[1] An electric iron has a heating element made of –
A.
Copper
B.
Tungsten
C.
Nichrome
D.
Zinc
Ans:
Nichrome
Explanation :
Nichrome is used in electric iron because it has high resistance and it is stable in air when hot. Nichrome wire forms a protective layer of chromium oxide. Chemically it is quite stable and does not combine with other atmospheric gases even in high temperature.
[2] The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called –
A.
Zinc plating
B.
Alloy formation
C.
Vulcanization
D.
Galvanization
Ans:
Galvanization
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting.
[3] Which of the following is most important for absorption of heat radiated from the Sun as well as from the Earth?
A.
Carbon dioxide
B.
Oxygen
C.
Carbon monoxide
D.
Nitrogen
Ans:
Carbon dioxide
Explanation :
Carbon dioxide is a green house gas that absorbs heat radiated from the Sun as well as re-radiated heat from the Earth's surface.
[4] Philosopher’s wool is chemically -
A.
Aluminium oxide
B.
Magnesium oxide
C.
Zinc oxide
D.
Calcium oxide
Ans:
Zinc oxide
Explanation :
Philosopher's Wool is chemically zinc oxide.
[5] Charcoal is used in water treatment as a/an -
A.
absorbent
B.
coagulant
C.
solvent
D.
adsorbent
Ans:
adsorbent
Explanation :
Charcoal is used in water treatment as adsorbent.
[6] The chemical used for cloud seeding for artificial rains is -
A.
Silver Nitrate
B.
Potassium Bromide
C.
Silver Iodide
D.
Potassium Nitrate
Ans:
Silver Iodide
Explanation :
The chemical used for cloud seeding for artificial rains is silver iodide.
[7] Which among the following is liquid non-metal?
A.
Mercury
B.
Bromine
C.
Water
D.
Alcohol
Ans:
Bromine
Explanation :
Bromine, a non-metal of halogen group, is found in liquid state. Mercury is a metal. Water and alcohol are compounds
[8] The percentage of oxygen in air is approximately –
A.
1
B.
0.01
C.
0.78
D.
0.21
Ans:
0.21
Explanation :
Explanation: Composition of air Nitrogen : 78.08 percent Oxygen : 20.94 percent Argon : 0.93 percent Carbondioxdide : 0.03 percent Neon : 0.0018 percent Helium 0.0005 percent Ozone : 0.00006 percent Hydrogen : 0.00005 percent
[9] What is the second largest cornponent in milk?
A.
Fat
B.
Minerals
C.
Water
D.
Sugar
Ans:
Fat
Explanation :
Components of Milk : Water (87 percent), Carbohydrate (4.9 percent), Fat. (3.4 percent), Protein (3.3 percent), and so on
[10] Which of the following is NOT a primary green house gas in the earth's atmosphere?
A.
Methane
B.
Ozone
C.
Nitrous oxide
D.
Hydrogen
Ans:
Hydrogen
Explanation :
Greenhouse gases are those that absorb and emit infrared radiation in the wavelength range emitted by Earth.
[11] The presence of Cobalt in Vitamin B12 was established for the first time by –
A.
Hydrolysis test
B.
Spectroscopy
C.
Borax-Bead test
D.
Sodium Nitroprusside test
Ans:
Spectroscopy
Explanation :
Atomic absorption spectroscopy is an analytical chemistry technique used for determining concentration of particular metal element and is widely used in pharmaceutics. It was used for the determination of cobalt in Vitamin B12.
[12] Coating of solid waste with impervious material is known as –
A.
Encapsulation
B.
Chemical fixation
C.
Landfill
D.
Capping
Ans:
Encapsulation
Explanation :
Containment of toxic or hazardous constituents in industrial solid wastes is currently being accomplished using: (i) coating grains of waste material with an inert and non-reactive impervious material (microencapsulation), and (ii) coating blocks of waste material with an inert, non-reactive impervious material (macroencapsulation).
[13] Sweat contains water and .
A.
Citric acid
B.
Lactic acid
C.
Salt
D.
Vinegar
Ans:
Salt
Explanation :
Sweat contains mainly water. It also contains minerals, lactate, and urea. It also contains a smaller amount of sodium chloride (main component of ordinary table salt).
[14] How many bones are there in a newly born infant?
A.
206
B.
230
C.
280
D.
300
Ans:
280
Explanation :
At birth, there are over 270 bones in an infant body. But many of these fuse together as the child grows, leaving a total of 206 separate bones in a typical adult.
[15] White phosphorus is generally kept under –
A.
Alcohol
B.
Water
C.
Glycerine
D.
Kerosene oil
Ans:
Water
Explanation :
White phosphorous is kept under water because it reacts with oxygen but not water. Besides, it is insoluble in water. It presents a significant fire hazard due to its extreme reactivity with atmospheric oxygen.
[16] Which of the following acts as a resistance against disease in the body?
A.
Carbohydrates
B.
Red corpuscles
C.
Vitamins
D.
White corpuscles
Ans:
White corpuscles
Explanation :
White corpuscles or the White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.
[17] Which one of the following is the softest -
A.
sodium
B.
iron
C.
aluminium
D.
lithium
Ans:
sodium
Explanation :
Explanation: lightest-lithium, heaviest- osmium, hardest-tungsten, soft metal- sodium.
[18] Brass contains –
A.
Copper and Zinc
B.
Copper and Tin
C.
Copper and Silver
D.
Copper and Nickel
Ans:
Copper and Zinc
Explanation :
Brass is an alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By comparison, bronze is principally an alloy of copper and tin.
[19] Which is the purest commercial form of iron?
A.
Pig iron
B.
Steel
C.
Stainless steel
D.
Wrought iron
Ans:
Wrought iron
Explanation :
Wrought iron or malleable iron is the purest form of commercial iron as it contains the lowest percentage of carbon (0.12-0.25%) and impurities of S, P, Mn and Si in minute amount (about 0.3%). It is made by melting cast iron with scrap iron in a reverberatory furnace lined with Fe203 which oxidizes C, Si, P, etc, most of which are then removed by rolling.
[20] Which of the following particles has the dual nature of particle-wave?
A.
Electron
B.
Meson
C.
Proton
D.
Neutron
Ans:
Electron
Explanation :
In 1905, it was Einstein who suggested the concept of light having a dual nature; particle and wave nature. In a similar way, Louise de Broglie suggested that electron also exhibits a dual nature. Broglie derived a mathematical expression to prove the wave nature of electron along with particle nature. He gave the following relation:- ë =h/mí, where ë is the wavelength of electron, m is mass of an electron and í is the frequency.
[21] Ultra purification of a metal is done by –
A.
slugging
B.
zone melting
C.
smelting
D.
leaching
Ans:
zone melting
Explanation :
When metals are required in a ultra pure state, the zone refining method is used. The principle- employed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase.
[22] An antiknock for petrol is -
A.
sodium hydroxide
B.
ethanol
C.
sodium benzoate
D.
lead tetraethyl
Ans:
lead tetraethyl
Explanation :
The organic compound that is used as an antiknock agent in petroleum is tetraethyl lead. This is a lead based organic compound.
[23] The ratio of Pure gold and 18 carot gold is –
A.
0.6
B.
0.75
C.
0.8
D.
1
Ans:
0.75
Explanation :
24-karat gold is pure (while 100% purity is unattainable, this designation is permitted in commerce for 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold).
[24] Limestone is a raw material used by which industry?
A.
Aluminium
B.
Fertilizers
C.
Cement
D.
