10th Physics Chapter 9: Radioactivity
| Sr # | Questions | A | B | C | D |
|---|---|---|---|---|---|
| 1 | What is a fission chain reaction? | A reaction in which neutrons are absorbed by atomic nuclei | A reaction in which the products of one reaction trigger further reactions | A reaction in which alpha particles are emitted | A reaction in which protons are converted into neutrons | 2 | What is the half-life of a radioactive substance? | The time taken for the substance to lose half of its mass | The time taken for the substance to become stable | The time taken for the substance to emit half of its radiation | The time taken for the substance to decay completely | 3 | What is a nuclear transmutation? | The process of converting a stable nucleus into an unstable nucleus | The process of converting one element into another through nuclear reactions | The process of converting mass into energy | The process of radioactive decay | 4 | What is the central part of an atom that contains protons and neutrons? | Electrons | Nucleus | Isotopes | Neutrons | 5 | How does the half-life of a radioactive substance affect its rate of decay? | The shorter the half-life, the faster the decay rate | The longer the half-life, the faster the decay rate | The shorter the half-life, the slower the decay rate | The half-life does not affect the decay rate | 6 | Which subatomic particle has a positive charge and is found in the nucleus of an atom? | Proton | Neutron | Electron | Photon | 7 | Which of the following is a potential benefit of using radioisotopes? | Increased risk of radiation exposure | Enhanced medical diagnostics and treatments | Environmental pollution | Decreased risk of cancer | 8 | What safety measures can be taken to minimize radiation exposure? | Using shielding materials | Limiting exposure time | Increasing distance from radiation sources | All of the above | 9 | What is nuclear fusion? | The process of splitting atomic nuclei into smaller nuclei | The process of combining atomic nuclei to form a heavier nucleus | The process of converting mass into energy | The process of radioactive decay | 10 | What are radioisotopes? | Isotopes with stable nuclei | Isotopes with unstable nuclei that undergo radioactive decay | Isotopes with high atomic numbers | Isotopes with low atomic numbers | 11 | Which type of radiation has the highest penetrating power? | Alpha particles | Beta particles | Gamma rays | Neutrons | 12 | What term describes the spontaneous emission of radiation from the nucleus of an unstable atom? | Nuclear fusion | Nuclear fission | Radioactivity | Electromagnetism |