CHEMISTRY 188 Qts & Ans
CHEMISTRY
1. Gobar contains mainly
a) a) Carbon dioxide
b) b) Methane
c) c) Ethylene
d) d) Carbon monoxide
Ans: b
2. If a large number of people are enclosed in
room, then
a) a) Oxygen decreases and carbon dioxide
increases
b) b) Oxygen increases and carbon dioxide decreases
c) c) Both oxygen and carbon dioxide
decrease
d) d) Both oxygen and carbon dioxide
increase
Ans: a
3. The density of sea water is highest as
a) a) Depth increases and salinity
increases
b) b) Depth decreases and salinity
increases
c) c) Depth increases and salinity
decreases
d) d) Depth decreases and salinity
decreases
Ans: a
4. The temperature for pasteurization of milk
is selected so as to
a) Kill the micro –organisms
b) Kill all bacteria
c) Store it for long time without
coagulation
d) Kill the micro organisms and other
harmful bacteria
Ans: c
5. What is the most important factor for the
growth of pests is stored grains?
a) a) The moisture of grains
b) b) The temperature of grains
c) c) The moisture and temperature of
grains
d) d) None of the above
Ans: c
6. Age of a tree can be determined
a) a) By counting the number of rings
b) b) By thickness of the bark
c) c) BY bulk of the tree
d) d) By number of leaves
Ans :a
7. One litre of cold air weighs heavier than
the dry air (1 Liter) because of the
a) a) Increased number of collisions
between the molecules
b) b) Increased number of molecules at low
temperature
c) c) Greater energy of molecules ar high
temperature
d) d) Lower energy of molecules at high
temperature
Ans: b
8. Which of
the following metals is used in the electromagnets?
a) Soft iron
b) Stainless steel
c) Cobalt
d) Copper
Ans: a
9. The bats can fly in the dark because
a) a) They have a better vision in the dark
b) b) The light startles them
c) c) They produce ultrasonic
d) d) None of the above
Ans: c
10. The chief constituent of gabar gas is
a) a) Methane
b) b) Carbon dioxide
c) c) Acetylene
d) d) Ethy lene
Ans: a
11. The heating element in an electric iron is
made of
a) a) Nichrome Tungsten
b) b) Tungsten
c) c) Copper
d) d) Iron
Ans: a
12. Dry ice is
a) a) Solid carbon dioxide
b) b) Ice dust
c) c) Liquefied nitrogen
d) d) Liquefied hydrogen
Ans: a
13. When iron rusts, the weight
a) Increases
b) Decreases
c) Remises then decreases
d) First increases then decreases
Ans: a
14. What is mainly obtained from bauxite?
a) a) Copper
b) b) Aluminum
c) c) Iron
d) d) Gold
Ans: b
ubstance is commonly used in
refrigeration’s?
a) Freon
b) Oxygen
c) Ammonia
d) Sulphare dioxide
Ans: a
16. Municipal water in India is generally
treated with
a) a) Chlorine
b) b) Potassium permanganate
c) c) Sodium Chloride
d) d) Sodium Carbonate
Ans: a
17. What is done raise the dough while making
bread?
a) a) Alcohol is added
b) b) Yeast is added
c) c) Carbon dioxide is passed
d) d) Air is passed
Ans: b
18. Which of the following statements is true?
a) a) Both salinity and density of sea
increase with depth
b) b) Both salinity and density of sea
decreases with depth
c) c) Salinity increases bur density of sea
decreases with depth
d) d) Salinity decreases but density of sea
increases
Ans: d
19. Which of the following is commonly present
in the acids?
a) a) Oxygen
b) b) Hydrogen
c) c) Sulphur
d) d) Nitrogen
Ans: b
20. In what
sequence are the following obtained from a natural gas well?
a) a) Natural Gas
b) b) Water
c) c) Crude oil
Codes:
a) 1, 3, 2
b) 1, 2 , 3
c) 3, 2, 1
d) 2, 1, 3
Ans: a
21. Why camphor disappears when kept on a
plate?
a) a) It sublimes
b) b) It reacts with the metal of the
container
c) c) It reacts with the gases of the air
d) d) None of the above
Ans: a
22. Gypsum is added to the soil?
a) To increases the alkalinity?
b) To decrease the acidity
c) To decrease the alkalinity
d) As an insecticide
Ans: b
(1982)
23. The substance generally used in the tip of
safety match stick is
a) a) Red phosphorus
b) b) Sodium
c) c) Yellow phosphorus
d) d) Antimony trisulphide
Ans: a
24. The dress made out of which of the
following is safe to wear while cooking?
a) Nylon
b) Terylene
c) Silk
d) Cotton
Ans: d
25. Which of the following is useful in the
chemistry of photography?
