1. The metal used to galvanise iron to protect it from rusting is
a) zinc
b) Chromium
c) Lead
d) Antimony
Explanation: Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting.
2. Iron is prevented from rusting by coating with zinc. This process is called as
a) Galvanisation
b) Corrosion
c) Sublimation
d) Sublimation
Explanation: Iron is prevented from rusting by coating with zinc. This process is called as galvanisation.
3.An electric iron has a heating element made of :
a) Copper
b) Tungsten
c) Nichrome
d) Zinc
Explanation: Nichrome is Used in an Electric Iron as a heating Element . It is an alloy of Nickel and Chromium with 80 % Nickel and 20 % Chromium. It has a high melting Point of 1400 degree Celsius.
4. The metal chiefly used for galvanising iron is :
a) zinc
b) Mercury
c) Cadmium
d) Tin
Explanation: Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.
5.The anode in a dry cell consists of
a) Copper
b) zinc
c) Cadmium
d) Graphite
Explanation: A standard dry cell comprises a zinc anode, usually in the form of a cylindrical pot, with a carbon cathode in the form of a central rod. The electrolyte is ammonium chloride in the form of a paste next to the zinc anode.
6. The National Chemical Laboratory is situated in
a) New Delhi
b) Bangalore
c) Pune
d) Patna
Explanation: National Chemical Laboratory (CSIR-NCL), Pune, established in 1950, is a constituent laboratory of Council of Scientific and Industrial Research (CSIR).
7. Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be
a) 2 : 16 : 2
b) 2 : 16 : 1
c) 1 : 16 : 2
d) 1 : 1 : 1
Explanation: Convert the mass into moles (use the formula n=m/Mr)
m = mass and Mr = Molecular weights
Molecular weights are 32(Oxygen), 2(Hydrogen), and 16(Methane), respectively.
Since the masses are equal, you can take the mass as x. So, the number of moles would be:
n(O2) = x/32
n(H2) = x/2
n(CH4) = x/16
The ratio of their volumes is (O2) : (H2) : (CH4) = 1 : 16 : 2
8. The mass number of an atom is equal to
a) the number of protons
b) the number of protons and electrons
c) the number of nucleons
d) the number of neutrons
Explanation: The mass number of an atom is equal to the number of nucleons.
9. The maximum number of covalent formed by nitrogen is
a) 1
b) 2
c) 3
d) 4
Explanation: Covalency of an atom in a covalent compound is the number of covalent bonds formed by an atom. Maximum covalency of Nitrogen is 4 (example - ammonium ions).
10. The formula C6H5-CO-CH3 represents
a) Acetone
b) Acetic acid
c) Acetophenone
d) Phenyl acetate
Explanation: The formula C6H5-CO-CH3 represents Acetophenone.
11. Highly toxic gas which causes headache, visual difficulty, paralysis and even death is
a) CO2
b) O3
c) CO
d) All of these
Explanation: Carbon monoxide intoxication can be caused by single or repetitively generated high short-term peaks, and carbon monoxide poisoning is the leading cause of death from poisoning (accidental and intentional).
12. Water gas is the combination of
a) CO and H2
b) CO2and H2
c) CO and H2O
d) CO2 and CO
Explanation: Water-gas A mixture of carbon monoxide (CO) and hydrogen (H2) produced by passing steam over red-hot coke using the endothermic reaction.
13.The gas that causes suffocation and death when coal or coke is burnt in a closed room is
a) Methane
b) ethane
c) Carbon monoxide
d) Carbon dioxide
Explanation: Exhaust fumes of motor cars, gases produced from coal fire in a closed room and coal gas, all contain carbon monoxide, which is the cause of their poisonous nature. When carbon monoxide is inhaled, it prevents the oxygen from combining with hemoglobin and instead combines itself with hemoglobin to form carboxyhaemoglobin, which is stable compound. This causes oxygen starvation in the body tissues and eventually causes death by suffocation.
14. Which one is not a pure form of carbon?
a) coal
b) Graphite
c) Diamond
d) Gold
Explanation: There are many pure forms of carbon in earth, but Diamond is the purest form of carbon. Other pure forms are graphite, fullerene and charcoal. Gold is not a form of carbon.
15.Which one is the purest form of carbon?
a) Coal
b) Graphite
c) Diamond
d) Iron
Explanation: There are many pure forms of carbon in earth, but Diamond is the purest form of carbon. Other pure forms are graphite, fullerene and charcoal.
