Physics Questions

Q:

If an object moves in a purely rotatory motion, then each constituent particle of the body moves in a circle, the centre of which is located on a line is called _______.

A) the axis of rotation B) the line of rotation
C) the spinning rod D) the fixed line
 
Answer & Explanation Answer: A) the axis of rotation

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Q:

Magnetic striping is evidence of

Answer

Magnetic striping is evidence of seafloor spreading.

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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:

Which rays cause skin damage?

A) X­-Rays B) UV Rays
C) Infra red rays D) Yellow Rays
 
Answer & Explanation Answer: B) UV Rays

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Q:

______ is the perpendicular distance between point of application of force and axis of rotation.

A) Moment arm B) Moment of Inertia
C) Altitude D) Base
 
Answer & Explanation Answer: A) Moment arm

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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:

The area under a Velocity-Time graph represents ______________.

A) distance B) acceleration
C) force D) momentum
 
Answer & Explanation Answer: A) distance

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Q:

Instrument used for measuring specific gravity is called _____.

A) Bathymeter B) Cryometer
C) Areometer D) Cymometer
 
Answer & Explanation Answer: C) Areometer

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