Physics
In the gamma decay of a nucleus

The mass number of the nucleus does not change whereas its atomic number changes
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
Both the mass number and the atomic number of the nucleus change

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Physics
X-rays region lies between

Visible and infra-red region
Gamma-rays and ultraviolet region
Ultraviolet and visible region
Short radio waves and long radio waves

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