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Q:

If I is the current through a wire and e is the charge of an electron, then the number of electrons crossing in t seconds will be given by

A) e/It B) It/e
C) Ie/t D) Ite
 
Answer & Explanation Answer: B) It/e

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Q:

What will be the value of the kinetic energy (Ek) of a moving body with mass m, if its speed is doubled from v to 2v?

A) 1/2 Ek B) 4 Ek
C) There will be no change in Ek D) 2 Ek
 
Answer & Explanation Answer: B) 4 Ek

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Q:

The force of friction between two surfaces will increase if:

A) a layer of lubricant is kept between the two surfaces B) the two surfaces are pressed harder
C) air gap is created between the two surfaces D) irregularities on both the surfaces are removed
 
Answer & Explanation Answer: B) the two surfaces are pressed harder

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Q:

Which of the following is a Non-Luminous body?

A) Glowing bulb B) Moon
C) Burning candle D) Firefly
 
Answer & Explanation Answer: B) Moon

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Q:

What is the effective resistance (in Ω) of two resistors 12 Ω and 24 Ω connected in parallel?

A) 36 B) 8
C) 16 D) 72
 
Answer & Explanation Answer: B) 8

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Q:

The velocity of light in vacuum is

A) 3 x 108 m/s B) 2 x 108 m/s
C) 3 x 107 m/s D) 3 x 106 m/s
 
Answer & Explanation Answer: A) 3 x 108 m/s

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Q:

A ball of 0.1 kg is dropped from rest. When it falls through a distance of 2 m, the work done by the force of gravity is

A) 0.98 J B) -0.98 J
C) 1.96 J D) -1.96 J
 
Answer & Explanation Answer: C) 1.96 J

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Q:

Echocardiogram is more closely related to

A) Doppler effect B) Zeeman effect
C) Photoelectric effect D) Magnetic effect
 
Answer & Explanation Answer: A) Doppler effect

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