16. The percentage of Nitrogen in Air is
a) 0.94
b) 0.03
c) 78.03
d) 85.02
Explanation: The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
17. Air is said to be saturated when :
a) It contains maximum content of water vapour
b) Its pressure is minimum
c) Its thickness is maximum
d) It blows over the barren land
Explanation: Air is said to be saturated when the amount of water vapour in the air is the maximum possible at an existing temperature and pressure. Air is said to be saturated at 100 percent relative humidity when it contains the maximum amount of moisture possible at that specific temperature.
18. For extinguishing fire, we use
a) Hydrogen
b) Carbon Monoxide
c) Carbon Dioxide
d) Marsh gas
Explanation: For extinguishing fire, we use Carbon Dioxide.
19. Dry powder fire extinguishers contain
a) sand
b) Sand and sodium carbonate
c) Sand and potassium carbonate
d) Sand and sodium bicarbonate
Explanation: Dry powder fire extinguishers contain Sand and sodium bicarbonate.
20. Dry ice is the solid form of :
a) Air
b) Carbon dioxide
c) Nitrogen
d) Water
Explanation: Dry ice, carbon dioxide in its solid form, a dense, snow like substance that sublimes (passes directly into the vapour without melting) at −78.5 °C (−109.3 °F), used as a refrigerant, especially during shipping of perishable products such as meats or ice cream.
21. When a spoon is to be electroplated with nickel the spoon is
a) Dipped in a nickel sulphate solution
b) Made anode and a pure nickel rod, the cathode
c) Made cathode and a pure nickel red, the anode
d) Coated with nickel sulphate and dried
Explanation: Electroplating is the deposition by electrolysis of a coating of metal upon a conducting surface. The simplest system makes the object to be plated the negative electrode (cathode) or plate in a galvanic couple. Thus a spoon or other object may be connected by a wire to a plate of nickel. The process that occurs on the spoon is called reduction and, therefore, the spoon is also referred to as a cathode.
22. Conversion of chemical energy into electrical energy occurs in
a) Atomic bombs
b) Dynamo
c) A battery
d) Electric heaters
Explanation: The chemical energy in food is converted by the body into mechanical energy and heat. The chemical energy in coal is converted into electrical energy at a power plant. The chemical energy in a battery can also supply electrical power by means of electrolysis.
23.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
Explanation: Galvanization or galvanizing (also spelled galvanisation or galvanising) is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which the parts are submerged in a bath of molten hot zinc.
24. Galvanization of iron is carried out using
a) Zinc
b) Tin
c) Copper
d) Copper
Explanation: Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.
25.The working of a dry cell is based on
a) Decomposition reaction
b) Spontaneous oxidation-reduction reaction
c) Combination reaction
d) Electrolysis
Explanation: A dry cell is a type of battery that uses a paste electrolyte, with only enough moisture to allow current to flow. It works in accordance with Faraday’s law of electrolysis. It consists of an outer case made of zinc (the negative electrode), a carbon rod in the center of the cell (the positive electrode), and the space between them is filled with an electrolyte paste. In operation the electrolyte, causes the electrons to flow and produce electricity.
26. Which of the following gases is present under pressure in soft drinks?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Nitrous oxide
Explanation: Carbon dioxide is present under pressure in soft drinks.
27. If we burn graphite,
a) Residue will be left
b) No residue will be left
c) it will not burn
d) It will change into diamond
Explanation: If we burn graphite, no residue will be left.
28. Lead pencil contains
a) Lead
b) Ferrous sulphide
c) Lead sulphide
d) Graphite
Explanation: Lead pencils contain graphite (a form of carbon), not lead. In fact, contrary to what many people believe, lead pencils never were made with lead. The ancient Romans used a writing device called a stylus.
29. Highest percentage of carbon is found in which form of coal?
a) Anthracite
b) Bituminous
c) Peat
d) Lignite
Explanation: Highest percentage of carbon is found in anthracite.
30. The main source of carbon monoxide is
a) Industrial process
b) Fuel combustion
c) Transportation
d) Solid waste disposal
Explanation: The main source of carbon monoxide is transportation.
31. Diamonds are glittering and attractive because light incident on them undergoes
a) Highest refraction
b) Multiple internal reflections
c) Multiple surface reflections
d) Hundred percent transmission
Explanation: Diamond has remarkable optical characteristics. Because of its extremely rigid lattice, it can be contaminated by very few types of impurities, such as boron and nitrogen. Combined with wide transparency, this results in the clear, colourless appearance of most natural diamonds. Small amounts of defects or impurities (about one per million of lattice atoms) colour diamond blue (boron), yellow (nitrogen), brown (lattice defects), green (radiation exposure), purple, pink, orange or red. Diamond also has relatively high optical dispersion (ability to disperse light of different colours), which results in its characteristic luster. Excellent optical and mechanical properties, combined with efficient marketing, make diamond the most popular gemstone.