Petrochemicals
Ans:
Cement
Explanation :
Limestone is used as a raw-material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar. Clay and shale are also used as raw materials for the production of cement.
[25] Atomic number of an atom gives the number of which of the following?
A.
electrons
B.
protons
C.
neutrons
D.
neutrons and protons
Ans:
protons
Explanation :
Atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It determines the place of an element in the periodic table. In an uncharged atom, the atomic number is also equal to the number of electrons.
Explanation :
Nichrome is used in electric iron because it has high resistance and it is stable in air when hot. Nichrome wire forms a protective layer of chromium oxide. Chemically it is quite stable and does not combine with other atmospheric gases even in high temperature.
[2] The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called –
A.
Zinc plating
B.
Alloy formation
C.
Vulcanization
D.
Galvanization
Ans:
Galvanization
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting.
[3] Which of the following is most important for absorption of heat radiated from the Sun as well as from the Earth?
A.
Carbon dioxide
B.
Oxygen
C.
Carbon monoxide
D.
Nitrogen
Ans:
Carbon dioxide
Explanation :
Carbon dioxide is a green house gas that absorbs heat radiated from the Sun as well as re-radiated heat from the Earth's surface.
[4] Philosopher’s wool is chemically -
A.
Aluminium oxide
B.
Magnesium oxide
C.
Zinc oxide
D.
Calcium oxide
Ans:
Zinc oxide
Explanation :
Philosopher's Wool is chemically zinc oxide.
[5] Charcoal is used in water treatment as a/an -
A.
absorbent
B.
coagulant
C.
solvent
D.
adsorbent
Ans:
adsorbent
Explanation :
Charcoal is used in water treatment as adsorbent.
[6] The chemical used for cloud seeding for artificial rains is -
A.
Silver Nitrate
B.
Potassium Bromide
C.
Silver Iodide
D.
Potassium Nitrate
Ans:
Silver Iodide
Explanation :
The chemical used for cloud seeding for artificial rains is silver iodide.
[7] Which among the following is liquid non-metal?
A.
Mercury
B.
Bromine
C.
Water
D.
Alcohol
Ans:
Bromine
Explanation :
Bromine, a non-metal of halogen group, is found in liquid state. Mercury is a metal. Water and alcohol are compounds
[8] The percentage of oxygen in air is approximately –
A.
1
B.
0.01
C.
0.78
D.
0.21
Ans:
0.21
Explanation :
Explanation: Composition of air Nitrogen : 78.08 percent Oxygen : 20.94 percent Argon : 0.93 percent Carbondioxdide : 0.03 percent Neon : 0.0018 percent Helium 0.0005 percent Ozone : 0.00006 percent Hydrogen : 0.00005 percent
[9] What is the second largest cornponent in milk?
A.
Fat
B.
Minerals
C.
Water
D.
Sugar
Ans:
Fat
Explanation :
Components of Milk : Water (87 percent), Carbohydrate (4.9 percent), Fat. (3.4 percent), Protein (3.3 percent), and so on
[10] Which of the following is NOT a primary green house gas in the earth's atmosphere?
A.
Methane
B.
Ozone
C.
Nitrous oxide
D.
Hydrogen
Ans:
Hydrogen
Explanation :
Greenhouse gases are those that absorb and emit infrared radiation in the wavelength range emitted by Earth.
[11] The presence of Cobalt in Vitamin B12 was established for the first time by –
A.
Hydrolysis test
B.
Spectroscopy
C.
Borax-Bead test
D.
Sodium Nitroprusside test
Ans:
Spectroscopy
Explanation :
Atomic absorption spectroscopy is an analytical chemistry technique used for determining concentration of particular metal element and is widely used in pharmaceutics. It was used for the determination of cobalt in Vitamin B12.
[12] Coating of solid waste with impervious material is known as –
A.
Encapsulation
B.
Chemical fixation
C.
Landfill
D.
Capping
Ans:
Encapsulation
Explanation :
Containment of toxic or hazardous constituents in industrial solid wastes is currently being accomplished using: (i) coating grains of waste material with an inert and non-reactive impervious material (microencapsulation), and (ii) coating blocks of waste material with an inert, non-reactive impervious material (macroencapsulation).
[13] Sweat contains water and .
A.
Citric acid
B.
Lactic acid
C.
Salt
D.
Vinegar
Ans:
Salt
Explanation :
Sweat contains mainly water. It also contains minerals, lactate, and urea. It also contains a smaller amount of sodium chloride (main component of ordinary table salt).
[14] How many bones are there in a newly born infant?
A.
206
B.
230
C.
280
D.
300
Ans:
280
Explanation :
At birth, there are over 270 bones in an infant body. But many of these fuse together as the child grows, leaving a total of 206 separate bones in a typical adult.
[15] White phosphorus is generally kept under –
A.
Alcohol
B.
Water
C.
Glycerine
D.
Kerosene oil
Ans:
Water
Explanation :
White phosphorous is kept under water because it reacts with oxygen but not water. Besides, it is insoluble in water. It presents a significant fire hazard due to its extreme reactivity with atmospheric oxygen.
[16] Which of the following acts as a resistance against disease in the body?
A.
Carbohydrates
B.
Red corpuscles
C.
Vitamins
D.
White corpuscles
Ans:
White corpuscles
Explanation :
White corpuscles or the White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.
[17] Which one of the following is the softest -
A.
sodium
B.
iron
C.
aluminium
D.
lithium
Ans:
sodium
Explanation :
Explanation: lightest-lithium, heaviest- osmium, hardest-tungsten, soft metal- sodium.
[18] Brass contains –
A.
Copper and Zinc
B.
Copper and Tin
C.
Copper and Silver
D.
Copper and Nickel
Ans:
Copper and Zinc
Explanation :
Brass is an alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By comparison, bronze is principally an alloy of copper and tin.
[19] Which is the purest commercial form of iron?
A.
Pig iron
B.
Steel
C.
Stainless steel
D.
Wrought iron
Ans:
Wrought iron
Explanation :
Wrought iron or malleable iron is the purest form of commercial iron as it contains the lowest percentage of carbon (0.12-0.25%) and impurities of S, P, Mn and Si in minute amount (about 0.3%). It is made by melting cast iron with scrap iron in a reverberatory furnace lined with Fe203 which oxidizes C, Si, P, etc, most of which are then removed by rolling.
[20] Which of the following particles has the dual nature of particle-wave?
A.
Electron
B.
Meson
C.
Proton
D.
Neutron
Ans:
Electron
Explanation :
In 1905, it was Einstein who suggested the concept of light having a dual nature; particle and wave nature. In a similar way, Louise de Broglie suggested that electron also exhibits a dual nature. Broglie derived a mathematical expression to prove the wave nature of electron along with particle nature. He gave the following relation:- ë =h/mí, where ë is the wavelength of electron, m is mass of an electron and í is the frequency.
[21] Ultra purification of a metal is done by –
A.
slugging
B.
zone melting
C.
smelting
D.
leaching
Ans:
zone melting
Explanation :
When metals are required in a ultra pure state, the zone refining method is used. The principle- employed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase.
[22] An antiknock for petrol is -
A.
sodium hydroxide
B.
ethanol
C.
sodium benzoate
D.
lead tetraethyl
Ans:
lead tetraethyl
Explanation :
The organic compound that is used as an antiknock agent in petroleum is tetraethyl lead. This is a lead based organic compound.
[23] The ratio of Pure gold and 18 carot gold is –
A.
0.6
B.
0.75
C.
