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 Physics Questions

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Q:

The atomic bomb is based on the principle of

A) Uncontrolled nuclear fusion B) Uncontrolled nuclear fission
C) Controlled nuclear fission D) Controlled nuclear fusion
 
Answer & Explanation Answer: B) Uncontrolled nuclear fission

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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:

Which instrument is used for measuring humidity of atmosphere?

A) Barometer B) Anemometer
C) Thermometer D) Hygrometer
 
Answer & Explanation Answer: D) Hygrometer

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Q:

Which of the following is a renewable source of energy?

A) Coal B) Petroleum
C) Plant D) Natural Gas
 
Answer & Explanation Answer: C) Plant

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Q:

A raised hammer possesses

A) Kinetic energy B) Mechanical energy
C) Muscular energy D) Potential energy
 
Answer & Explanation Answer: D) Potential energy

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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:

A galvanometer can be converted to a voltmeter by connecting

A) a high resistance in parallel B) a high resistance in series
C) a low resistance in series D) a low resistance in parallel
 
Answer & Explanation Answer: B) a high resistance in series

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Q:

Which one among the following is not an electro­magnetic wave?

A) X­-Ray B) R­-Ray
C) Cathode Ray D) Infrared Ray
 
Answer & Explanation Answer: C) Cathode Ray

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