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5/39 MCQs for:

Radioactivity

Which of the following quantities are conserved in all nuclear reactions?

1) Electric charge

2) Number of nuclei

3) Number of protons

If 3 only is correct.

If 1 only is correct.

If 1 and 2 are correct.

If 1 and 3 are correct.

What is a key safety rule in radiology?

Only wear normal clothes.

Stay close to the source.

Ignore safety warnings.

Minimize time, maximize distance, use shielding.

Half-life of a radioactive substance refers to:

Time for half the radioactive nuclei to decay.

Time to emit all radiation.

Time for emission of one particle.

Time for full decay.

Nuclear fission produces:

Only heat.

Only light.

Only sound.

Energy and radioactive isotopes.

Radioactivity is the process by which:

Atoms absorb energy.

Molecules combine chemically.

Electrons move to higher orbitals.

Nuclei emit particles or energy spontaneously.