General Science (Chemistry) MCQ For Competitive Exam P21

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Page 21

90132201. The natural source of hydro-ear-boil is

A

Crude oil

B

Biomass

C

Coal

D

Carbohydrates

A

Correct Answer: A. Crude oil

90027202. Cement is usually a mixture of

A

Calcium silicate and calcium aluminate

B

Calcium silicate and calcium ferrate

C

Calcium aluminate and calcium ferrate

D

Limestone and silicon dioxide

A

Correct Answer: A. Calcium silicate and calcium aluminate

90124203. The material used in solar cells contains

A

Tin

B

Silicon

C

Caesium

D

Thallium

B

Correct Answer: B. Silicon

90144204. The temperature of the oxy-acetylene flame is around

A

2800°C

B

3200°C

C

4000°C

D

1500°C

B

Correct Answer: B. 3200°C

90082205. Quartz is made of

A

Calcium Sulphate

B

Calcium Silicate

C

Sodium Sulphate

D

Sodium Silicate

D

Correct Answer: D. Sodium Silicate

90079206. Plaster of Paris' is made by partial dehydration of

A

Epsom sal

B

gypsum salt

C

blue vitriol

D

green vitriol

B

Correct Answer: B. gypsum salt

90008207. Among the following, which is always found in free-state in nature?

A

Gold

B

Silver

C

Sodium

D

Copper

A

Correct Answer: A. Gold

90130208. The most commonly used chemicals in artificial rainmaking or cloud seeding are

A

Silver Iodide (Ag I)

B

Sodium Chloride (NaCI)

C

Dry Ice (Frozen CO₂)

D

All of the above

A

Correct Answer: A. Silver Iodide (Ag I)

90171209. Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpaste?

A

Borax

B

Saltpetre

C

Hydrogen peroxide

D

Sodium chloride

D

Correct Answer: D. Sodium chloride

90072210. One of the constituents of tear gas is

A

Ethane

B

Ethanol

C

Ether

D

Chloropicrin

D

Correct Answer: D. Chloropicrin

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