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 Physics Questions

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Q:

An ideal gas cannot be

A) liquified B) solidified
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) liquified

Explanation:

An ideal gas cannot be liquified because forces between the molecules are negligible.

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Q:

If a person moves a trolley for a distance of 10 m with a force of 50 N, then the work done is

A) 0.2 J B) 5 J
C) 20 J D) 500 J
 
Answer & Explanation Answer: D) 500 J

Explanation:
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Q:

The least penetrating power ray is

A) Gamma rays B) Beta rays
C) Alpha rays D) None of the above
 
Answer & Explanation Answer: C) Alpha rays

Explanation:

The least penetrating power ray is Alpha rays.

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Q:

A  photon  of  X-ray  has  energy  of  1  keV.  A photon of visible radiation has energy of 3 eV.  In  this  context,  which  one  of  the following statements is not correct?

A) The wavelength of X-ray photon is less than the wavelength of visible radiation photon. B) Both    the    photons    have    different energies.
C) The  speeds  of  both  the  photons  in vacuum are different D) The   frequency   of   X-ray   photon   is higher  than  the  frequency  of  visible radiation photon.
 
Answer & Explanation Answer: C) The  speeds  of  both  the  photons  in vacuum are different

Explanation:

The speed of all the electromagnetic radiation are always   same   and   equal   to   the numerical value 3 x 10^8m/sec.

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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:

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:

A body of mass 5 kg accelerates from 12 m/s to 20 m/s in 4 seconds due to the application of a force on it. Calculate the magnitude of this force (in N).

A) 40 B) 10
C) 20 D) 80
 
Answer & Explanation Answer: B) 10

Explanation:
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Q:

Upward force on a floating body is called _______.

A) jerk B) buoyancy
C) Archimedal force D) Anti-gravity
 
Answer & Explanation Answer: B) buoyancy

Explanation:
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