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 Physics Questions

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Q:

If there were no gravity, which of the following will not be there for a fluid?

A) Viscosity B) Surface Tension
C) Pressure D) Upward Thrust
 
Answer & Explanation Answer: D) Upward Thrust

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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:

The motion of a freely falling body is an example of ________________________ motion.

A) uniformly accelerated B) non-uniformly accelerated
C) constant velocity D) constant speed
 
Answer & Explanation Answer: A) uniformly accelerated

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Q:

Motion of a train is an example of ______.

A) Rotatory motion B) Spin motion
C) Projectile motion D) Translatory motion
 
Answer & Explanation Answer: D) Translatory motion

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Q:

Find the current (in A) when a charge of 500 Coulomb flows in 25 seconds.

A) 12500 B) 20
C) 40 D) 6250
 
Answer & Explanation Answer: A) 12500

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Q:

For an ideal gas, which one of the following statements does not hold true?

A) The speed of all gas molecules is same B) The kinetic energies of all gas molecules are not same
C) The potential energy of the gas molecules is zero D) There is no interactive force between the molecules.
 
Answer & Explanation Answer: A) The speed of all gas molecules is same

Explanation:

In an ideal gas, at any particular time, different particles in the gas have different speeds and hence different kinetic energies. This assumption is reasonable because as the particles collide, we expect their speed to change. Even if initial speed of all the particles was same, the molecular collisions will disrupt this uniformity.Hence statement 1 is incorrect and 2 is correct.

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Q:

The term photon refers to

A) light ray B) sub atomic particle
C) radiation D) None of the above
 
Answer & Explanation Answer: B) sub atomic particle

Explanation:

The photon is a type of elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force. The photon has zero rest mass and always moves at the speed of light within a vacuum.

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Q:

What is the other name of Galileo's law of falling bodies?

A) Law of motion B) Newton's first law
C) Newton's second law D) Newton's third law
 
Answer & Explanation Answer: B) Newton's first law

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