0.8
D.
1
Ans:
0.75
Explanation :
24-karat gold is pure (while 100% purity is unattainable, this designation is permitted in commerce for 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold).
[24] Limestone is a raw material used by which industry?
A.
Aluminium
B.
Fertilizers
C.
Cement
D.
Petrochemicals
Ans:
Cement
Explanation :
Limestone is used as a raw-material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar. Clay and shale are also used as raw materials for the production of cement.
[25] Atomic number of an atom gives the number of which of the following?
A.
electrons
B.
protons
C.
neutrons
D.
neutrons and protons
Ans:
protons
Explanation :
Atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It determines the place of an element in the periodic table. In an uncharged atom, the atomic number is also equal to the number of electrons.
Explanation :
Carbon dioxide is a green house gas that absorbs heat radiated from the Sun as well as re-radiated heat from the Earth's surface.
[4] Philosopher’s wool is chemically -
A.
Aluminium oxide
B.
Magnesium oxide
C.
Zinc oxide
D.
Calcium oxide
Ans:
Zinc oxide
Explanation :
Philosopher's Wool is chemically zinc oxide.
[5] Charcoal is used in water treatment as a/an -
A.
absorbent
B.
coagulant
C.
solvent
D.
adsorbent
Ans:
adsorbent
Explanation :
Charcoal is used in water treatment as adsorbent.
[6] The chemical used for cloud seeding for artificial rains is -
A.
Silver Nitrate
B.
Potassium Bromide
C.
Silver Iodide
D.
Potassium Nitrate
Ans:
Silver Iodide
Explanation :
The chemical used for cloud seeding for artificial rains is silver iodide.
[7] Which among the following is liquid non-metal?
A.
Mercury
B.
Bromine
C.
Water
D.
Alcohol
Ans:
Bromine
Explanation :
Bromine, a non-metal of halogen group, is found in liquid state. Mercury is a metal. Water and alcohol are compounds
[8] The percentage of oxygen in air is approximately –
A.
1
B.
0.01
C.
0.78
D.
0.21
Ans:
0.21
Explanation :
Explanation: Composition of air Nitrogen : 78.08 percent Oxygen : 20.94 percent Argon : 0.93 percent Carbondioxdide : 0.03 percent Neon : 0.0018 percent Helium 0.0005 percent Ozone : 0.00006 percent Hydrogen : 0.00005 percent
[9] What is the second largest cornponent in milk?
A.
Fat
B.
Minerals
C.
Water
D.
Sugar
Ans:
Fat
Explanation :
Components of Milk : Water (87 percent), Carbohydrate (4.9 percent), Fat. (3.4 percent), Protein (3.3 percent), and so on
[10] Which of the following is NOT a primary green house gas in the earth's atmosphere?
A.
Methane
B.
Ozone
C.
Nitrous oxide
D.
Hydrogen
Ans:
Hydrogen
Explanation :
Greenhouse gases are those that absorb and emit infrared radiation in the wavelength range emitted by Earth.
[11] The presence of Cobalt in Vitamin B12 was established for the first time by –
A.
Hydrolysis test
B.
Spectroscopy
C.
Borax-Bead test
D.
Sodium Nitroprusside test
Ans:
Spectroscopy
Explanation :
Atomic absorption spectroscopy is an analytical chemistry technique used for determining concentration of particular metal element and is widely used in pharmaceutics. It was used for the determination of cobalt in Vitamin B12.
[12] Coating of solid waste with impervious material is known as –
A.
Encapsulation
B.
Chemical fixation
C.
Landfill
D.
Capping
Ans:
Encapsulation
Explanation :
Containment of toxic or hazardous constituents in industrial solid wastes is currently being accomplished using: (i) coating grains of waste material with an inert and non-reactive impervious material (microencapsulation), and (ii) coating blocks of waste material with an inert, non-reactive impervious material (macroencapsulation).
[13] Sweat contains water and .
A.
Citric acid
B.
Lactic acid
C.
Salt
D.
Vinegar
Ans:
Salt
Explanation :
Sweat contains mainly water. It also contains minerals, lactate, and urea. It also contains a smaller amount of sodium chloride (main component of ordinary table salt).
[14] How many bones are there in a newly born infant?
A.
206
B.
230
C.
280
D.
300
Ans:
280
Explanation :
At birth, there are over 270 bones in an infant body. But many of these fuse together as the child grows, leaving a total of 206 separate bones in a typical adult.
[15] White phosphorus is generally kept under –
A.
Alcohol
B.
Water
C.
Glycerine
D.
Kerosene oil
Ans:
Water
Explanation :
White phosphorous is kept under water because it reacts with oxygen but not water. Besides, it is insoluble in water. It presents a significant fire hazard due to its extreme reactivity with atmospheric oxygen.
[16] Which of the following acts as a resistance against disease in the body?
A.
Carbohydrates
B.
Red corpuscles
C.
Vitamins
D.
White corpuscles
Ans:
White corpuscles
Explanation :
White corpuscles or the White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.
[17] Which one of the following is the softest -
A.
sodium
B.
iron
C.
aluminium
D.
lithium
Ans:
sodium
Explanation :
Explanation: lightest-lithium, heaviest- osmium, hardest-tungsten, soft metal- sodium.
[18] Brass contains –
A.
Copper and Zinc
B.
Copper and Tin
C.
Copper and Silver
D.
Copper and Nickel
Ans:
Copper and Zinc
Explanation :
Brass is an alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By comparison, bronze is principally an alloy of copper and tin.
[19] Which is the purest commercial form of iron?
A.
Pig iron
B.
Steel
C.
Stainless steel
D.
Wrought iron
Ans:
Wrought iron
Explanation :
Wrought iron or malleable iron is the purest form of commercial iron as it contains the lowest percentage of carbon (0.12-0.25%) and impurities of S, P, Mn and Si in minute amount (about 0.3%). It is made by melting cast iron with scrap iron in a reverberatory furnace lined with Fe203 which oxidizes C, Si, P, etc, most of which are then removed by rolling.
[20] Which of the following particles has the dual nature of particle-wave?
A.
Electron
B.
Meson
C.
Proton
D.
Neutron
Ans:
Electron
Explanation :
In 1905, it was Einstein who suggested the concept of light having a dual nature; particle and wave nature. In a similar way, Louise de Broglie suggested that electron also exhibits a dual nature. Broglie derived a mathematical expression to prove the wave nature of electron along with particle nature. He gave the following relation:- ë =h/mí, where ë is the wavelength of electron, m is mass of an electron and í is the frequency.
[21] Ultra purification of a metal is done by –
A.
slugging
B.
zone melting
C.
smelting
D.
leaching
Ans:
zone melting
Explanation :
When metals are required in a ultra pure state, the zone refining method is used. The principle- employed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase.
[22] An antiknock for petrol is -
A.
sodium hydroxide
B.
ethanol
C.
sodium benzoate
D.
lead tetraethyl
Ans:
lead tetraethyl
Explanation :
The organic compound that is used as an antiknock agent in petroleum is tetraethyl lead. This is a lead based organic compound.
[23] The ratio of Pure gold and 18 carot gold is –
A.
0.6
B.
0.75
C.
0.8
D.
1
Ans:
0.75
Explanation :
24-karat gold is pure (while 100% purity is unattainable, this designation is permitted in commerce for 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold).
[24] Limestone is a raw material used by which industry?
A.
Aluminium
B.
Fertilizers
C.
Cement
D.
