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

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

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Physics
What is the direction of torque?

Opposite to the direction of applied force
Same as the direction of applied force
Parallel to the radius
Perpendicular to the direction of applied force

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Physics
Solar eclipse will take place when

the moon does not lie on the line joining the sun and the earth
the earth is between the moon and the sun
the moon is between the sun and the earth
the sun is between the moon and the earth

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