Physics Questions

Q:

Resistance switching is normally employed in

A) Bulk oil breakers B) All breakers
C) Air blast circuit breakers D) Minimum oil breakers
 
Answer & Explanation Answer: C) Air blast circuit breakers

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Q:

Which of the following waves cannot be polarised?

A) Radio B) Ultra violet
C) Infrared D) Ultrasonic
 
Answer & Explanation Answer: D) Ultrasonic

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Q:

A broadcasting station transmits waves with a frequency of 71 x 104 Hz and a speed of 3 x 108 m/s. The wavelength of the wave is

A) 324.6 m B) 422.5 m
C) 208.4 m D) 418.8 m
 
Answer & Explanation Answer: B) 422.5 m

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Q:

In hydel power station, the motion produced in turbines is due to

A) flow of water B) burning of coal
C) burning of diesel D) production of steam
 
Answer & Explanation Answer: A) flow of water

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Q:

A car accelerates uniformly from 18 kmph to 72 kmph in 5 s. The acceleration of the car (in m/sq.s) is:

A) 3 B) 5
C) 6 D) 7
 
Answer & Explanation Answer: A) 3

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Q:

When a number of resistors are connected in series in a circuit, the value of current:

A) increases B) becomes half
C) decreases D) remains the same
 
Answer & Explanation Answer: D) remains the same

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Q:

Which instrument is used for measuring humidity of atmosphere?

A) Barometer B) Anemometer
C) Thermometer D) Hygrometer
 
Answer & Explanation Answer: D) Hygrometer

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Q:

If speed of rotation of the earth increases, the weight of the body

A) decreases B)
C) D)
 
Answer & Explanation Answer: A) decreases

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