.
Galactose
D.
Sucrose
Ans:
Lactose
Explanation :
Lactose is a disaccharide. It is a sugar composed of galactose and glucose subunits and has the molecular formula C₁₂H₂₂O₁₁. Lactose makes up around 2–8% of milk. The name comes from lac, the Latin word for milk, plus the suffix -ose used to name sugars.
[17] Which of the following is not a nitrogenous fertilizer?
A.
Ammonium sulphate
B.
Urea
C.
Ammonium nitrate
D.
Superphosphate
Ans:
Superphosphate
Explanation :
Superphosphate is a common synthetic phosphorus fertilizer. It contains phosphorus and sulphur in a ratio of 1 to 1.22. It is produced by treatment of “phosphate rock” with acids such as sulphuric acid. Superphosphate is the principal carrier of phosphate, the form of phosphorus usable by plants, and is one of the world’s most important fertilizers.
[18] Which of the following is chief source of Naphthalene?
A.
Moth balls
B.
Moth flakes
C.
Tar Camphor
D.
Coal-tar
Ans:
Tar Camphor
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).
[19] Which of the following is the petroleum wax?
A.
Bees wax
B.
Carnauba wax
C.
Paraffin wax
D.
Jojoba wax
Ans:
Paraffin wax
Explanation :
Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 °C (113 °F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Although most natural waxes are esters, paraffin waxes are hydrocarbons, Paraffin waxes are mixtures of saturated and iso-alkanes, naphthenes, and alkyl- and naphthene-substituted aromatic compounds.
[20] Which variety of coal contains recognizable traces of the original plant material?
A.
Anthracite
B.
Lignite
C.
Peat
D.
Bitumen
Ans:
Peat
Explanation :
Peat contains recognizable traces of the original plant material. Initially the peat is converted into lignite or 'brown coal' - these are coal-types with low organic maturity. In comparison to other coals, lignite is quite soft and its colour can range from dark black to various shades of brown.
[21] Sodium calcium silicate is called .
A.
Hard glass
B.
Borosilicate glass
C.
Soft glass
D.
Jena glass
Ans:
Soft glass
Explanation :
Ordinary glass which is also known as soda glass or soft glass is a mixture of sodium silicate, Calcium silicate, and Silica.
[22] A gas used as a disinfectant in drinking water is -
A.
Hydrogen
B.
Oxygen
C.
Fluorine
D.
Chlorine
Ans:
Chlorine
Explanation :
Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water.
[23] Who developed atom bomb?
A.
Warn& Wan Brown
B.
J. Robert Openheimer
C.
Edward Taylor
D.
Samuel Koehen
Ans:
J. Robert Openheimer
Explanation :
J. (Julius) Robert Oppenheimer was born in New York City on April 22, 1904. Under Oppenheimer's guidance, the laboratories at Los Alamos were constructed. There, he brought the best minds in physics to work on the problem of creating an atomic bomb. In the end, he was managing; more than 3,000 people, as well as tackling theoretical and mechanical problems that arose. He is often referred to as the "father" of the atomic bomb.
[24] The major harmful gas emitted by automobile vehicle which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood’s ability to carry oxygen; overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[25] Humburger effect is otherwise known as-
A.
Sodium pump
B.
Anaerobic metabolism
C.
Choloride shift
D.
Respiratory product
Ans:
Choloride shift
Explanation :
Hamburger shift (also known as the Chloride shift) is a process which occurs in the cardiovascular system and refers to the exchange of bicarbonate (HCO3-) and chloride (Cl-) across the membrane of red blood cells.
Explanation :
Lead is used in building construction, lead-acid batteries, bullets and shot, weights, as part of soldiers, pewters, fusible alloys, and as a radiation shield. Lead has the highest atomic number of all of the stable elements, although the next higher element, bismuth, has a half-life that is so long (much longer than the age of the universe) that it can be considered stable. Its four stable isotopes have 82 protons, a magic number in the nuclear shell model of atomic nuclei.
[12] Nail polish remover contains?
A.
Benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
acetone
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
[13] Which of the following metals is NOT obtained by reduction using carbon?
A.
Copper
B.
Sodium
C.
Iron
D.
Zinc
Ans:
Sodium
Explanation :
Metals such as zinc, iron and copper are present in ores as their oxides. Each of these oxides is heated with carbon to obtain the metal.
[14] One of the following is used to dissolve noble metals. That is –
A.
Nitric acid
B.
Hydrochloric acid
C.
