Physics
A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will

Decrease
Have its shape changed
Remain unaffected
Increase

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

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