Physics
Which of the following parts of the sunlight makes the solar cooker hot ?

Ultra violet
Red light
Infra red
Cosmic rays

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Physics
The law of conservation of energy states that

Energy can neither be created or destroyed
Energy can either be created or destroyed
Energy can neither be created nor destroyed
Energy can either be created nor destroyed

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Physics
Railway tracks are banked on curves so that

No frictional force may be produced between the tracks and the wheels of the train
The train may not fall down inwards
Necessary centripetal force may be obtained from the horizontal component of the weight of the train
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train

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Physics
Scalar Quantities are

Physical quantities which have magnitude only and no direction
Physical quantities which have no magnitude only and only direction
Physical quantities which have no magnitude and no direction
Physical quantities which have magnitude only and direction

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