Important MCQ on General Science Chemistry P27

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Page 27

90151261. Vulcanization of rubber is carried out by adding

A

Sulphur

B

Carbon

C

Ozone

D

Phosphorus

A

Correct Answer: A. Sulphur

90154262. What are the major pollutants of cigarette smoke?

A

Carbon monoxide and dioxin

B

Carbon monoxide and nicotine

C

Carbon monoxide and benzene

D

Dioxin and benzene

B

Correct Answer: B. Carbon monoxide and nicotine

90119263. The iron ore which contains 72% of iron is

A

Magnetite

B

Limonite

C

Haematite

D

Siderite

A

Correct Answer: A. Magnetite

90118264. The hardest allotrope of carbon is

A

diamond

B

graphite

C

coke

D

lamp black

A

Correct Answer: A. diamond

90120265. The isotope of Uranium used in atomic reactors is

A

U-235

B

U-236

C

U-237

D

U-232

A

Correct Answer: A. U-235

90032266. Denatured spirit is ethanol mixed with

A

Petrol

B

Kerosene

C

Water

D

Pyridine

D

Correct Answer: D. Pyridine

90034267. Detergents clean surfaces on the principle of

A

viscosity

B

surface tension

C

elasticity

D

floatation

B

Correct Answer: B. surface tension

90205268. Which variety of coal contains recognisable traces of the original plant material?

A

Anthracite

B

Lignite

C

Peat

D

Bitumen

C

Correct Answer: C. Peat

90081269. Quartz is a crystalline form of

A

Alumina

B

Glass

C

Silica

D

Limestone

C

Correct Answer: C. Silica

90157270. What is the chemical name of 'Baking Soda'?

A

Sodium carbonate

B

Sodium bicarbonate

C

Sodium nitrite

D

Sodium nitrate

B

Correct Answer: B. Sodium bicarbonate

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