The acceleration due to gravity of a catastrophic earthquake will be
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The half-life of a radio active element is 5 years. The fraction of the radioactive substance that remains after 20 years is
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Which one of the following combinations of aperture and shutter speed of a camera will allow the maximum exposure ?
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If a gas is compressed to half of its original volume at 27°C, to what temperature should it be heated to make it occupy its original volume ?
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In an electronic watch, the component corresponding to pendulum of a pendulum clock is a
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