[1] Which among the following elements is found in maximum percentage in the human body?
A.
Carbon
B.
Hydrogen
C.
Nitrozen
D.
Oxyzen
Ans:
Oxyzen
Explanation :
Most of the human body is made up of water, H2O, with cells consisting of 65-90% water by weight. Therefore, it isn't surprising that most of a human body's mass is oxygen. Carbon, the basic unit for organic molecules, comes in second. 99% of the mass of the human body is made up of just six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.
[2] Which of the following acids is present in sour milk?
A.
Formic acid
B.
Lactic acid
C.
Citric acid
D.
Tartaric acid
Ans:
Lactic acid
Explanation :
Sour Tasting milk products, like yogurt, butter milk, etc developed sour taste as milk is cultured with lactic acid bacteria.
[3] Non-metallic oxides are in nature.
A.
Basic
B.
Acidic
C.
Neutral
D.
None of the above
Ans:
Acidic
Explanation :
Reaction between a non-metallic oxide and an acid leads to the formation of a salt and water. This is similar to the reaction between a base and an acid; we can conclude that nonmetallic oxides are acidic in nature.
[4] Detergents used for cleaning clothes and utensils contain –
A.
nitrates
B.
bicarbonates
C.
sulphonates
D.
bismuthates
Ans:
sulphonates
Explanation :
Sulphonate is a detergent used for cleaning clothes and utensils. It is a salt or ester of any sulphonic acid.
[5] Radioactive disintegration of uranium ultimately results in formation of –
A.
radium
B.
thorium
C.
polonium
D.
lead
Ans:
lead
Explanation :
Uranium-lead (U-Pb) dating is one of the oldest and most refined of the radiometric dating schemes, with a routine age range of about 1 million years to over 4.5 billion years, and with routine precisions in the 0.1-1 percent range.
[6] Impure camphor is purified by –
A.
sublimation
B.
fractional crystallisation
C.
fractional distillation
D.
steam distillation
Ans:
sublimation
Explanation :
Sublimation apparatus is a piece of laboratory glassware used in the technique of sublimation usually used by chemists to purify compounds. Typically a solid is placed in a vessel which is then heated under vacuum. Under this reduced pressure the solid volatilizes and condenses as a purified compound on a cooled surface, leaving the non-volatile residue impurities behind. This cooled surface often takes the form of a cold finger. Once heating ceases and the vacuum is released, the sublimed compound can be collected from the cooled surface. Impure camphor is purified by this process.
[7] Which among the following stage is suitable indicator when solution of sodium carbonate is mixed with sulphuric acid?
A.
Methylene blue
B.
Methyl red
C.
Phenolphthaline
D.
Methyl orange
Ans:
Methyl orange
Explanation :
Methyl orange is a pH indicator frequently used in titrations. It is often used in titrations because of its clear and distinct colour change. Because it changes colour at the pH of a mid-strength acid, it is usually used in titrations for acids.
[8] In which of the following states maximum iron are is found?
A.
FeCO3
B.
Fe2O3
C.
Fe3O4
D.
FeS2
Ans:
Fe2O3
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The iron itself is usually found in the form of magnetite (Fe3O4), hematite (Fe2O3), goethite (FeO(OH), limonite (FeO(OH).n(H2O)) or siderite (FeCO3). Hematite, also spelled as haematite, is the mineral form of iron(III) oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Huge deposits of hematite are found in banded iron formations. Gray hematite is typically found in places where there has been standing water or mineral hot springs, such as those in Yellowstone National Park in the United States.
[9] Greenhouse effect is caused by –
A.
nitrogen
B.
carbon dioxide
C.
carbon monoxide
D.
nitrogen dioxide
Ans:
carbon dioxide
Explanation :
The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface and the lower atmosphere, it results in an elevation of the average surface temperature above what it would be in the absence of the gases. By their percentage contribution to the d effect on Earth the four major gases are: water vapor, 36-70%, carbon dioxide, 9- 26%, methane, 4-9% and ozone, 3-7%.
[10] The polymer used in making plastic crockery is –
A.
Decron
B.
Nylon
C.
Bakelite
D.
Melamine
Ans:
Melamine
Explanation :
Melamine-formaldehyde resin or melamine is used in the manufacture of plastic crockery. Melamine resin or melamine formaldehyde (also shortened to melamine) is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. Melamine resin is often used in kitchen utensils and plates (such as Melmac). Melamine resin utensils and bowls are not microwave safe. As with all thermosetting materials, melamine resin cannot be melted and, therefore, cannot be recycled through melting.
[11] Vulcanization of rubber is carried out by adding –
A.
Sulphur
B.
Carbon
C.
Ozone
D.
Phosphorus
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent “curatives” or “accelerators”. These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties. A vast array of products are made with vulcanized rubber including tires, shoe soles, hoses, and hockey pucks. The process is named after Vulcan, Roman god of fire. Hard vulcanized rubber is sometimes sold under the brand names ebonite or vulcanite, and is used to make hard articles such as bowling balls and saxophone mouth pieces.
[12] Helium gas is used in gas balloons instead of hydrogen gas because it is –
A.
lighter than hydrogen
B.
more abundant than hydrogen
C.
non-combustible
D.
more stable
Ans:
non-combustible
Explanation :
Because of the Archimedes’ principle, a lifting gas is required for aerostats to create buoyancy. Its density is lower than that of air (about 1.29 kg/m3, 1.29 g/ L). Only certain lighter than air gases are suitable as lifting gases. Hydrogen and helium are the most commonly used lift gases. Although helium is twice as heavy as (diatomic) hydrogen, they are both so much lighter than air that this difference is inconsequential. Both provide about 9.8 N of lift (1 Newton is the force required to accelerate 1 kg at 1 m/sec2) per cubic meter of gas at STP. Helium is the second lightest gas. For that reason, it is an attractive gas for lifting as well. A major advantage is that this gas is noncombustible. Today helium is used instead of hydrogen, since it is inert so non-flammable which makes things a lot safer. Hydrogen can ignite very easily when mixed with the oxygen of the surrounding air.
[13] Aspirin is chemically known as –
A.
methyl salicylate
B.
hydroxysalicylate
C.
acetylsalicylic acid
D.
alkylsalicylic acid
Ans:
acetylsalicylic acid
Explanation :
Aspirin (USAN), also known as acetylsalicylic acid, is a salicylate drug, often used as an analgesic to relieve minor aches and pains, as an antipyretic to reduce fever, and as an anti-inflammatory medication. Salicylic acid, the main metabolite of aspirin, is an integral part of human and animal metabolism. While in humans much of it is attributable to diet, a substantial part is synthesized endogenously.
[14] The most abundant element in the human body is –
A.
carbon
B.
iron
C.
nitrogen
D.
oxygen
Ans:
oxygen
Explanation :
The composition of the human body can be looked at from the point of view of either mass composition, or atomic composition. To illustrate both views, the human body is 70% water, and water is 11% hydrogen by mass but 67% hydrogen by atomic percent. Thus, most of the mass of the human body is oxygen, but most of the atoms in the human body are hydrogen atoms.
[15] Dry powder fire extinguishers contain -
A.
sand
B.
sand and sodium carbonate
C.
sand and potassium carbonate
D.
sand and sodium bicarbonate
Ans:
sand and sodium bicarbonate
Explanation :
Dry chemical is a powder based agent that extinguishes by separating the four parts of the fire tetrahedron. It prevents the chemical reactions involving heat, fuel, and oxygen and halts the production of fire sustaining "free-radicals", thus extinguishing the fire. Sodium bicarbonate, "regular" or "ordinary" used on class B and C fires, was the first of the thy chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire.
[16] Which type of glass is used for making glass reinforced plastic?
A.
Pyrex glass
B.
Flint glass
C.
Quartz glass
D.
Fibre glass
Ans:
Fibre glass
Explanation :
Fiberglass is a fiber reinforced polymer made of a plastic matrix reinforced by fine fibers of glass. It is also known as GFK. Fiberglass is a lightweight, extremely strong, and robust material. Although strength properties are somewhat lower than carbon fiber and it is less stiff, the material is typically far less brittle, and the raw materials are much less expensive. Its bulk strength and weight properties are also very favorable when compared to metals, and it can be easily formed using molding processes.
[17] Who invented radar?
A.
Fred Morrison
B.
A H Taylor and Leo C Young
C.
Van Tassel
D.
W. K. Roentgen
Ans:
A H Taylor and Leo C Young
Explanation :
Like many inventions, that of radar is difficult to ascribe to an individual. Robert Watson-Watt is given the credit for inventing the radar. However Albert H. Taylor and Leo C Young at the U.S.
[18] In which following processes light energy is converted into chemical energy?
A.
Respiration
B.
Fermentation
C.
Photosynthesis
D.
Photorespiration
Ans:
Photosynthesis
Explanation :
Photosynthesis is the process by which plants, some bacteria and some protestants use the energy from sunlight to produce glucose from carbon dioxide and water.
[19] What is the common characteristic of the elements of the same group in the periodic table?
A.
Electrons in outer most shell
B.
Total number of electrons
C.
Total number of protons
D.
Atomic weight
Ans:
Electrons in outer most shell
Explanation :
Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the outer orbital.
[20] The fiber least prone to catch fire is –
A.
nylon
B.
polyester
C.
cotton
D.
terylene
Ans:
cotton
Explanation :
The fiber least prone to catch fire is cotton. Besides, in cases of fire due to electricity, cotton is less prone to static electricity buildup than nylon or other synthetics. Cotton and wool are naturally less prone to burning because the fire can be smothered in the thick fibers.
[21] Which of the following hormone is called emergency hormone?
A.
Insulin
B.
Adrenaline
C.
Oestrogen
D.
Oxytocir
Ans:
Adrenaline
Explanation :
Adrenaline increases the heart beat and breathing rate which results in the supply of more oxygen to muscles. It reduces the blood to the digestive system and skin; as a result the blood further reaches the skeletal muscles.