Petrochemicals
Ans:
Cement
Explanation :
Limestone is used as a raw-material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar. Clay and shale are also used as raw materials for the production of cement.
[25] Atomic number of an atom gives the number of which of the following?
A.
electrons
B.
protons
C.
neutrons
D.
neutrons and protons
Ans:
protons
Explanation :
Atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It determines the place of an element in the periodic table. In an uncharged atom, the atomic number is also equal to the number of electrons.
Explanation :
Charcoal is used in water treatment as adsorbent.
[6] The chemical used for cloud seeding for artificial rains is -
A.
Silver Nitrate
B.
Potassium Bromide
C.
Silver Iodide
D.
Potassium Nitrate
Ans:
Silver Iodide
Explanation :
The chemical used for cloud seeding for artificial rains is silver iodide.
[7] Which among the following is liquid non-metal?
A.
Mercury
B.
Bromine
C.
Water
D.
Alcohol
Ans:
Bromine
Explanation :
Bromine, a non-metal of halogen group, is found in liquid state. Mercury is a metal. Water and alcohol are compounds
[8] The percentage of oxygen in air is approximately –
A.
1
B.
0.01
C.
0.78
D.
0.21
Ans:
0.21
Explanation :
Explanation: Composition of air Nitrogen : 78.08 percent Oxygen : 20.94 percent Argon : 0.93 percent Carbondioxdide : 0.03 percent Neon : 0.0018 percent Helium 0.0005 percent Ozone : 0.00006 percent Hydrogen : 0.00005 percent
[9] What is the second largest cornponent in milk?
A.
Fat
B.
Minerals
C.
Water
D.
Sugar
Ans:
Fat
Explanation :
Components of Milk : Water (87 percent), Carbohydrate (4.9 percent), Fat. (3.4 percent), Protein (3.3 percent), and so on
[10] Which of the following is NOT a primary green house gas in the earth's atmosphere?
A.
Methane
B.
Ozone
C.
Nitrous oxide
D.
Hydrogen
Ans:
Hydrogen
Explanation :
Greenhouse gases are those that absorb and emit infrared radiation in the wavelength range emitted by Earth.
[11] The presence of Cobalt in Vitamin B12 was established for the first time by –
A.
Hydrolysis test
B.
Spectroscopy
C.
Borax-Bead test
D.
Sodium Nitroprusside test
Ans:
Spectroscopy
Explanation :
Atomic absorption spectroscopy is an analytical chemistry technique used for determining concentration of particular metal element and is widely used in pharmaceutics. It was used for the determination of cobalt in Vitamin B12.
[12] Coating of solid waste with impervious material is known as –
A.
Encapsulation
B.
Chemical fixation
C.
Landfill
D.
Capping
Ans:
Encapsulation
Explanation :
Containment of toxic or hazardous constituents in industrial solid wastes is currently being accomplished using: (i) coating grains of waste material with an inert and non-reactive impervious material (microencapsulation), and (ii) coating blocks of waste material with an inert, non-reactive impervious material (macroencapsulation).
[13] Sweat contains water and .
A.
Citric acid
B.
Lactic acid
C.
Salt
D.
Vinegar
Ans:
Salt
Explanation :
Sweat contains mainly water. It also contains minerals, lactate, and urea. It also contains a smaller amount of sodium chloride (main component of ordinary table salt).
[14] How many bones are there in a newly born infant?
A.
206
B.
230
C.
280
D.
300
Ans:
280
Explanation :
At birth, there are over 270 bones in an infant body. But many of these fuse together as the child grows, leaving a total of 206 separate bones in a typical adult.
[15] White phosphorus is generally kept under –
A.
Alcohol
B.
Water
C.
Glycerine
D.
Kerosene oil
Ans:
Water
Explanation :
White phosphorous is kept under water because it reacts with oxygen but not water. Besides, it is insoluble in water. It presents a significant fire hazard due to its extreme reactivity with atmospheric oxygen.
[16] Which of the following acts as a resistance against disease in the body?
A.
Carbohydrates
B.
Red corpuscles
C.
Vitamins
D.
White corpuscles
Ans:
White corpuscles
Explanation :
White corpuscles or the White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.
[17] Which one of the following is the softest -
A.
sodium
B.
iron
C.
aluminium
D.
lithium
Ans:
sodium
Explanation :
Explanation: lightest-lithium, heaviest- osmium, hardest-tungsten, soft metal- sodium.
[18] Brass contains –
A.
Copper and Zinc
B.
Copper and Tin
C.
Copper and Silver
D.
Copper and Nickel
Ans:
Copper and Zinc
Explanation :
Brass is an alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By comparison, bronze is principally an alloy of copper and tin.
[19] Which is the purest commercial form of iron?
A.
Pig iron
B.
Steel
C.
Stainless steel
D.
Wrought iron
Ans:
Wrought iron
Explanation :
Wrought iron or malleable iron is the purest form of commercial iron as it contains the lowest percentage of carbon (0.12-0.25%) and impurities of S, P, Mn and Si in minute amount (about 0.3%). It is made by melting cast iron with scrap iron in a reverberatory furnace lined with Fe203 which oxidizes C, Si, P, etc, most of which are then removed by rolling.
[20] Which of the following particles has the dual nature of particle-wave?
A.
Electron
B.
Meson
C.
Proton
D.
Neutron
Ans:
Electron
Explanation :
In 1905, it was Einstein who suggested the concept of light having a dual nature; particle and wave nature. In a similar way, Louise de Broglie suggested that electron also exhibits a dual nature. Broglie derived a mathematical expression to prove the wave nature of electron along with particle nature. He gave the following relation:- ë =h/mí, where ë is the wavelength of electron, m is mass of an electron and í is the frequency.
[21] Ultra purification of a metal is done by –
A.
slugging
B.
zone melting
C.
smelting
D.
leaching
Ans:
zone melting
Explanation :
When metals are required in a ultra pure state, the zone refining method is used. The principle- employed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase.
[22] An antiknock for petrol is -
A.
sodium hydroxide
B.
ethanol
C.
sodium benzoate
D.
lead tetraethyl
Ans:
lead tetraethyl
Explanation :
The organic compound that is used as an antiknock agent in petroleum is tetraethyl lead. This is a lead based organic compound.
[23] The ratio of Pure gold and 18 carot gold is –
A.
0.6
B.
0.75
C.
0.8
D.
1
Ans:
0.75
Explanation :
24-karat gold is pure (while 100% purity is unattainable, this designation is permitted in commerce for 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold).
[24] Limestone is a raw material used by which industry?
A.
Aluminium
B.
Fertilizers
C.
Cement
D.
Petrochemicals
Ans:
Cement
Explanation :
Limestone is used as a raw-material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar. Clay and shale are also used as raw materials for the production of cement.
[25] Atomic number of an atom gives the number of which of the following?
A.
electrons
B.
protons
C.
neutrons
D.
neutrons and protons
Ans:
protons
Explanation :
Atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It determines the place of an element in the periodic table. In an uncharged atom, the atomic number is also equal to the number of electrons.
Explanation :
Bromine, a non-metal of halogen group, is found in liquid state. Mercury is a metal. Water and alcohol are compounds
[8] The percentage of oxygen in air is approximately –
A.
1
B.
0.01
C.
0.78
D.
0.21
Ans:
0.21
Explanation :
Explanation: Composition of air Nitrogen : 78.08 percent Oxygen : 20.94 percent Argon : 0.93 percent Carbondioxdide : 0.03 percent Neon : 0.0018 percent Helium 0.0005 percent Ozone : 0.00006 percent Hydrogen : 0.00005 percent
[9] What is the second largest cornponent in milk?
