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 Physics Questions

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Q:

What is the unit of the physical quantity "Capacitance"?

A) weber B) farad
C) tesla D) ohm
 
Answer & Explanation Answer: B) farad

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Q:

Work done by a passenger standing on a platform holding a suitcase weighing 10kg is

A) 980 J B) 98 J
C) 0 J D) 100 J
 
Answer & Explanation Answer: C) 0 J

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2 1097
Q:

Which among the following is false about displacement?

A) It can be positive, negative or zero B) Displacement is never greater than Distance
C) Its SI unit is meter D) It is always positive
 
Answer & Explanation Answer: D) It is always positive

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2 1096
Q:

Blood pressure is measured by _______.

A) Barometer B) Sphygmomanometer
C) Hydrometer D) Thermometer
 
Answer & Explanation Answer: B) Sphygmomanometer

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2 1093
Q:

In which of the following situations is mechanical energy most likely to be conserved?

A) A feather falls from the sky. B) A football flies through the air.
C) A hockey player digs his skates into the ice. D) A skateboard rolls into the grass.
 
Answer & Explanation Answer: B) A football flies through the air.

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1 1092
Q:

Calculate the pressure (in Pa) if a thrust of 800 N is applied to an area of 16 m2.

A) 128 B) 100
C) 64 D) 50
 
Answer & Explanation Answer: D) 50

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0 1090
Q:

In an optical fibre the signal is transmitted

A) in a straight line path B) In a curved path
C) due to total internal reflection D) Due to refraction
 
Answer & Explanation Answer: D) Due to refraction

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2 1087
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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