a) a) Silver bromide
b) b) Aluminum hydroxide
c) c) Sodium chloride
d) d) Potassium nitrate
Ans: a
26. The process by which metal surface is
coated with thin layer of zinc is called
a) a) Vulcanising
b) b) Galvanising
c) c) Electroplating
d) d) None of these
Ans: b
27. Gasohol
is mixture of gasoline and
a) a) Ethyl alcohol
b) b) Methyl alcohol
c) c) Kerosene
d) d) Butyl alcohol
Ans: a
28. Ozone present in the ozone layer of the
atmosphere is important because
a) a) It gives oxygen on dissociation
b) b) It shields other gases
c) c) It helps the growth of the plants by
absorbing a large proportion of the sun’s ultraviolet radiation
d) d) None of these
Ans: c
29. After
sowing seeds, the fertilizers used are
a) a) Phosphates Nitrates
b) b) Green manures
c) c) All of these
d) d) All of these
Ans: d
30. The
chief constituent of gober gas is
a) Hydrogen
b) Nitrogen
c) Ethane
d) Methane
Ans: d
(1983)
31. Diamond
and Emeralds contain
a) a) Carbon and silicon
b) b) Carbon and zinc
c) c) Silicon, aluminum and beryllium
d) d) Carbon and calcium
Ans: c
( 1983)
32. The
internal antenna of a transistor set is made of
a) a) Iron
b) b) Ferro – chrome
c) c) Copper
d) d) Alnico
Ans: b
33. The
common ore of aluminum is
a) a) Bauxite
b) b) Chromite
c) c) Cryolite
d) d) Monazite
Ans: a
34. Radio carbon dating process is used to know
the age of
a) a) Fossils
b) b) Plants
c) c) Rocks
d) d) All of these
Ans: d
35. Aspirin is a
a) a) Pain reliever
b) b) Sedative
c) c) Cortisone
d) d) Soporific
Ans: a
36. Arrange the following fertilizers
according to the decreasing order of their nitrogen content
1) Ammonium sulphate
2) Ammonium nitrate
3) Potassium nitrate
4) Urea
Select the correct answer using the codes given below:
a) 4, 2, 3, 1
b) 4, 2, 1, 3
c) 4, 3, 2, 1
d) 2, 4, 3, 1
Ans: b
37. Helium is used for respiration in deep
water instead of nitrogen because
a) a) It is heavier than nitrogen
b) b) It is lighter than nitrogen
c) c) It mixes less in blood than nitrogen
d) d) It helps oxygen burn more quickly
Ans: c
38. In a
fluorescent tube which of the following components are found?
a) a) Mercury vapour
b) b) Argon and carbon dioxide
c) c) Helium and oxygen
d) d) Argon and neon
Ans: a
39. For artificial insemination the semen of a
bull should be stored in
a) a) Cold water
b) b) Ice
c) c) Liquid nitrogen
d) d) Liquid nitrogen Liquid oxygen
Ans: c
40. Which
one is a high yielding variety of rice?
a) a) IR-8
b) b) IR-21
c) c) K-64
d) d) M-986
Ans: b
41. In a
remote Indian village with a scarcity of fuel, the people draw water from well.
They should be advised before drinking water to
a) a) Boil it
b) b) Use ion exchange resins
c) c) Use solar stills for distilling
d) d) Use potassium permanganate for
purifying the water
Ans: d
42. Arrange
the following in the decreasing order of their carbon content
a) a) Cast iron
b) b) Wrought iron
c) c) Steel
Select the correct answer suing the codes given below:
a) 1, 2, 3
b) 2, 1, 3
c) 3, 2, 1
d) 1, 3, 2
Ans: a
43. Assertion: Galvanised iron pipes do not rust
easily
Reason: Zinc has a higher rate of oxidation
than iron.
a) a) If both A and R are true and R is not
the reason for A
b) b) If both A and R are true and R is the
reason for A
c) c) If neither A nor R is correct
d) d) If A is correct but R is wrong
Ans: b
(1984)
44. Which of the following is not an alloy?
a) a) Bronze
b) b) Brass
c) c) Steel
d) d) Zinc
Ans: d
45. Chlorine
is
a) a) A rare earth element
b) b) A halogen
c) c) A noble gas
d) d) Coinage metal
Ans: b
46. Micro –
elements needed to increase soil fertility are
a) a) Nitrogen, hydrogen and calcium
b) b) Nitrogen, phosphorus and potassium
c) c) Iron, calcium and potassium
d) d) Manganese, copper and zinc
Ans: a
47. Solution of washing soda is water is
a) a) Acidic
b) b) Basic
c) c) Neutral
d) d) Sour
Ans: d
48. Which of
the following is an insecticide?
a) TNT
b) DDT
c) Salicylic acid
d) Ammonium phosphate
Ans: b
49. The tape
of the tape- recorder is coated with
a) a) Cooper sulphate
b) b) Mica
c) c) Ferromagnetic powder
d) d) Zinc oxide
Ans: c
(1985)
50. Which of
the following is a weekkiller?
a) a) Insecticide
b) b) Methyl salicylate
c) c) Heribicide
d) d) None of these
Ans: c
51. Match
the columns:
A. Glass
: 1. Phosphorus
B. Match : 2.
Sodium chloride
C. Fertilizer : 3. Sodium silicate
D. Salt : 4. Potassium sulphate
Select the correct answer from the codes given below:
A B
C D
a) 3
4 2 1
b) 3
1 4 2
c) 2
3 1 4
d) 4
3 2 1
Ans: b
52. Match the columns:
A. Bauxite : 1. Copper
B. Monazite : 2.
Uranium
C. Malachite :
Thorium
D. Pitchblende: 4. Aluminum
Select the
correct answer from the codes given below
A B
C D
a) 3
4 2 1
b) 3
1 2 4
c) 4
3 1 2
d) 4
3 2 1
Ans:
d
53. Which of the following statements about ozone
layer is correct?
a) a) It converts UV radiations into
electrical energy
b) b) It protects the earth’s life forms by
preventing the damaging UV radiations form reaching earth’s surface
c) c) It is of uniform thickness
d) d) None of the above
Ans: b
54. A new biofertiliser is
a) a) Compost
b) b) Farmyard manure
c) c) Blue green algae
d) d) Nitrates
Ans: c
55. Which of
the following elements exists in maximum quantity in atmosphere?
a) a) Oxygen
b) b) Hydrogen
c) c) Carbon
d) d) Nitrogen
Ans: d
56.
