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Atomic and nuclear physics
5 Class 10 Physics questions with answers and explanations.
Printable worksheet with answer key
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Which radiation is the most penetrating?
- 1 All equal
- 2 Gamma
- 3 Alpha
- 4 Beta
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Correct answer: Gamma
Gamma rays pass through most materials and need thick lead or concrete to stop them.
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An alpha particle is the same as a:
- 1 Hydrogen nucleus
- 2 Helium nucleus
- 3 Neutron
- 4 Electron
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Correct answer: Helium nucleus
An alpha particle is two protons and two neutrons, a helium nucleus.
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A sample has a half life of 4 days. What fraction remains after 12 days?
- 1 1/16
- 2 1/8
- 3 1/4
- 4 1/2
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The splitting of a heavy nucleus into lighter nuclei is called:
- 1 Fission
- 2 Fusion
- 3 Ionisation
- 4 Evaporation
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Correct answer: Fission
This is nuclear fission, as in a nuclear power plant.
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The energy of the Sun comes from nuclear:
- 1 Fusion
- 2 Fission
- 3 Combustion
- 4 Decay only