Physics
A star appears twinkling in the sky because of

Refraction of light by atmosphere
Diffraction of light by atmosphere
Reflection of light by atmosphere
Scattering of light by atmosphere

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Physics
A Fuse wire is characterised by

Low resistance and high melting point
High resistance and low melting point
High resistance and high melting point
Low resistance and low melting point

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Physics
A balloon filled with hydrogen will

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

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Physics
The term ''equinox' means

The axis of the Earth around which it rotates
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon
When the day and night are of equal duration
The path which the Earthtakes around the Sun

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