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Class 12 Physics Practice Test: Nucleus - Radioactivity
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Class 12 Physics Practice Test: Nucleus - Radioactivity
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10 Questions

1. A freshly prepared radioactive source of half-time 2h emits radiation of intensity which is 64 times the permissible safe level. Minimum time after which it would be possible to work safely with this source is which of the following?
2. Radioactive material decays by simultaneous emission of two particles with respective half-lives 1620 and 810 years. The time, in years, after which one-fourth of the material remains?
3. A 300-day old radioactive substance shows an activity of 5000 dps, 150 days later its activity becomes 2500 dps. What was its initial activity?
4. Which will be the unknown nucleus formed when 22Ne10 decays into two α-particles and an unknown nucleus?
5. The electron emitted in β – radiation originates from where?
6. What will happen in a time of 7 hours, if a radioactive substance has an average life of 7 hours?
7. Radioactive material decays by simultaneous emission of two particles with respective half-lives 1620 and 810 years. The time, in years, after which one-fourth of the material remains?
8. What will happen in a time of 7 hours, if a radioactive substance has an average life of 7 hours?
9. Emission of β-rays in radioactive decay results in the change of either mass or charge.
10. Emission of β-rays in radioactive decay results in the change of either mass or charge.

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