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The atmosphere gets heated up mainly by

A. direct sun's rays

B. radiation from earth's surface

C. radiogenic heat (resulting from radioactive decay)

D. cosmic rays coming from space

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  1. Velocity of sound in high altitudes is low because at such a height
  2. Pieces of camphor placed on water move about rapidly. This is because of
  3. Rays from the headlight of a motor car are rendered parallel by suitably using
  4. When the disturbed electrons of an exited atom transfer back into lower energy levels they emit energy…
  5. A proton is
  6. A star contains
  7. The Indian Space Research Organisation (ISRO) is located at
  8. When a body Is taken to the poles from the equator, Its weight becomes
  9. The device for tracking and locating the position of a moving object in space is called
  10. The property of a fluid by which it resists relative motion within itself is known as
  11. The image of an object formed on the retina of the eye is
  12. A photon is
  13. Some persons are not able to see distant objects clearly because the image of the object is focused…
  14. A car parked in the sun with its windows closed gets terribly hot inside. This is due to
  15. The barometer was invented by
  16. Who discovered that the Cree Call acceleration Is the same for any object at a given place?
  17. Which of the following can produce electricity?
  18. If a body is taken from the earth to the moon
  19. The evaporation rate depends on
  20. Choose the scalar quantity from the following physical quantities
  21. An electric charge is measured in
  22. When ice just melts
  23. Dioptre is the unit of power of
  24. A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks…
  25. The hygrometer is an apparatus used for finding the
  26. In the case of bodies falling under gravity which of the following remains constant at a given place?
  27. A workman was working on a rail track. A young boy at a distance holds his ear close to the railway…
  28. The sun continuously produces an enormous amount of energy. This la due to
  29. A man Jumping out of a moving train is thrown
  30. The brightest star visible to the naked eye is