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Q. Hygrometer is used to measure
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Q. Why does the surface water of a pond remain cool in a hot day?
Q. A periscope works by the principle of
Q. In a laser (say neon laser) all the atoms emit the light waves of
Q. The direction of heat flow between two objects depends on
Q. When a piece of pure silicon is doped with aluminium, then
Q. Which of the following devices converts electrical energy into mechanical energy?
Q. The primary agent of contact metamorphism is
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