32. If lime water is kept in the air, it turns milky due to presence of :
a) Carbon dioxide
b) Nitrogen
c) Oxygen
d) Sulphurdioxide
Explanation: If lime water is kept in the air, it turns milky due to presence of carbon dioxide.
33.Diamond is harder than graphite because of :
a) Difference in layers of atoms
b) Tetrahedral structure of diamond
c) Difference of crystalline structures
d) None of these
Explanation: Diamond is harder than graphite because diamond has a more complex structure. Diamond’s structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite’s structure is very loose, with its bonds forming layers. There will be one sheet of elements bonded together, but then another sheet of bonds of elements will lay on top of that, and there will be very weak bonds holding those sheets together.
34. The gas used to extinguish fire is
a) Neon
b) Nitrogen
c) Carbon dioxide
d) Carbon monoxide
Explanation: It is because carbon dioxide does not support combustion. When sprayed on burning object it stops the supply of oxygen and extinguishes fire.
35.Which among the following coal contains 90 per cent of carbon?
a) Anthracite
b) Bitumen
c) Lignite
d) Peat
Explanation: Anthracite coal contains 90 per cent of carbon.
36. Ozone layer of atmosphere absorbs:
a) Ultraviolet rays
b) Infra-red rays
c) All radiations of Light
d) Cosmic rays.
Explanation: The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. It contains a high concentration of ozone in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere.
37. Air shows the property of
a) N2
b) O2
c) Both A and B
d) None of these
Explanation: Air is mixture of different types of gases therefore it also shows the property of gases like Nitrogen and Oxygen.
38. The most abundant constituent of atmospheric air is :
a) Carbon
b) Hydrogen
c) oxygen
d) Nitrogen
Explanation: Air is the name given to the atmosphere used in breathing and photosynthesis. Dry air contains roughly (by volume) 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases.
39. The percentage of oxygen in air is approximately
a) 100%
b) 1%
c) 78%
d) 21%
Explanation: It's a mixture of different gases. The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
40. The major constituent of air is
a) Nitrogen
b) Carbon dioxide
c) oxygen
d) Carbon dioxide
Explanation: Below a height of about 86 kilometers, the three main gaseous elements, which together account for about 99.9% of the total atmosphere, exist in essentially constant proportion to the total: nitrogen comprises 78% of air by volume, oxygen comprises 21% of air by volume, and argon comprises another 0.9%.
41. Which type of fire extinguisher is used for petroleum fire ?
a) Foam type
b) Soda acid type
c) Powder type
d) None of these
Explanation: Powder type extinguisher is used for petroleum fire.
42. Man dies in the atmosphere of CO, because it
a) Dries up the blood
b) Combines with O2 present in the body
c) Reduces the organic matter of tissues
d) Combines with the haemoglobin of blood, thereby making the later incapable of absorbing O2
Explanation: The preferential binding of carbon monoxide to iron severely limits the oxygen to bind to hemoglobin. As a result, less oxygen is carried through our system and we die.
43.It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of
a) CO2
b) CO
c) Unburnt petrol
d) SO2
Explanation: The extremely high concentrations of carbon monoxide produced by an engine can raise CO concentrations in a closed building so quickly that a person may collapse before they even realize there is a problem.
Carbon monoxide reduces the amount of oxygen to the brain, causing CO intoxication, and lack of reasoning.
44. Which gas is used as fire extinguisher ?
a) Carbon dioxide
b) Carbon monoxide
c) Carbon suboxide
d) Sulphur dioxide
Explanation: Carbon dioxide is used as fire extinguisher.
45.The process which does not evolve CO2 in air is
a) Burning
b) Breathing
c) Organic delay
d) Photosynthesis
Explanation: The process which does not evolve CO2 in air is photosynthesis.
46. Galvanization is the :
a) Deposition of zinc on iron
b) Deposition of tin on iron
c) Deposition of copper on iron
d) Deposition of aluminium on iron
Explanation: Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.
47. Which one of the following metals is used to galvanise iron ?
a) Copper
b) Lead
c) Zinc
d) Mercury
Explanation: Zinc is used for galvanising iron to protect it from rusting.
