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Cosmic rays are

A. powerful X-rays falling on the earth from space

B. ultraviolet rays from the sun

C. gamma rays from radioactive minerals

D. very energetic radiation falling upon the earth from outer space consisting chiefly of charged particles

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  1. The temperature of a large bucket-full of hot water (a few degrees below boiling point) is lower than…
  2. Increase in pressure
  3. Cosmic rays contain
  4. A solar eclipse occurs when the earth, the sun and the moon are in a straight line, and
  5. A temperature below absolute zero for an ideal gas
  6. When the earth reaches its perihelion
  7. Sun spots are
  8. Mercury is used in thermometers because
  9. A nuclear reactor is said to have become 'critical' when
  10. The shadow below a tree has bright spots in it because
  11. Increase in pressure
  12. When a body is projected upwards
  13. An electric kettle used for boiling hard water has a white scale deposited on its heating element. This…
  14. The cell that can be recharged, after it has run down, by passing a direct current through it from a…
  15. A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity…
  16. If a band is played on the moon the sound will
  17. Lightning conductors are made of
  18. To get 5 images of a single object one should have two plane mirrors inclined at an angle of
  19. Enriched uranium means
  20. We see the sun before it actually rises on the horizon. This is due to
  21. Radio waves sent out by radio stations are reflected by
  22. Gamma radiations are used for
  23. When a body Is taken to the poles from the equator, Its weight becomes
  24. Red Light is used as a dancer signal because
  25. The speed of sound in a medium depends upon the properties of the medium such as
  26. A bolometer is used to measure
  27. Antiparticle of electron is
  28. On applying a constant force to a mass, It moves with a uniform
  29. The period of a geostationary (synchronous) satellite orbiting the earth over the equator la
  30. Sound waves