Materials for rain-proof coats and tents owe their water-proof properties to
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RADAR is used for
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Sound of frequency below 20 Hz is called
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On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
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Suitable impurities are added to a semiconductor depending on its use. This is done in order to
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Stars twinkle because
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It takes much longer to cook food in the hills than in the plains, because
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Moment of inertia is
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Of the following natural phenomena, tell which one known in Sanskrit as deers thirst?
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Inside an aeroplane, flying at a high altitude,
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