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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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Q:

When a ray of light travels from a denser medium to a rarer medium, it bends

A) towards the normal and speeds up B) towards the normal and slows down
C) away from the normal and speeds up D) away from the normal and slows down
 
Answer & Explanation Answer: C) away from the normal and speeds up

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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:

Rectifiers convert _____.

A) high voltage to low voltage B) low voltage to high voltage
C) AC to DC D) DC to AC
 
Answer & Explanation Answer: C) AC to DC

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Q:

The given symbol stands for a/an ___ in an electric circuit.

A) resistor B) plug key
C) electric bulb D) battery
 
Answer & Explanation Answer: C) electric bulb

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Q:

When a bullet is fired from a gun, the gun moves in the opposite direction. This illustrates Newton's

A) third law of motion B) first and second law of motion
C) first law of motion D) second law of motion
 
Answer & Explanation Answer: A) third law of motion

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Q:

Due to an acceleration of 1 m/s2 the velocity of a body increases from 15 m/s to 20 m/s in a certain period. Find the displacement (in m) of the body in that period.

 

A) 175 B) 625  
C) 87.5 D) 312.5
 
Answer & Explanation Answer: C) 87.5

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Q:

Which of the following is NOT based on principle of relationship between volume and pressure of air?

A) Fountain pen B) Bicycle pump
C) Hand pump D) Pulley
 
Answer & Explanation Answer: D) Pulley

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