[22] Polythene is industrially prepared by the polymerization of -
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a small hydrocarbon gas. It is naturally occurring, but it can also occur as a result of combustion and other processes.
[23] Molasses a by-product in the manufacture of sugar, is converted into -
A.
alcohol
B.
paper
C.
fuel
D.
pulp
Ans:
alcohol
Explanation :
Molasses are the principal ingredient in the distillation of rum. Rum is therefore common in regions of the world where sugarcane or sugar beets are heavily cultivated. It is used in the manufacture of ethyl alcohol for industry and as an ingredient in cattle feed.
[24] The wire of flash bulb is made of :
A.
Copper
B.
Barium
C.
Magnesium
D.
Silver
Ans:
Magnesium
Explanation :
The first modern photoflash bulb (or flashbulb) was made by Austrian Paul Vierkotter, who used magnesium coated wire in an evacuated glass globe. It was later determined that aluminum foil in a low pressure oxygen atmosphere worked even better, and was cheaper to produce.
[25] The coloured discharge tubes for advertisement mainly contain -
A.
Xenon
B.
Argon
C.
Helium
D.
Neon
Ans:
Neon
Explanation :
Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in high- voltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.
Explanation :
Most of the human body is made up of water, H2O, with cells consisting of 65-90% water by weight. Therefore, it isn't surprising that most of a human body's mass is oxygen. Carbon, the basic unit for organic molecules, comes in second. 99% of the mass of the human body is made up of just six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.
[2] Which of the following acids is present in sour milk?
A.
Formic acid
B.
Lactic acid
C.
Citric acid
D.
Tartaric acid
Ans:
Lactic acid
Explanation :
Sour Tasting milk products, like yogurt, butter milk, etc developed sour taste as milk is cultured with lactic acid bacteria.
[3] Non-metallic oxides are in nature.
A.
Basic
B.
Acidic
C.
Neutral
D.
None of the above
Ans:
Acidic
Explanation :
Reaction between a non-metallic oxide and an acid leads to the formation of a salt and water. This is similar to the reaction between a base and an acid; we can conclude that nonmetallic oxides are acidic in nature.
[4] Detergents used for cleaning clothes and utensils contain –
A.
nitrates
B.
bicarbonates
C.
sulphonates
D.
bismuthates
Ans:
sulphonates
Explanation :
Sulphonate is a detergent used for cleaning clothes and utensils. It is a salt or ester of any sulphonic acid.
[5] Radioactive disintegration of uranium ultimately results in formation of –
A.
radium
B.
thorium
C.
polonium
D.
lead
Ans:
lead
Explanation :
Uranium-lead (U-Pb) dating is one of the oldest and most refined of the radiometric dating schemes, with a routine age range of about 1 million years to over 4.5 billion years, and with routine precisions in the 0.1-1 percent range.
[6] Impure camphor is purified by –
A.
sublimation
B.
fractional crystallisation
C.
fractional distillation
D.
steam distillation
Ans:
sublimation
Explanation :
Sublimation apparatus is a piece of laboratory glassware used in the technique of sublimation usually used by chemists to purify compounds. Typically a solid is placed in a vessel which is then heated under vacuum. Under this reduced pressure the solid volatilizes and condenses as a purified compound on a cooled surface, leaving the non-volatile residue impurities behind. This cooled surface often takes the form of a cold finger. Once heating ceases and the vacuum is released, the sublimed compound can be collected from the cooled surface. Impure camphor is purified by this process.
[7] Which among the following stage is suitable indicator when solution of sodium carbonate is mixed with sulphuric acid?
A.
Methylene blue
B.
Methyl red
C.
Phenolphthaline
D.
Methyl orange
Ans:
Methyl orange
Explanation :
Methyl orange is a pH indicator frequently used in titrations. It is often used in titrations because of its clear and distinct colour change. Because it changes colour at the pH of a mid-strength acid, it is usually used in titrations for acids.
[8] In which of the following states maximum iron are is found?
A.
FeCO3
B.
Fe2O3
C.
Fe3O4
D.
FeS2
Ans:
Fe2O3
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The iron itself is usually found in the form of magnetite (Fe3O4), hematite (Fe2O3), goethite (FeO(OH), limonite (FeO(OH).n(H2O)) or siderite (FeCO3). Hematite, also spelled as haematite, is the mineral form of iron(III) oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Huge deposits of hematite are found in banded iron formations. Gray hematite is typically found in places where there has been standing water or mineral hot springs, such as those in Yellowstone National Park in the United States.
[9] Greenhouse effect is caused by –
A.
nitrogen
B.
carbon dioxide
C.
carbon monoxide
D.
nitrogen dioxide
Ans:
carbon dioxide
Explanation :
The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface and the lower atmosphere, it results in an elevation of the average surface temperature above what it would be in the absence of the gases. By their percentage contribution to the d effect on Earth the four major gases are: water vapor, 36-70%, carbon dioxide, 9- 26%, methane, 4-9% and ozone, 3-7%.
[10] The polymer used in making plastic crockery is –
A.
Decron
B.
Nylon
C.
Bakelite
D.
Melamine
Ans:
Melamine
Explanation :
Melamine-formaldehyde resin or melamine is used in the manufacture of plastic crockery. Melamine resin or melamine formaldehyde (also shortened to melamine) is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. Melamine resin is often used in kitchen utensils and plates (such as Melmac). Melamine resin utensils and bowls are not microwave safe. As with all thermosetting materials, melamine resin cannot be melted and, therefore, cannot be recycled through melting.
[11] Vulcanization of rubber is carried out by adding –
A.
Sulphur
B.
Carbon
C.
Ozone
D.
Phosphorus
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent “curatives” or “accelerators”. These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties. A vast array of products are made with vulcanized rubber including tires, shoe soles, hoses, and hockey pucks. The process is named after Vulcan, Roman god of fire. Hard vulcanized rubber is sometimes sold under the brand names ebonite or vulcanite, and is used to make hard articles such as bowling balls and saxophone mouth pieces.
[12] Helium gas is used in gas balloons instead of hydrogen gas because it is –
A.
lighter than hydrogen
B.
more abundant than hydrogen
C.
non-combustible
D.
more stable
Ans:
non-combustible
Explanation :
Because of the Archimedes’ principle, a lifting gas is required for aerostats to create buoyancy. Its density is lower than that of air (about 1.29 kg/m3, 1.29 g/ L). Only certain lighter than air gases are suitable as lifting gases. Hydrogen and helium are the most commonly used lift gases. Although helium is twice as heavy as (diatomic) hydrogen, they are both so much lighter than air that this difference is inconsequential. Both provide about 9.8 N of lift (1 Newton is the force required to accelerate 1 kg at 1 m/sec2) per cubic meter of gas at STP. Helium is the second lightest gas. For that reason, it is an attractive gas for lifting as well. A major advantage is that this gas is noncombustible. Today helium is used instead of hydrogen, since it is inert so non-flammable which makes things a lot safer. Hydrogen can ignite very easily when mixed with the oxygen of the surrounding air.
[13] Aspirin is chemically known as –
A.
methyl salicylate
B.
hydroxysalicylate
C.
acetylsalicylic acid
D.
alkylsalicylic acid
Ans:
acetylsalicylic acid
Explanation :
Aspirin (USAN), also known as acetylsalicylic acid, is a salicylate drug, often used as an analgesic to relieve minor aches and pains, as an antipyretic to reduce fever, and as an anti-inflammatory medication. Salicylic acid, the main metabolite of aspirin, is an integral part of human and animal metabolism. While in humans much of it is attributable to diet, a substantial part is synthesized endogenously.
[14] The most abundant element in the human body is –
A.
carbon
B.
iron
C.
nitrogen
D.
oxygen
Ans:
oxygen
Explanation :
The composition of the human body can be looked at from the point of view of either mass composition, or atomic composition. To illustrate both views, the human body is 70% water, and water is 11% hydrogen by mass but 67% hydrogen by atomic percent. Thus, most of the mass of the human body is oxygen, but most of the atoms in the human body are hydrogen atoms.
[15] Dry powder fire extinguishers contain -
A.
sand
B.
sand and sodium carbonate
C.
sand and potassium carbonate
D.
sand and sodium bicarbonate
Ans:
sand and sodium bicarbonate
Explanation :
Dry chemical is a powder based agent that extinguishes by separating the four parts of the fire tetrahedron. It prevents the chemical reactions involving heat, fuel, and oxygen and halts the production of fire sustaining "free-radicals", thus extinguishing the fire. Sodium bicarbonate, "regular" or "ordinary" used on class B and C fires, was the first of the thy chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire.
[16] Which type of glass is used for making glass reinforced plastic?
A.
Pyrex glass
B.
Flint glass
C.
Quartz glass
D.
Fibre glass
Ans:
Fibre glass
Explanation :
Fiberglass is a fiber reinforced polymer made of a plastic matrix reinforced by fine fibers of glass. It is also known as GFK. Fiberglass is a lightweight, extremely strong, and robust material. Although strength properties are somewhat lower than carbon fiber and it is less stiff, the material is typically far less brittle, and the raw materials are much less expensive. Its bulk strength and weight properties are also very favorable when compared to metals, and it can be easily formed using molding processes.
[17] Who invented radar?
A.
Fred Morrison
B.
A H Taylor and Leo C Young
C.
Van Tassel
D.
W. K. Roentgen
Ans:
A H Taylor and Leo C Young
Explanation :
Like many inventions, that of radar is difficult to ascribe to an individual. Robert Watson-Watt is given the credit for inventing the radar. However Albert H. Taylor and Leo C Young at the U.S.
[18] In which following processes light energy is converted into chemical energy?
A.
Respiration
B.
Fermentation
C.
Photosynthesis
D.
Photorespiration
Ans:
Photosynthesis
Explanation :
Photosynthesis is the process by which plants, some bacteria and some protestants use the energy from sunlight to produce glucose from carbon dioxide and water.
[19] What is the common characteristic of the elements of the same group in the periodic table?
A.
Electrons in outer most shell
B.
Total number of electrons
C.
