Physics Questions

Q:

Which of the following can do more work?

A) A rotating wheel B) A moving bullet
C) A speeding stone D) A raised hammer
 
Answer & Explanation Answer: B) A moving bullet

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Q:

If a current of 1.5 A is maintained in a resistor of 10 ohm, then the energy dissipated in the resistor in 1 minute will be 

 

 

A) 15 W  B) 22.5 W 
C) 135 W  D) 1350 W
 
Answer & Explanation Answer: D) 1350 W

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Q:

In which of the following mentioned activities is the potential energy (P.E) converted into kinetic energy(K.E)?

A) The explosion of a fire cracker B) The switching on of a torch
C) The switching off of a torch D) The swinging of a pendulum
 
Answer & Explanation Answer: D) The swinging of a pendulum

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Q:

If the initial velocity of a car is 5 m/s, and the final velocity is 10 m/s in 5s, then the acceleration is ___.

A) 10 m/s2 B) 0.1 m/s2
C) 1 m/s2 D) 5 m/s2
 
Answer & Explanation Answer: C) 1 m/s2

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Q:

A source maintains a current I in a resistor of resistor of resistance R. If V is the potential difference across the resistor. The electrical energy dissipated in the resistor in time is given _____

 

A) VI2t B) V2It
C) IR2t D) VIt
 
Answer & Explanation Answer: D) VIt

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Q:

Sensitivity of potentiometer can be increased by

A) increasing the e.m.f. of the cell B) increasing the length of the potentiometer
C) decreasing the length of the potentiometer wire D) none of these
 
Answer & Explanation Answer: B) increasing the length of the potentiometer

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Q:

1 pascal equals 1 ________________.

A) N m2 B) N m-2
C) N m D) N m-1
 
Answer & Explanation Answer: B) N m-2

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Q:

Mechanical energy is the sum of

A) kinetic energy + heat energy B) kinetic energy + potential energy
C) potential energy + heat energy D) chemical energy + electrical energy
 
Answer & Explanation Answer: B) kinetic energy + potential energy

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