Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

Both suffer the same change in momentum
The metal ball suffers greater change in momentum
The rubber ball suffers greater change in momentum
The initial momentum of the rubber ball is greater than that of the metal ball

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Physics
A dynamo is a device which

Creates electrical energy
Converts electrical energy into mechanical energy
Creates mechanical energy
Converts mechanical energy into electrical energy

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Physics
In the gamma decay of a nucleus

Neither the mass number nor the atomic number of the nucleus changes
Both the mass number and the atomic number of the nucleus change
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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Physics
What is a neuron ?

Particle released during radioactivity
Basic unit of energy
The anti-particle of neutron
Basic unit of nervous system

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