A body can escape the gravitational pull of the earth if it is thrown up with a velocity of?
Correct answer C. 7 miles per sec
Tip: press A, B, C or D to answer, and N for the next question.
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See allThe instrument which i specially design for recording earth quake wave is called seismograph which measure earth quake waves on a?
Correct answer C. Richter scale
Cobalt is a material which is?
Correct answer A. Strongly attracted by a magnet
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In a railway track, two rails are joined end to end with a gap tin between them because?
Correct answer D. Accidents due to expansion in summer can be avoided
Quartz crystal in quartz watches work on the principle called?
Correct answer D. Piezo-electric effect
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