Assertion: Carbon dioxide in air is necessary for sustaining life.
Reason:
Carbon dioxide is assimilated in carbohydrates in photosynthesis.
a) a) if A and R both are correct and R is
the correct explanation of A
b) b) if A and R both are correct and R is
the correct explanation of A
c) c) if A is correct and R is incorrect
d) d) if A is incorrect and R is correct
Ans: a
57. Assertion: Alkalis are used for washing
utensils.
Reason:
Alkalis are readily soluble in water.
a) a) if A and R both are correct and R is
the correct explanation of A
b) b) if A and R both are correct but R is not the correct explanation of A
c) c) if A is correct and R is incorrect
d) d) if A is incorrect and R is correct
Ans: d
58. Which of the following is the organic
matter of animal and vegetable origin in the soil?
a) Humus
b) Vermiculite
c) Fulminic Acid
d) None of the above
Ans: a
59. In India, the problem of utilization of
agriculture wasters is in
a) a) Conversion of starch into alcohol
b) b) Conversion of sugar into
carbohydrates
c) c) Conversion of bran into molasses
d) d) Conversation of cellulose into sugar
Ans: a
(1987)
60. Main constituents of Biogas are
a) a) Methane Carbon dioxide
b) b) Ethylene and Carbon dioxide
c) c) Butane and Carbon monoxide
d) d) Methane and Carbon monoxide
Ans: a
61. Urea is prepared by the chemical reaction
of
a) a) Ammonia an carbon dioxide
b) b) Ammonium Sulphate and calcium
chloride
c) c) Butane and Carbon monoxide
d) d) Methane and Carbon monoxide
Ans: a
62. A biogas plant works to its maximum
capacity when
a) Conditions are aerobic and
temperature is 40
C.
b) Conditions are an aerobic and
temperature is 40C.
c) Acetamide and ethyl alcohol
d) Chlorine and water
Ans: b
63. Radioactive element which has been found
to have large reserve in India is
a) a) Thorium
b) b) Utranium
c) c) Radium
d) d) Plutonium
Ans: a
64. Chemical composition of urea
a) a) Calcium carbonate
b) b) Calcium carbonate and magnesium
corbonate
c) c) Calciumsulphate
d) d) Calcium chloride
Ans: a
65. The chemical name for urea is
a) Aneurin
b) Chlorethene
c) Carbamide
d) None of these
Ans: c
(1988)
66. Match
the columns:
List I :
List II
A. Bauxite
: 1. Lead
B. Silicon : 2. Thorium
C. Galena : 3. Aluminum
D. Monazite : 4. Computer memory
Select the correct answer from the codes given below:
A B
C D
a) 3
4 1 2
b) 4
2 1 3
c) 3
1 4 2
d) 2
4 3 1
Ans: a
67. Match the columns:
List I :
List II
Organic acids : Substances in which they are present
A. Lactic acid : 1. Lemon
B. Acetic acid : 2. Rancid butter
C. Citric acid : 3. Milk
D. Butyric acid : 4. Vinegar
: 5. Wine
Select the correct answer from the codes given
below:
A B
C D
a) a) 5
4 3 2
b) b) 3
1 4 5
c) c) 2
5 1 3
d) d) 3
4 1 2
Ans: d
68. The newly discovered high – temperature
superconductors are
a) a) Metal alloys
b) b) Pure rare – earth metals
c) c) Ceramic oxides
d) d) Inorganic polymers
Ans: a
69. The drugs – caffeine, tannin and nicotine
are
a) Steroids
b) Cortisones
c) Alkaloids
d) Mild alkalis
Ans: c
70. Which one of the following is a non –
metallic minerals?
a) a) Manganese
b) b) Magnesium
c) c) Gypsum
d) d) Bauxite
Ans: c
71. Which of the following chemicals in
automobile exhaust can cause cancer?
a) a) Carbon monoxide
b) b) Polycyclic hydrocarbons
c) c) Lead
d) d) Oxides of nitrogen
Ans: d
72.
Assertion (A) : A dry cell cannot recharged.
Reason ( R)
: The chemical reaction in a dry cell is reversible.
a) a) Both A and R are true and R is the
correct explanation of A
b) b) Both A and R are true but R is NOT a
correct explanation of A
c) c) A is true but R is false
d) d) A is false but R is true
Ans: c
73. Assertion (A) : Detergents can easily
remove oil and dirt from soiled garments.
Reason ( R)
: Detergents increase the surface tension of water.
a) a) Both A and R are true and R is the
correct explanation of A
b) b) Both A and R are true but R is NOT a
correct explanation of A
c) c) A is true but R is false
d) d) A is false but R is true
Ans: c
74. Assertion (A) : Red phosphorous is
preferred to white phosphorous in the manufacture of matches.
Reason: (
R): Red phosphorous is non poisonous in nature
a) a) Both A and R are true and R is the correct
explanation of A
b) b) Both A and R are true but R is NOT a
correct explanation of A
c) c) A is true but R is false
d) d) A is false but R is true
Ans: a
75. If
there were no organic life on the Earth, the amount of oxygen in the atmosphere
will
a) Remain unchanged.
b) Be approximately hundred per cent.
c) Be almost nil.
d) Be approximately hundred per cent.
