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Physics

Physics
Among the following materials sound travels fastest in

Steel
Vacuum
Air
Water

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Physics
Hot springs are heated geothermally by underlying

Mitula
None of these
Magma
Water

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Physics
In an optical fibre the signal is transmitted

In a straight line path
In a curved path
Due to total internal reflection
Due to refraction

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Physics
A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum:

When it is just on the half-way
Just before it touches the ground
When it touches the ground
Just after it is dropped

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Physics
The speed of light in air is

3 × 108 m/s
3 × 10–8 m/s
Infinity
8 × 103 m/s

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Physics
A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will

First rise and then fall
Rise
Remain the same
Fall

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