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Every action has an equal and opposite reaction is Newton's law of Motion

A. first

B. second

C. third

D. fourth

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  1. A light year means
  2. Which of the following wires of same dimensions offers least resistance to the ,flow of current?
  3. When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs…
  4. In compact porous soil, the rising of the water is due to
  5. The focal length or lens or the eye is under the control or the
  6. The best estimates of the age of the earth comes from the studies of
  7. Primary colours are
  8. The coil of an electric heater is made of
  9. In a refrigerator, the refrigerant is
  10. The planet that is known as earth's twin is
  11. The spectrum of white light can be studied by
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  13. The red colour of the setting sun is due to
  14. Like magnetic poles
  15. An electric kettle used for boiling hard water has a white scale deposited on its heating element. This…
  16. Mercury is used in thermometers because
  17. Sound waves In 'air travel faster if
  18. Solar radiation is preferred to other sources of energy because
  19. In a river, the currents are fastest where the river la
  20. Powder clings to the skin because of
  21. The attraction between similar molecules is called
  22. The force of attraction or repulsion between two charged bodies is directly proportional to the product…
  23. The acoustical quality of a room depends on
  24. When sound waves travel from one medium to another, the quantity which remains unchanged is its
  25. Sound travels fastest in
  26. A workman was working on a rail track. A young boy at a distance holds his ear close to the railway…
  27. At what temperature do the Fahrenheit and Celsius scales give the same reading?
  28. Why is it cool near an open pond on a hot summer day?
  29. The direction of heat flow between two objects depends on
  30. Enriched uranium means