48. A non-electronic conductor is
a) Iron
b) Gas Carbon
c) Copper Sulphate
d) None of these
Explanation: Either the wording of the question is wrong or it doesn’t have a correct option. A non-conductor is a substance which does not allow the passage of electricity. As a general rule, all metals (Iron, Mercury, etc) are good conductors. Nonmetals are non-conductors, except for carbon in the form of graphite and the gas carbon. Copper Sulphate is a good electrolyte (a liquid which allows the passage of electricity). So all the options given in the question are good electrical conductors.
49. The anode of a dry cell is made up of
a) Iron
b) Cadmium
c) Zinc
d) Lead
Explanation: A standard dry cell comprises a zinc anode, usually in the form of a cylindrical pot, with a carbon cathode in the form of a central rod. The electrolyte is ammonium chloride in the form of a paste next to the zinc anode.
50. The coating of a thin layer of zinc on steel or iron objects is known as
a) Hot dipping
b) Tinning
c) Galvanising
d) Electroplating
Explanation: Galvanisation is a process of protecting iron or steel from rusting by coating them with a thin layer of zinc.
51. The oil used in the froth floatation process is
a) coconut oil
b) olive oil
c) kerosene oil
d) pine oil
Explanation: The oil used in froth flotation process in pine oil, it is because it does not have affinity towards water and it easily attracts impurities and impurities can easily wash away.
52. The number of waves in n x 10th Bohr's orbit are
a)
b)
c)
d)
Explanation: The number of waves in n x 10th Bohr's orbit are n waves.
53.The mass of one Avogadro number of helium atom is
a) 1.00 gram
b) 4.00 gram
c) 8.00 gram
d) 4 x 6.02 x 1023 gram
Explanation: The mass of one Avogadro number of helium atom is 4 x 6.02 x 1023 gram.
54. The items amenable to detection by soft x-rays are
a) contrabands
b) lead in bullets
c) narcotics
d) genuine coins from counterfeit coins
Explanation: The items amenable to detection by soft x-rays are genuine coins from counterfeit coins.
55.The material which can be deformed permanently by heat and pressure is called a
a) thermoplastic
b) thermoset
c) chemical compound
d) polymer
Explanation: The material which can be deformed permanently by heat and pressure is called thermoset.
56. The iron ore magnetite consists of
a) Fe2O3
b) Fe3OH4
c) FeCO3
d) 3Fe2O3 .3H2O
Explanation: The iron ore magnetite consists of Fe2O3.
57. The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is
a) 5x/36
b) 5x
c) 7.2 x
d) x/6
Explanation: 5x/36
58. The major constituent of air is
a) carbon dioxide
b) nitrogen
c) Oxygen
d) hydrogen
Explanation: Below a height of about 86 kilometers, the three main gaseous elements, which together account for about 99.9% of the total atmosphere, exist in essentially constant proportion to the total: nitrogen comprises 78% of air by volume, oxygen comprises 21% of air by volume, and argon comprises another 0.9%.
59. The main chemical constituent of clay is
a) silicon oxide
b) aluminium borosilicate
c) zeolites
d) aluminium silicate
Explanation: Aluminium silicate is the main Chemical constituent of clay.
60. The mineral containing both magnesium and calcium is
a) magnesite
b) calcite
c) carnallite
d) dolomite
Explanation: The mineral containing both magnesium and calcium is Dolomite.
61. The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
a) p-electrons in Ne(Z = 10)
b) s-electrons in Mg(Z = 12)
c) d-electrons in Fe(Z = 26)
d) p-electrons in CI(Z = 17)
Explanation: The number of d-electrons in Fe2+ (Z=26) is not equal to the number of p - electrons in Cl(Z=17).
62. The metallurgical process in which a metal is obtained in a fused state is called
a) smelting
b) roasting
c) calcinations
d) froth floatation
Explanation: The process of extraction of metal in its molten state by any reducing agent in the presence of flux is called smelting.
63.The molecules of which gas have highest speed?
a) H2 at -73oC
b) CH4 at 300 K
c) N2 at 1,027oC
d) O2 at 0oC
Explanation: Among the given gases, hydrogen at −50oC has maximum value of T/M and highest speed.
64.The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth's early life and solidified into hard rock's called
a) granite
b) basalt
c) igneous rocks
d) sedimentary rocks
Explanation: The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth's early life and solidified into hard rock's called igneous rocks.