Ans: c
76. Ice skating can be used to demonstrate
that when ice is under pressure, its
a) Melting points is lowered
b) Melting point is raised
c) Melting pointremians unchanged
d) Coffieicient of friction with metal
is reduced
Ans:
a
77. The chief ingredient of the mosquito
repellent cream is derived from
a) Tulsi
b) Neem
c) Lemon
d) Rice bran
Ans: a
78. Sparkling red colour after the blast of
rice crackers is due to the presence of
a) Strontium
b) Sodium
c) Sulpture
d) Magnesium
Ans: c
79. The chemical name of ‘aspirin ‘is
a) Acetyl Cyanamid
b) Acetyl Salicylic Acid
c) Benzyl Salicylate
d) Tartaric Acid
Ans: b
80. Sodium vapour lamps are preferred to
incandescent lamps because of
a) Higher efficiency
b) Higher tolerance in voltage
flutucations
c) Easy installation
d) Higher intensity of illumination
Ans: d
81. Which of the following is not an alloy?
a) a) Brass
b) b) Bronze
c) c) Steel
d) d) Zinc
Ans: d
82. The highest grade of coal, whose surface
is shining and has the highest calorific value, is
a) Lignite
b) Peat
c) Bitumious
d) Anthracite
Ans: d
83. Paraffin is a – product of
a) a) Petroleum refining
b) b) Processing of agricultural wastes
c) c) Cottage industries involving beekeeping
d) d) Leather industry
Ans: a
84. Assertion (A) Unlike photographic film,
which can be used only once, video tapes can be reused several times.
Reason ( R)
“ Photography involves chemical change but video recording is a physical
change.
a) a) Both A and R are true and R is the
correct explanation of A
b) b) Both A and R are true but R is not a
correct explanation of A
c) c) A is true but R is false
d) d) A is false but R is true
Ans: a
85.
Assertion (A) : Activated charcoal is used for decolorising sugar solution.
Reason ( R)
Activated charcoal absorbs the impurities on its surface.
a) a) Both A and R are true and R is the
correct explanation of A
b) b) Both A and R are true but R is not a
correct explanation of A
c) c) A is true but R is false
d) d) A is false but R is true
Ans: a
86. The process of retting in jute is
a) Purel physical
b) Purely chemical
c) Microbiological
d) Physicochemical
Ans: a
87. Water which contains soluble salts of
calcium and magnesium is known as
a) a) Heavy water
b) b) Soft water
c) c) Hard water
d) d) Mineral water
Ans: c
88. Elements having atomic number higher than
‘92’ in the periodic table are known as
a) Transitional elements
b) Rare earth elements
c) Transuranic elements
d) Alkaline earth metals
Ans: c
89. Which of
the following pairs of substances can be completely separated by sublimation?
a) a) Sand and iodine
b) b) Ammonium chloride and iodine
c) c) Sand and sulfur
d) d) Salt an sulfur
Ans: a
90. Some medicines are given in the form of
capsules.
a) The capsules
are made of
a) b) Paper
b) c) Gelatinous material
c) d) Embroynic tissue
d) Starch
Ans: b
91. The chemical name of ‘Aspirin’ is
a) a) Acetyl cyamide
b) b) Acetyl salicylic acid
c) c) Benzyl salicylate
d) d) Tartaric acid
Ans: b
92. Atoms of the same element having the same
atomic number but different atomic weight are called
a) a) Isobars
b) b) Isotopes
c) c) Polymers
d) d) Isomers
93. The gas
used for artificial ripening of green fruits is
a) a) Carbon dioxide
b) b) Ethane
c) c) Hydrogen
d) d) acetylene (ethyne)
Ans: d
94. Three important micronutrients essential
for humans are
a) a) Copper, zinc and iodine
b) b) Zinc, copper and potassium
c) c) Nitrogen, molybdenum and iodine
d) d) Sulphur, copper and iron
Ans: a
95. Natural rubber is a plant product which is
chemically known as
a) a) Mucilage
b) b) Gum
c) c) Latex
d) d) Resin
Ans: c
96. Gypsum is added to cement clinker to
a) a) Increase the tensile strength of the
cement
b) b) Bind the parties of calcium silicate
c) c)Decrease the rate of setting of
cement
d) d) Facilitate the formation of colloidal
gel
Ans: c
97. German silver is an alloy of
a) Copper, zinc and nickel
b) Copper, iron and tin
c) iron, chromium and nickel
d) copper,aluminium and nickel
98. The varation of temperature with
heating of a solid substance, heated at constant rate, is shown in the following
figure
a) AB
b) BC
c) CD
d) DE
Ans: a
99. Galvanising of sheet iron is done by
dipping the sheet metal into molten
a) a) Mercury
b) b) Cadmium
c) c) Lead
d) d) Zinc
Ans: d
100. Which
one of the following is an element?
a) a) Ruby
b) b) Sapphire
c) c) Emerald
d) d) Diamond
Ans: d
101. It has
been observed that after effects of low temperature treatment are helpful in
promoting the flowering in certain plants. Through this the vegetative period
of plant becomes short and early flowering takes place. This Phenomenon is
known as
a) a) Photoperiodism
b) b) Floreignation
c) c) Vernaliasation
d) d) Heliotropism
Ans: c
102. The minimum possible temperature beyond
which matter cannot be cooled is
a) a) – 98. 10
b) b) - 100.00
c) c) – 273. 15
d) –d) 459. 40
Ans:
c
103. Given below is a dairy of disasters
involving hazardous chemicals. Which one of the following correctly matched?
a) a) 1959, Minamata/ Nigiata, Japan:
Leakage at pesticide plant
b) b) 1976, Sevesor Italy: Mercury
discharged into waterways.
c) c) 1984, Bhopal, India : Leakage of dioxin
d) d) 1987, Kotka, Finland: Monochord –
benzene split In harbor
Ans: d
104. Which one of the following is used for
dating archaeological specimens in wood, bones and shells?