Total number of protons
D.
Atomic weight
Ans:
Electrons in outer most shell
Explanation :
Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the outer orbital.
[20] The fiber least prone to catch fire is –
A.
nylon
B.
polyester
C.
cotton
D.
terylene
Ans:
cotton
Explanation :
The fiber least prone to catch fire is cotton. Besides, in cases of fire due to electricity, cotton is less prone to static electricity buildup than nylon or other synthetics. Cotton and wool are naturally less prone to burning because the fire can be smothered in the thick fibers.
[21] Which of the following hormone is called emergency hormone?
A.
Insulin
B.
Adrenaline
C.
Oestrogen
D.
Oxytocir
Ans:
Adrenaline
Explanation :
Adrenaline increases the heart beat and breathing rate which results in the supply of more oxygen to muscles. It reduces the blood to the digestive system and skin; as a result the blood further reaches the skeletal muscles.
[22] Polythene is industrially prepared by the polymerization of -
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a small hydrocarbon gas. It is naturally occurring, but it can also occur as a result of combustion and other processes.
[23] Molasses a by-product in the manufacture of sugar, is converted into -
A.
alcohol
B.
paper
C.
fuel
D.
pulp
Ans:
alcohol
Explanation :
Molasses are the principal ingredient in the distillation of rum. Rum is therefore common in regions of the world where sugarcane or sugar beets are heavily cultivated. It is used in the manufacture of ethyl alcohol for industry and as an ingredient in cattle feed.
[24] The wire of flash bulb is made of :
A.
Copper
B.
Barium
C.
Magnesium
D.
Silver
Ans:
Magnesium
Explanation :
The first modern photoflash bulb (or flashbulb) was made by Austrian Paul Vierkotter, who used magnesium coated wire in an evacuated glass globe. It was later determined that aluminum foil in a low pressure oxygen atmosphere worked even better, and was cheaper to produce.
[25] The coloured discharge tubes for advertisement mainly contain -
A.
Xenon
B.
Argon
C.
Helium
D.
Neon
Ans:
Neon
Explanation :
Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in high- voltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.
Explanation :
Reaction between a non-metallic oxide and an acid leads to the formation of a salt and water. This is similar to the reaction between a base and an acid; we can conclude that nonmetallic oxides are acidic in nature.
[4] Detergents used for cleaning clothes and utensils contain –
A.
nitrates
B.
bicarbonates
C.
sulphonates
D.
bismuthates
Ans:
sulphonates
Explanation :
Sulphonate is a detergent used for cleaning clothes and utensils. It is a salt or ester of any sulphonic acid.
[5] Radioactive disintegration of uranium ultimately results in formation of –
A.
radium
B.
thorium
C.
polonium
D.
lead
Ans:
lead
Explanation :
Uranium-lead (U-Pb) dating is one of the oldest and most refined of the radiometric dating schemes, with a routine age range of about 1 million years to over 4.5 billion years, and with routine precisions in the 0.1-1 percent range.
[6] Impure camphor is purified by –
A.
sublimation
B.
fractional crystallisation
C.
fractional distillation
D.
steam distillation
Ans:
sublimation
Explanation :
Sublimation apparatus is a piece of laboratory glassware used in the technique of sublimation usually used by chemists to purify compounds. Typically a solid is placed in a vessel which is then heated under vacuum. Under this reduced pressure the solid volatilizes and condenses as a purified compound on a cooled surface, leaving the non-volatile residue impurities behind. This cooled surface often takes the form of a cold finger. Once heating ceases and the vacuum is released, the sublimed compound can be collected from the cooled surface. Impure camphor is purified by this process.
[7] Which among the following stage is suitable indicator when solution of sodium carbonate is mixed with sulphuric acid?
A.
Methylene blue
B.
Methyl red
C.
Phenolphthaline
D.
Methyl orange
Ans:
Methyl orange
Explanation :
Methyl orange is a pH indicator frequently used in titrations. It is often used in titrations because of its clear and distinct colour change. Because it changes colour at the pH of a mid-strength acid, it is usually used in titrations for acids.
[8] In which of the following states maximum iron are is found?
A.
FeCO3
B.
Fe2O3
C.
Fe3O4
D.
FeS2
Ans:
Fe2O3
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The iron itself is usually found in the form of magnetite (Fe3O4), hematite (Fe2O3), goethite (FeO(OH), limonite (FeO(OH).n(H2O)) or siderite (FeCO3). Hematite, also spelled as haematite, is the mineral form of iron(III) oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Huge deposits of hematite are found in banded iron formations. Gray hematite is typically found in places where there has been standing water or mineral hot springs, such as those in Yellowstone National Park in the United States.
[9] Greenhouse effect is caused by –
A.
nitrogen
B.
carbon dioxide
C.
carbon monoxide
D.
nitrogen dioxide
Ans:
carbon dioxide
Explanation :
The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface and the lower atmosphere, it results in an elevation of the average surface temperature above what it would be in the absence of the gases. By their percentage contribution to the d effect on Earth the four major gases are: water vapor, 36-70%, carbon dioxide, 9- 26%, methane, 4-9% and ozone, 3-7%.
[10] The polymer used in making plastic crockery is –
A.
Decron
B.
Nylon
C.
Bakelite
D.
Melamine
Ans:
Melamine
Explanation :
Melamine-formaldehyde resin or melamine is used in the manufacture of plastic crockery. Melamine resin or melamine formaldehyde (also shortened to melamine) is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. Melamine resin is often used in kitchen utensils and plates (such as Melmac). Melamine resin utensils and bowls are not microwave safe. As with all thermosetting materials, melamine resin cannot be melted and, therefore, cannot be recycled through melting.
[11] Vulcanization of rubber is carried out by adding –
A.
Sulphur
B.
Carbon
C.
Ozone
D.
Phosphorus
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent “curatives” or “accelerators”. These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties. A vast array of products are made with vulcanized rubber including tires, shoe soles, hoses, and hockey pucks. The process is named after Vulcan, Roman god of fire. Hard vulcanized rubber is sometimes sold under the brand names ebonite or vulcanite, and is used to make hard articles such as bowling balls and saxophone mouth pieces.
[12] Helium gas is used in gas balloons instead of hydrogen gas because it is –
A.
lighter than hydrogen
B.
more abundant than hydrogen
C.
non-combustible
D.
more stable
Ans:
non-combustible
Explanation :
Because of the Archimedes’ principle, a lifting gas is required for aerostats to create buoyancy. Its density is lower than that of air (about 1.29 kg/m3, 1.29 g/ L). Only certain lighter than air gases are suitable as lifting gases. Hydrogen and helium are the most commonly used lift gases. Although helium is twice as heavy as (diatomic) hydrogen, they are both so much lighter than air that this difference is inconsequential. Both provide about 9.8 N of lift (1 Newton is the force required to accelerate 1 kg at 1 m/sec2) per cubic meter of gas at STP. Helium is the second lightest gas. For that reason, it is an attractive gas for lifting as well. A major advantage is that this gas is noncombustible. Today helium is used instead of hydrogen, since it is inert so non-flammable which makes things a lot safer. Hydrogen can ignite very easily when mixed with the oxygen of the surrounding air.
[13] Aspirin is chemically known as –
A.
methyl salicylate
B.
hydroxysalicylate
C.
acetylsalicylic acid
D.
alkylsalicylic acid
Ans:
acetylsalicylic acid
Explanation :
Aspirin (USAN), also known as acetylsalicylic acid, is a salicylate drug, often used as an analgesic to relieve minor aches and pains, as an antipyretic to reduce fever, and as an anti-inflammatory medication. Salicylic acid, the main metabolite of aspirin, is an integral part of human and animal metabolism. While in humans much of it is attributable to diet, a substantial part is synthesized endogenously.
[14] The most abundant element in the human body is –
A.
carbon
B.
iron
C.
nitrogen
D.
oxygen
Ans:
oxygen
Explanation :
The composition of the human body can be looked at from the point of view of either mass composition, or atomic composition. To illustrate both views, the human body is 70% water, and water is 11% hydrogen by mass but 67% hydrogen by atomic percent. Thus, most of the mass of the human body is oxygen, but most of the atoms in the human body are hydrogen atoms.
[15] Dry powder fire extinguishers contain -
A.
sand
B.
sand and sodium carbonate
C.
sand and potassium carbonate
D.
sand and sodium bicarbonate
Ans:
sand and sodium bicarbonate
Explanation :
Dry chemical is a powder based agent that extinguishes by separating the four parts of the fire tetrahedron. It prevents the chemical reactions involving heat, fuel, and oxygen and halts the production of fire sustaining "free-radicals", thus extinguishing the fire. Sodium bicarbonate, "regular" or "ordinary" used on class B and C fires, was the first of the thy chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire.
[16] Which type of glass is used for making glass reinforced plastic?
A.
Pyrex glass
B.
Flint glass
C.
Quartz glass
D.
Fibre glass
Ans:
Fibre glass
Explanation :
Fiberglass is a fiber reinforced polymer made of a plastic matrix reinforced by fine fibers of glass. It is also known as GFK. Fiberglass is a lightweight, extremely strong, and robust material. Although strength properties are somewhat lower than carbon fiber and it is less stiff, the material is typically far less brittle, and the raw materials are much less expensive. Its bulk strength and weight properties are also very favorable when compared to metals, and it can be easily formed using molding processes.
[17] Who invented radar?
A.
Fred Morrison
B.
A H Taylor and Leo C Young
C.
Van Tassel
D.
W. K. Roentgen
Ans:
A H Taylor and Leo C Young
Explanation :
Like many inventions, that of radar is difficult to ascribe to an individual. Robert Watson-Watt is given the credit for inventing the radar. However Albert H. Taylor and Leo C Young at the U.S.
[18] In which following processes light energy is converted into chemical energy?
A.
Respiration
B.
Fermentation
C.
Photosynthesis
D.
Photorespiration
Ans:
Photosynthesis
Explanation :
Photosynthesis is the process by which plants, some bacteria and some protestants use the energy from sunlight to produce glucose from carbon dioxide and water.
