Physics
Heavy water is used in nuclear reactor to

Increase speed of neutron
Absorb neutron
Increase temperature
Slow down neutron

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

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

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Physics
A balloon filled with hydrogen will

Continue going upwards uninterrupted
Reach a particular height and start coming down
Reach a particular height and remain floating
Burst after reaching some height

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