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  • Question
  • Light travels at the fastest speed in


  • Options
  • A. glass
  • B. water
  • C. hydrogen
  • D. vacuum

  • Correct Answer
  • vacuum 


  • Physics problems


    Search Results


    • 1. Light year is a unit of

    • Options
    • A. time
    • B. distance
    • C. light
    • D. intensity of light
    • Discuss
    • 2. Intensity of sound has

    • Options
    • A. an object existence
    • B. a subject existence
    • C. no existence
    • D. both subjective and objective existence
    • Discuss
    • 3. Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

    • Options
    • A. Water, iron and air
    • B. Iron, air and water
    • C. Air, water and iron
    • D. Iron, water and air
    • Discuss
    • 4. Isotopes of an element contain

    • Options
    • A. the same number of protons but different number of neutrons
    • B. the same number of neutrons but different number of protons
    • C. equal number of protons and electrons
    • D. equal number of nucleons
    • Discuss
    • 5. Siphon will fail to work if

    • Options
    • A. the densities of the liquid in the two vessels are equal
    • B. the level of the liquid in the two vessels are at the same height
    • C. both its limbs are of unequal length
    • D. the temperature of the liquids in the two vessels are the same
    • Discuss
    • 6. 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
    • 7. 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
    • 8. ML2T-2 is the dimensional formula for

    • Options
    • A. moment of inertia
    • B. pressure
    • C. elasticity
    • D. couple acting on a body
    • Discuss
    • 9. 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
    • 10. Large astronomical telescopes always use as objective

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


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