Physics Questions

Q:

A person holding a pen in his left hand sees his reflection in the mirror holding the pen in his right hand. This is due to which of the following phenomena?

A) Diffused reflection B) Total internal reflection
C) Lateral inversion D) Refraction
 
Answer & Explanation Answer: C) Lateral inversion

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Q:

The instrument used for measuring air pressure is called .....

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

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Q:

What is the value of acceleration due to gravity at the centre of earth?

A) -1 B) 0
C) 1 D) Infinity
 
Answer & Explanation Answer: B) 0

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Q:

Which type of electromagnetic radiation has the longest wavelength?

A) UV rays B) Radio waves
C) X rays D) Infrared waves
 
Answer & Explanation Answer: B) Radio waves

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Q:

A spoon which looks bent is an example of which of the following?

A) Reflection B) Refraction
C) Retention D) Focus
 
Answer & Explanation Answer: B) Refraction

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Q:

Find the kinetic energy (in J) possessed by a body of mass 10 kg moving with a velocity of 5 m/s.

A) 25 B) 125
C) 62.5 D) 50
 
Answer & Explanation Answer: B) 125

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Q:

The absolute refractive index of air is

A) 1.03 B) 1.00003
C) 1.003 D) 1.0003
 
Answer & Explanation Answer: D) 1.0003

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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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