Physics
In the gamma decay of a nucleus

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

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

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

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