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Q:

An object having a mass 'm' moving with a velocity 'v' possesses a kinetic energy 'K'. If its velocity is doubled, its kinetic energy will become:

A) K/2 B) 2K
C) 4K D) K/4
 
Answer & Explanation Answer: C) 4K

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Q:

Which object converts electricity to light?

A) Solar panels B) Battery
C) Bulb D) All the above
 
Answer & Explanation Answer: C) Bulb

Explanation:

Bulb converts electricity to light whereas solar panel is the device which converts light to electricity.

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Q:

For what is Mohs scale used?

A) To measure brightness of a substance B) To measure viscosity of a liquid
C) To measure elasticity of a material D) To measure hardness of minerals
 
Answer & Explanation Answer: D) To measure hardness of minerals

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Q:

Which type of electromagnetic radiation has the shortest wavelength?

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

Explanation:

The order of wavelengths of electromagnetic spectrum is as follows ::

(Shortest to Longest) - Gamma, X-Rays, UV, Visible, Infrared, Microwaves, Radio Waves.

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Q:

If the velocity of a body becomes two times its initial velocity, its kinetic energy becomes n times its initial kinetic energy. What is the value of n?

A) 4 B) 6
C) 1/2 D) 3
 
Answer & Explanation Answer: A) 4

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Q:

A ball, thrown vertically upward, rises to a height of 80 m and returns to its original position. The magnitude of its displacement after 7 s of motion will be ____. (take g = 10 m/s2)

A) 35 m B) 25 m
C) 45 m D) 125 m
 
Answer & Explanation Answer: A) 35 m

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Q:

Two particles with charges q1 and q2 are kept at a certain distance to exert force F on each other. If the distance is reduced to one-fifth, then the force between them is

A) F/25 B) 5F
C) F/5 D) 25F
 
Answer & Explanation Answer: D) 25F

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Q:

The sensation of sound persists in the human brain for about:

A) 0.5 sec B) 0.2 sec
C) 0.1 sec D) 1 sec
 
Answer & Explanation Answer: C) 0.1 sec

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