Physics
A bimetal made copper and iron strips welded together is straight at room temperature. It is held vertically with iron strip towards left and copper strip towards right. If this bimetal is heated, it will

Bend towards right
Bend towards left
None of these
Remain straight

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Physics
Which of the following is not a property of heavy water ?

Freezing point of heavy water is higher than that of ordinary water
Boiling point of heavy water is lower than that or ordinary water
It produces corrosion
Density of heavy water is higher than that of ordinary water

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Physics
Railway tracks are banked on curves

necessary centripetal force may be obtained from the horizontal component of the weight of the train
to avoid frictional force between the tracks and wheels
the train may not fly off in the opposite direction
necessary centrifugal force may be obtained from the horizontal component weight of the train

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Physics
A standing wave occurs when

A wave reflects upon itself
The speed of the wave is zero or near zero
The amplitude of a wave exceeds its wavelength
Two waves overlap

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