PSC Online Preparations of General Science (Physics) P15

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Page 15

1494141. The only vector quantity among the following is

A

Electric field intensity

B

Electric resistance

C

Electric charges

D

Electric potential

A

Correct Answer: A. Electric field intensity

2555142. The density of milk is measured by

A

lactometer

B

hydrometer

C

barometer

D

hygrometer

A

Correct Answer: A. lactometer

2548143. Lightning can even burn a tree because it contains tremendousamount of

A

heat energy

B

electric energy

C

chemical energy

D

nuclear energy

B

Correct Answer: B. electric energy

1573144. The heat required to raise the temperature of a body by 1°K is called

A

Water equivalent

B

Thermal capacity

C

Specific heat

D

None of the above

B

Correct Answer: B. Thermal capacity

1588145. Red is used as a danger signal because

A

red colour is easily available.

B

red colour is soothing for the eye.

C

blood is red.

D

red light is scattered least by the air molecules

D

Correct Answer: D. red light is scattered least by the air molecules

1570146. One important difference between light and sound is that the former

A

Can bend around corners

B

Can travel through space

C

Is a wave motion

D

Can be reflected

B

Correct Answer: B. Can travel through space

1612147. Glass is best described as

A

A eutectic mixture

B

A supercooled solution

C

A gel

D

An alloy

B

Correct Answer: B. A supercooled solution

1563148. The specific resistance of a conductor depends on its

A

Temperature

B

The shape of the cross-section

C

Length

D

Width

A

Correct Answer: A. Temperature

1527149. The kinetic energy of molecules is highest in

A

Liquids

B

Solutions

C

Gases

D

Solids

C

Correct Answer: C. Gases

1498150. How many times will the equivalent resistance of n identical conductors be changed if their parallel arrangement is changed into a series one

A

n

B

n²

C

n³

D

n⁴

B

Correct Answer: B. n²

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