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

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

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Physics
A drop of liquid assumes spherical shape because:

Inter molecular forces are weak in liquids
Intermolecular forces are strong in liquids
A sphere has the least surface area for a given volume
A sphere has the largest surface area for a given volume

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Physics
Dynamo is a device for converting

Heat energy into electrical energy
Mechanical energy into electrical energy
Chemical energy into electrical energy
Magnetic energy into electrical energy

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