Physics
A person can jump higher on the moon's surface than on the earth because :

The acceleration due to gravity in moon is smaller than that on the earth.
The moon has no atmosphere
The moon's surface is rough
The moon is cooler than earth

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

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

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