1. The
bell metal is an alloy of-
(a) Nickel and copper
(b) Zinc and
copper-
(c) Tin and copper
(d) Tin and
aluminum
(e) Brass and
nickel
Answer. (c)
2. Parsec is a measure of-
(a) Brightness of heavenly body
(b) Astronomical distance
(c) Density of stars
(d) Orbital
velocity of
giant stars
Answer. (d)
3. By fixation of nitrogen is meant-
(a) Manufacture of nitrogen
(b) Liquefication of nitrogen
(c) Conversion of
nitrogen into
nitric acid
(d) Conversion of atmospheric nitrogen into
Useful compounds
Answer. (d)
4. Atoms of
the
same element, i.
e., having the
Same
atomic number
that differ in atomic Weight,
are called-
(a) Isotopes
(b) Isomers
(c) Isobars
(d) Isohytes
Answer. (a)
5. The quantum number that tends to specify The orientation in space
for an orbital is the-
(a)
Principal
quantum number
(b) Orbital
quantum number
(c) Magnetic quantum number
(d)
Spin quantum number
Answer.
(c)
6. Carbohydrates are the
compounds of-
(a) Carbon and hydrogen
(b) Carbon, oxygen and hydrogen
(c) Carbon, oxygen, hydrogen and nitrogen
(d) Carbon,
nitrogen and hydrogen
Answer. (b)
7. The
tides in the ocean are
due
to-
(a) Wind over
the oceans
(b) Gravitational pull
of the moon
(c) Rotation of
the earth
(d) Revolution of the
earth
Answer. (b)
8. When water
freezes its density-
(a) Increases
(b) Decreases
(C) remains constant
(d)
Becomes zero
Answer. (b)
9. A chemical
reaction that takes place with
the evolution of heat is called a/an-
(a) Reversible reaction
(b)
Endothermic reaction
(c)
Thermal reaction
(d) Exothermic reaction
Answer. (d)
10. The manufacture
of iron ore Involves the
process of-
(a)
Oxidation
(b) Reduction
(c) Fractional
distillation
(d) Electrolysis
Answer. (b)
11. A double convex air bubble
in
water would Behave as a-
(a) Convergent lens
(b) Divergent lens
(c) Both
as
convergent and
divergent lenses
(d) None
of them
Answer. (b)
12. Which of the following has the
strongest Bleaching property?
(a) Chlorine
(b) Fluorine
(c) Bromine
(d)
Iodine
Answer. (a)
13. The most abundant element in the
earth’s Crust is-
(a) O
(b) Al (c) Si (d) Fe
Answer. (a)
14. Which of the following gases do not
form Part of
the
atmosphere?
(a) Nitrogen
(b) Chlorine
(c) Carbon dioxide
(d) Oxygen
Answer. (b)
15. Nitric acid
does
not react with-
(a) Copper (b) Gold
(c) Silver (d) Zinc
Answer. (b)
16. Oxygen is manufactured by the fractional Evaporation of-
(a)
Water
(b) Liquid air
(c) Hydrogen peroxide
(d)
Liquid oxygen
Answer. (b)
17. Sodium burns in air to give-
(a) Sodium peroxide
(b)
Sodium hydroxide
(c)
Sodium monoxide
(d) Sodium oxide
and
sodium nitride
Answer. (a)
19. Argon gas was discovered by-
(a) William Ramsay
(b) Charles
(c) Cavendish
(d)
John Davy
Answer.
(A)
19. Formaldehyde is the starting material for the manufacture
of-
(a) D. D. T.
(b) Rayon
(c) Bakelite
(d) Caprolactam
Answer. (c)
20. During burnings of
fuels, carbon and Hydrogen present in the fuels are-
(a) Converted
into carbon dioxide and Water vapour
(b) Released
into
the
atmosphere
(c)
Absorbed by the surroundings
(d) Converted into
alkanes
Answer. (a)
21. Dry ice
is-
(a) Ice
which
never melts
(b) A
term used for insensitive persons
(c) Solid
carbon dioxide
(d) Frozen heavy water
Answer. (c)
22. The compound
which can be
used to Prepare iodoform is-
(a) Accetic acid
(b) Methyl
iodide
(c) Acetone
(d) Propionaldehyde
Answer. (c)
23. The phenomenon of “metamerism” is Shown by-
(a) Acetone and
Propionaldehyde
(b) Methyl
propylether and
diethyl ether
(c) Ethyl
alcohol and dimethyl
ether
(d) Propionic acid and acetic acid
Answer. (b)
24. If two liquids have widely different boiling Points, they may be
separated
by-
(a) Steam distillation
(b) Decantation
(c) Evaporation
(d) Fractional
distillation
Answer. (d)
25. What is laughing gas?
(a) Carbon dioxide
(b) Sulphur dioxide
(c) Nitrous oxide
(d) Hydrogen peroxide
Answer. (c)
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