Physics
Out of the following pairs, which one does not have identical dimension?

Angular momentum and Planck's constant
Work and Torque
Impulse and Momentum
Moment of inertia and moment of a force

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Physics
Skating on ice is possible because

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

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Physics
It is dangerous to observe Solar eclipse with naked eyes because

Cosmic rays reach eyes more during the eclipse
Ultraviolet radiations from Sun burn our retina
All radiations from sun initiate chemical reactions in eyes
Infrared radiations from sun burn our retina

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