a) a) Uranium – 238
b) b) Argon isotope
c) c) Carbon – 14
d) d) Strontium – 90
A, Ans: c
105. Which one of the following colloidal
systems is represented by fog?
a) a) Liquid in gas
b) b) Gas in liquid
c) c) Soild in gas
d) d) Liquid in liquid
Ans: a
106. The Government of India has totally
banned the export of ‘Burnt Coal’ (Jhama), because it contains recoverable
amount of a metal/element used in transistors. Which one is the element?
a) a) Phophorus
b) b) Germanium
c) c) Silicon
d) d) Tungsten
Ans: b
107. Though a few (gas –based) industries have
already been established good reserve of natural gas in India remain
unutilized. This vast resources of natural gas can be used in the production of
a) fertilizers
b) carbide
c) graphite
d) synthetic petroleum
Ans: a
108. Assertion (A): A mixture of salt and ice
gives temperature below 0 C
Reason ( R) : The salt raises the freezing
point of ice In the context of the above two statements, which one of the
following is correct?
a) a) Both A and R are true and R is the
correct explanation of A
b) b) Both A and R are true but R is Not a
correct explanation of A
c) c) A is true but R is false
d) d) A is false but R is true
Ans: c
109. Vinegar
is an aqueous solutions of
a) oxalic acid
b) citric acid
c) acetic acid
d) hydrochloric acid
Ans: d
110. Which one of the following is in the
correct sequential order in which these appeared under simulated primitive earth
conditions?
a) a) Methane, Hydrogen cyanide, nitriles,
amino acids
b) b) Hydrogen cyanide, methane, nitriles,
amino acids
c) c) Aminoacids, nitriles, Hydrogen
cyanide, methane
d) d) itriles, amino acids, methane,
Hydrogen cyanide.
Ans: b
111. The basic reason for the extraordinary
sparkle of a suitable cut diamond is that
a) a) It has Avery high transparency
b) b) It has a very high refractive index
c) c) It is very hard
d) d) It has well – defined cleavage places
Ans: d
112. The
main constituents of pearl are
a) a) Calcium carbonate and magnesium carbonate
b) b) Aragonite and conchioin
c) c) Ammonium sulphate and sodium
carbonate
d) d) Calcium oxide and ammonium chloride
Ans: a
113.
Monazite is an ore of
a) Zirconium
b) tjrorium
c) Titanium
d) Iron
Ans: b
114. Galvanised iron sheets are protected from
rusting due to the presence of a layer of
a) a) lead
b) b) chromium
c) c) zinc
d) d) tin
Ans: c
115. Which
radioactive pollutant has recently drawn the attention of the public, due to
its occurrence in the building material?
a) a) Plutonium
b) b) Thorium
c) c) Radon
d) d) Radium
Ans: c
116. Water is a good solvent of ionic salts because
a) a) It has a high boiling point
b) b) It has high dipole moment
c) c) It has high specific heat
d) d) It has no color
Ans: b
117. Which one of the following is a mixed
fertilizer?
a) a) Urea
b) b) CAM
c) c) Ammonium Sulphate
d) d) NPK
Ans: d
118. Which one of the following polymers is
widely used for making bullet proof material?
a) a) Polyvinyl chloride
b) b) Polyethylene
c) c) Polyamides
d) d) Polycarbonates
Ans: c
119. The chemical used a ‘fixer’ in
photography is
a) a) Sodium Sulphate
b) b) Sodium thisulphate
c) c) ammonium persulphate
d) d) borax
Ans: b
120. Which one of the following pairs of materials
serves as electrodes in as electros in chgeblechargeable batteries commonly,
used in devices such as torchlights, electric shavers, etc?
a) Nickel and cadmium
b) Zinc ad carbon
c) Lead peroxide and lead
d) Iron and cadmium
Ans: b
121. ‘The final Agent Orange is killing and maiming
human beings, something it never intended to do. The apartment toxic fall out
from those clouds … is a crop of human miseries including cancers, miscarriages
and birth defects – that persist for decades. “The offensive substance referred
to in the above quotation is
a) DDT used as insecticide
b) A complex immature of herbicides and
weedicides used to increase agriculture output in the then South Vietnam under
the US sai programmer
c) A complex mixture of DDT and other
insecticides used as aerial sprays for protection against malaria and other
tropical diseases.
d) Dioxin used as defoliants
Ans: b
122. ‘Yellow cake’, an item on smuggling
across borders is
a) a crude form of heroin
b) a crude form of cocaine
c) uranium oxide
d) unrefined gold
Ans: c
123. The alpha – particle carries two positive
charges. Its mass is very nearly equal to that of
a) a) two protons
b) b) an atom of helium
c) c) sum of masses of two positions and
two matrons
d) d) two positrons as each positron
carries a single positive charge
Ans: b
124. The offending substance in the liquor
tragedies leading to blindness, etc. is
a) a) ethyl alcohol
b) b) chromium
c) c) benzyl alcohol
d) d) methyl alcohol
Ans: d
125. Which one of the following elements is
alloyed with iron to produce steel which can resist high temperature and also
have high hardness and abrasion resistance?
a) a) Aluminum
b) b) Chromium
c) c) Nickel
d) d) Tungsten
Ans: b
126. The most reactive among the halogens is
a) fluorine
b) chlorine
c) bromine
d) iodine
Ans: a
127. Which one for the following is
paramagnetic in nature?
a) Iron
b) Hydrogen
c) Oxygen
d) Nitrogen
Ans: c
128. Which one of the following has the
highest fuel value?
a) a) Hydrogen
b) b) Charcoal
c) c) Natural Gas
d) d) Gasoline
Ans: a
129. Which one of the following is used as an
anti – freeze for the automobile engines?
