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 Physics Questions

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Q:

A circuit breaker is a

A) Switch B) Resistor
C) Fuse D) Resettable protective device
 
Answer & Explanation Answer: D) Resettable protective device

Explanation:

A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload.

 

circuit_breaker_is_a1600689504.jpg image

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Q:

What is the unit of relative density?

A) kg/m B) kg/m2
C) kg/m3 D) It has no unit
 
Answer & Explanation Answer: D) It has no unit

Explanation:
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Q:

Air expands when it _______________.

A) is cooled B) is heated
C) is under pressure D) becomes more humid
 
Answer & Explanation Answer: B) is heated

Explanation:
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Q:

The characteristic of ____ is used in the breaking pads of cars.

A) negative effect of friction B) zero effect of friction
C) weight impulse force tension action D) positive effect of friction
 
Answer & Explanation Answer: D) positive effect of friction

Explanation:
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Q:

If a force acts upon two objects at rest, and having different masses for the same amount of time, then which one of the following will be the same for both the objects?

A) Acceleration B) Kinetic Energy
C) Velocity D) Momentum
 
Answer & Explanation Answer: D) Momentum

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Q:

Find the work done (in J) when a charge of 24 C moves across a potential difference of 6 V.

A) 4 B) 72
C) 8 D) 144
 
Answer & Explanation Answer: D) 144

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Q:

A current I flows through a resistor. A source maintains a potential difference of V across the resistor. The energy supplied by the source in time t is 

A) V I t2 B) V I
C) V I t D) V I/t
 
Answer & Explanation Answer: C) V I t

Explanation:
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Q:

If an object moves in a circular path with uniform ________, its motion is called uniform circular motion.

A) speed B) Time
C) Velocity D) Acceleration
 
Answer & Explanation Answer: A) speed

Explanation:
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