[19] What is the common characteristic of the elements of the same group in the periodic table?
A.
Electrons in outer most shell
B.
Total number of electrons
C.
Total number of protons
D.
Atomic weight
Ans:
Electrons in outer most shell
Explanation :
Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the outer orbital.
[20] The fiber least prone to catch fire is –
A.
nylon
B.
polyester
C.
cotton
D.
terylene
Ans:
cotton
Explanation :
The fiber least prone to catch fire is cotton. Besides, in cases of fire due to electricity, cotton is less prone to static electricity buildup than nylon or other synthetics. Cotton and wool are naturally less prone to burning because the fire can be smothered in the thick fibers.
[21] Which of the following hormone is called emergency hormone?
A.
Insulin
B.
Adrenaline
C.
Oestrogen
D.
Oxytocir
Ans:
Adrenaline
Explanation :
Adrenaline increases the heart beat and breathing rate which results in the supply of more oxygen to muscles. It reduces the blood to the digestive system and skin; as a result the blood further reaches the skeletal muscles.
[22] Polythene is industrially prepared by the polymerization of -
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a small hydrocarbon gas. It is naturally occurring, but it can also occur as a result of combustion and other processes.
[23] Molasses a by-product in the manufacture of sugar, is converted into -
A.
alcohol
B.
paper
C.
fuel
D.
pulp
Ans:
alcohol
Explanation :
Molasses are the principal ingredient in the distillation of rum. Rum is therefore common in regions of the world where sugarcane or sugar beets are heavily cultivated. It is used in the manufacture of ethyl alcohol for industry and as an ingredient in cattle feed.
[24] The wire of flash bulb is made of :
A.
Copper
B.
Barium
C.
Magnesium
D.
Silver
Ans:
Magnesium
Explanation :
The first modern photoflash bulb (or flashbulb) was made by Austrian Paul Vierkotter, who used magnesium coated wire in an evacuated glass globe. It was later determined that aluminum foil in a low pressure oxygen atmosphere worked even better, and was cheaper to produce.
[25] The coloured discharge tubes for advertisement mainly contain -
A.
Xenon
B.
Argon
C.
Helium
D.
Neon
Ans:
Neon
Explanation :
Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in high- voltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.
Explanation :
Uranium-lead (U-Pb) dating is one of the oldest and most refined of the radiometric dating schemes, with a routine age range of about 1 million years to over 4.5 billion years, and with routine precisions in the 0.1-1 percent range.
[6] Impure camphor is purified by –
A.
sublimation
B.
fractional crystallisation
C.
fractional distillation
D.
steam distillation
Ans:
sublimation
Explanation :
Sublimation apparatus is a piece of laboratory glassware used in the technique of sublimation usually used by chemists to purify compounds. Typically a solid is placed in a vessel which is then heated under vacuum. Under this reduced pressure the solid volatilizes and condenses as a purified compound on a cooled surface, leaving the non-volatile residue impurities behind. This cooled surface often takes the form of a cold finger. Once heating ceases and the vacuum is released, the sublimed compound can be collected from the cooled surface. Impure camphor is purified by this process.
[7] Which among the following stage is suitable indicator when solution of sodium carbonate is mixed with sulphuric acid?
A.
Methylene blue
B.
Methyl red
C.
Phenolphthaline
D.
Methyl orange
Ans:
Methyl orange
Explanation :
Methyl orange is a pH indicator frequently used in titrations. It is often used in titrations because of its clear and distinct colour change. Because it changes colour at the pH of a mid-strength acid, it is usually used in titrations for acids.
[8] In which of the following states maximum iron are is found?
A.
FeCO3
B.
Fe2O3
C.
Fe3O4
D.
FeS2
Ans:
Fe2O3
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The iron itself is usually found in the form of magnetite (Fe3O4), hematite (Fe2O3), goethite (FeO(OH), limonite (FeO(OH).n(H2O)) or siderite (FeCO3). Hematite, also spelled as haematite, is the mineral form of iron(III) oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Huge deposits of hematite are found in banded iron formations. Gray hematite is typically found in places where there has been standing water or mineral hot springs, such as those in Yellowstone National Park in the United States.
[9] Greenhouse effect is caused by –
A.
nitrogen
B.
carbon dioxide
C.
carbon monoxide
D.
nitrogen dioxide
Ans:
carbon dioxide
Explanation :
The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface and the lower atmosphere, it results in an elevation of the average surface temperature above what it would be in the absence of the gases. By their percentage contribution to the d effect on Earth the four major gases are: water vapor, 36-70%, carbon dioxide, 9- 26%, methane, 4-9% and ozone, 3-7%.
[10] The polymer used in making plastic crockery is –
A.
Decron
B.
Nylon
C.
Bakelite
D.
Melamine
Ans:
Melamine
Explanation :
Melamine-formaldehyde resin or melamine is used in the manufacture of plastic crockery. Melamine resin or melamine formaldehyde (also shortened to melamine) is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. Melamine resin is often used in kitchen utensils and plates (such as Melmac). Melamine resin utensils and bowls are not microwave safe. As with all thermosetting materials, melamine resin cannot be melted and, therefore, cannot be recycled through melting.
[11] Vulcanization of rubber is carried out by adding –
A.
Sulphur
B.
Carbon
C.
Ozone
D.
Phosphorus
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent “curatives” or “accelerators”. These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties. A vast array of products are made with vulcanized rubber including tires, shoe soles, hoses, and hockey pucks. The process is named after Vulcan, Roman god of fire. Hard vulcanized rubber is sometimes sold under the brand names ebonite or vulcanite, and is used to make hard articles such as bowling balls and saxophone mouth pieces.
[12] Helium gas is used in gas balloons instead of hydrogen gas because it is –
A.
lighter than hydrogen
B.
more abundant than hydrogen
C.
non-combustible
D.
more stable
Ans:
non-combustible
Explanation :
Because of the Archimedes’ principle, a lifting gas is required for aerostats to create buoyancy. Its density is lower than that of air (about 1.29 kg/m3, 1.29 g/ L). Only certain lighter than air gases are suitable as lifting gases. Hydrogen and helium are the most commonly used lift gases. Although helium is twice as heavy as (diatomic) hydrogen, they are both so much lighter than air that this difference is inconsequential. Both provide about 9.8 N of lift (1 Newton is the force required to accelerate 1 kg at 1 m/sec2) per cubic meter of gas at STP. Helium is the second lightest gas. For that reason, it is an attractive gas for lifting as well. A major advantage is that this gas is noncombustible. Today helium is used instead of hydrogen, since it is inert so non-flammable which makes things a lot safer. Hydrogen can ignite very easily when mixed with the oxygen of the surrounding air.
[13] Aspirin is chemically known as –
A.
methyl salicylate
B.
hydroxysalicylate
C.
acetylsalicylic acid
D.
alkylsalicylic acid
Ans:
acetylsalicylic acid
Explanation :
Aspirin (USAN), also known as acetylsalicylic acid, is a salicylate drug, often used as an analgesic to relieve minor aches and pains, as an antipyretic to reduce fever, and as an anti-inflammatory medication. Salicylic acid, the main metabolite of aspirin, is an integral part of human and animal metabolism. While in humans much of it is attributable to diet, a substantial part is synthesized endogenously.
[14] The most abundant element in the human body is –
A.
carbon
B.
iron
C.
nitrogen
D.
oxygen
Ans:
oxygen
Explanation :
The composition of the human body can be looked at from the point of view of either mass composition, or atomic composition. To illustrate both views, the human body is 70% water, and water is 11% hydrogen by mass but 67% hydrogen by atomic percent. Thus, most of the mass of the human body is oxygen, but most of the atoms in the human body are hydrogen atoms.
[15] Dry powder fire extinguishers contain -
A.
sand
B.
sand and sodium carbonate
C.
sand and potassium carbonate
D.
sand and sodium bicarbonate
Ans:
sand and sodium bicarbonate
Explanation :
Dry chemical is a powder based agent that extinguishes by separating the four parts of the fire tetrahedron. It prevents the chemical reactions involving heat, fuel, and oxygen and halts the production of fire sustaining "free-radicals", thus extinguishing the fire. Sodium bicarbonate, "regular" or "ordinary" used on class B and C fires, was the first of the thy chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire.
[16] Which type of glass is used for making glass reinforced plastic?
A.
Pyrex glass
B.
Flint glass
C.
Quartz glass
D.
Fibre glass
Ans:
Fibre glass
Explanation :
Fiberglass is a fiber reinforced polymer made of a plastic matrix reinforced by fine fibers of glass. It is also known as GFK. Fiberglass is a lightweight, extremely strong, and robust material. Although strength properties are somewhat lower than carbon fiber and it is less stiff, the material is typically far less brittle, and the raw materials are much less expensive. Its bulk strength and weight properties are also very favorable when compared to metals, and it can be easily formed using molding processes.
[17] Who invented radar?
A.
Fred Morrison
B.
A H Taylor and Leo C Young
C.
Van Tassel
D.
W. K. Roentgen
Ans:
A H Taylor and Leo C Young
Explanation :
Like many inventions, that of radar is difficult to ascribe to an individual. Robert Watson-Watt is given the credit for inventing the radar. However Albert H. Taylor and Leo C Young at the U.S.
[18] In which following processes light energy is converted into chemical energy?
A.
Respiration
B.
Fermentation
C.
Photosynthesis
D.
Photorespiration
Ans:
Photosynthesis
Explanation :
Photosynthesis is the process by which plants, some bacteria and some protestants use the energy from sunlight to produce glucose from carbon dioxide and water.
[19] What is the common characteristic of the elements of the same group in the periodic table?
A.
Electrons in outer most shell
B.
Total number of electrons
C.
Total number of protons
D.
Atomic weight
Ans:
Electrons in outer most shell
Explanation :
Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the outer orbital.
