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Atomic and nuclear physics
9 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
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A device used to detect radiation is the:
- 1 Thermometer
- 2 Voltmeter
- 3 Barometer
- 4 Geiger Muller counter
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Correct answer: Geiger Muller counter
It clicks when radiation passes through.
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Which radiation is stopped by a sheet of paper?
- 1 Beta
- 2 X rays
- 3 Alpha
- 4 Gamma
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Carbon-14 is used for:
- 1 Cooling
- 2 Making steel
- 3 Lighting
- 4 Dating ancient objects
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Correct answer: Dating ancient objects
Its half life lets us date organic remains.
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Radioactive decay is a:
- 1 Process that needs light
- 2 Random process
- 3 Process we can start at will
- 4 Chemical reaction
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Correct answer: Random process
We cannot predict when a single nucleus will decay.