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  • Question
  • Optical fibre works on the


  • Options
  • A. principle of refraction
  • B. total internal reflection
  • C. scattering
  • D. interference

  • Correct Answer
  • total internal reflection 


  • Physics problems


    Search Results


    • 1. Mica is used in electrical appliances such as electric iron because mica is

    • Options
    • A. a good conductor of heat but a bad conductor of electricity
    • B. a bad conductor of heat but a good conductor of electricity
    • C. a good conductor of heat as well as electricity
    • D. a bad conductor of heat as well as electricity
    • Discuss
    • 2. Supersonic plane fly with the speed

    • Options
    • A. less than the speed of sound
    • B. of sound
    • C. greater than the speed of sound
    • D. of light
    • Discuss
    • 3. Mercury is commonly used as a thermometric fluid rather than water because

    • Options
    • 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
    • Discuss
    • 4. Large astronomical telescopes always use as objective

    • Options
    • A. lens
    • B. mirror
    • C. combinations of lenses
    • D. None of the above
    • Discuss
    • 5. Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?

    • Options
    • A. Pressure and Young's modules
    • B. Planck's constant and Angular momentum
    • C. Impulse and moment of force
    • D. Force and rate of change of linear momentum
    • Discuss
    • 6. Lux is the SI unit of

    • Options
    • A. intensity of illumination
    • B. luminous efficiency
    • C. luminous flux
    • D. luminous intensity
    • Discuss
    • 7. Pick out the scalar quantity

    • Options
    • A. force
    • B. pressure
    • C. velocity
    • D. acceleration
    • Discuss
    • 8. Railway tracks are banked on curves

    • Options
    • A. necessary centrifugal force may be obtained from the horizontal component weight of the train
    • B. to avoid frictional force between the tracks and wheels
    • C. necessary centripetal force may be obtained from the horizontal component of the weight of the train
    • D. the train may not fly off in the opposite direction
    • Discuss
    • 9. Let a thin capillary tube be replaced with another tube of insufficient length then, we find water

    • Options
    • A. will overflow
    • B. will not rise
    • C. depressed
    • D. change its meniscus
    • Discuss
    • 10. Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?

    • Options
    • A. Rainbow
    • B. Earthshine
    • C. Halo
    • D. Mirage
    • Discuss


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