Physics
Ball bearings are used in cycles, scooters etc to

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

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Physics
'Mirage' is an example of

Total internal reflection of light only
Refraction of light only
Refraction and total internal reflection of light
Dispersion of light only

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