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General Knowledge :: Physics

  1. The velocity of sound in moist air is more than in dry air because the moist air has

  2. A.

     Less density than dry air.

    B.

     Less pressure than dry air.

    C.

     More pressure than dry air.

    D.

     More density than dry air.


  3. Which one among the following doesn't have any effect on velocity of sound ?

  4. A.

     Pressure

    B.

     Temperature

    C.

     Humidity

    D.

     Density


  5. Velocity of sound in air does not change with the change of

  6. A.

     Temperature of air

    B.

     Pressure of air

    C.

     Moisture content in air

    D.

     Wind in the direction of propagation of sound


  7. The propagation of sound waves in a gas involves

  8. A.

     Adiabatic compression and rarefaction

    B.

     Isothermal compression and rarefaction

    C.

     Isochoric compression and rarefaction

    D.

     Isobaric compression and rarefaction


  9. When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon is known as

  10. A.

     Doppler effect

    B.

     Beats

    C.

     Resonance

    D.

     Echo


  11. Propagation of sound can be visualised as propagation of ________ variations in the medium

  12. A.

     Elasticity

    B.

     Viscosity

    C.

     Density

    D.

     Porosity


  13. Permissible noise level at Residential area during night time is :

  14. A.

     45 dB (A)

    B.

     55 dB (A)

    C.

     75 dB (A)

    D.

     80 dB (A)


  15. Calculate the time period (in seconds) of a sound wave of wavelength 4m traveling with a speed of 500m/s

  16. A.

     2000

    B.

     0.016

    C.

     1000

    D.

     0.008


  17. Which waves cannot be transmitted through vacuum?

  18. A.

     Electromagnetic

    B.

     Light

    C.

     Sound

    D.

     Heat


  19. Submerged objects can be located using

  20. A.

     Radar

    B.

     Sonar

    C.

     Quasar

    D.

     Pulsar