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  • Question
  • Large astronomical telescopes always use as objective


  • Options
  • A. lens
  • B. mirror
  • C. combinations of lenses
  • D. None of the above

  • Correct Answer
  • combinations of lenses 


  • Physics problems


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    • 1. 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
    • 2. ML2T-2 is the dimensional formula for

    • Options
    • A. moment of inertia
    • B. pressure
    • C. elasticity
    • D. couple acting on a body
    • Discuss
    • 3. On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

    • Options
    • A. metals have higher thermal capacity than plastics
    • B. plastics have a lower density than metals
    • C. metals are good conductor of heat
    • D. plastics have a higher thermal conductivity than metals
    • Discuss
    • 4. It takes much longer to cook food in the hills than in the plains, because

    • Options
    • A. in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
    • B. due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil
    • C. in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere
    • D. in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking
    • Discuss
    • 5. Light travels at the fastest speed in

    • Options
    • A. glass
    • B. water
    • C. hydrogen
    • D. vacuum
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. Optical fibre works on the

    • Options
    • A. principle of refraction
    • B. total internal reflection
    • C. scattering
    • D. interference
    • Discuss
    • 10. Lux is the SI unit of

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


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