Physics
When a bottle of perfume is opened in one corner of a room the smell spreads soon throughout the room. This is an example of

Viscosity
Diffusion
Surface tension
Capillarity

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Physics
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

It will fall down at the same place where the string breaks
The ball will travel towards the center of the circle and fall down
None of these
It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down

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Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

The initial momentum of the rubber ball is greater than that of the metal ball
Both suffer the same change in momentum
The rubber ball suffers greater change in momentum
The metal ball suffers greater change in momentum

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