[20] The fiber least prone to catch fire is –
A.
nylon
B.
polyester
C.
cotton
D.
terylene
Ans:
cotton
Explanation :
The fiber least prone to catch fire is cotton. Besides, in cases of fire due to electricity, cotton is less prone to static electricity buildup than nylon or other synthetics. Cotton and wool are naturally less prone to burning because the fire can be smothered in the thick fibers.
[21] Which of the following hormone is called emergency hormone?
A.
Insulin
B.
Adrenaline
C.
Oestrogen
D.
Oxytocir
Ans:
Adrenaline
Explanation :
Adrenaline increases the heart beat and breathing rate which results in the supply of more oxygen to muscles. It reduces the blood to the digestive system and skin; as a result the blood further reaches the skeletal muscles.
[22] Polythene is industrially prepared by the polymerization of -
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a small hydrocarbon gas. It is naturally occurring, but it can also occur as a result of combustion and other processes.
[23] Molasses a by-product in the manufacture of sugar, is converted into -
A.
alcohol
B.
paper
C.
fuel
D.
pulp
Ans:
alcohol
Explanation :
Molasses are the principal ingredient in the distillation of rum. Rum is therefore common in regions of the world where sugarcane or sugar beets are heavily cultivated. It is used in the manufacture of ethyl alcohol for industry and as an ingredient in cattle feed.
[24] The wire of flash bulb is made of :
A.
Copper
B.
Barium
C.
Magnesium
D.
Silver
Ans:
Magnesium
Explanation :
The first modern photoflash bulb (or flashbulb) was made by Austrian Paul Vierkotter, who used magnesium coated wire in an evacuated glass globe. It was later determined that aluminum foil in a low pressure oxygen atmosphere worked even better, and was cheaper to produce.
[25] The coloured discharge tubes for advertisement mainly contain -
A.
Xenon
B.
Argon
C.
Helium
D.
Neon
Ans:
Neon
Explanation :
Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in high- voltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.
Explanation :
Methyl orange is a pH indicator frequently used in titrations. It is often used in titrations because of its clear and distinct colour change. Because it changes colour at the pH of a mid-strength acid, it is usually used in titrations for acids.
[8] In which of the following states maximum iron are is found?
A.
FeCO3
B.
Fe2O3
C.
Fe3O4
D.
FeS2
Ans:
Fe2O3
Explanation :
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The iron itself is usually found in the form of magnetite (Fe3O4), hematite (Fe2O3), goethite (FeO(OH), limonite (FeO(OH).n(H2O)) or siderite (FeCO3). Hematite, also spelled as haematite, is the mineral form of iron(III) oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Huge deposits of hematite are found in banded iron formations. Gray hematite is typically found in places where there has been standing water or mineral hot springs, such as those in Yellowstone National Park in the United States.
[9] Greenhouse effect is caused by –
A.
nitrogen
B.
carbon dioxide
C.
carbon monoxide
D.
nitrogen dioxide
Ans:
carbon dioxide
Explanation :
The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface and the lower atmosphere, it results in an elevation of the average surface temperature above what it would be in the absence of the gases. By their percentage contribution to the d effect on Earth the four major gases are: water vapor, 36-70%, carbon dioxide, 9- 26%, methane, 4-9% and ozone, 3-7%.
[10] The polymer used in making plastic crockery is –
A.
Decron
B.
Nylon
C.
Bakelite
D.
Melamine
Ans:
Melamine
Explanation :
Melamine-formaldehyde resin or melamine is used in the manufacture of plastic crockery. Melamine resin or melamine formaldehyde (also shortened to melamine) is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. Melamine resin is often used in kitchen utensils and plates (such as Melmac). Melamine resin utensils and bowls are not microwave safe. As with all thermosetting materials, melamine resin cannot be melted and, therefore, cannot be recycled through melting.
[11] Vulcanization of rubber is carried out by adding –
A.
Sulphur
B.
Carbon
C.
Ozone
D.
Phosphorus
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent “curatives” or “accelerators”. These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties. A vast array of products are made with vulcanized rubber including tires, shoe soles, hoses, and hockey pucks. The process is named after Vulcan, Roman god of fire. Hard vulcanized rubber is sometimes sold under the brand names ebonite or vulcanite, and is used to make hard articles such as bowling balls and saxophone mouth pieces.
[12] Helium gas is used in gas balloons instead of hydrogen gas because it is –
A.
lighter than hydrogen
B.
more abundant than hydrogen
C.
non-combustible
D.
more stable
Ans:
non-combustible
Explanation :
Because of the Archimedes’ principle, a lifting gas is required for aerostats to create buoyancy. Its density is lower than that of air (about 1.29 kg/m3, 1.29 g/ L). Only certain lighter than air gases are suitable as lifting gases. Hydrogen and helium are the most commonly used lift gases. Although helium is twice as heavy as (diatomic) hydrogen, they are both so much lighter than air that this difference is inconsequential. Both provide about 9.8 N of lift (1 Newton is the force required to accelerate 1 kg at 1 m/sec2) per cubic meter of gas at STP. Helium is the second lightest gas. For that reason, it is an attractive gas for lifting as well. A major advantage is that this gas is noncombustible. Today helium is used instead of hydrogen, since it is inert so non-flammable which makes things a lot safer. Hydrogen can ignite very easily when mixed with the oxygen of the surrounding air.
[13] Aspirin is chemically known as –
A.
methyl salicylate
B.
hydroxysalicylate
C.
acetylsalicylic acid
D.
alkylsalicylic acid
Ans:
acetylsalicylic acid
Explanation :
Aspirin (USAN), also known as acetylsalicylic acid, is a salicylate drug, often used as an analgesic to relieve minor aches and pains, as an antipyretic to reduce fever, and as an anti-inflammatory medication. Salicylic acid, the main metabolite of aspirin, is an integral part of human and animal metabolism. While in humans much of it is attributable to diet, a substantial part is synthesized endogenously.
[14] The most abundant element in the human body is –
A.
carbon
B.
iron
C.
nitrogen
D.
oxygen
Ans:
oxygen
Explanation :
The composition of the human body can be looked at from the point of view of either mass composition, or atomic composition. To illustrate both views, the human body is 70% water, and water is 11% hydrogen by mass but 67% hydrogen by atomic percent. Thus, most of the mass of the human body is oxygen, but most of the atoms in the human body are hydrogen atoms.
[15] Dry powder fire extinguishers contain -
A.
sand
B.
sand and sodium carbonate
C.
sand and potassium carbonate
D.
sand and sodium bicarbonate
Ans:
sand and sodium bicarbonate
Explanation :
Dry chemical is a powder based agent that extinguishes by separating the four parts of the fire tetrahedron. It prevents the chemical reactions involving heat, fuel, and oxygen and halts the production of fire sustaining "free-radicals", thus extinguishing the fire. Sodium bicarbonate, "regular" or "ordinary" used on class B and C fires, was the first of the thy chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire.
[16] Which type of glass is used for making glass reinforced plastic?
A.
Pyrex glass
B.
Flint glass
C.
Quartz glass
D.
Fibre glass
Ans:
Fibre glass
Explanation :
Fiberglass is a fiber reinforced polymer made of a plastic matrix reinforced by fine fibers of glass. It is also known as GFK. Fiberglass is a lightweight, extremely strong, and robust material. Although strength properties are somewhat lower than carbon fiber and it is less stiff, the material is typically far less brittle, and the raw materials are much less expensive. Its bulk strength and weight properties are also very favorable when compared to metals, and it can be easily formed using molding processes.
[17] Who invented radar?
A.
Fred Morrison
B.
A H Taylor and Leo C Young
C.
Van Tassel
D.
W. K. Roentgen
Ans:
A H Taylor and Leo C Young
Explanation :
Like many inventions, that of radar is difficult to ascribe to an individual. Robert Watson-Watt is given the credit for inventing the radar. However Albert H. Taylor and Leo C Young at the U.S.
[18] In which following processes light energy is converted into chemical energy?
A.
Respiration
B.
Fermentation
C.
Photosynthesis
D.
Photorespiration
Ans:
Photosynthesis
Explanation :
Photosynthesis is the process by which plants, some bacteria and some protestants use the energy from sunlight to produce glucose from carbon dioxide and water.
[19] What is the common characteristic of the elements of the same group in the periodic table?
A.
Electrons in outer most shell
B.
Total number of electrons
C.
Total number of protons
D.
Atomic weight
Ans:
Electrons in outer most shell
Explanation :
Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the outer orbital.
[20] The fiber least prone to catch fire is –
A.
nylon
B.
polyester
C.
cotton
D.
terylene
Ans:
cotton
Explanation :
The fiber least prone to catch fire is cotton. Besides, in cases of fire due to electricity, cotton is less prone to static electricity buildup than nylon or other synthetics. Cotton and wool are naturally less prone to burning because the fire can be smothered in the thick fibers.
[21] Which of the following hormone is called emergency hormone?
A.
Insulin
B.
Adrenaline
C.
Oestrogen
D.
Oxytocir
Ans:
Adrenaline
Explanation :
Adrenaline increases the heart beat and breathing rate which results in the supply of more oxygen to muscles. It reduces the blood to the digestive system and skin; as a result the blood further reaches the skeletal muscles.
[22] Polythene is industrially prepared by the polymerization of -
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a small hydrocarbon gas. It is naturally occurring, but it can also occur as a result of combustion and other processes.
[23] Molasses a by-product in the manufacture of sugar, is converted into -
A.
alcohol
B.
paper
C.
fuel
D.
pulp
Ans:
alcohol
Explanation :
Molasses are the principal ingredient in the distillation of rum. Rum is therefore common in regions of the world where sugarcane or sugar beets are heavily cultivated. It is used in the manufacture of ethyl alcohol for industry and as an ingredient in cattle feed.
[24] The wire of flash bulb is made of :
A.
Copper
B.
Barium
C.
Magnesium
D.
Silver
Ans:
Magnesium
Explanation :
The first modern photoflash bulb (or flashbulb) was made by Austrian Paul Vierkotter, who used magnesium coated wire in an evacuated glass globe. It was later determined that aluminum foil in a low pressure oxygen atmosphere worked even better, and was cheaper to produce.
