SSC CGL 2015 : GENERAL SCIENCE

1. Which of the following characters is not shown by hydrogen —
(A) It burns in air to form water
(B) It supports combustion
(C) It combines with almost all metals forming hydrides
(D) It readily combines with fluorine and chlorine

2. The metallic constituents of hard water are —
(A) Magnesium, Calcium and tin
(B) Iron, tin and calcium
(C) Calcium, magnesium and iron
(D) Magnesium, tin and iron

3. The property of a substance to absorb moisture from the air on exposure is called —
(A) Osmosis
(B) Desiccation
(C) Efflorescence
(D) Deliquescene

4. Brass gets discoloured in air due to the presence of which gas in air —
(A) Carbon dioxide
(B) Oxygen
(C) Hydrogen Sulphide
(D) Nitrogen

5. Quartz crystals normally used in quartz clocks etc. is chemically —
(A) Sodium Silicate
(B) Silicon dioxide
(C) Germenium dioxide
(D) A mixture of (B) & (C)

6. Bell Metal is an alloy of —
(A) Brass and Nickel
(B) Zinc and Copper
(C) Tin and Copper
(D) Nickel and Copper

7. The high temperature superconductors are —
(A) Metal alloys
(B) Ceramic oxides
(C) Inorganic polymers
(D) Pure rare earth metals

8. The ingredients of Gun metal are —
(A) Iron, tin
(B) Copper, tin
(C) Iron, brass, tin
(D) Iron, zinc, titanium

9. The gas usually causing explosions in coal mines is —
(A) Hydrogen
(B) Carbon monoxide
(C) Air
(D) Methane

10. Cotton fibers are made of —
(A) cellulose
(B) starch
(C) proteins
(D) fats

ANSWER KEY:

1 - (B)

2 - (C)

3 - (D)

4 - (C)

5 - (B)

6 - (C)

7 - (B)

8 - (B)

9 - (D)

10- (A)