Physics
While ascending a hill, the driver of the vehicle keeps the gear ratio

Less than 1
Greater than 1
Equal to 1
Either equal to or greater than 1

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

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

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