[25] The coloured discharge tubes for advertisement mainly contain -
A.
Xenon
B.
Argon
C.
Helium
D.
Neon
Ans:
Neon
Explanation :
Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in high- voltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.
Explanation :
The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface and the lower atmosphere, it results in an elevation of the average surface temperature above what it would be in the absence of the gases. By their percentage contribution to the d effect on Earth the four major gases are: water vapor, 36-70%, carbon dioxide, 9- 26%, methane, 4-9% and ozone, 3-7%.
[10] The polymer used in making plastic crockery is –
A.
Decron
B.
Nylon
C.
Bakelite
D.
Melamine
Ans:
Melamine
Explanation :
Melamine-formaldehyde resin or melamine is used in the manufacture of plastic crockery. Melamine resin or melamine formaldehyde (also shortened to melamine) is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. Melamine resin is often used in kitchen utensils and plates (such as Melmac). Melamine resin utensils and bowls are not microwave safe. As with all thermosetting materials, melamine resin cannot be melted and, therefore, cannot be recycled through melting.
[11] Vulcanization of rubber is carried out by adding –
A.
Sulphur
B.
Carbon
C.
Ozone
D.
Phosphorus
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent “curatives” or “accelerators”. These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties. A vast array of products are made with vulcanized rubber including tires, shoe soles, hoses, and hockey pucks. The process is named after Vulcan, Roman god of fire. Hard vulcanized rubber is sometimes sold under the brand names ebonite or vulcanite, and is used to make hard articles such as bowling balls and saxophone mouth pieces.
[12] Helium gas is used in gas balloons instead of hydrogen gas because it is –
A.
lighter than hydrogen
B.
more abundant than hydrogen
C.
non-combustible
D.
more stable
Ans:
non-combustible
Explanation :
Because of the Archimedes’ principle, a lifting gas is required for aerostats to create buoyancy. Its density is lower than that of air (about 1.29 kg/m3, 1.29 g/ L). Only certain lighter than air gases are suitable as lifting gases. Hydrogen and helium are the most commonly used lift gases. Although helium is twice as heavy as (diatomic) hydrogen, they are both so much lighter than air that this difference is inconsequential. Both provide about 9.8 N of lift (1 Newton is the force required to accelerate 1 kg at 1 m/sec2) per cubic meter of gas at STP. Helium is the second lightest gas. For that reason, it is an attractive gas for lifting as well. A major advantage is that this gas is noncombustible. Today helium is used instead of hydrogen, since it is inert so non-flammable which makes things a lot safer. Hydrogen can ignite very easily when mixed with the oxygen of the surrounding air.
[13] Aspirin is chemically known as –
A.
methyl salicylate
B.
hydroxysalicylate
C.
acetylsalicylic acid
D.
alkylsalicylic acid
Ans:
acetylsalicylic acid
Explanation :
Aspirin (USAN), also known as acetylsalicylic acid, is a salicylate drug, often used as an analgesic to relieve minor aches and pains, as an antipyretic to reduce fever, and as an anti-inflammatory medication. Salicylic acid, the main metabolite of aspirin, is an integral part of human and animal metabolism. While in humans much of it is attributable to diet, a substantial part is synthesized endogenously.
[14] The most abundant element in the human body is –
A.
carbon
B.
iron
C.
nitrogen
D.
oxygen
Ans:
oxygen
Explanation :
The composition of the human body can be looked at from the point of view of either mass composition, or atomic composition. To illustrate both views, the human body is 70% water, and water is 11% hydrogen by mass but 67% hydrogen by atomic percent. Thus, most of the mass of the human body is oxygen, but most of the atoms in the human body are hydrogen atoms.
[15] Dry powder fire extinguishers contain -
A.
sand
B.
sand and sodium carbonate
C.
sand and potassium carbonate
D.
sand and sodium bicarbonate
Ans:
sand and sodium bicarbonate
Explanation :
Dry chemical is a powder based agent that extinguishes by separating the four parts of the fire tetrahedron. It prevents the chemical reactions involving heat, fuel, and oxygen and halts the production of fire sustaining "free-radicals", thus extinguishing the fire. Sodium bicarbonate, "regular" or "ordinary" used on class B and C fires, was the first of the thy chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire.
[16] Which type of glass is used for making glass reinforced plastic?
A.
Pyrex glass
B.
Flint glass
C.
Quartz glass
D.
Fibre glass
Ans:
Fibre glass
Explanation :
Fiberglass is a fiber reinforced polymer made of a plastic matrix reinforced by fine fibers of glass. It is also known as GFK. Fiberglass is a lightweight, extremely strong, and robust material. Although strength properties are somewhat lower than carbon fiber and it is less stiff, the material is typically far less brittle, and the raw materials are much less expensive. Its bulk strength and weight properties are also very favorable when compared to metals, and it can be easily formed using molding processes.
[17] Who invented radar?
A.
Fred Morrison
B.
A H Taylor and Leo C Young
C.
Van Tassel
D.
W. K. Roentgen
Ans:
A H Taylor and Leo C Young
Explanation :
Like many inventions, that of radar is difficult to ascribe to an individual. Robert Watson-Watt is given the credit for inventing the radar. However Albert H. Taylor and Leo C Young at the U.S.
[18] In which following processes light energy is converted into chemical energy?
A.
Respiration
B.
Fermentation
C.
Photosynthesis
D.
Photorespiration
Ans:
Photosynthesis
Explanation :
Photosynthesis is the process by which plants, some bacteria and some protestants use the energy from sunlight to produce glucose from carbon dioxide and water.
[19] What is the common characteristic of the elements of the same group in the periodic table?
A.
Electrons in outer most shell
B.
Total number of electrons
C.
Total number of protons
D.
Atomic weight
Ans:
Electrons in outer most shell
Explanation :
Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the outer orbital.
[20] The fiber least prone to catch fire is –
A.
nylon
B.
polyester
C.
cotton
D.
terylene
Ans:
cotton
Explanation :
The fiber least prone to catch fire is cotton. Besides, in cases of fire due to electricity, cotton is less prone to static electricity buildup than nylon or other synthetics. Cotton and wool are naturally less prone to burning because the fire can be smothered in the thick fibers.
[21] Which of the following hormone is called emergency hormone?
A.
Insulin
B.
Adrenaline
C.
Oestrogen
D.
Oxytocir
Ans:
Adrenaline
Explanation :
Adrenaline increases the heart beat and breathing rate which results in the supply of more oxygen to muscles. It reduces the blood to the digestive system and skin; as a result the blood further reaches the skeletal muscles.
[22] Polythene is industrially prepared by the polymerization of -
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a small hydrocarbon gas. It is naturally occurring, but it can also occur as a result of combustion and other processes.
[23] Molasses a by-product in the manufacture of sugar, is converted into -
A.
alcohol
B.
paper
C.
fuel
D.
pulp
Ans:
alcohol
Explanation :
Molasses are the principal ingredient in the distillation of rum. Rum is therefore common in regions of the world where sugarcane or sugar beets are heavily cultivated. It is used in the manufacture of ethyl alcohol for industry and as an ingredient in cattle feed.
[24] The wire of flash bulb is made of :
A.
Copper
B.
Barium
C.
Magnesium
D.
Silver
Ans:
Magnesium
Explanation :
The first modern photoflash bulb (or flashbulb) was made by Austrian Paul Vierkotter, who used magnesium coated wire in an evacuated glass globe. It was later determined that aluminum foil in a low pressure oxygen atmosphere worked even better, and was cheaper to produce.
[25] The coloured discharge tubes for advertisement mainly contain -
A.
Xenon
B.
Argon
C.
Helium
D.
Neon
Ans:
Neon
Explanation :
Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in high- voltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent “curatives” or “accelerators”. These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties. A vast array of products are made with vulcanized rubber including tires, shoe soles, hoses, and hockey pucks. The process is named after Vulcan, Roman god of fire. Hard vulcanized rubber is sometimes sold under the brand names ebonite or vulcanite, and is used to make hard articles such as bowling balls and saxophone mouth pieces.
[12] Helium gas is used in gas balloons instead of hydrogen gas because it is –
A.
lighter than hydrogen
B.
more abundant than hydrogen
C.
non-combustible
D.
more stable
Ans:
non-combustible
Explanation :
Because of the Archimedes’ principle, a lifting gas is required for aerostats to create buoyancy. Its density is lower than that of air (about 1.29 kg/m3, 1.29 g/ L). Only certain lighter than air gases are suitable as lifting gases. Hydrogen and helium are the most commonly used lift gases. Although helium is twice as heavy as (diatomic) hydrogen, they are both so much lighter than air that this difference is inconsequential. Both provide about 9.8 N of lift (1 Newton is the force required to accelerate 1 kg at 1 m/sec2) per cubic meter of gas at STP. Helium is the second lightest gas. For that reason, it is an attractive gas for lifting as well. A major advantage is that this gas is noncombustible. Today helium is used instead of hydrogen, since it is inert so non-flammable which makes things a lot safer. Hydrogen can ignite very easily when mixed with the oxygen of the surrounding air.
[13] Aspirin is chemically known as –
A.
methyl salicylate
B.
hydroxysalicylate
C.
acetylsalicylic acid
D.
alkylsalicylic acid
Ans:
acetylsalicylic acid
Explanation :
Aspirin (USAN), also known as acetylsalicylic acid, is a salicylate drug, often used as an analgesic to relieve minor aches and pains, as an antipyretic to reduce fever, and as an anti-inflammatory medication. Salicylic acid, the main metabolite of aspirin, is an integral part of human and animal metabolism. While in humans much of it is attributable to diet, a substantial part is synthesized endogenously.
[14] The most abundant element in the human body is –
A.
carbon
B.
iron
C.
nitrogen
D.
oxygen
Ans:
oxygen
Explanation :
The composition of the human body can be looked at from the point of view of either mass composition, or atomic composition. To illustrate both views, the human body is 70% water, and water is 11% hydrogen by mass but 67% hydrogen by atomic percent. Thus, most of the mass of the human body is oxygen, but most of the atoms in the human body are hydrogen atoms.
