Q. Magnetism at the centre of a bar magnet is

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Q. It is more difficult to walk on a sandy road than on a concrete road because

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Q. 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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Q. Of the following properties of a wave, the one that is independent of the other is its

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Q. Lux is the SI unit of

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Q. On a rainy day, small oil films on water show brilliant colours. This is due to

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Q. 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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Q. Materials for rain-proof coats and tents owe their water-proof properties to

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Q. RADAR is used for

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Q. Sound of frequency below 20 Hz is called

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Q. 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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Q. Suitable impurities are added to a semiconductor depending on its use. This is done in order to

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Q. Stars twinkle because

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Q. It takes much longer to cook food in the hills than in the plains, because

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Q. Moment of inertia is

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Q. Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?

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Q. Inside an aeroplane, flying at a high altitude,

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Q. Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

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Q. One thousand microns is equal to

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Q. Sound travels at the fastest speed in

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