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 Physics Questions

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Q:

Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is

A) of variable refractive index B) made up of slabs of different refractive indices
C) homogeneous and transparent D) inhomogeneous and transparent
 
Answer & Explanation Answer: C) homogeneous and transparent

Explanation:

In vacuum and in homogeneous, transparent media, such as air, water, and glass, light moves in a straight line. When light encounters a boundary between two different transparent media, some light is reflected and some moves from the first into the second medium.

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1 1894
Q:

Which mirror is used as rear view mirror in vehicles?

A) Concave B) Plane
C) Convex D) Any of the above
 
Answer & Explanation Answer: C) Convex

Explanation:

Convex mirror is used as rear view mirror in vehicles. Because the image is smaller, more image can fit onto the mirror, so a convex mirror provides for a larger field of view than a plane mirror. This is why they are useful.

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5 1893
Q:

Which type of radiation has the lowest penetrating ability?

A) Alpha B) Beta
C) Gamma D) All of the above
 
Answer & Explanation Answer: A) Alpha

Explanation:

In order of increasing penetration power, alpha particles have the lowest, then beta particles, then gamma rays.

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3 1892
Q:

Find the current (in A) when a charge of 500 Coulomb flows in 25 seconds.

A) 12500 B) 20
C) 40 D) 6250
 
Answer & Explanation Answer: A) 12500

Explanation:
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3 1890
Q:

The quality or tone of a musical sound produced by a stringed instrument depends on

A) frequency of vibration B) length of the strings in the instrument
C) Amplitude of vibration D) waveform of the sound
 
Answer & Explanation Answer: D) waveform of the sound

Explanation:
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4 1886
Q:

When a ball is thrown vertically upwards, which of the following quantities remains constant during its motion?

A) Energy B) Displacement
C) Velocity D) Acceleration
 
Answer & Explanation Answer: A) Energy

Explanation:
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2 1885
Q:

If price of an article decreases from Rs 240 to Rs 220, when quantity demanded increases from 200 units to 210 units. Find point elasticity of demand?

A) 0.6 B) -1.8
C) -0.6 D) 1.8
 
Answer & Explanation Answer: C) -0.6

Explanation:
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0 1884
Q:

What type of electromagnetic radiation is used in the remote control of a television?

A) Ultraviolet B) Visible
C) Infrared D) None of the above
 
Answer & Explanation Answer: C) Infrared

Explanation:
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5 1883