Physics
The velocity of sound in air

Decreases with decrease of temperature
Decreases with increase of temperature
Increases with decrease of temperature
Does not depend on temperature

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

The ball will travel towards the center of the circle and fall down
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
None of these
It will fall down at the same place where the string breaks

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

The density of salt solution exceeds the density of eggs
Egg absorbs salt from the solution and expands
Albumin dissolves in salt solution and egg becomes lighter
Water has high surface tension

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