65.The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is
a) Dalton's law
b) Gay Lussac's law
c) Henry's law
d) aoult's law
Explanation: In physical chemistry, Henry's law is a gas law that states that the amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid. The proportionality factor is called Henry's law constant.
66. The metal does not give H2 on treatment with dilute HCL is
a) zn
b) Fe
c) Ag
d) Ca
Explanation: The metal does not give H2 on treatment with dilute HCL is Ag.
67. The number of g-molecule of oxygen in 6.02 x 1024 CO molecules is
a) 1 gram of molecule
b) 0.5 gram of molecule
c) 5 gram of molecule
d) 10 gram of molecule
Explanation: 5 gram of molecule
68.The most extensive, commercially useful source of thorium as monazite sand occurs in India at
a) Orissa coast
b) Travancore coast
c) West Bengal coast
d) Gujarat coast
Explanation: The most extensive, commercially useful source of thorium as monazite sand occurs in India at Travancore coast.
69. The main active constituent of tea and coffee is
a) nicotine
b) chlorophyll
c) caffeine
d) aspirin
Explanation: Caffeine is the main active constituent of tea and coffee.
70. The maximum number of isomers for an alkene with molecular formula C4H8 is
a) 5
b) 4
c) 2
d) 3
Explanation: The maximum number of isomers for an alkene with molecular formula C4H8 is 4.
71. The gas used for artificial ripening of green fruit is
a) ethylene
b) ethane
c) carbon dioxide
d) acetylene
Explanation: Ethylene gas, acetylene gas liberated from calcium carbide, and ethephon are some of the commercial ripening agents used successfully in the trade and they have been widely studied for their effectiveness on initiating and accelerating the ripening process and their effect on fruit quality and health related issues. Green fruits are ripened by ethylene gas.
72. Zone refining is used for the purification of
a) Au
b) Ge
c) Ag
d) Cu
Explanation: Zone refining is a very useful method to get metals with very high purity such as silicon and germanium. It is also referred to as zone melting, floating zone process, and travelling melting zone.
73.The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
a) cineole
b) engenol
c) geraniol
d) limonene
Explanation: The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is cineole.
74. The molecule which has the highest percentage of ionic character among the following is
a) HI
b) HF
c) HCI
d) HBr
Explanation: HF has the highest percentage of ionic character because F has the greatest electronegativity. F, Cl, I, and Br are all in the same group so that means their electronegativity (and thus percentage of ionic character) decreases as they go down the group in the periodic table.
75.The high reactivity of fluorine is due to
a) its high electro negativity
b) small size of fluorine atom
c) availability of d-orbitals
d) strong F - F bond
Explanation: The high reactivity of fluorine is due to its high electronegativity.
76. The Latin word formica means ant. The name formic acid is derived from this Latin word because
a) this acid, in ancient times, was used to eliminate ant-hills
b) this corrosive acid is secreted by ants to drive away their enemies
c) this acid was first obtained by the distillation of ants
d) ants are attracted by the odour of this acid
Explanation: The Latin word formica means ant. The name formic acid is derived from this Latin word because this acid was first obtained by the distillation of ants.
77. The ore which is found in abundance in India is
a) monazite
b) fluorspar
c) bauxite
d) magnetite
Explanation: The ore which is found in abundance in India is monazite.
78. The inherited traits of an organism are controlled by
a) RNA molecules
b) nucleotides
c) DNA molecules
d) enzymes
Explanation: The inherited traits of an organism are controlled by DNA molecules.
The traits an organism displays are ultimately determined by the genes it inherited from its parents, in other words by its genotype. Animals have two copies of all their chromosomes, one from each parent.
79. The heat energy produced when the human body metabolises 1 gram of fat is
a) 30 KJ
b) 1 KJ
c) 39 KJ
d) 29 KJ
Explanation: The heat energy produced when the human body metabolises 1 gram of fat is 39 KJ.
80. What are the number of moles of CO2 which contains 16 g of oxygen?
a) 0.5 mole
b) 0.2 mole
c) 0.4 mole
d) 0.25 mole
Explanation: One mole of CO2 has mass of 44 g and 32 g of O2.
So 16 g of O2 have 22 g of CO2 or 0.5 moles of it.
81. The mass number of a nucleus is
a) always less than its atomic number
b) the sum of the number of protons and neutrons present in the nucleus
c) always more than the atomic weight
d) a fraction
Explanation: The mass number (A), is the total number of protons and neutrons ns) in an atomic nucleus so sometimes more than and sometimes equal to its atomic number, depends upon no of neutrons.
