Sound waves in air are
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Magnetism at the centre of a bar magnet is
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It is more difficult to walk on a sandy road than on a concrete road because
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Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
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Of the following properties of a wave, the one that is independent of the other is its
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Lux is the SI unit of
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On a rainy day, small oil films on water show brilliant colours. This is due to
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Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
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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 'deer's thirst'?
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Inside an aeroplane, flying at a high altitude,
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Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
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One thousand microns is equal to
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