Physics
Ball bearings are used in cycles, scooters etc to

Reduce the friction between ground and the whee
None of these
Reduce the friction between the wheel and the axle
Increase the friction between the wheel and the axle

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Physics
Solar eclipse will take place when

the sun is between the moon and the earth
the moon is between the sun and the earth
the moon does not lie on the line joining the sun and the earth
the earth is between the moon and the sun

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Physics
Siphon will fail to work if:

Both its limbs are of unequal length.
The densities of the liquid in the two vessels are equal.
The temperature of the liquids in the two vessels are the same.
The level of the liquid in the two vessels are at the same height.

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

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

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