82. The inexpensive and commonly used variety of glass is called soda glass. It is called so because
a) was used initially for making bottles of soda(carbonated drink)
b) is made using soda(sodium carbonate)
c) was initially used for storing sodium carbonate
d) is made using soda lime
Explanation: The inexpensive and commonly used variety of glass is called soda glass. It is called so because is made using soda(sodium carbonate).
83.The gas used in the manufacture of vanaspati from vegetable oil is
a) Hydrozen
b) oxygen
c) nitrogen
d) carbon dioxide
Explanation: Hydrogenation - to treat with hydrogen - is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst. The process is commonly employed to reduce or saturate organic compounds. The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.
84. The ionic radii of N3-, O2-, F- and Na+ follows the order
a) N3- > O2- > F- > Na+
b) N3- > Na+ > O2- > F-
c) Na+ > O2- > N3- > F-
d) O2- > F- > Na+ > N3-
Explanation: The ionic radii of N3-, O2-, F- and Na+ follows the order N3- > O2- > F- > Na+
85.The graphite rods in the nuclear reactor
a) react with U to release energy
b) produce neutrons
c) undergo combustion which triggers the nuclear fission
d) convert fast moving neutrons into thermal neutrons
Explanation: In nuclear reactor graphite rods are used as moderator or controller. Application of moderator is to slow down the neutron and controller is to control the number of neutron.
86. The main use of salt in the diet is to
a) make the taste of food better
b) produce in small amounts the hydrochloric acid required for the digestion of food
c) ease the process of cooking
d) increase the solubility of food particles in water
Explanation: The main use of salt in the diet is to produce in small amounts the hydrochloric acid required for the digestion of food.
87. The monomer of polythene is
a) vinyl chloride
b) ethylene
c) ethyl alcohol
d) None of the above
Explanation: Polyethylene is the most common plastic. The monomer is ethylene, a gaseous hydrocarbon with the formula C2H4 which can be viewed as a pair of methylene groups connected to each other.
88. The luster of a metal is due to
a) its high density
b) its high polishing
c) its chemical inertness
d) presence of free electrons
Explanation: Metallic lustre is due to the mobile electrons present in metals which when de-excites releases energy in the form of light.
89. The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is
a) 1.568 x 103
b) 6.023 x 1019
c) 4.84 x 1017
d) 6.023 x 1023
Explanation: The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is 6.023 x 1019.
90. The most malleable metal is
a) platinum
b) silver
c) iron
d) gold
Explanation: The most malleable metal is gold.
91. Which of the following phenomenon is considered responsible for Global Warming ?
a) Greenhouse effect
b) Fire in coal mines
c) Dry farming
d) Monsoon
Explanation: Modern global warming is the result of an increase in magnitude of the so-called greenhouse effect, a warming of Earth's surface and lower atmosphere caused by the presence of water vapour, carbon dioxide, methane, nitrous oxides, and other greenhouse gases.
92. The nucleus of an atom consists of
a) electrons and neutrons
b) electrons and protons
c) protons and neutrons
d) All of the above
Explanation: The nucleus of an atom consists of protons and neutrons.
93.The number of moles of solute present in 1 kg of a solvent is called its
a) molality
b) molarity
c) normality
d) formality
Explanation: Molality is the property of a a solution that is defined as the number of moles of solute per kilogram of solvent.
94. The most electronegative element among the following is
a) sodium
b) bromine
c) fluorine
d) oxygen
Explanation: Fluorine is the most electronegative element and also the most reactive non-metal.
95. The metal used to recover copper from a solution of copper sulphate is
a) Na
b) Ag
c) Hg
d) Fe
Explanation: The metal used to recover copper from a solution of copper sulphate is Fe.
96. The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
a) carbon
b) hydrogen
c) oxygen
d) nitrogen
Explanation: The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is Oxygen.
97. The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is
a) chain isomerism
b) functional group isomerism
c) positional isomerism
d) metamerism
Explanation: The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is positional isomerism.
98. The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?
a) 1/6
b) 1/3
c) 1/8
d) 1/4
Explanation: The half life period of an isotope is 2 hours. After 6 hours 1/8 of the original amount, or 12.5% of the isotope will be left behind.
99. The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3
a) 4
b) 5
c) 2
d) Zero
Explanation: The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3 is 4.
100. The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in
a) 1.8 gram of H2O
b) 12 moles of KMnO4
c) 0.6N H2SO4
d) 4.6 gram of C2H5OH
Explanation: The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in 12 moles of KMnO4