Home / General Knowledge / Physics :: section-17

General Knowledge :: Physics

  1. The modulus of elasticity for mild steel is approximately equal to

  2. A.

     210 kN/mm2

    B.

     100 kN/mm2

    C.

     80 kN/mm2

    D.

     10 kN/mm2


  3. The Hooke's law is valid for

  4. A.

     Only proportional region of the stress strain curve

    B.

     Entire stress strain curve

    C.

     Entire elastic region of the stress strain curve

    D.

     Elastic as well as plastic region of the stress strain curve


  5. Gas thermometers are more sensitive than the liquid thermometers because the gases

  6. A.

     Have large coefficient of expansion

    B.

     Are lighter

    C.

     Have low specific heat

    D.

     Have high,specific heat


  7. What happens to a liquid, when the vapour pressure equals the atmospheric pressure?

  8. A.

     The liquid cools

    B.

     The liquid boils

    C.

     No change

    D.

     The liquid evaporates


  9. If the temperature of a place increases suddenly, the relative humidity

  10. A.

     Increases

    B.

     Decreases

    C.

     Remains constant

    D.

     Fluctuates


  11. The modulus of rigidity is the ratio of

  12. A.

     Longitudinal stress to longitudinal strain

    B.

     Volume stress to volume strain

    C.

     Shearing stress to shearing strain

    D.

     Tensile stress to tensile strain


  13. The flux commonly used in brazing is

  14. A.

     Ammonium chloride

    B.

     Borax

    C.

     Zinc chloride

    D.

     Resin plus alcohol


  15. How many laws of physics are there?

  16. A.

     5

    B.

     4

    C.

     3

    D.

     2


  17. Which physicists is the writer of the book 'A Brief History of Time'?

  18. A.

     Isaac Newton

    B.

     Hans Bethe

    C.

     Albert Einstein

    D.

     Stephen Hawking


  19. On which day 'National Science Day' is celebrated in India ?

  20. A.

     February 23

    B.

     February 25

    C.

     February 26

    D.

     February 28