General Science (Chemistry) Practice Sets For WBCS Prelims P2

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Page 2

162311. A substance used in metallurgy to remove rock material is called

A

flux

B

gangue

C

matrix

D

slag

A

Correct Answer: A. flux

162412. The compound that can not be kept in glass vessel because it reacts with glass is

A

HF

B

FIBr

C

HNO₃

D

HCI

A

Correct Answer: A. HF

162513. Whose presence in drinking water is welcome?

A

As

B

Fe

C

K

D

Ca

C

Correct Answer: C. K

162614. Phosgene is a common name of

A

Phosphine

B

Carbonyl chloride

C

Phosphorus trichloride

D

Phosphorus oxychloride

B

Correct Answer: B. Carbonyl chloride

162715. The purest form of iron is

A

Iron turning

B

Cast iron

C

Wrought iron

D

Stainless steel

C

Correct Answer: C. Wrought iron

162816. Radioactive decay of uranium produces

A

Lead

B

Tin

C

Arsenic

D

Bismuth

A

Correct Answer: A. Lead

162917. Washing soda is the common name for

A

Sodium bicarbonate

B

Sodium hydroxide

C

Sodium carbonate

D

Calcium carbonate

C

Correct Answer: C. Sodium carbonate

163018. In the process of vulcanization which two of the following are heated together?

A

Rubber and Steel

B

Rubber and Lead

C

Rubber and Sulphur

D

Latex and Sulphur

C

Correct Answer: C. Rubber and Sulphur

163119. When a liquid is heated from 20°C to 60°C, its density

A

Decreases

B

Is lost

C

Remains the same

D

Increases

A

Correct Answer: A. Decreases

163220. Equal volumes of different gases at any definite temperature and pressure have

A

equal density

B

equal number of molecules

C

equal weights

D

equal masses

B

Correct Answer: B. equal number of molecules

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