a) Propyl alcohol
b) Ethanol
c) Methanol
d) Ethylene glycol
Ans: d
130. The stones formed in human kidney consist
mostly of
a) a) calcium oxalate
b) b) Sodium acetate
c) c) magnesium Sulphate
d) d) Calcium
Ans: a
131. Most of the expulsions in mines occur due
to the mixing of
a) a) hydrogen with oxygen
b) b) oxygen with acetylene
c) c) methane with air
d) d) carbon dioxide with ethane
Ans: c
132. Match List I
with List II and select the correct answer using the codes given below
the Lists:
List I : List II
A. German Silver : 1. Tin
B. Solder : 2. Nickel
C. Bleaching powder : 3. Sodium
D. Hypo : Chlorine
Codes: A
B C D
a) 1
2 4 3
b) 2
1 3 4
c) 1
2 3 4
d) 2
1 4 3
Ans: d
133. Which one of the following materials is
very hard and very ductile?
a) Carborundum
b) Tungsten
c) Cast Iron
d) Nichrome
Ans: d
134. Soft drinks such as colas contain
significant quantities of
a) caffeine
b) nicotine
c) tannin
d) rennin
Ans: a
135. Aluminums surfaces are often ‘anodized’.
This means the depositions of la layer of
a) chromium oxide
b) aluminums oxide
c) nickel oxide
d) zinc oxide
Ans: b
136. A
small pouch containing silica gel is often found in bottles of medicine tablet
or form because silica gel
a) kills bacteria
b) kills germs and spores
c) absorbs moisture
d) absorbs all gases present inside the bottle
Ans: c
137. Match
List I (Industrial process) with List II( Industry with associated ) and select
the correct answer using the codes given below the Lists:
List I : List II
A. Cracking : 1. Rubber
B. Smelting : 2. Petroleum
C. Hydrogenation : 3.
Copper
D. Vulcanization : 4. Edible fats
Codes:
A B
C D
a) 3
2 1 4
b) 2
3 4 1
c) 2
3 1 4
d) 3
2 4 1
Ans: b
138. Assertion (A) : Large cold storage plants
use ammonia as refrigerant while domestic refrigerants use chlorofluorocarbons.
a) Both A and R are true, and R is
the correct explanation
b) Both A and R are true, and R is not a the
correct explanation of A
c) A is true, but R is false
d) A is false, but R is true
Ans: a
139. Consider the following statements Hard
water not suitable for
1) drinking
2) washing clothes with soap
3) use in boilers
4) irrigating crops
Which of the statements
are correct?
a) 1 and
3
b) 2 and
3
c) 1, 2 and 4
d) 1, 2 , 3 and 4
Ans” b
140. Canola refers to special type of oil seed
mustard charities bred for human consumption. The main characteristic of theses
varieties is that the
a) seeds have very high oil content
b) oil is rich unsaturated fatty acids
c) oil has long shelf – life
d) oil has very low Erucic acid content
Ans: a
141. Match List I
with List II and select the correct answer using the codes given below
the Lists
List I : List
II
(Characteristic) : (particle)
A. Zero mass : 1. Particle)
B. Fractional charge : 2. Neutrino
C. Fractional spin : 3. Quark
D. Integral spin : 4. Phonon
Codes:
A B C D
a) 2
3 1 4
b) 3 2 4 1
c) 2
3 4 1
d) 3
2 1 4
Ans: b
142. Assertion (A) : Chemical reaction becomes
faster at higher temperatures.
Reason ® :
At higher temperatures, molecular motion becomes more rapid.
a) Both A and R are individually true
and R is the correct explanation rapid.
b) Both A and R are true, and R is NOT a the
correct explanation of A
c) A is true, but R is false
d) A is false, but R is true
Ans: a
143. Which one of the following is the correct
sequence in increasing order of molecular weights of the hydrocarbons?
a) Methane, ethane, propane and butane
b) Propane, butane, ethane and methane
c) Butane, ethane, propane and methane
d) Butane, propane, ethane and methane
Ans: a
144. In an atom, the order of filling up of
the orbitals is governed by
a) Aufbau principle
b) Heisenberg’s uncertainty principle
c) Hound’s rule
d) Pauli’s exclusion principle
Ans: a
145. Which one of the of following is NOT radioactive?
a) Astatine
b) Francium
c) Tritium
d) Zirconium
Ans: d
146. An aqueous solutions of copper Sulphate
is acidic in nature because the salt undergoes
a) Dialysis
b) Electrolysis
c) Hydrolysis
d) Photolysis
Ans: c
147. Considers the following statements with
reference to the periodic Table chemical elements:
1) Ionisation potential gradually decreases along a period
2) In a group of elements, electron affinity decreases as the
atomic weight increases.
3) In a given period, electronegativity decreases as the
atomic number increases
Which of these statements (s) is /are correct?
a) 1 only
b) 2 only
c) 1 and
3
d) 2 and 3
Ans: b
148. Which one of the following statements is
correct?
a) The boiling point of an aqueous
solutions is higher than that of pure water
b) Addition of solution to a solution
causes an increase I its water potential
c) The vapor pressure of the water in a
solution is lower than that of pure water
d) When a solution is separated from
water by a semi permeable membrane, water movement can be prevented by applying
pressure to the solution
Ans: a
149. Match List I (Oxidation number) with List II (The element) and select the
correct answer using the codes given below the lists
List I : List II
(Oxidation number) : (The element)
A. 2
: 1. Oxidation number of Mn in Mn o-2
B. 3 : 2. Oxidation number of S in
H_2S_2O_7
C. 4 : 3. Oxidation number of Ca in CaO
D. 6 : 4. Oxidation number of AI in
NaAIH_4
Codes:
A B
C D
a) 3
4 1 2
b) 4
3 1 2
c) 3
4 2 1
d) 4
3 2 1
Ans: a
150. Assertion (A) : Synthetic detergents can
lather well in hard water.
