Physics
The centre of gravity of a sprinter during the race lies

To the left side of the body
At the centre of the body
Ahead of his feet
Behind his feet

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Physics
The bats can fly in the dark because

They generate ultrasonic sound waves
They can see the objects in darkness
They have weak legs and are likely to be attacked by predators
They generate flashes of light

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Physics
For an ideal gas, which one of the following statements does not hold true?

The potential energy of the gas molecules is zero
The kinetic energies of all gas molecules are not same
The speed of all gas molecules is same
There is no interactive force between the molecules.

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