Physics Questions

Q:

The rate of change of linear momentum of a body is proportional to the ___________ acting on it.

A) impulse B) torque
C) force D) kinetic energy
 
Answer & Explanation Answer: C) force

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Q:

_________________ through a plane surface is the product of the magnetic flux density normal to the surface and the area of the surface.

A) Magnetic susceptibility B) Magnetic resonance
C) Magnetic flux D) Magnetic pulse
 
Answer & Explanation Answer: C) Magnetic flux

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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:

What is the power rating (in W) of a bulb if a current of 0.3 A passes through on application of 240 V of potential difference across its terminals?

A) 800 B) 36
C) 400 D) 72
 
Answer & Explanation Answer: D) 72

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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:

The side mirrors of vehicles are of which type of mirrors?

A) Convex B) Concave
C) Plane D) Inverted
 
Answer & Explanation Answer: A) Convex

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