Sulphuric acid
D.
Aqua ragia
Ans:
Aqua ragia
Explanation :
Aqua regia ("royal water"), aqua aegis ("king's water"), or nitro-hydrochloric acid is a highly corrosive mixture of acids, a fuming yellow or red solution. The mixture is formed by freshly mixing concentrated nitric acid and hydrochloric acid, usually in a volume ratio of 1:3. It was named so because it can dissolve the so-called royal or noble metals, gold and platinum. However, titanium, iridium, ruthenium, tantalum, osmium, rhodium and a few other metals are capable of withstanding its corrosive properties.
[15] Water can be separated from alcohol water mixture by –
A.
decantation
B.
evaporation
C.
distillation
D.
sublimation
Ans:
distillation
Explanation :
Distillation is a method of separating mixtures based on differences in volatilities of components in a boiling liquid mixture. Distillation is a unit operation, or a physical separation process, and not a chemical reaction. Commercially, distillation has a number of applications. It is used to separate crude oil into more fractions for specific uses such as transport, power generation and heating. Water is distilled to remove impurities, such as salt from seawater. Air is distilled to separate its components— notably oxygen, nitrogen, and argon— for industrial use.
[16] 'Milk Sugar' is –
A.
Lactose
B.
Maltose
C.
Galactose
D.
Sucrose
Ans:
Lactose
Explanation :
Lactose is a disaccharide. It is a sugar composed of galactose and glucose subunits and has the molecular formula C₁₂H₂₂O₁₁. Lactose makes up around 2–8% of milk. The name comes from lac, the Latin word for milk, plus the suffix -ose used to name sugars.
[17] Which of the following is not a nitrogenous fertilizer?
A.
Ammonium sulphate
B.
Urea
C.
Ammonium nitrate
D.
Superphosphate
Ans:
Superphosphate
Explanation :
Superphosphate is a common synthetic phosphorus fertilizer. It contains phosphorus and sulphur in a ratio of 1 to 1.22. It is produced by treatment of “phosphate rock” with acids such as sulphuric acid. Superphosphate is the principal carrier of phosphate, the form of phosphorus usable by plants, and is one of the world’s most important fertilizers.
[18] Which of the following is chief source of Naphthalene?
A.
Moth balls
B.
Moth flakes
C.
Tar Camphor
D.
Coal-tar
Ans:
Tar Camphor
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).
[19] Which of the following is the petroleum wax?
A.
Bees wax
B.
Carnauba wax
C.
Paraffin wax
D.
Jojoba wax
Ans:
Paraffin wax
Explanation :
Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 °C (113 °F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Although most natural waxes are esters, paraffin waxes are hydrocarbons, Paraffin waxes are mixtures of saturated and iso-alkanes, naphthenes, and alkyl- and naphthene-substituted aromatic compounds.
[20] Which variety of coal contains recognizable traces of the original plant material?
A.
Anthracite
B.
Lignite
C.
Peat
D.
Bitumen
Ans:
Peat
Explanation :
Peat contains recognizable traces of the original plant material. Initially the peat is converted into lignite or 'brown coal' - these are coal-types with low organic maturity. In comparison to other coals, lignite is quite soft and its colour can range from dark black to various shades of brown.
[21] Sodium calcium silicate is called .
A.
Hard glass
B.
Borosilicate glass
C.
Soft glass
D.
Jena glass
Ans:
Soft glass
Explanation :
Ordinary glass which is also known as soda glass or soft glass is a mixture of sodium silicate, Calcium silicate, and Silica.
[22] A gas used as a disinfectant in drinking water is -
A.
Hydrogen
B.
Oxygen
C.
Fluorine
D.
Chlorine
Ans:
Chlorine
Explanation :
Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water.
[23] Who developed atom bomb?
A.
Warn& Wan Brown
B.
J. Robert Openheimer
C.
Edward Taylor
D.
Samuel Koehen
Ans:
J. Robert Openheimer
Explanation :
J. (Julius) Robert Oppenheimer was born in New York City on April 22, 1904. Under Oppenheimer's guidance, the laboratories at Los Alamos were constructed. There, he brought the best minds in physics to work on the problem of creating an atomic bomb. In the end, he was managing; more than 3,000 people, as well as tackling theoretical and mechanical problems that arose. He is often referred to as the "father" of the atomic bomb.
[24] The major harmful gas emitted by automobile vehicle which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood’s ability to carry oxygen; overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[25] Humburger effect is otherwise known as-
A.
