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General Knowledge :: Physics

  1. Which of these is true of all simple machines?

  2. A.

     These make work easier

    B.

     Work input > work output

    C.

     Both A & B

    D.

     None of the above


  3. Which of these is not a simple machine?

  4. A.

     A pair of scissors

    B.

     A lever

    C.

     A ramp

    D.

     The pulley


  5. The plastic material commonly used for making gear wheels is

  6. A.

     Polyesters

    B.

     Nylons

    C.

     Bakelit

    D.

     Polystyrene


  7. The reason for a swimming pool to appear less deep than the actual depth is

  8. A.

     Refraction

    B.

     Light scattering

    C.

     Reflection

    D.

     Interference


  9. When light passes from one medium to another, this phenomenon of change in its direction is called ________

  10. A.

     Refraction

    B.

     Diffraction

    C.

     Propagation

    D.

     No option is correct


  11. Optical fibre works on which of the following principle of light?

  12. A.

     Reflection

    B.

     Refraction

    C.

     Diffraction

    D.

     Total internal reflection


  13. Which colour of light shows maximum deviation when passed through a prism ?

  14. A.

     White

    B.

     Red

    C.

     Violet

    D.

     Green


  15. The sparkling of a diamond is due to

  16. A.

     Total internal reflection of light

    B.

     Interference of light

    C.

     Polarisation of light

    D.

     Refraction of light


  17. Stars appear twinkling because of ......... of light.

  18. A.

     Reflection

    B.

     Scattering

    C.

     Emission

    D.

     Absorption


  19. Stars in the sky appear to twinkle due to

  20. A.

     A series of refractions

    B.

     A series of reflections

    C.

     A surface tension phenomenon

    D.

     Multiple diminishing brightness