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Q. In the remote control of television, electromagnetic waves used are
All electromagnetic waves used are infrared.
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Q. Which of the following is the correct device for the detection of thermal radiation?
Q. Stars appears to move from east to west because
Q. When a light wave is reflected from a mirror, there is a change in its
Q. Out of the following, which is not emitted by radioactive substance?
Q. The unit of measurement of noise is
Q. Filaments of electric bulbs are usually made of ?
Q. The angle in which a cricket ball should be hit to travel maximum horizontal distance is :
Q. In an inelastic collision, state which among the given statements is true
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