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 Physics Questions

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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:

Rate of change of displacement is known as ............

A) Acceleration B) Velocity
C) Speed D) Distance
 
Answer & Explanation Answer: B) Velocity

Explanation:
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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

Explanation:
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Q:

AV= constant, where A= area of cross-section and V= velocity of fluid. This equation is called _____.

A) Equation of discontinuity B) Equation of continuity
C) Equation of sustenance D) Equation of parallelism
 
Answer & Explanation Answer: B) Equation of continuity

Explanation:
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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

Explanation:
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Q:

An image formed by a plane mirror, that cannot be obtained on a screen is called _______.

A) Virtual image B) Real image
C) Inverted image D) Erect image
 
Answer & Explanation Answer: A) Virtual image

Explanation:
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Q:

Which of the following never occurs singly in nature?

A) Inertia B) Momentum
C) Force D) Velocity
 
Answer & Explanation Answer: C) Force

Explanation:
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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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