Physics
What is the change in the angular momentum of a system as per the Law of Conservation of Angular momentum, if the total external torque acting is zero?

None of these
Becomes zero
Increases exponentially
Remains constant

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Physics
Conservation of energy refers to the fact that

Energy cannot be created or destroyed but can be converted from one form to another
If you conserve energy you will not be as tired
The entropy of the universe is always increasing
No chemical reaction is 100 percent efficient

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