Cosmic rays contain

A. protons and electrons

B. alpha particles

C. gamma rays

D. All the above

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  1. When white light passes through a glass prism we get a spectrum on the other side of the prism. In the…
  2. In experiments on static electricity the standard method for obtaining small amounts of positive electricity…
  3. In a hydraulic pressure
  4. Which of the following is not electromagnetic waves?
  5. A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching…
  6. Frictional force acts in
  7. Mercury is used in thermometers because
  8. The escape velocity of a satellite projected from the surface of the earth is independent of
  9. Powder clings to the skin because of
  10. Sound waves
  11. Resistance is measured in
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  14. Enriched uranium means
  15. The motion .of the pendulum of a wall clock is an example of
  16. The Space Application Centre for training in Satellite Communication Technology is located at
  17. Which of the following is wrongly matched?
  18. The heating element often used in an electric iron is
  19. Sun spots are
  20. The radius of an atom is approximately
  21. Pyrometers are instruments used
  22. Who first established the fact that the earth revolves round the sun?
  23. The radius of curvature of a spherical mirror is
  24. The best estimates of the age of the earth comes from the studies of
  25. The stem of a vibrating tuning fork is pressed against a sound box. Then
  26. The unit of power in SI is
  27. For an electron orbiting in a hydrogen atom, the necessary centripetal force keeping it in orbit is…
  28. The electroplating of a metallic article
  29. A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because
  30. It is difficult to bon potatoes at the top or a mountain because