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 Physics Questions

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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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Q:

If the mass of an object is 60 kgs, what will be its weight on the moon? (N=Newton)

A) 60N B) 600N
C) 100N D) 10N
 
Answer & Explanation Answer: C) 100N

Explanation:
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Q:

In science a push or pull of an object is called ________.

A) Pick B) Lift
C) Force D) Shut
 
Answer & Explanation Answer: C) Force

Explanation:
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Q:

Which of the following never occurs singly in nature?

A) Inertia B) Momentum
C) Force D) Velocity
 
Answer & Explanation Answer: C) Force

Explanation:
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Q:

Physical quantities, which have _______ only and no _______ are called scalar quantities.

A) direction, magnitude B) magnitude, direction
C) speed, velocity D) velocity, speed
 
Answer & Explanation Answer: B) magnitude, direction

Explanation:
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Q:

Bandwidth is the

A) a measure of the width of a range of frequencies B) the rate of data transfer
C) both a & b D) None of the above
 
Answer & Explanation Answer: C) both a & b

Explanation:
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Q:

In total internal reflection, the light travel from

A) rarer to denser medium and it occurs with no loss of intensity B) denser to rarer medium and it occurs with no loss of intensity
C) rarer to denser medium and it occurs with loss of intensity D) denser to rarer medium and it occurs with loss of intensity
 
Answer & Explanation Answer: B) denser to rarer medium and it occurs with no loss of intensity

Explanation:

According to wave theories, for Total internal reflection tohappen: Light must travel from denser medium to rarer medium. Angle of incidence should be greater than critical angle. As in case of TIR, the image is perfectly clear, it implies that there has been no loss of intensity.

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Q:

A   parallel-plate   capacitor,with   air   in between  the  plates,  has  capacitance  C. Now  the  space  between  the  two  plates  of the  capacitor  is  filled  with  a  dielectric  of dielectric constant 7. Then the value of the capacitance will become

A) C B) C/7
C) 7C D) 14C
 
Answer & Explanation Answer: C) 7C

Explanation:

As  the  capacitance  is  charged  by the  factor  equal  to  the  value  of dielectric constant, Hence, C’ = kC = 7C

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