Sodium pump
B.
Anaerobic metabolism
C.
Choloride shift
D.
Respiratory product
Ans:
Choloride shift
Explanation :
Hamburger shift (also known as the Chloride shift) is a process which occurs in the cardiovascular system and refers to the exchange of bicarbonate (HCO3-) and chloride (Cl-) across the membrane of red blood cells.
Explanation :
Metals such as zinc, iron and copper are present in ores as their oxides. Each of these oxides is heated with carbon to obtain the metal.
[14] One of the following is used to dissolve noble metals. That is –
A.
Nitric acid
B.
Hydrochloric acid
C.
Sulphuric acid
D.
Aqua ragia
Ans:
Aqua ragia
Explanation :
Aqua regia ("royal water"), aqua aegis ("king's water"), or nitro-hydrochloric acid is a highly corrosive mixture of acids, a fuming yellow or red solution. The mixture is formed by freshly mixing concentrated nitric acid and hydrochloric acid, usually in a volume ratio of 1:3. It was named so because it can dissolve the so-called royal or noble metals, gold and platinum. However, titanium, iridium, ruthenium, tantalum, osmium, rhodium and a few other metals are capable of withstanding its corrosive properties.
[15] Water can be separated from alcohol water mixture by –
A.
decantation
B.
evaporation
C.
distillation
D.
sublimation
Ans:
distillation
Explanation :
Distillation is a method of separating mixtures based on differences in volatilities of components in a boiling liquid mixture. Distillation is a unit operation, or a physical separation process, and not a chemical reaction. Commercially, distillation has a number of applications. It is used to separate crude oil into more fractions for specific uses such as transport, power generation and heating. Water is distilled to remove impurities, such as salt from seawater. Air is distilled to separate its components— notably oxygen, nitrogen, and argon— for industrial use.
[16] 'Milk Sugar' is –
A.
Lactose
B.
Maltose
C.
Galactose
D.
Sucrose
Ans:
Lactose
Explanation :
Lactose is a disaccharide. It is a sugar composed of galactose and glucose subunits and has the molecular formula C₁₂H₂₂O₁₁. Lactose makes up around 2–8% of milk. The name comes from lac, the Latin word for milk, plus the suffix -ose used to name sugars.
[17] Which of the following is not a nitrogenous fertilizer?
A.
Ammonium sulphate
B.
Urea
C.
Ammonium nitrate
D.
Superphosphate
Ans:
Superphosphate
Explanation :
Superphosphate is a common synthetic phosphorus fertilizer. It contains phosphorus and sulphur in a ratio of 1 to 1.22. It is produced by treatment of “phosphate rock” with acids such as sulphuric acid. Superphosphate is the principal carrier of phosphate, the form of phosphorus usable by plants, and is one of the world’s most important fertilizers.
[18] Which of the following is chief source of Naphthalene?
A.
Moth balls
B.
Moth flakes
C.
Tar Camphor
D.
Coal-tar
Ans:
Tar Camphor
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).
[19] Which of the following is the petroleum wax?
A.
Bees wax
B.
Carnauba wax
C.
Paraffin wax
D.
Jojoba wax
Ans:
Paraffin wax
Explanation :
Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 °C (113 °F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Although most natural waxes are esters, paraffin waxes are hydrocarbons, Paraffin waxes are mixtures of saturated and iso-alkanes, naphthenes, and alkyl- and naphthene-substituted aromatic compounds.
[20] Which variety of coal contains recognizable traces of the original plant material?
A.
Anthracite
B.
Lignite
C.
Peat
D.
Bitumen
Ans:
Peat
Explanation :
Peat contains recognizable traces of the original plant material. Initially the peat is converted into lignite or 'brown coal' - these are coal-types with low organic maturity. In comparison to other coals, lignite is quite soft and its colour can range from dark black to various shades of brown.
[21] Sodium calcium silicate is called .
A.
Hard glass
B.
Borosilicate glass
C.
Soft glass
D.
Jena glass
Ans:
Soft glass
Explanation :
Ordinary glass which is also known as soda glass or soft glass is a mixture of sodium silicate, Calcium silicate, and Silica.
[22] A gas used as a disinfectant in drinking water is -
A.
Hydrogen
B.
Oxygen
C.
Fluorine
D.
Chlorine
Ans:
Chlorine
Explanation :
Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water.
[23] Who developed atom bomb?
A.
Warn& Wan Brown
B.
