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Rays similar to X-rays but of smaller wave length that are given off by radioactive substances are

A. ± -rays

B. ² -rays

C. ³ -rays

D. Cosmic rays

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  1. The heating element often used in an electric iron is
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  3. Echoes are produced by
  4. When a body is partly or wholly immersed in a liquid the apparent loss of weight is equal to the weight…
  5. A nuclear reactor is said to have become 'critical' when
  6. Which metal is used in storage batteries?
  7. The rings of Saturn were discovered by
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  9. The period of oscillation of a simple pendulum depends upon
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  12. A device used to measure heights above sea level is known as
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  14. The mode of travel of heat energy from the sun across the empty space beyond the earth's atmosphere…
  15. The sun continuously produces an enormous amount of energy. This la due to
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  17. The presence of impurities
  18. The stars that shine brightly then dimly and then brightly are known as
  19. Meteors
  20. Diamond shines because of its
  21. When the earth reaches its perihelion
  22. When we tighten the string of a sitar or tanpura its pitch
  23. Moon has no atmosphere because
  24. An astronomical unit of distance is
  25. In an electrical circuit, a fuse is connected
  26. Which of the following sets of elementary particles have nearly equal masses?
  27. A bolometer is used to measure
  28. The property of a fluid by which it resists relative motion within itself is known as
  29. Which of the following is not electromagnetic waves?
  30. Solar radiation is preferred to other sources of energy because