A.
Fat
B.
Minerals
C.
Water
D.
Sugar
Ans:
Fat
Explanation :
Components of Milk : Water (87 percent), Carbohydrate (4.9 percent), Fat. (3.4 percent), Protein (3.3 percent), and so on
[10] Which of the following is NOT a primary green house gas in the earth's atmosphere?
A.
Methane
B.
Ozone
C.
Nitrous oxide
D.
Hydrogen
Ans:
Hydrogen
Explanation :
Greenhouse gases are those that absorb and emit infrared radiation in the wavelength range emitted by Earth.
[11] The presence of Cobalt in Vitamin B12 was established for the first time by –
A.
Hydrolysis test
B.
Spectroscopy
C.
Borax-Bead test
D.
Sodium Nitroprusside test
Ans:
Spectroscopy
Explanation :
Atomic absorption spectroscopy is an analytical chemistry technique used for determining concentration of particular metal element and is widely used in pharmaceutics. It was used for the determination of cobalt in Vitamin B12.
[12] Coating of solid waste with impervious material is known as –
A.
Encapsulation
B.
Chemical fixation
C.
Landfill
D.
Capping
Ans:
Encapsulation
Explanation :
Containment of toxic or hazardous constituents in industrial solid wastes is currently being accomplished using: (i) coating grains of waste material with an inert and non-reactive impervious material (microencapsulation), and (ii) coating blocks of waste material with an inert, non-reactive impervious material (macroencapsulation).
[13] Sweat contains water and .
A.
Citric acid
B.
Lactic acid
C.
Salt
D.
Vinegar
Ans:
Salt
Explanation :
Sweat contains mainly water. It also contains minerals, lactate, and urea. It also contains a smaller amount of sodium chloride (main component of ordinary table salt).
[14] How many bones are there in a newly born infant?
A.
206
B.
230
C.
280
D.
300
Ans:
280
Explanation :
At birth, there are over 270 bones in an infant body. But many of these fuse together as the child grows, leaving a total of 206 separate bones in a typical adult.
[15] White phosphorus is generally kept under –
A.
Alcohol
B.
Water
C.
Glycerine
D.
Kerosene oil
Ans:
Water
Explanation :
White phosphorous is kept under water because it reacts with oxygen but not water. Besides, it is insoluble in water. It presents a significant fire hazard due to its extreme reactivity with atmospheric oxygen.
[16] Which of the following acts as a resistance against disease in the body?
A.
Carbohydrates
B.
Red corpuscles
C.
Vitamins
D.
White corpuscles
Ans:
White corpuscles
Explanation :
White corpuscles or the White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.
[17] Which one of the following is the softest -
A.
sodium
B.
iron
C.
aluminium
D.
lithium
Ans:
sodium
Explanation :
Explanation: lightest-lithium, heaviest- osmium, hardest-tungsten, soft metal- sodium.
[18] Brass contains –
A.
Copper and Zinc
B.
Copper and Tin
C.
Copper and Silver
D.
Copper and Nickel
Ans:
Copper and Zinc
Explanation :
Brass is an alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By comparison, bronze is principally an alloy of copper and tin.
[19] Which is the purest commercial form of iron?
A.
Pig iron
B.
Steel
C.
Stainless steel
D.
Wrought iron
Ans:
Wrought iron
Explanation :
Wrought iron or malleable iron is the purest form of commercial iron as it contains the lowest percentage of carbon (0.12-0.25%) and impurities of S, P, Mn and Si in minute amount (about 0.3%). It is made by melting cast iron with scrap iron in a reverberatory furnace lined with Fe203 which oxidizes C, Si, P, etc, most of which are then removed by rolling.
[20] Which of the following particles has the dual nature of particle-wave?
A.
Electron
B.
Meson
C.
Proton
D.
Neutron
Ans:
Electron
Explanation :
In 1905, it was Einstein who suggested the concept of light having a dual nature; particle and wave nature. In a similar way, Louise de Broglie suggested that electron also exhibits a dual nature. Broglie derived a mathematical expression to prove the wave nature of electron along with particle nature. He gave the following relation:- ë =h/mí, where ë is the wavelength of electron, m is mass of an electron and í is the frequency.
[21] Ultra purification of a metal is done by –
A.
slugging
B.
zone melting
C.
smelting
D.
leaching
Ans:
zone melting
Explanation :
When metals are required in a ultra pure state, the zone refining method is used. The principle- employed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase.
[22] An antiknock for petrol is -
A.
sodium hydroxide
B.
ethanol
C.
sodium benzoate
D.
lead tetraethyl
Ans:
lead tetraethyl
Explanation :
The organic compound that is used as an antiknock agent in petroleum is tetraethyl lead. This is a lead based organic compound.
[23] The ratio of Pure gold and 18 carot gold is –
A.
0.6
B.
0.75
C.
0.8
D.
1
Ans:
0.75
Explanation :
24-karat gold is pure (while 100% purity is unattainable, this designation is permitted in commerce for 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold).
[24] Limestone is a raw material used by which industry?
A.
Aluminium
B.
Fertilizers
C.
Cement
D.
Petrochemicals
Ans:
Cement
Explanation :
Limestone is used as a raw-material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar. Clay and shale are also used as raw materials for the production of cement.
[25] Atomic number of an atom gives the number of which of the following?
A.
electrons
B.
protons
C.
neutrons
D.
neutrons and protons
Ans:
protons
Explanation :
Atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It determines the place of an element in the periodic table. In an uncharged atom, the atomic number is also equal to the number of electrons.
Explanation :
Components of Milk : Water (87 percent), Carbohydrate (4.9 percent), Fat. (3.4 percent), Protein (3.3 percent), and so on
[10] Which of the following is NOT a primary green house gas in the earth's atmosphere?
A.
Methane
B.
Ozone
C.
Nitrous oxide
D.
Hydrogen
Ans:
Hydrogen
Explanation :
Greenhouse gases are those that absorb and emit infrared radiation in the wavelength range emitted by Earth.
[11] The presence of Cobalt in Vitamin B12 was established for the first time by –
A.
Hydrolysis test
B.
Spectroscopy
C.
Borax-Bead test
D.
Sodium Nitroprusside test
Ans:
Spectroscopy
Explanation :
Atomic absorption spectroscopy is an analytical chemistry technique used for determining concentration of particular metal element and is widely used in pharmaceutics. It was used for the determination of cobalt in Vitamin B12.
[12] Coating of solid waste with impervious material is known as –
A.
Encapsulation
B.
Chemical fixation
C.
Landfill
D.
Capping
Ans:
Encapsulation
Explanation :
Containment of toxic or hazardous constituents in industrial solid wastes is currently being accomplished using: (i) coating grains of waste material with an inert and non-reactive impervious material (microencapsulation), and (ii) coating blocks of waste material with an inert, non-reactive impervious material (macroencapsulation).
[13] Sweat contains water and .
A.
Citric acid
B.
Lactic acid
C.
Salt
D.
Vinegar
Ans:
Salt
Explanation :
Sweat contains mainly water. It also contains minerals, lactate, and urea. It also contains a smaller amount of sodium chloride (main component of ordinary table salt).
[14] How many bones are there in a newly born infant?
A.
206
B.
230
C.
280
D.
300
Ans:
280
Explanation :
At birth, there are over 270 bones in an infant body. But many of these fuse together as the child grows, leaving a total of 206 separate bones in a typical adult.
