Chemistry questions and answers For UPSC | SSC | Rail | RRB | State PSC P15

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Page 15

90076141. Pasteurisation of milk means-

A

heating of milk to above 72°C

B

healing of milk to above 62°C

C

cooling of milk to about 62°C

D

cooling of milk to about 10°C

B

Correct Answer: B. healing of milk to above 62°C

90166142. Which gas does not form the part of the atmosphere?

A

Nitrogen

B

Helium

C

Chlorine

D

None of the above

C

Correct Answer: C. Chlorine

90044143. For determination of the age of which among the following is carbon dating method used?

A

Fossils

B

Rocks

C

Trees

D

A & B above

D

Correct Answer: D. A & B above

90135144. The photooxidation process is initiated by

A

light

B

heat

C

oxygen

D

catalyst

A

Correct Answer: A. light

90204145. Which type of glass is used for making glass reinforced plastic?

A

Pyrex glass

B

Flint glass

C

Quartz glass

D

Fibreglass

D

Correct Answer: D. Fibreglass

90182146. Which of the following Is used In making smoke bombs?

A

Sulphur

B

Phosphorus

C

Hydrogen

D

Carbon

D

Correct Answer: D. Carbon

90067147. Mortar is a mixture of water, sand and

A

Slaked lime

B

Quick lime

C

Limestone

D

Gypsum

A

Correct Answer: A. Slaked lime

90031148. Cream gets separated out of milk when it is churned. This is due to

A

gravitational force

B

centripetal force

C

centrifugal force

D

frictional force

C

Correct Answer: C. centrifugal force

90060149. In which of the following stales maximum iron ore is found ?

A

FeCO₃

B

Fe₂O₃

C

Fe₃O₄

D

FeS₂

B

Correct Answer: B. Fe₂O₃

90165150. Which among the following elements is found In maximum percentage in the human body?

A

Carbon

B

Hydrogen

C

Nitrozen

D

Oxyzen

D

Correct Answer: D. Oxyzen

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