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The stars that shine brightly then dimly and then brightly are known as

A. meteors

B. binaries

C. variable stars

D. bright stars

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  3. Of the following which has got the highest frequency?
  4. Out of the following which element has the longest half-life period?
  5. The nuclear model of atom was first visualised by
  6. The radius of an atom is approximately
  7. The hydraulic jack to lift heavy vehicles in automobile service stations is one of the applications…
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  14. The stars that shine brightly then dimly and then brightly are known as
  15. The principle of equivalence of mass and energy was established by
  16. Astigmatism, a structural defect of the eye, is due to
  17. Increase in pressure
  18. Two tumblers stuck together can be separated by
  19. A balloon ruled with hydrogen will
  20. In compact porous soil, the rising of the water is due to
  21. Photocells are used
  22. If the speed of the rotation of the earth increases the weight of a body
  23. Dioptre is the unit of power of
  24. A lactometer la used to
  25. When a body is immersed in a fluid the force of buoyancy of the fluid on the body depends on
  26. The planet that moves fastest around the sun is
  27. A radio set that uses valves does not start operating immediately when it is switched on whereas a set…
  28. A transformer
  29. The principle on which a Jet engine works is
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