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PHYSICS MCQs

Total Questions : 3767 | Page 6 of 377 pages
Question 51. Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
  1.    X-rays
  2.    ultraviolet light
  3.    visible light
  4.    radio waves
 Discuss Question
Answer: Option C. -> visible light
Question 52. Mercury is commonly used as a thermometric fluid rather than water because
  1.    specific heat of mercury is less than water
  2.    specific heat of mercury is more than water
  3.    mercury has greater visibility than water
  4.    density of mercury is more than the water
 Discuss Question
Answer: Option C. -> mercury has greater visibility than water
Question 53. Out of the following pairs, which one does not have identical dimension?
  1.    Moment of inertia and moment of a force
  2.    Work and Torque
  3.    Angular momentum and Planck's constant
  4.    Impulse and Momentum
 Discuss Question
Answer: Option A. -> Moment of inertia and moment of a force
Question 54. Optical fibre works on the
  1.    principle of refraction
  2.    total internal reflection
  3.    scattering
  4.    interference
 Discuss Question
Answer: Option B. -> total internal reflection
Question 55. Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
  1.    4.2 seconds
  2.    42 seconds
  3.    4.2 years
  4.    42 years
 Discuss Question
Answer: Option C. -> 4.2 years
Question 56. Supersonic plane fly with the speed
  1.    less than the speed of sound
  2.    of sound
  3.    greater than the speed of sound
  4.    of light
 Discuss Question
Answer: Option C. -> greater than the speed of sound
Question 57. Mach number is used in connection with the speed of
  1.    sound
  2.    aircraft
  3.    spacecraft
  4.    ships
 Discuss Question
Answer: Option B. -> aircraft
Question 58. On a stationary sail boat, air is blown from a fan attached to the boat. The boat
  1.    moves in opposite direction in which the air is blown
  2.    does not move
  3.    moves in the same direction in which air blows
  4.    spins around
 Discuss Question
Answer: Option B. -> does not move
Question 59. Rainbow is due to
  1.    absorption of sunlight in minute water droplets
  2.    diffusion of sunlight through water droplets
  3.    ionisation of water deposits
  4.    refraction and reflection of sunlight by water droplets
 Discuss Question
Answer: Option D. -> refraction and reflection of sunlight by water droplets
Question 60. Stars which appear single to the naked eye but are double when seen through a telescope are
  1.    novas and supernovas
  2.    binaries
  3.    asteroids
  4.    quasars
 Discuss Question
Answer: Option B. -> binaries

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