[15] White phosphorus is generally kept under –
A.
Alcohol
B.
Water
C.
Glycerine
D.
Kerosene oil
Ans:
Water
Explanation :
White phosphorous is kept under water because it reacts with oxygen but not water. Besides, it is insoluble in water. It presents a significant fire hazard due to its extreme reactivity with atmospheric oxygen.
[16] Which of the following acts as a resistance against disease in the body?
A.
Carbohydrates
B.
Red corpuscles
C.
Vitamins
D.
White corpuscles
Ans:
White corpuscles
Explanation :
White corpuscles or the White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.
[17] Which one of the following is the softest -
A.
sodium
B.
iron
C.
aluminium
D.
lithium
Ans:
sodium
Explanation :
Explanation: lightest-lithium, heaviest- osmium, hardest-tungsten, soft metal- sodium.
[18] Brass contains –
A.
Copper and Zinc
B.
Copper and Tin
C.
Copper and Silver
D.
Copper and Nickel
Ans:
Copper and Zinc
Explanation :
Brass is an alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By comparison, bronze is principally an alloy of copper and tin.
[19] Which is the purest commercial form of iron?
A.
Pig iron
B.
Steel
C.
Stainless steel
D.
Wrought iron
Ans:
Wrought iron
Explanation :
Wrought iron or malleable iron is the purest form of commercial iron as it contains the lowest percentage of carbon (0.12-0.25%) and impurities of S, P, Mn and Si in minute amount (about 0.3%). It is made by melting cast iron with scrap iron in a reverberatory furnace lined with Fe203 which oxidizes C, Si, P, etc, most of which are then removed by rolling.
[20] Which of the following particles has the dual nature of particle-wave?
A.
Electron
B.
Meson
C.
Proton
D.
Neutron
Ans:
Electron
Explanation :
In 1905, it was Einstein who suggested the concept of light having a dual nature; particle and wave nature. In a similar way, Louise de Broglie suggested that electron also exhibits a dual nature. Broglie derived a mathematical expression to prove the wave nature of electron along with particle nature. He gave the following relation:- ë =h/mí, where ë is the wavelength of electron, m is mass of an electron and í is the frequency.
[21] Ultra purification of a metal is done by –
A.
slugging
B.
zone melting
C.
smelting
D.
leaching
Ans:
zone melting
Explanation :
When metals are required in a ultra pure state, the zone refining method is used. The principle- employed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase.
[22] An antiknock for petrol is -
A.
sodium hydroxide
B.
ethanol
C.
sodium benzoate
D.
lead tetraethyl
Ans:
lead tetraethyl
Explanation :
The organic compound that is used as an antiknock agent in petroleum is tetraethyl lead. This is a lead based organic compound.
[23] The ratio of Pure gold and 18 carot gold is –
A.
0.6
B.
0.75
C.
0.8
D.
1
Ans:
0.75
Explanation :
24-karat gold is pure (while 100% purity is unattainable, this designation is permitted in commerce for 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold).
[24] Limestone is a raw material used by which industry?
A.
Aluminium
B.
Fertilizers
C.
Cement
D.
Petrochemicals
Ans:
Cement
Explanation :
Limestone is used as a raw-material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar. Clay and shale are also used as raw materials for the production of cement.
[25] Atomic number of an atom gives the number of which of the following?
A.
electrons
B.
protons
C.
neutrons
D.
neutrons and protons
Ans:
protons
Explanation :
Atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It determines the place of an element in the periodic table. In an uncharged atom, the atomic number is also equal to the number of electrons.
Explanation :
Atomic absorption spectroscopy is an analytical chemistry technique used for determining concentration of particular metal element and is widely used in pharmaceutics. It was used for the determination of cobalt in Vitamin B12.
[12] Coating of solid waste with impervious material is known as –
A.
Encapsulation
B.
Chemical fixation
C.
Landfill
D.
Capping
Ans:
Encapsulation
Explanation :
Containment of toxic or hazardous constituents in industrial solid wastes is currently being accomplished using: (i) coating grains of waste material with an inert and non-reactive impervious material (microencapsulation), and (ii) coating blocks of waste material with an inert, non-reactive impervious material (macroencapsulation).
[13] Sweat contains water and .
A.
Citric acid
B.
Lactic acid
C.
Salt
D.
Vinegar
Ans:
Salt
Explanation :
Sweat contains mainly water. It also contains minerals, lactate, and urea. It also contains a smaller amount of sodium chloride (main component of ordinary table salt).
[14] How many bones are there in a newly born infant?
A.
206
B.
230
C.
280
D.
300
Ans:
280
Explanation :
At birth, there are over 270 bones in an infant body. But many of these fuse together as the child grows, leaving a total of 206 separate bones in a typical adult.
[15] White phosphorus is generally kept under –
A.
Alcohol
B.
Water
C.
Glycerine
D.
Kerosene oil
Ans:
Water
Explanation :
White phosphorous is kept under water because it reacts with oxygen but not water. Besides, it is insoluble in water. It presents a significant fire hazard due to its extreme reactivity with atmospheric oxygen.
[16] Which of the following acts as a resistance against disease in the body?
A.
Carbohydrates
B.
Red corpuscles
C.
Vitamins
D.
White corpuscles
Ans:
White corpuscles
Explanation :
White corpuscles or the White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.
[17] Which one of the following is the softest -
A.
sodium
B.
iron
C.
aluminium
D.
lithium
Ans:
sodium
Explanation :
Explanation: lightest-lithium, heaviest- osmium, hardest-tungsten, soft metal- sodium.
[18] Brass contains –
A.
Copper and Zinc
B.
Copper and Tin
C.
Copper and Silver
D.
Copper and Nickel
Ans:
Copper and Zinc
Explanation :
Brass is an alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By comparison, bronze is principally an alloy of copper and tin.
[19] Which is the purest commercial form of iron?
A.
Pig iron
B.
Steel
C.
Stainless steel
D.
Wrought iron
Ans:
Wrought iron
Explanation :
Wrought iron or malleable iron is the purest form of commercial iron as it contains the lowest percentage of carbon (0.12-0.25%) and impurities of S, P, Mn and Si in minute amount (about 0.3%). It is made by melting cast iron with scrap iron in a reverberatory furnace lined with Fe203 which oxidizes C, Si, P, etc, most of which are then removed by rolling.
[20] Which of the following particles has the dual nature of particle-wave?
A.
Electron
B.
Meson
C.
Proton
D.
Neutron
Ans:
Electron
Explanation :
In 1905, it was Einstein who suggested the concept of light having a dual nature; particle and wave nature. In a similar way, Louise de Broglie suggested that electron also exhibits a dual nature. Broglie derived a mathematical expression to prove the wave nature of electron along with particle nature. He gave the following relation:- ë =h/mí, where ë is the wavelength of electron, m is mass of an electron and í is the frequency.
[21] Ultra purification of a metal is done by –
A.
slugging
B.
zone melting
C.
smelting
D.
leaching
Ans:
zone melting
Explanation :
When metals are required in a ultra pure state, the zone refining method is used. The principle- employed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase.
[22] An antiknock for petrol is -
A.
sodium hydroxide
B.
ethanol
C.
sodium benzoate
D.
lead tetraethyl
Ans:
lead tetraethyl
Explanation :
The organic compound that is used as an antiknock agent in petroleum is tetraethyl lead. This is a lead based organic compound.
[23] The ratio of Pure gold and 18 carot gold is –
A.
0.6
B.
0.75
C.