[15] Dry powder fire extinguishers contain -
A.
sand
B.
sand and sodium carbonate
C.
sand and potassium carbonate
D.
sand and sodium bicarbonate
Ans:
sand and sodium bicarbonate
Explanation :
Dry chemical is a powder based agent that extinguishes by separating the four parts of the fire tetrahedron. It prevents the chemical reactions involving heat, fuel, and oxygen and halts the production of fire sustaining "free-radicals", thus extinguishing the fire. Sodium bicarbonate, "regular" or "ordinary" used on class B and C fires, was the first of the thy chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire.
[16] Which type of glass is used for making glass reinforced plastic?
A.
Pyrex glass
B.
Flint glass
C.
Quartz glass
D.
Fibre glass
Ans:
Fibre glass
Explanation :
Fiberglass is a fiber reinforced polymer made of a plastic matrix reinforced by fine fibers of glass. It is also known as GFK. Fiberglass is a lightweight, extremely strong, and robust material. Although strength properties are somewhat lower than carbon fiber and it is less stiff, the material is typically far less brittle, and the raw materials are much less expensive. Its bulk strength and weight properties are also very favorable when compared to metals, and it can be easily formed using molding processes.
[17] Who invented radar?
A.
Fred Morrison
B.
A H Taylor and Leo C Young
C.
Van Tassel
D.
W. K. Roentgen
Ans:
A H Taylor and Leo C Young
Explanation :
Like many inventions, that of radar is difficult to ascribe to an individual. Robert Watson-Watt is given the credit for inventing the radar. However Albert H. Taylor and Leo C Young at the U.S.
[18] In which following processes light energy is converted into chemical energy?
A.
Respiration
B.
Fermentation
C.
Photosynthesis
D.
Photorespiration
Ans:
Photosynthesis
Explanation :
Photosynthesis is the process by which plants, some bacteria and some protestants use the energy from sunlight to produce glucose from carbon dioxide and water.
[19] What is the common characteristic of the elements of the same group in the periodic table?
A.
Electrons in outer most shell
B.
Total number of electrons
C.
Total number of protons
D.
Atomic weight
Ans:
Electrons in outer most shell
Explanation :
Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the outer orbital.
[20] The fiber least prone to catch fire is –
A.
nylon
B.
polyester
C.
cotton
D.
terylene
Ans:
cotton
Explanation :
The fiber least prone to catch fire is cotton. Besides, in cases of fire due to electricity, cotton is less prone to static electricity buildup than nylon or other synthetics. Cotton and wool are naturally less prone to burning because the fire can be smothered in the thick fibers.
[21] Which of the following hormone is called emergency hormone?
A.
Insulin
B.
Adrenaline
C.
Oestrogen
D.
Oxytocir
Ans:
Adrenaline
Explanation :
Adrenaline increases the heart beat and breathing rate which results in the supply of more oxygen to muscles. It reduces the blood to the digestive system and skin; as a result the blood further reaches the skeletal muscles.
[22] Polythene is industrially prepared by the polymerization of -
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a small hydrocarbon gas. It is naturally occurring, but it can also occur as a result of combustion and other processes.
[23] Molasses a by-product in the manufacture of sugar, is converted into -
A.
alcohol
B.
paper
C.
fuel
D.
pulp
Ans:
alcohol
Explanation :
Molasses are the principal ingredient in the distillation of rum. Rum is therefore common in regions of the world where sugarcane or sugar beets are heavily cultivated. It is used in the manufacture of ethyl alcohol for industry and as an ingredient in cattle feed.
[24] The wire of flash bulb is made of :
A.
Copper
B.
Barium
C.
Magnesium
D.
Silver
Ans:
Magnesium
Explanation :
The first modern photoflash bulb (or flashbulb) was made by Austrian Paul Vierkotter, who used magnesium coated wire in an evacuated glass globe. It was later determined that aluminum foil in a low pressure oxygen atmosphere worked even better, and was cheaper to produce.
[25] The coloured discharge tubes for advertisement mainly contain -
A.
Xenon
B.
Argon
C.
Helium
D.
Neon
Ans:
Neon
Explanation :
Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in high- voltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.
Explanation :
Aspirin (USAN), also known as acetylsalicylic acid, is a salicylate drug, often used as an analgesic to relieve minor aches and pains, as an antipyretic to reduce fever, and as an anti-inflammatory medication. Salicylic acid, the main metabolite of aspirin, is an integral part of human and animal metabolism. While in humans much of it is attributable to diet, a substantial part is synthesized endogenously.
[14] The most abundant element in the human body is –
A.
carbon
B.
iron
C.
nitrogen
D.
oxygen
Ans:
oxygen
Explanation :
The composition of the human body can be looked at from the point of view of either mass composition, or atomic composition. To illustrate both views, the human body is 70% water, and water is 11% hydrogen by mass but 67% hydrogen by atomic percent. Thus, most of the mass of the human body is oxygen, but most of the atoms in the human body are hydrogen atoms.
[15] Dry powder fire extinguishers contain -
A.
sand
B.
sand and sodium carbonate
C.
sand and potassium carbonate
D.
sand and sodium bicarbonate
Ans:
sand and sodium bicarbonate
Explanation :
Dry chemical is a powder based agent that extinguishes by separating the four parts of the fire tetrahedron. It prevents the chemical reactions involving heat, fuel, and oxygen and halts the production of fire sustaining "free-radicals", thus extinguishing the fire. Sodium bicarbonate, "regular" or "ordinary" used on class B and C fires, was the first of the thy chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire.
[16] Which type of glass is used for making glass reinforced plastic?
A.
Pyrex glass
B.
Flint glass
C.
Quartz glass
D.
Fibre glass
Ans:
Fibre glass
Explanation :
Fiberglass is a fiber reinforced polymer made of a plastic matrix reinforced by fine fibers of glass. It is also known as GFK. Fiberglass is a lightweight, extremely strong, and robust material. Although strength properties are somewhat lower than carbon fiber and it is less stiff, the material is typically far less brittle, and the raw materials are much less expensive. Its bulk strength and weight properties are also very favorable when compared to metals, and it can be easily formed using molding processes.
[17] Who invented radar?
A.
Fred Morrison
B.
A H Taylor and Leo C Young
C.
Van Tassel
D.
W. K. Roentgen
Ans:
A H Taylor and Leo C Young
Explanation :
Like many inventions, that of radar is difficult to ascribe to an individual. Robert Watson-Watt is given the credit for inventing the radar. However Albert H. Taylor and Leo C Young at the U.S.
[18] In which following processes light energy is converted into chemical energy?
A.
Respiration
B.
Fermentation
C.
Photosynthesis
D.
Photorespiration
Ans:
Photosynthesis
Explanation :
Photosynthesis is the process by which plants, some bacteria and some protestants use the energy from sunlight to produce glucose from carbon dioxide and water.
[19] What is the common characteristic of the elements of the same group in the periodic table?
A.
Electrons in outer most shell
B.
Total number of electrons
C.
Total number of protons
D.
Atomic weight
Ans:
Electrons in outer most shell
Explanation :
Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the outer orbital.
[20] The fiber least prone to catch fire is –
A.
nylon
B.
polyester
C.
cotton
D.
terylene
Ans:
cotton
Explanation :
The fiber least prone to catch fire is cotton. Besides, in cases of fire due to electricity, cotton is less prone to static electricity buildup than nylon or other synthetics. Cotton and wool are naturally less prone to burning because the fire can be smothered in the thick fibers.
[21] Which of the following hormone is called emergency hormone?
A.
Insulin
B.
Adrenaline
C.
Oestrogen
D.
Oxytocir
Ans:
Adrenaline
Explanation :
Adrenaline increases the heart beat and breathing rate which results in the supply of more oxygen to muscles. It reduces the blood to the digestive system and skin; as a result the blood further reaches the skeletal muscles.
[22] Polythene is industrially prepared by the polymerization of -
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a small hydrocarbon gas. It is naturally occurring, but it can also occur as a result of combustion and other processes.
[23] Molasses a by-product in the manufacture of sugar, is converted into -
A.
alcohol
B.
paper
C.
fuel
D.
pulp
Ans:
alcohol
Explanation :
Molasses are the principal ingredient in the distillation of rum. Rum is therefore common in regions of the world where sugarcane or sugar beets are heavily cultivated. It is used in the manufacture of ethyl alcohol for industry and as an ingredient in cattle feed.
[24] The wire of flash bulb is made of :
A.
Copper
B.
Barium
C.
Magnesium
D.
Silver
Ans:
Magnesium
Explanation :
The first modern photoflash bulb (or flashbulb) was made by Austrian Paul Vierkotter, who used magnesium coated wire in an evacuated glass globe. It was later determined that aluminum foil in a low pressure oxygen atmosphere worked even better, and was cheaper to produce.
[25] The coloured discharge tubes for advertisement mainly contain -
A.
Xenon
B.
Argon
C.
Helium
D.
Neon
Ans:
Neon
Explanation :
Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in high- voltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.
Explanation :
Dry chemical is a powder based agent that extinguishes by separating the four parts of the fire tetrahedron. It prevents the chemical reactions involving heat, fuel, and oxygen and halts the production of fire sustaining "free-radicals", thus extinguishing the fire. Sodium bicarbonate, "regular" or "ordinary" used on class B and C fires, was the first of the thy chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire.
[16] Which type of glass is used for making glass reinforced plastic?
A.
Pyrex glass
B.
Flint glass
C.
Quartz glass
D.
Fibre glass
Ans:
Fibre glass
Explanation :
Fiberglass is a fiber reinforced polymer made of a plastic matrix reinforced by fine fibers of glass. It is also known as GFK. Fiberglass is a lightweight, extremely strong, and robust material. Although strength properties are somewhat lower than carbon fiber and it is less stiff, the material is typically far less brittle, and the raw materials are much less expensive. Its bulk strength and weight properties are also very favorable when compared to metals, and it can be easily formed using molding processes.
