Physics
Which of the following is not true about X-rays?

Can affect photographic plates
Travel with the speed of light
Have low penetrating power
Can be reflected or refracted

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Physics
What is the principle of a ''Life Jacket"?

It provides oxygen to a drowning person
The person can sit on it like a raft
It decreases the volume of the person to keep him afloat
It increases the volume of the person to keep him afloat

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Physics
Skating on ice is possible because

The pressure on the ice due to skate raises its melting point
The surface of ice is smooth
Ice is cold
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water

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