J. Robert Openheimer
C.
Edward Taylor
D.
Samuel Koehen
Ans:
J. Robert Openheimer
Explanation :
J. (Julius) Robert Oppenheimer was born in New York City on April 22, 1904. Under Oppenheimer's guidance, the laboratories at Los Alamos were constructed. There, he brought the best minds in physics to work on the problem of creating an atomic bomb. In the end, he was managing; more than 3,000 people, as well as tackling theoretical and mechanical problems that arose. He is often referred to as the "father" of the atomic bomb.
[24] The major harmful gas emitted by automobile vehicle which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood’s ability to carry oxygen; overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[25] Humburger effect is otherwise known as-
A.
Sodium pump
B.
Anaerobic metabolism
C.
Choloride shift
D.
Respiratory product
Ans:
Choloride shift
Explanation :
Hamburger shift (also known as the Chloride shift) is a process which occurs in the cardiovascular system and refers to the exchange of bicarbonate (HCO3-) and chloride (Cl-) across the membrane of red blood cells.
Explanation :
Distillation is a method of separating mixtures based on differences in volatilities of components in a boiling liquid mixture. Distillation is a unit operation, or a physical separation process, and not a chemical reaction. Commercially, distillation has a number of applications. It is used to separate crude oil into more fractions for specific uses such as transport, power generation and heating. Water is distilled to remove impurities, such as salt from seawater. Air is distilled to separate its components— notably oxygen, nitrogen, and argon— for industrial use.
[16] 'Milk Sugar' is –
A.
Lactose
B.
Maltose
C.
Galactose
D.
Sucrose
Ans:
Lactose
Explanation :
Lactose is a disaccharide. It is a sugar composed of galactose and glucose subunits and has the molecular formula C₁₂H₂₂O₁₁. Lactose makes up around 2–8% of milk. The name comes from lac, the Latin word for milk, plus the suffix -ose used to name sugars.
[17] Which of the following is not a nitrogenous fertilizer?
A.
Ammonium sulphate
B.
Urea
C.
Ammonium nitrate
D.
Superphosphate
Ans:
Superphosphate
Explanation :
Superphosphate is a common synthetic phosphorus fertilizer. It contains phosphorus and sulphur in a ratio of 1 to 1.22. It is produced by treatment of “phosphate rock” with acids such as sulphuric acid. Superphosphate is the principal carrier of phosphate, the form of phosphorus usable by plants, and is one of the world’s most important fertilizers.
[18] Which of the following is chief source of Naphthalene?
A.
Moth balls
B.
Moth flakes
C.
Tar Camphor
D.
Coal-tar
Ans:
Tar Camphor
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).
[19] Which of the following is the petroleum wax?
A.
Bees wax
B.
Carnauba wax
C.
Paraffin wax
D.
Jojoba wax
Ans:
Paraffin wax
Explanation :
Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 °C (113 °F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Although most natural waxes are esters, paraffin waxes are hydrocarbons, Paraffin waxes are mixtures of saturated and iso-alkanes, naphthenes, and alkyl- and naphthene-substituted aromatic compounds.
[20] Which variety of coal contains recognizable traces of the original plant material?
A.
Anthracite
B.
Lignite
C.
Peat
D.
Bitumen
Ans:
Peat
Explanation :
Peat contains recognizable traces of the original plant material. Initially the peat is converted into lignite or 'brown coal' - these are coal-types with low organic maturity. In comparison to other coals, lignite is quite soft and its colour can range from dark black to various shades of brown.
[21] Sodium calcium silicate is called .
A.
Hard glass
B.
Borosilicate glass
C.
Soft glass
D.
Jena glass
Ans:
Soft glass
Explanation :
Ordinary glass which is also known as soda glass or soft glass is a mixture of sodium silicate, Calcium silicate, and Silica.
[22] A gas used as a disinfectant in drinking water is -
A.
Hydrogen
B.
Oxygen
C.
Fluorine
D.
Chlorine
Ans:
Chlorine
Explanation :
Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water.
[23] Who developed atom bomb?
A.
Warn& Wan Brown
B.
J. Robert Openheimer
C.
Edward Taylor
D.
Samuel Koehen
Ans:
J. Robert Openheimer
Explanation :
J. (Julius) Robert Oppenheimer was born in New York City on April 22, 1904. Under Oppenheimer's guidance, the laboratories at Los Alamos were constructed. There, he brought the best minds in physics to work on the problem of creating an atomic bomb. In the end, he was managing; more than 3,000 people, as well as tackling theoretical and mechanical problems that arose. He is often referred to as the "father" of the atomic bomb.
