Physics
Ball bearings are used in cycles, scooters etc to

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

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Physics
Stationary wave is formed by

Two waves of same frequency travelling in the opposite direction
Two waves of the same speed superposing
A transverse wave superposing a longitudinal wave
Two waves of same frequency travelling in the same direction

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