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Chronometer la an instrument to measure

A. heat

B. electric potential

C. time

D. distance between two points

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  2. One finds it more difficult to walk on ice than on a concrete road because
  3. The completely dark portion of a shadow of an object is known as
  4. Which mirror is used as a rear view mirror in Vehicles?
  5. The radius of an atom is approximately
  6. A man stands on the pan of a balance holding a fish in his right hand and bucket of water in his left…
  7. A spherical mirror is
  8. What la the minimum velocity required for a rocket to overcome earth's gravity and travel into space?
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  18. The fact that two large ships travelling on close parallel courses in the same direction tend to move…
  19. Astigmatism, a structural defect of the eye, is due to
  20. Echoes are produced by
  21. Halley's comet appears in the heavens once in
  22. The maximum range of most TV signals is from 121 to 240 km only because
  23. Some persons are not able to see distant objects clearly because the image of the object is focused…
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  26. In a dynamo
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  28. A heavenly body similar in nature to the sun intensely hot glowing mass that produces its energy by…
  29. Drinks kept in a vacuum flask remain hot or cold as the case may be for a long time because
  30. The speed of sound in air at 0° C is approximately