[24] The major harmful gas emitted by automobile vehicle which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood’s ability to carry oxygen; overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[25] Humburger effect is otherwise known as-
A.
Sodium pump
B.
Anaerobic metabolism
C.
Choloride shift
D.
Respiratory product
Ans:
Choloride shift
Explanation :
Hamburger shift (also known as the Chloride shift) is a process which occurs in the cardiovascular system and refers to the exchange of bicarbonate (HCO3-) and chloride (Cl-) across the membrane of red blood cells.
Explanation :
Superphosphate is a common synthetic phosphorus fertilizer. It contains phosphorus and sulphur in a ratio of 1 to 1.22. It is produced by treatment of “phosphate rock” with acids such as sulphuric acid. Superphosphate is the principal carrier of phosphate, the form of phosphorus usable by plants, and is one of the world’s most important fertilizers.
[18] Which of the following is chief source of Naphthalene?
A.
Moth balls
B.
Moth flakes
C.
Tar Camphor
D.
Coal-tar
Ans:
Tar Camphor
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).
[19] Which of the following is the petroleum wax?
A.
Bees wax
B.
Carnauba wax
C.
Paraffin wax
D.
Jojoba wax
Ans:
Paraffin wax
Explanation :
Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 °C (113 °F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Although most natural waxes are esters, paraffin waxes are hydrocarbons, Paraffin waxes are mixtures of saturated and iso-alkanes, naphthenes, and alkyl- and naphthene-substituted aromatic compounds.
[20] Which variety of coal contains recognizable traces of the original plant material?
A.
Anthracite
B.
Lignite
C.
Peat
D.
Bitumen
Ans:
Peat
Explanation :
Peat contains recognizable traces of the original plant material. Initially the peat is converted into lignite or 'brown coal' - these are coal-types with low organic maturity. In comparison to other coals, lignite is quite soft and its colour can range from dark black to various shades of brown.
[21] Sodium calcium silicate is called .
A.
Hard glass
B.
Borosilicate glass
C.
Soft glass
D.
Jena glass
Ans:
Soft glass
Explanation :
Ordinary glass which is also known as soda glass or soft glass is a mixture of sodium silicate, Calcium silicate, and Silica.
[22] A gas used as a disinfectant in drinking water is -
A.
Hydrogen
B.
Oxygen
C.
Fluorine
D.
Chlorine
Ans:
Chlorine
Explanation :
Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water.
[23] Who developed atom bomb?
A.
Warn& Wan Brown
B.
J. Robert Openheimer
C.
Edward Taylor
D.
Samuel Koehen
Ans:
J. Robert Openheimer
Explanation :
J. (Julius) Robert Oppenheimer was born in New York City on April 22, 1904. Under Oppenheimer's guidance, the laboratories at Los Alamos were constructed. There, he brought the best minds in physics to work on the problem of creating an atomic bomb. In the end, he was managing; more than 3,000 people, as well as tackling theoretical and mechanical problems that arose. He is often referred to as the "father" of the atomic bomb.
[24] The major harmful gas emitted by automobile vehicle which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood’s ability to carry oxygen; overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[25] Humburger effect is otherwise known as-
A.
Sodium pump
B.
Anaerobic metabolism
C.
Choloride shift
D.
Respiratory product
Ans:
Choloride shift
Explanation :
Hamburger shift (also known as the Chloride shift) is a process which occurs in the cardiovascular system and refers to the exchange of bicarbonate (HCO3-) and chloride (Cl-) across the membrane of red blood cells.
Explanation :
Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 °C (113 °F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Although most natural waxes are esters, paraffin waxes are hydrocarbons, Paraffin waxes are mixtures of saturated and iso-alkanes, naphthenes, and alkyl- and naphthene-substituted aromatic compounds.
[20] Which variety of coal contains recognizable traces of the original plant material?
A.
Anthracite
B.
Lignite
C.
Peat
D.
Bitumen
Ans:
Peat
Explanation :
Peat contains recognizable traces of the original plant material. Initially the peat is converted into lignite or 'brown coal' - these are coal-types with low organic maturity. In comparison to other coals, lignite is quite soft and its colour can range from dark black to various shades of brown.
[21] Sodium calcium silicate is called .
A.
Hard glass
B.
Borosilicate glass
C.
Soft glass
D.
