class 10 Chemistry mcq questions pdf For UPSC | SSC | Rail | RRB | State PSC P18

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Page 18

90158171. What is the element required for solar energy conversion?

A

Beryllium

B

Tantalum

C

Silicon

D

Ultra pure carbon

C

Correct Answer: C. Silicon

90084172. Seawater can be purified by the process of

A

distillation

B

evaporation

C

filtration

D

fractional distillation

A

Correct Answer: A. distillation

90083173. Radioactive disintegration of uranium ultimately results in the formation of

A

radium

B

thorium

C

polonium

D

lead

D

Correct Answer: D. lead

90128174. The most abundant element in the human body is

A

carbon

B

iron

C

nitrogen

D

oxygen

D

Correct Answer: D. oxygen

90137175. The process of removing calcium and magnesium from hard water is known as

A

Sedimentation

B

Filtration

C

Flocculation

D

Water softening

D

Correct Answer: D. Water softening

90022176. Bronze is an alloy of

A

Copper and Zinc

B

Tin and Zinc

C

Copper and Tin

D

Iron and Zinc

C

Correct Answer: C. Copper and Tin

90196177. Which one of the following is used to restore the colour of old oil paintings?

A

Ozone

B

Hydrogen peroxide

C

Barium peroxide

D

Sodium peroxide

B

Correct Answer: B. Hydrogen peroxide

90109178. The element used in the manufacture of safety matches is

A

Phosphorous

B

Magnesium

C

Silicon

D

Sulphur

A

Correct Answer: A. Phosphorous

90175179. Which of the following gases is present under pressure in soft drinks?

A

Oxygen

B

Nitrogen

C

Carbon dioxide

D

Nitrous oxide

C

Correct Answer: C. Carbon dioxide

90035180. Detergents used for cleaning clothes and utensils contain

A

nitrates

B

bicarbonates

C

sulphonates

D

bismuthates

C

Correct Answer: C. sulphonates

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