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Q. The half-life of a radioactive substance depends upon
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Q. Echolocation is an adaptation bats use to
Q. Which of the following devices can be used to detect radiant heat?
Q. The energy derived from the heat of Earth is called
Q. Steam at 1000C causes more severe burns than water at 100° C as
Q. On a rainy day, small oil films on water show brilliant colours. This is due to
Q. The force that generates wind is
Q. When two coherent waves interfere, there is
Q. Rutherford's scattering experiment proved the presence of
Q. Drinks remain hot or cold for a long time in a thermos flask because of the
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