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 Physics Questions

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Q:

A body of mass 18 kg is moving with a velocity of 6 m/s, find its momentum.

A) 108 B) 4.5
C) 54 D) 9
 
Answer & Explanation Answer: A) 108

Explanation:
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Q:

A permanent magnet can affect

A) Magnets B) Electromagnets
C) Both A & B D) None of the above
 
Answer & Explanation Answer: C) Both A & B

Explanation:

A permanent magnet can affect both magnets and electromagnets.

a_permanent_magnet_can_affect1559196137.jpg image

A permanent magnet has natural magnetic properties while a temporal magnet is created by artificial means. Permanent magnets do not lose their magnetic ability.

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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:

Which motion has magnitude of static frictional force directly proportional to normal reaction?

A) Impending motion B) Actual motion
C) Both 1 and 2 D) None of the above
 
Answer & Explanation Answer: A) Impending motion

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Q:

What is the effective resistance (in Ω) of two resistors 20 Ω and 30 Ω connected in parallel?

A) 50 B) 12
C) 24 D) 36
 
Answer & Explanation Answer: B) 12

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Q:

Women have shrill voice because of _______.

A) Low frequency B) High frequency
C) Shrill vocals D) Strong epiglottis
 
Answer & Explanation Answer: B) High frequency

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Q:

If the force applied on the object is in the direction opposite to the direction of motion, the speed of the object __________.

A) increases B) stops
C) decreases D) no effect
 
Answer & Explanation Answer: C) decreases

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Q:

A man standing close to the platform at a railway station experiences a pulling force towards a fast moving train because of __________ .

A) gravitational force between train and man B) illusion of the man
C) the centripetal force D) pressure difference due to fast moving air in between
 
Answer & Explanation Answer: D) pressure difference due to fast moving air in between

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