Physics Questions and Answers

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Q51
Out of the following pairs, which one does not have identical dimension?
  • A Moment of inertia and moment of a force
  • B Work and Torque
  • C Angular momentum and Planck's constant
  • D Impulse and Momentum
Answer: Option A
Q52
 Mercury is commonly used as a thermometric fluid rather than water because
  • A specific heat of mercury is less than water
  • B specific heat of mercury is more than water
  • C mercury has greater visibility than water
  • D density of mercury is more than the water
Answer: Option C
Q53
Optical fibre works on the
  • A principle of refraction
  • B total internal reflection
  • C scattering
  • D interference
Answer: Option B
Q54
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
  • A 4.2 seconds
  • B 42 seconds
  • C 4.2 years
  • D 42 years
Answer: Option C
Q55
Supersonic plane fly with the speed
  • A less than the speed of sound
  • B of sound
  • C greater than the speed of sound
  • D of light
Answer: Option C
Q56
Mach number is used in connection with the speed of
  • A sound
  • B aircraft
  • C spacecraft
  • D ships
Answer: Option B
Q57
 On a stationary sail boat, air is blown from a fan attached to the boat. The boat
  • A moves in opposite direction in which the air is blown
  • B does not move
  • C moves in the same direction in which air blows
  • D spins around
Answer: Option B
Q58
Rainbow is due to
  • A absorption of sunlight in minute water droplets
  • B diffusion of sunlight through water droplets
  • C ionisation of water deposits
  • D refraction and reflection of sunlight by water droplets
Answer: Option D
Q59
Stars which appear single to the naked eye but are double when seen through a telescope are
  • A novas and supernovas
  • B binaries
  • C asteroids
  • D quasars
Answer: Option B
Q60
Solar eclipse will take place when
  • A the sun is between the moon and the earth
  • B the earth is between the moon and the sun
  • C the moon is between the sun and the earth
  • D the moon does not lie on the line joining the sun and the earth
Answer: Option C

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