WBCS Prelims and Mains MCQs on General Science (Chemistry) P7

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Page 7

167361. X-ray fails to pass through

A

Iron

B

Gold

C

Flesh

D

Bone

D

Correct Answer: D. Bone

167462. The Greenhouse effect gases trap only the heat of following radiations

A

Solar

B

Ultraviolet

C

Both A and B

D

Infrared

D

Correct Answer: D. Infrared

167563. Fullerene is

A

Artificial emery

B

A compound of carbon

C

An allotrope of carbon

D

A synonym for carborundum

C

Correct Answer: C. An allotrope of carbon

167664. Blood hemoglobin contains the metal

A

Copper

B

Iron

C

Aluminum

D

Magnesium

B

Correct Answer: B. Iron

167765. In 1775 a scientist experimentally showed that air consists of two gases. The name of the scientist is

A

Darwin

B

Davy

C

Priestley

D

Lavoisier

C

Correct Answer: C. Priestley

167866. Milk is an example of

A

emulsion

B

gel

C

suspension

D

solution

A

Correct Answer: A. emulsion

167967. The resistance of which of the following decreases with the rise of temperature?

A

Silicon

B

Mercury

C

Copper

D

Iron

A

Correct Answer: A. Silicon

168068. Which of the following processes makes direct use of oxygen?

A

Citric Acid Cycle

B

Electron transport

C

Glycolysis

D

Fermentation

B

Correct Answer: B. Electron transport

168169. Which one of the following is in the mixture of sympathetic ink?

A

Magnesium chloride and water

B

Zinc chloride and water

C

Cobalt chloride and water

D

None of the above

C

Correct Answer: C. Cobalt chloride and water

168270. Normal saline is an aqueous solution of sodium chloride of strength

A

1.00 molar

B

1

C

0.84%

D

1.00 normal

C

Correct Answer: C. 0.84%

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