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 Physics Questions

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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:

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:

A person does some work of 1,000 J in 2 s. His power will be ......

A) 1000W B) 25W
C) 500W D) 50W
 
Answer & Explanation Answer: C) 500W

Explanation:
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Q:

Electrical Energy is the energy of

A) Protons B) Neutrons
C) Electrons D) All the above
 
Answer & Explanation Answer: C) Electrons

Explanation:

We know that Kinetic energy is the energy of a moving object and in the same way Electrical energy is the form of kinetic energy caused by moving electric charges called electrons.

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Q:

For photoelectric effect to take place, the metal used as the cathode should have_________

A) high melting point B) low melting point
C) Low work function D) low resistance
 
Answer & Explanation Answer: C) Low work function

Explanation:
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Q:

Which of the following is not a unit of energy?

A) Calorie B) Joule
C) electron volt D) Watt
 
Answer & Explanation Answer: D) Watt

Explanation:

The watt(symbol: W) is a unit of power. In the International System of Units (SI) it is defined as a derived unit of 1 joule per second, and is used to quantify the rate of energy transfer. In dimensional analysis it is described by

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Q:

A person lifts luggage of 20 kg from the ground and puts it on his head 2 in above the ground. Calculate the work done by him. (g = l0 )

A) 20 J B) 400J
C) 200J D) 40J
 
Answer & Explanation Answer: B) 400J

Explanation:
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Q:

Intensity of any wave is proportional to which of the following?

A) amplitude B) Square of amplitude
C) Square root of amplitude D) Cube of amplitude
 
Answer & Explanation Answer: B) Square of amplitude

Explanation:
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