Physics
In which one of the following the phenomenon of total internal reflection of light is used ?

Twinkling of stars
Formation of mirage
Working of binoculars
Formation of rainbow

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Physics
In a conductor

The forbidden energy gap is very narrow
There is no conduction band
The valence band and the conduction band overlap each other
The forbidden energy gap is very wide

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Physics
In the gamma decay of a nucleus

Both the mass number and the atomic number of the nucleus change
Neither the mass number nor the atomic number of the nucleus changes
The mass number of the nucleus changes whereas its atomic number does not change
The mass number of the nucleus does not change whereas its atomic number changes

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