Reason (
R) Synthetic detergents form soluble
calcium and magnesium salts with hard water.
a) Both A and R are individually true
and R is the correct explanation of A
b) Both A and R are individually true but R is not a
correct explanation of A
c) A is true, but R is false
d) A is false, but R is true
Ans: a
151. Which
one of the following statement is correct?
a) a) Liquid
Sodium is employed as a coolant in nuclear reactors
b) b) Calcium
carbonate is an ingredient of tooth paste
c) c) Bordeaux
mixture conxsists of Sodium Sulphate and lime̤
d) d) Zinc
amalgams are used as a dental filling
Ans: b
152. Which one of the following is produced
during the formation of photochemical smog?
a) Hydrocarbons
b) Nitrogen Oxides
c) Ozone
d) Methane
Ans: c
153. With reference to ionic compounds,
consider the following statements:
1. Ionic compounds are insoluble in alcohol
2. Ionic compounds in the solid state are good conductors of
electricity.
Which of these statements is/are correct?
a) Only 1
b) Only 2
c) Both 1 and 2
d) Neither 1 nor 2
Ans: a
154. Which one of the following statements is
NOT correct?
a) a) The presence of Na CI increases the
rate of setting of plaster of pair
b) b) Gypsum is added to the cement to slow
down its rate of setting
c) c) All alkaliine earth metals from hydrated
salts
d) d) Barium and Strontium are found free
in nature
Ans: d
155. Consider the following statement:
The purpose of adding sodium Sulphate and sodium silicate to
the detergent in a washing powder is
1) to keep the washing
powder dry.
2) to maintain the alkalinity of the powder
Which of these statements is /are correct?
a) a) Only 1
b) b) Only 2
c) c) both 1 and 2
d) d) Neither 1 nor 2
Ans: b
156.
Assertion (A) :In the periodic table of chemical elements, electron
affinity is aways foud to increase from top to bottom in a group
Reason ( R) : In group, the atomic radii
generally increase from top to bottom.
a) Both A and R are individually true
and R is the correct explanation of A
b) Both A and R are individually true
but R is not the correct explanation of A
c) A is true but R is fasle
d) A is false but R is true
Ans: a
157. Assertion (A) Coal – based thermal power
stations contributed to acid – rain.
Reason ( R) : In group, thermal power staions
contribute to acid - rain
a) Both A and R are individually true and R is
the correct explanation of A
b) Both A and R are individually true
but R is not the correct explanation of A
c) A is true but R is fasle
d) A is false but R is true
Ans: b
158. .
Assertion (A) : Unsaturated fats are more reactive compared with the saturated
fats.
Reason ( R)
: Unsaturated fats have only single bonds in their structure.
a) Both A and R are individually true
and R is the correct explanation of A
b) Both A and R are individually true
but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Ans: c
159. Regarding the atom of a chemical element,
the magnetic quantum number refers to:
a) a) Orientation
b) b) Shape
c) c) Size
d) d) Spin
Ans: a
160. Consider the following statements:
1) Baking soda is used in fire extinguishers.
2) Quicklime is used in the manufacture
of glass.
3) Gypsum is used in the manufacture of plaster of Paris.
Which of the statements
given above is /are correct?
a) 1 and
2
b) 2 and
3
c) 1 only
d) 1, 2 and 3
Ans: b
161. Salts of which of the following elements
provide colors to fireworks?
a) Zinc and sulphur
b) Potassium and mercury
c) Strontium and barium
d) Chromium and nickel
Ans: c
162. Match List I (Fuel Gases) with List II
(Major Constituents) and select the correct answer using the codes given below
the Lists
List I : List II
( Fuel gases) (Major Constituents)
A. CNG : 1. Carbon monoxide,
B. Coal gas : 2. Butane, Propane
C. LPG : 3. Methane, Ethane
D. Water gas : Hydrogen, Methane, Carbon monoxide
Codes:
A B
C D
a) a) 2
1 3
4
b) b) 3
4 2 1
c) c) 2
4 3 1
d) d) 3
1 2 4
Ans: b
163. Standard 18 – carat gold sold in the
market contains
a) 82 parts gold and 18 parts other metals
b) 18 parts gold and 82 parts other
metals
c) 18 parts gold 6 parts other metals
d) 9 parts gold and 15 parts other metals
Ans: a
164. Consider the following statements:
1) Anhydrous sodium carbonate is commonly known as baking soda
2) Baking soda is used in fire
extinguishers
3) Bleaching powder is manufactured in
Hasenclever plant
Hasenclever plant
Which of the statements
given above is/are correct?
a) 1, 2 and 3
b) 2 and
3
c) 3 only
d) 1and
2
Ans: c
165. Assertion (A): The main constituent of
the Liquefied petroleum Gas is methane.