Jena glass
Ans:
Soft glass
Explanation :
Ordinary glass which is also known as soda glass or soft glass is a mixture of sodium silicate, Calcium silicate, and Silica.
[22] A gas used as a disinfectant in drinking water is -
A.
Hydrogen
B.
Oxygen
C.
Fluorine
D.
Chlorine
Ans:
Chlorine
Explanation :
Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water.
[23] Who developed atom bomb?
A.
Warn& Wan Brown
B.
J. Robert Openheimer
C.
Edward Taylor
D.
Samuel Koehen
Ans:
J. Robert Openheimer
Explanation :
J. (Julius) Robert Oppenheimer was born in New York City on April 22, 1904. Under Oppenheimer's guidance, the laboratories at Los Alamos were constructed. There, he brought the best minds in physics to work on the problem of creating an atomic bomb. In the end, he was managing; more than 3,000 people, as well as tackling theoretical and mechanical problems that arose. He is often referred to as the "father" of the atomic bomb.
[24] The major harmful gas emitted by automobile vehicle which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood’s ability to carry oxygen; overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[25] Humburger effect is otherwise known as-
A.
Sodium pump
B.
Anaerobic metabolism
C.
Choloride shift
D.
Respiratory product
Ans:
Choloride shift
Explanation :
Hamburger shift (also known as the Chloride shift) is a process which occurs in the cardiovascular system and refers to the exchange of bicarbonate (HCO3-) and chloride (Cl-) across the membrane of red blood cells.
Explanation :
Ordinary glass which is also known as soda glass or soft glass is a mixture of sodium silicate, Calcium silicate, and Silica.
[22] A gas used as a disinfectant in drinking water is -
A.
Hydrogen
B.
Oxygen
C.
Fluorine
D.
Chlorine
Ans:
Chlorine
Explanation :
Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water.
[23] Who developed atom bomb?
A.
Warn& Wan Brown
B.
J. Robert Openheimer
C.
Edward Taylor
D.
Samuel Koehen
Ans:
J. Robert Openheimer
Explanation :
J. (Julius) Robert Oppenheimer was born in New York City on April 22, 1904. Under Oppenheimer's guidance, the laboratories at Los Alamos were constructed. There, he brought the best minds in physics to work on the problem of creating an atomic bomb. In the end, he was managing; more than 3,000 people, as well as tackling theoretical and mechanical problems that arose. He is often referred to as the "father" of the atomic bomb.
[24] The major harmful gas emitted by automobile vehicle which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood’s ability to carry oxygen; overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[25] Humburger effect is otherwise known as-
A.
Sodium pump
B.
Anaerobic metabolism
C.
Choloride shift
D.
Respiratory product
Ans:
Choloride shift
Explanation :
Hamburger shift (also known as the Chloride shift) is a process which occurs in the cardiovascular system and refers to the exchange of bicarbonate (HCO3-) and chloride (Cl-) across the membrane of red blood cells.
Explanation :
J. (Julius) Robert Oppenheimer was born in New York City on April 22, 1904. Under Oppenheimer's guidance, the laboratories at Los Alamos were constructed. There, he brought the best minds in physics to work on the problem of creating an atomic bomb. In the end, he was managing; more than 3,000 people, as well as tackling theoretical and mechanical problems that arose. He is often referred to as the "father" of the atomic bomb.
[24] The major harmful gas emitted by automobile vehicle which causes air pollution is –
A.
Carbon Monoxide
B.
Methane
C.
Carbon dioxide
D.
Ozone gas
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide is the major harmful gas emitted by the automobile vehicles which causes air pollution. Carbon monoxide (CO) - A product of incomplete combustion, carbon monoxide reduces the blood’s ability to carry oxygen; overexposure (carbon monoxide poisoning) may be fatal. Carbon Monoxide poisoning is a major killer.
[25] Humburger effect is otherwise known as-
A.
Sodium pump
B.
Anaerobic metabolism
C.
Choloride shift
D.
Respiratory product
Ans:
Choloride shift
Explanation :
Hamburger shift (also known as the Chloride shift) is a process which occurs in the cardiovascular system and refers to the exchange of bicarbonate (HCO3-) and chloride (Cl-) across the membrane of red blood cells.
Explanation :
Hamburger shift (also known as the Chloride shift) is a process which occurs in the cardiovascular system and refers to the exchange of bicarbonate (HCO3-) and chloride (Cl-) across the membrane of red blood cells.