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  • Question

  • Lux is the SI unit of


  • Options
  • A. intensity of illumination
  • B. luminous efficiency
  • C. luminous flux
  • D. luminous intensity

  • Correct Answer
  • intensity of illumination 

    Explanation
    The SI unit of intensity of illumination (illuminance) is the lux. An illuminance of 1.0 lux is produced by 1.0 lumen of light shining on an area of 1.0 m^2.

    • Physics problems

    Search Results

    • 1. Optical fibre works on the

    • Options
    • A. principle of refraction
    • B. total internal reflection
    • C. scattering
    • D. interference
      • Discuss
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. Large astronomical telescopes always use as objective

    • Options
    • A. lens
    • B. mirror
    • C. combinations of lenses
    • D. None of the above
      • Discuss
    • 6. Pick out the scalar quantity

    • Options
    • A. force
    • B. pressure
    • C. velocity
    • D. acceleration
      • Discuss
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2

    • Options
    • A. 0.14 m/s
    • B. 140 m/s
    • C. 1.4 km/s
    • D. 14 m/s
      • Discuss

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