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Rays from the headlight of a motor car are rendered parallel by suitably using

A. a convex mirror behind it

B. a concave lens behind it

C. a concave mirror in front of it

D. a concave mirror behind it

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  1. Acoustics' la a branch or study dealing with
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  3. Hot water is poured simultaneously in four metallic tumblers painted outside with different paints.…
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  14. Water kept in an earthen pot is less cool on rainy days than in summer because during the rainy days
  15. The orbit of Venus lies between those of
  16. When a ship floats on water, the weight or water displaced is
  17. Of the following which has got the highest frequency?
  18. The atmosphere gets heated up mainly by
  19. A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because
  20. The image formed by a plane mirror is
  21. A proton is
  22. The rate of cooling of a hot body depends on
  23. The planet that has got a well-developed set of rings is
  24. One finds it more difficult to walk on ice than on a concrete road because
  25. When are temperature resistance
  26. Sound waves in air are
  27. When light passes from air to glass, its velocity in glass
  28. The end product in the uranium disintegration series is
  29. The freezer in a refrigerator is placed near the top
  30. Some persons are not able to see distant objects clearly because the image of the object is focused…