Physics Questions Part - 1

1. Which instrument used for finding out wind-direction?
  wind vane

2. Why is ‘Beaufort Scale’ used?
 To measure wind velocity

3. What denotes the smallest temperature?
     1° on the Kelvin scale
4. A temperature at which both the Fahrenheit and the centigrade scales have the same value?
   -40°

5. Angular separation between two colours of the spectrum depends upon which
    thing?
    Angle of deviation

6. Total internal reflection of light is possible when light enters from which thing?
    Water to air

7. What is a suitable unit for expressing electric field strength?
     N/C i.e. Newton/Coulomb

8. The unidirectional property of a pn-junction is useful for its use as which thing?
    Rectifier 

9. Thermal decomposition of alkanes is known as which name?
    Cracking

10. Which energy of the electron at absolute zero is called?
      Fermi energy

11. What is the wavelength of visible spectrum?
      3900-7600 A
12. We cannot see during a fog. why?
       Because of scattering of light 

13. What is meant by ‘Underwriting’, the term frequently used in financial sector?
     Under valuation of the assets.

14. What will be If a pendulum clock be taken from the earth to a revolving artificial satellite?
      It will stop altogether

15. Which physical quantities have the same dimensions?
      Momentum and impulse

16. What is the situation with increasing unemployment and inflation termed?
      Stagflation

17. Who firstly demonstrated experimentally the existence of electromagnetic wave?
      Hertz

18. Heating pyrites in air to remove sulphur is known as which name?
     Roasting

19. By which impact is Nuclear fission is caused?
      Neutron

20. Comets revolve around which body?
      Sun

21. Which layer of the earth is believed to have the heaviest mineral materials of highest density?
      Central core

22. When milk is churned, how does the cream separate from it?
      Due to the centrifugal force

23. Sound travels faster in which thing?
      Iron than in air

24. Which reflects back more sunlight as compared to other three?
      Land covered with fresh snow

25. What minimum number of non-zero non-collinear vectors is required to produce a zero vector?
      3

26. Which mirror is to be used to obtain a parallel beam of light from a small lamp?
       Concave mirror

27. If the temperature of a semiconductor rises, what is its resistivity?
      Decrease

28. ‘mho’ is the unit of which unit?
      Specific resistance

29. In which type of climate does the temperature never rise above 10°C throughout the year?
     Tundra Climate

30. What is the product of the time period of a wave and its frequency?
      Unity

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