0.8
D.
1
Ans:
0.75
Explanation :
24-karat gold is pure (while 100% purity is unattainable, this designation is permitted in commerce for 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold).
[24] Limestone is a raw material used by which industry?
A.
Aluminium
B.
Fertilizers
C.
Cement
D.
Petrochemicals
Ans:
Cement
Explanation :
Limestone is used as a raw-material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar. Clay and shale are also used as raw materials for the production of cement.
[25] Atomic number of an atom gives the number of which of the following?
A.
electrons
B.
protons
C.
neutrons
D.
neutrons and protons
Ans:
protons
Explanation :
Atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It determines the place of an element in the periodic table. In an uncharged atom, the atomic number is also equal to the number of electrons.
Explanation :
Sweat contains mainly water. It also contains minerals, lactate, and urea. It also contains a smaller amount of sodium chloride (main component of ordinary table salt).
[14] How many bones are there in a newly born infant?
A.
206
B.
230
C.
280
D.
300
Ans:
280
Explanation :
At birth, there are over 270 bones in an infant body. But many of these fuse together as the child grows, leaving a total of 206 separate bones in a typical adult.
[15] White phosphorus is generally kept under –
A.
Alcohol
B.
Water
C.
Glycerine
D.
Kerosene oil
Ans:
Water
Explanation :
White phosphorous is kept under water because it reacts with oxygen but not water. Besides, it is insoluble in water. It presents a significant fire hazard due to its extreme reactivity with atmospheric oxygen.
[16] Which of the following acts as a resistance against disease in the body?
A.
Carbohydrates
B.
Red corpuscles
C.
Vitamins
D.
White corpuscles
Ans:
White corpuscles
Explanation :
White corpuscles or the White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.
[17] Which one of the following is the softest -
A.
sodium
B.
iron
C.
aluminium
D.
lithium
Ans:
sodium
Explanation :
Explanation: lightest-lithium, heaviest- osmium, hardest-tungsten, soft metal- sodium.
[18] Brass contains –
A.
Copper and Zinc
B.
Copper and Tin
C.
Copper and Silver
D.
Copper and Nickel
Ans:
Copper and Zinc
Explanation :
Brass is an alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By comparison, bronze is principally an alloy of copper and tin.
[19] Which is the purest commercial form of iron?
A.
Pig iron
B.
Steel
C.
Stainless steel
D.
Wrought iron
Ans:
Wrought iron
Explanation :
Wrought iron or malleable iron is the purest form of commercial iron as it contains the lowest percentage of carbon (0.12-0.25%) and impurities of S, P, Mn and Si in minute amount (about 0.3%). It is made by melting cast iron with scrap iron in a reverberatory furnace lined with Fe203 which oxidizes C, Si, P, etc, most of which are then removed by rolling.
[20] Which of the following particles has the dual nature of particle-wave?
A.
Electron
B.
Meson
C.
Proton
D.
Neutron
Ans:
Electron
Explanation :
In 1905, it was Einstein who suggested the concept of light having a dual nature; particle and wave nature. In a similar way, Louise de Broglie suggested that electron also exhibits a dual nature. Broglie derived a mathematical expression to prove the wave nature of electron along with particle nature. He gave the following relation:- ë =h/mí, where ë is the wavelength of electron, m is mass of an electron and í is the frequency.
[21] Ultra purification of a metal is done by –
A.
slugging
B.
zone melting
C.
smelting
D.
leaching
Ans:
zone melting
Explanation :
When metals are required in a ultra pure state, the zone refining method is used. The principle- employed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase.
[22] An antiknock for petrol is -
A.
sodium hydroxide
B.
ethanol
C.
sodium benzoate
D.
lead tetraethyl
Ans:
lead tetraethyl
Explanation :
The organic compound that is used as an antiknock agent in petroleum is tetraethyl lead. This is a lead based organic compound.
[23] The ratio of Pure gold and 18 carot gold is –
A.
0.6
B.
0.75
C.
0.8
D.
1
Ans:
0.75
Explanation :
24-karat gold is pure (while 100% purity is unattainable, this designation is permitted in commerce for 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold).
[24] Limestone is a raw material used by which industry?
A.
Aluminium
B.
Fertilizers
C.
Cement
D.
Petrochemicals
Ans:
Cement
Explanation :
Limestone is used as a raw-material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar. Clay and shale are also used as raw materials for the production of cement.
[25] Atomic number of an atom gives the number of which of the following?
A.
electrons
B.
protons
C.
neutrons
D.
neutrons and protons
Ans:
protons
Explanation :
Atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It determines the place of an element in the periodic table. In an uncharged atom, the atomic number is also equal to the number of electrons.
Explanation :
White phosphorous is kept under water because it reacts with oxygen but not water. Besides, it is insoluble in water. It presents a significant fire hazard due to its extreme reactivity with atmospheric oxygen.
[16] Which of the following acts as a resistance against disease in the body?
A.
Carbohydrates
B.
Red corpuscles
C.
Vitamins
D.
White corpuscles
Ans:
White corpuscles
Explanation :
White corpuscles or the White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.
[17] Which one of the following is the softest -
A.
sodium
B.
iron
C.
aluminium
D.
lithium
Ans:
sodium
Explanation :
Explanation: lightest-lithium, heaviest- osmium, hardest-tungsten, soft metal- sodium.
[18] Brass contains –
A.
Copper and Zinc
B.
Copper and Tin
C.
Copper and Silver
D.
Copper and Nickel
Ans:
Copper and Zinc
Explanation :
Brass is an alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By comparison, bronze is principally an alloy of copper and tin.
[19] Which is the purest commercial form of iron?
A.
Pig iron
B.
Steel
C.
Stainless steel
D.
Wrought iron
Ans:
Wrought iron
Explanation :
Wrought iron or malleable iron is the purest form of commercial iron as it contains the lowest percentage of carbon (0.12-0.25%) and impurities of S, P, Mn and Si in minute amount (about 0.3%). It is made by melting cast iron with scrap iron in a reverberatory furnace lined with Fe203 which oxidizes C, Si, P, etc, most of which are then removed by rolling.
[20] Which of the following particles has the dual nature of particle-wave?
A.
Electron
B.
Meson
C.
Proton
D.
Neutron
Ans:
Electron
Explanation :
In 1905, it was Einstein who suggested the concept of light having a dual nature; particle and wave nature. In a similar way, Louise de Broglie suggested that electron also exhibits a dual nature. Broglie derived a mathematical expression to prove the wave nature of electron along with particle nature. He gave the following relation:- ë =h/mí, where ë is the wavelength of electron, m is mass of an electron and í is the frequency.
[21] Ultra purification of a metal is done by –
A.
slugging
B.
zone melting
C.
smelting
D.
leaching
Ans:
zone melting
Explanation :
When metals are required in a ultra pure state, the zone refining method is used. The principle- employed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase.
[22] An antiknock for petrol is -
A.
sodium hydroxide
B.
ethanol
C.
sodium benzoate
D.
lead tetraethyl
Ans:
lead tetraethyl
Explanation :
The organic compound that is used as an antiknock agent in petroleum is tetraethyl lead. This is a lead based organic compound.
[23] The ratio of Pure gold and 18 carot gold is –
A.
0.6
B.
0.75
C.
0.8
D.
1
Ans:
0.75
Explanation :
24-karat gold is pure (while 100% purity is unattainable, this designation is permitted in commerce for 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold).
[24] Limestone is a raw material used by which industry?
A.
Aluminium
B.