Reason ( R)
: Methane can be used directly for
burning in homes and factories where it can be supplied through
pipelines.
a) Both A and R are individually true
and R is the correct explanation of A
b) Both A and R are individually true
but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Ans: d
166. Which one of the following is the correct
sequence of the given substances in the decreasing order their densities?
a) a) Steel > Mercury <Gold
b) b) Gold > Mercury > Steel
c) c) Steel > Gold > Mercury
d) d) Gold > Steel > mercury
Ans: b
167. Consider the following chemicals:
1) Benzene
2) Carbon tetrachloride
3) Sodium Carbonate
4) Trichloroethylene
Which of the above is/are
dry cleaning chemicals?
a) 1 Only
b) 2 only
c) 1, 2 and 4 Only
d) 1, 2, 3 and 4
Ans: c
168. Which are the materials generally
employees as solder in soldering operation?
a) Iron and tin
b) Lead and tin
c) Aluminum and lead
d) Aluminum and iron
Ans: b
169. Which one among the following is called
philosopher’s wool?
a) Zinc bromide
b) Zinc nitrate
c) Zinc oxide
d) Zinc chloride
Ans: c
170. Which one of the following does not
contain silver?
a) Horn Silver
b) German silver
c) Ruby silver
d) Lunars glass
Ans: b
171. Which one of the following types of glass
can cut off ultraviolet rays?
a) a) Soda glass
b) b) Pyrex glass
c) c) Jena glass
d) d) Crooks glass
Ans: d
172. Which one of the following non-metals is
not poor conductor of electricity?
a) Sulphur
b) Selenium
c) Bromine
d) Phosphorus
Ans: b
173. Which one of the following is another
name of RDX?
a) Cyanohydrin
b) Selenium
c) Cyclohexane
d) Cyclonite
Ans: d
174. Which one of the following pairs of
metals constitutes the lightest metal and the heaviest metal, respectively?
a) a) Lithium and mercury
b) b) Lithium and osmium
c) c) Aluminum and osmium
d) d) Aluminum and mercury
Ans: b
175. Mixture of which one of the following
pairs of gases is the causes of occurrence of most of the explosions in mines?
a) a) Hydrogen and oxygen
b) b) Oxygen and acetylene
c) c)Methane and air
d) d) Carbon dioxide and methane
Ans: c
176. Which one of the following is also called
Strange Gas?
a) Argon
b) Neon
c) Xenon
d) Nitrous oxide
Ans: c
177. What are Rubies and Sapphires chemically
known as?
a) Silicon dioxide
b) Aluminum oxide
c) Lead tetroxide
d) Boron nitride
Ans: b
178. What is Biphenyl A (BPA)?
a) A Medical test for detecting cancer
b) A test for testing the use of drugs
to improve performance by athletes
c) A chemical used for the development
of food packaging materials
d) A special type of ally steel (CH-) C
(C-6H-4OH)-2
Ans: c
179. Which one for the following is used as an
explosive?
a) Phosphorus trichlride
b) Mercuric oxide
c) Graphite
d) Nitroglycerine
Ans: d
180. Ina dry cell (battery)., which of the
following are used as electrolytes?
a) Ammonium chloride and Zinc chloride
b) Sodium Chloride and Calcium chloride
c) Magnesium chloride and zinc chloride
d) Ammonium chloride and calcium
chloride.
Ans: a
181.
Chlorination is a process used for water purification The disinfecting action
of chlorine is mainly due to
a) The formation of hydrochloric acid
when chlorine is added to water
b) The formation of hypochlorus acid
when chlorine is added to water
c) The formation of nascent oxygen when
chlorine is added to water
d) The formation of hydrogen when
chlorine is added to water
Ans: c
182.
Consider the following:
1. Oxides of Hydrogen
2. Oxides of Nitrogen
3. Oxides of Sulphur
Which of the above causes
/causes acid rain?
a) 1 and 2 only
b) 3 only
c) 2 and 3 only
d) 1,2 and 3
Ans: c
183. Excessive release of the pollutant carbon
monoxide (CO) into the air may produce a condition in which oxygen supply to
the human body decreases. What causes this condition?
a) a) When inhaled into the human body, CO
is converted into CO-2
b) b) The inhaled CO has much higher
affinity for haemoglobin as compared to oxygen
c) c) The inhaled CO destroys the chemical
Structure of haemoglobin
d) d) The inhaled CO adversely affect he
respiratory center in the brain
Ans: b
184. A company marketing food products
advertises that its do not contain trans- fats what does this campaign signify to
the customers?
a) 1) The food products are not made cut of
hydrogenated oils.
b) 2) The food products are not made out of
animal fats/ oils
c) 3) The oils used are not likely to
damage the cardiovascular health of the
consummers.
Which of the statements
given above is /are correct?
a) 1 only
b) 2 and 3 only
c) 1 and 3 only
d) 1,2 and 3
Ans: c
185. The increasing amount of carbon dioxide in
the air is slowly raising the temperature of the atmosphere, because it absorbs
a) the water vapor of the air and
retains its heat
b) the UV part of the solar radiation
c) all the solar radiations
d) the infrared part of the solar radiation
Ans: d
186. Which one of the following sates of
elements was primarily responsible for the origin of life on the Earth?
a) a) Hydrogen, Oxygen, Sodium
b) b) Carbon, Hydrogen, Nitrogen
c) c) Oxygen, Calcium, phosphorus
d) d) Carbon, Hydrogen, Potassium
Ans: b
187. Lead. Ingested or inhaled, is a health
hazard. After the addition of lead of to petrol has been banned, what still are
the sources of lead poisoning?
1) Smelting units
2) Pens and pencils
3) Paints
4) Hair oils and cosmetics
Select the correct answer
using the codes given below:
a) 1, 2 and 3 only
b) 1 and 3 Only
c) 2 and 4 only
d) 1, 2, 3 and 4
Ans: a
188. Which of the following is/are the examples
/ examples of chemical change?
1) Crystallization of sodium chloride
2) Melting of ice
3) Souring of milk
Selected the correct answer
using the code given below.
a) 1 and 2 only
b) 3 only
c) 1, 2 and 3
d) None
Ans: b
O