[17] Who invented radar?
A.
Fred Morrison
B.
A H Taylor and Leo C Young
C.
Van Tassel
D.
W. K. Roentgen
Ans:
A H Taylor and Leo C Young
Explanation :
Like many inventions, that of radar is difficult to ascribe to an individual. Robert Watson-Watt is given the credit for inventing the radar. However Albert H. Taylor and Leo C Young at the U.S.
[18] In which following processes light energy is converted into chemical energy?
A.
Respiration
B.
Fermentation
C.
Photosynthesis
D.
Photorespiration
Ans:
Photosynthesis
Explanation :
Photosynthesis is the process by which plants, some bacteria and some protestants use the energy from sunlight to produce glucose from carbon dioxide and water.
[19] What is the common characteristic of the elements of the same group in the periodic table?
A.
Electrons in outer most shell
B.
Total number of electrons
C.
Total number of protons
D.
Atomic weight
Ans:
Electrons in outer most shell
Explanation :
Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the outer orbital.
[20] The fiber least prone to catch fire is –
A.
nylon
B.
polyester
C.
cotton
D.
terylene
Ans:
cotton
Explanation :
The fiber least prone to catch fire is cotton. Besides, in cases of fire due to electricity, cotton is less prone to static electricity buildup than nylon or other synthetics. Cotton and wool are naturally less prone to burning because the fire can be smothered in the thick fibers.
[21] Which of the following hormone is called emergency hormone?
A.
Insulin
B.
Adrenaline
C.
Oestrogen
D.
Oxytocir
Ans:
Adrenaline
Explanation :
Adrenaline increases the heart beat and breathing rate which results in the supply of more oxygen to muscles. It reduces the blood to the digestive system and skin; as a result the blood further reaches the skeletal muscles.
[22] Polythene is industrially prepared by the polymerization of -
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a small hydrocarbon gas. It is naturally occurring, but it can also occur as a result of combustion and other processes.
[23] Molasses a by-product in the manufacture of sugar, is converted into -
A.
alcohol
B.
paper
C.
fuel
D.
pulp
Ans:
alcohol
Explanation :
Molasses are the principal ingredient in the distillation of rum. Rum is therefore common in regions of the world where sugarcane or sugar beets are heavily cultivated. It is used in the manufacture of ethyl alcohol for industry and as an ingredient in cattle feed.
[24] The wire of flash bulb is made of :
A.
Copper
B.
Barium
C.
Magnesium
D.
Silver
Ans:
Magnesium
Explanation :
The first modern photoflash bulb (or flashbulb) was made by Austrian Paul Vierkotter, who used magnesium coated wire in an evacuated glass globe. It was later determined that aluminum foil in a low pressure oxygen atmosphere worked even better, and was cheaper to produce.
[25] The coloured discharge tubes for advertisement mainly contain -
A.
Xenon
B.
Argon
C.
Helium
D.
Neon
Ans:
Neon
Explanation :
Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in high- voltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.
Explanation :
Like many inventions, that of radar is difficult to ascribe to an individual. Robert Watson-Watt is given the credit for inventing the radar. However Albert H. Taylor and Leo C Young at the U.S.
[18] In which following processes light energy is converted into chemical energy?
A.
Respiration
B.
Fermentation
C.
Photosynthesis
D.
Photorespiration
Ans:
Photosynthesis
Explanation :
Photosynthesis is the process by which plants, some bacteria and some protestants use the energy from sunlight to produce glucose from carbon dioxide and water.
[19] What is the common characteristic of the elements of the same group in the periodic table?
A.
Electrons in outer most shell
B.
Total number of electrons
C.
Total number of protons
D.
Atomic weight
Ans:
Electrons in outer most shell
Explanation :
Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the outer orbital.
[20] The fiber least prone to catch fire is –
A.
nylon
B.
polyester
C.
cotton
D.
terylene
Ans:
cotton
Explanation :
The fiber least prone to catch fire is cotton. Besides, in cases of fire due to electricity, cotton is less prone to static electricity buildup than nylon or other synthetics. Cotton and wool are naturally less prone to burning because the fire can be smothered in the thick fibers.
[21] Which of the following hormone is called emergency hormone?
A.
Insulin
B.
Adrenaline
C.
Oestrogen
D.
Oxytocir
Ans:
Adrenaline
Explanation :
Adrenaline increases the heart beat and breathing rate which results in the supply of more oxygen to muscles. It reduces the blood to the digestive system and skin; as a result the blood further reaches the skeletal muscles.
[22] Polythene is industrially prepared by the polymerization of -
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a small hydrocarbon gas. It is naturally occurring, but it can also occur as a result of combustion and other processes.
[23] Molasses a by-product in the manufacture of sugar, is converted into -
A.
alcohol
B.
paper
C.
fuel
D.
pulp
Ans:
alcohol
Explanation :
Molasses are the principal ingredient in the distillation of rum. Rum is therefore common in regions of the world where sugarcane or sugar beets are heavily cultivated. It is used in the manufacture of ethyl alcohol for industry and as an ingredient in cattle feed.
[24] The wire of flash bulb is made of :
A.
Copper
B.
Barium
C.
Magnesium
D.
Silver
Ans:
Magnesium
Explanation :
The first modern photoflash bulb (or flashbulb) was made by Austrian Paul Vierkotter, who used magnesium coated wire in an evacuated glass globe. It was later determined that aluminum foil in a low pressure oxygen atmosphere worked even better, and was cheaper to produce.
[25] The coloured discharge tubes for advertisement mainly contain -
A.
Xenon
B.
Argon
C.
Helium
D.
Neon
Ans:
Neon
Explanation :
Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in high- voltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.
Explanation :
Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the outer orbital.
[20] The fiber least prone to catch fire is –
A.
nylon
B.
polyester
C.
cotton
D.
terylene
Ans:
cotton
Explanation :
The fiber least prone to catch fire is cotton. Besides, in cases of fire due to electricity, cotton is less prone to static electricity buildup than nylon or other synthetics. Cotton and wool are naturally less prone to burning because the fire can be smothered in the thick fibers.
[21] Which of the following hormone is called emergency hormone?
A.
Insulin
B.
Adrenaline
C.
Oestrogen
D.
Oxytocir
Ans:
Adrenaline
Explanation :
Adrenaline increases the heart beat and breathing rate which results in the supply of more oxygen to muscles. It reduces the blood to the digestive system and skin; as a result the blood further reaches the skeletal muscles.
[22] Polythene is industrially prepared by the polymerization of -
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a small hydrocarbon gas. It is naturally occurring, but it can also occur as a result of combustion and other processes.
[23] Molasses a by-product in the manufacture of sugar, is converted into -
A.
alcohol
B.
paper
C.
fuel
D.
pulp
Ans:
alcohol
Explanation :
Molasses are the principal ingredient in the distillation of rum. Rum is therefore common in regions of the world where sugarcane or sugar beets are heavily cultivated. It is used in the manufacture of ethyl alcohol for industry and as an ingredient in cattle feed.
[24] The wire of flash bulb is made of :
A.
Copper
B.
Barium
C.
Magnesium
D.
Silver
Ans:
Magnesium
Explanation :
The first modern photoflash bulb (or flashbulb) was made by Austrian Paul Vierkotter, who used magnesium coated wire in an evacuated glass globe. It was later determined that aluminum foil in a low pressure oxygen atmosphere worked even better, and was cheaper to produce.
[25] The coloured discharge tubes for advertisement mainly contain -
A.
Xenon
B.
Argon
C.
Helium
D.
Neon
Ans:
Neon
Explanation :
Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in high- voltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.
Explanation :
Adrenaline increases the heart beat and breathing rate which results in the supply of more oxygen to muscles. It reduces the blood to the digestive system and skin; as a result the blood further reaches the skeletal muscles.
[22] Polythene is industrially prepared by the polymerization of -
A.
Methane
B.
Styrene
C.
Acetylene
D.
Ethylene
Ans:
Ethylene
Explanation :
Ethylene is a small hydrocarbon gas. It is naturally occurring, but it can also occur as a result of combustion and other processes.
[23] Molasses a by-product in the manufacture of sugar, is converted into -
A.
alcohol
B.
paper
C.
fuel
D.
pulp
Ans:
alcohol
Explanation :
Molasses are the principal ingredient in the distillation of rum. Rum is therefore common in regions of the world where sugarcane or sugar beets are heavily cultivated. It is used in the manufacture of ethyl alcohol for industry and as an ingredient in cattle feed.
[24] The wire of flash bulb is made of :
A.
Copper
B.
Barium
C.
Magnesium
D.
Silver
Ans:
Magnesium
Explanation :
The first modern photoflash bulb (or flashbulb) was made by Austrian Paul Vierkotter, who used magnesium coated wire in an evacuated glass globe. It was later determined that aluminum foil in a low pressure oxygen atmosphere worked even better, and was cheaper to produce.
[25] The coloured discharge tubes for advertisement mainly contain -
A.
Xenon
B.
Argon
C.
Helium
D.
Neon
Ans:
Neon
Explanation :
Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in high- voltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.
Explanation :
Molasses are the principal ingredient in the distillation of rum. Rum is therefore common in regions of the world where sugarcane or sugar beets are heavily cultivated. It is used in the manufacture of ethyl alcohol for industry and as an ingredient in cattle feed.
[24] The wire of flash bulb is made of :
A.
Copper
B.
Barium
C.
Magnesium
D.
Silver
Ans:
Magnesium
Explanation :
The first modern photoflash bulb (or flashbulb) was made by Austrian Paul Vierkotter, who used magnesium coated wire in an evacuated glass globe. It was later determined that aluminum foil in a low pressure oxygen atmosphere worked even better, and was cheaper to produce.
[25] The coloured discharge tubes for advertisement mainly contain -
A.
Xenon
B.
Argon
C.
Helium
D.
Neon
Ans:
Neon
Explanation :
Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in high- voltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.
Explanation :
Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in high- voltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.