General Science Practice Sets for WBCS, SSC, Rail, UPSC Exam P10

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Page 10

146291. An example of a scalar quantity is

A

Momentum

B

Energy

C

Velocity

D

Force.

B

Correct Answer: B. Energy
Explanation:

Energy is an example of a scalar quantity. Because it only has magnitude but has no direction.   

Energy = Force * Displacement 

Here both force and displacement are vector quantity but its multiplication is a scalar quantity.

155192. Some automobiles have additional yellow headlights. This is so because

A

Yellow light is able to penetrate fog, thus it is able to illuminate the road better in foggy nights.

B

The automobile looks more imposing with yellow headlights.

C

Yellow light consumes less power.

D

Yellow light does not produce a dazzling effect in the eyes of the pedestrians

A

Correct Answer: A. Yellow light is able to penetrate fog, thus it is able to illuminate the road better in foggy nights.

149593. The magnetic length of a bar magnet means

A

It's width

B

Its total length

C

The distance of a pole from the center

D

The distance between its two poles

D

Correct Answer: D. The distance between its two poles

151494. What is increased in the step-up transformer?

A

Wattage

B

Current density

C

Voltage

D

Current

C

Correct Answer: C. Voltage

156495. The material used for safety from nuclear radiation is

A

Iron

B

Lead

C

Copper

D

Platinum

B

Correct Answer: B. Lead

148396. When a body is lifted by hand, what type of work is performed by hand?

A

Third type of lever

B

Simple machine

C

First type of lever

D

Second type of lever.

A

Correct Answer: A. Third type of lever

161097. Which of the following is not a conservative force?

A

Electrostatic force.

B

Magnetostatic force.

C

Gravitational force.

D

Frictional force

D

Correct Answer: D. Frictional force

154698. Focussing in a camera is carried out by varying

A

The distance of the lens from the object.

B

The speed of the shutter.

C

The amount of light

D

The distance of the lens from the film

D

Correct Answer: D. The distance of the lens from the film

151799. Greenhouse effect causes

A

lowering in temp. of the earth.

B

continuous snowing on the earth.

C

rise in temperature of the earth.

D

continuous rainfall

C

Correct Answer: C. rise in temperature of the earth.

1569100. The image formed by a plane mirror is

A

virtual and erect

B

real and inverted

C

real and erect

D

virtual and inverted

A

Correct Answer: A. virtual and erect

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