Fertilizers
C.
Cement
D.
Petrochemicals
Ans:
Cement
Explanation :
Limestone is used as a raw-material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar. Clay and shale are also used as raw materials for the production of cement.
[25] Atomic number of an atom gives the number of which of the following?
A.
electrons
B.
protons
C.
neutrons
D.
neutrons and protons
Ans:
protons
Explanation :
Atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It determines the place of an element in the periodic table. In an uncharged atom, the atomic number is also equal to the number of electrons.
Explanation :
Explanation: lightest-lithium, heaviest- osmium, hardest-tungsten, soft metal- sodium.
[18] Brass contains –
A.
Copper and Zinc
B.
Copper and Tin
C.
Copper and Silver
D.
Copper and Nickel
Ans:
Copper and Zinc
Explanation :
Brass is an alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By comparison, bronze is principally an alloy of copper and tin.
[19] Which is the purest commercial form of iron?
A.
Pig iron
B.
Steel
C.
Stainless steel
D.
Wrought iron
Ans:
Wrought iron
Explanation :
Wrought iron or malleable iron is the purest form of commercial iron as it contains the lowest percentage of carbon (0.12-0.25%) and impurities of S, P, Mn and Si in minute amount (about 0.3%). It is made by melting cast iron with scrap iron in a reverberatory furnace lined with Fe203 which oxidizes C, Si, P, etc, most of which are then removed by rolling.
[20] Which of the following particles has the dual nature of particle-wave?
A.
Electron
B.
Meson
C.
Proton
D.
Neutron
Ans:
Electron
Explanation :
In 1905, it was Einstein who suggested the concept of light having a dual nature; particle and wave nature. In a similar way, Louise de Broglie suggested that electron also exhibits a dual nature. Broglie derived a mathematical expression to prove the wave nature of electron along with particle nature. He gave the following relation:- ë =h/mí, where ë is the wavelength of electron, m is mass of an electron and í is the frequency.
[21] Ultra purification of a metal is done by –
A.
slugging
B.
zone melting
C.
smelting
D.
leaching
Ans:
zone melting
Explanation :
When metals are required in a ultra pure state, the zone refining method is used. The principle- employed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase.
[22] An antiknock for petrol is -
A.
sodium hydroxide
B.
ethanol
C.
sodium benzoate
D.
lead tetraethyl
Ans:
lead tetraethyl
Explanation :
The organic compound that is used as an antiknock agent in petroleum is tetraethyl lead. This is a lead based organic compound.
[23] The ratio of Pure gold and 18 carot gold is –
A.
0.6
B.
0.75
C.
0.8
D.
1
Ans:
0.75
Explanation :
24-karat gold is pure (while 100% purity is unattainable, this designation is permitted in commerce for 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold).
[24] Limestone is a raw material used by which industry?
A.
Aluminium
B.
Fertilizers
C.
Cement
D.
Petrochemicals
Ans:
Cement
Explanation :
Limestone is used as a raw-material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar. Clay and shale are also used as raw materials for the production of cement.
[25] Atomic number of an atom gives the number of which of the following?
A.
electrons
B.
protons
C.
neutrons
D.
neutrons and protons
Ans:
protons
Explanation :
Atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It determines the place of an element in the periodic table. In an uncharged atom, the atomic number is also equal to the number of electrons.
Explanation :
Wrought iron or malleable iron is the purest form of commercial iron as it contains the lowest percentage of carbon (0.12-0.25%) and impurities of S, P, Mn and Si in minute amount (about 0.3%). It is made by melting cast iron with scrap iron in a reverberatory furnace lined with Fe203 which oxidizes C, Si, P, etc, most of which are then removed by rolling.
[20] Which of the following particles has the dual nature of particle-wave?
A.
Electron
B.
Meson
C.
Proton
D.
Neutron
Ans:
Electron
Explanation :
In 1905, it was Einstein who suggested the concept of light having a dual nature; particle and wave nature. In a similar way, Louise de Broglie suggested that electron also exhibits a dual nature. Broglie derived a mathematical expression to prove the wave nature of electron along with particle nature. He gave the following relation:- ë =h/mí, where ë is the wavelength of electron, m is mass of an electron and í is the frequency.
[21] Ultra purification of a metal is done by –
A.
slugging
B.
zone melting
C.
smelting
D.
leaching
Ans:
zone melting
Explanation :
When metals are required in a ultra pure state, the zone refining method is used. The principle- employed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase.
[22] An antiknock for petrol is -
A.
sodium hydroxide
B.
ethanol
C.
sodium benzoate
D.
lead tetraethyl
Ans:
lead tetraethyl
Explanation :
The organic compound that is used as an antiknock agent in petroleum is tetraethyl lead. This is a lead based organic compound.
[23] The ratio of Pure gold and 18 carot gold is –
A.
0.6
B.
0.75
C.
0.8
D.
1
Ans:
0.75
Explanation :
24-karat gold is pure (while 100% purity is unattainable, this designation is permitted in commerce for 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold).
[24] Limestone is a raw material used by which industry?
A.
Aluminium
B.
Fertilizers
C.
Cement
D.
Petrochemicals
Ans:
Cement
Explanation :
Limestone is used as a raw-material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar. Clay and shale are also used as raw materials for the production of cement.
[25] Atomic number of an atom gives the number of which of the following?
A.
electrons
B.
protons
C.
neutrons
D.
neutrons and protons
Ans:
protons
Explanation :
Atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It determines the place of an element in the periodic table. In an uncharged atom, the atomic number is also equal to the number of electrons.
Explanation :
When metals are required in a ultra pure state, the zone refining method is used. The principle- employed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase.
[22] An antiknock for petrol is -
A.
sodium hydroxide
B.
ethanol
C.
sodium benzoate
D.
lead tetraethyl
Ans:
lead tetraethyl
Explanation :
The organic compound that is used as an antiknock agent in petroleum is tetraethyl lead. This is a lead based organic compound.
[23] The ratio of Pure gold and 18 carot gold is –
A.
0.6
B.
0.75
C.
0.8
D.
1
Ans:
0.75
Explanation :
24-karat gold is pure (while 100% purity is unattainable, this designation is permitted in commerce for 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold).
[24] Limestone is a raw material used by which industry?
A.
Aluminium
B.
Fertilizers
C.
Cement
D.
Petrochemicals
Ans:
Cement
Explanation :
Limestone is used as a raw-material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar. Clay and shale are also used as raw materials for the production of cement.
[25] Atomic number of an atom gives the number of which of the following?
A.
electrons
B.
protons
C.
neutrons
D.
neutrons and protons
Ans:
protons
Explanation :
Atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It determines the place of an element in the periodic table. In an uncharged atom, the atomic number is also equal to the number of electrons.
Explanation :
24-karat gold is pure (while 100% purity is unattainable, this designation is permitted in commerce for 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold).
[24] Limestone is a raw material used by which industry?
A.
Aluminium
B.
Fertilizers
C.
Cement
D.
Petrochemicals
Ans:
Cement
Explanation :
Limestone is used as a raw-material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar. Clay and shale are also used as raw materials for the production of cement.
[25] Atomic number of an atom gives the number of which of the following?
A.
electrons
B.
protons
C.
neutrons
D.
neutrons and protons
Ans:
protons
Explanation :
Atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It determines the place of an element in the periodic table. In an uncharged atom, the atomic number is also equal to the number of electrons.
Explanation :
Atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It determines the place of an element in the periodic table. In an uncharged atom, the atomic number is also equal to the number of electrons.