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 Physics Questions

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Q:

Where is a transistor most likely to be found ?

A) Wrist watch B) Fuse
C) Hearing aid D) Fluorescent lamp
 
Answer & Explanation Answer: C) Hearing aid

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Q:

The value of acceleration due to gravity (g) at a distance of 2R from the surface of earth, where R is the radius of earth is ______.

A) g/3 B) g/4
C) g/9 D) g/2
 
Answer & Explanation Answer: C) g/9

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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

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Q:

Supercooling is cooling of liquid _____.

A) below melting point B) below freezing point
C) at melting point D) above melting point
 
Answer & Explanation Answer: B) below freezing point

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Q:

In a _________ the wave particles of the medium vibrate in a direction perpendicular to the direction of wave propagation

A) longitudinal B) rolling
C) transverse D) field
 
Answer & Explanation Answer: C) transverse

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Q:

When an unbalanced force acts on an object

A) causes change in motion of the object B) the speed & direction of the object will change
C) causes the object to move D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Unbalanced forces are the forces which causes change in motion of the object. It sets the object in motion and may cause the object to move. If the object is already in motion, it changes the speed and direction of the object.

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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

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Q:

1 kW = ?

A) 1000 W B) 10 W
C) 100 W D) 10000 W
 
Answer & Explanation Answer: A) 1000 W

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