WBCS General Knowledge on General Science (Physics) P3

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Page 3

153021. If the length and cross-section of a Wire are both doubled, the resistance will

A

Increase twice

B

Remain unchanged

C

Increase 4 times

D

Decrease 5 times

B

Correct Answer: B. Remain unchanged

158322. A magnifying glass or a simple microscope produces a

A

Magnified virtual image.

B

Diminished virtual image.

C

Magnified real image.

D

Virtual image near the eye, having the same size as the object

A

Correct Answer: A. Magnified virtual image.

255723. Which is not renewable resource?

A

energy of water

B

energy of sun

C

energy of earth

D

none of the above

D

Correct Answer: D. none of the above

151824. Two ends of a tube are closed by corks so that the tube become airtight. The pressure of air inside the closed tube is

A

Equal to the atmospheric pressure.

B

Dependent on the length of the tube.

C

Very small.

D

Slightly less than the atmospheric pressure

A

Correct Answer: A. Equal to the atmospheric pressure.

254625. What is the audible range [hearing range] of humans?

A

20 Hz 20000 Hz

B

80 Hz 100Hz

C

2 lac Hz 4 lac Hz

D

0 Hz 20 Hz

A

Correct Answer: A. 20 Hz 20000 Hz

147826. A watch based on an oscillating spring is taken from the earth to the moon. It will -

A

Give the same time

B

Stop altogether

C

Run slow

D

Run fast.

C

Correct Answer: C. Run slow

146827. A piece of a metal plate with a circular hole is heated. If the metal plate expands on heating, the diameter of the hole will

A

Increase or decrease depending on the diameter of the hole.

B

Increase or decrease depending upon the metering of the plate

C

increase

D

Decrease.

C

Correct Answer: C. increase

157928. The current on a 100W, 200V electric bulb is

A

0.5 amp

B

22000 amp

C

2.2 amp

D

2.3 amp

A

Correct Answer: A. 0.5 amp

155629. Basically domestic electric wiring is a

A

Combination of series and parallel connections.

B

Series connection

C

Parallel connection

D

None of the above

C

Correct Answer: C. Parallel connection

152130. Mass of a body is defined by the following quantity

A

Applied force / acceleration

B

Applied force / increase in momentum

C

Velocity / acceleration

D

Applied force / velocity

A

Correct Answer: A. Applied force / acceleration

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