Modern Physics

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Q1. In nuclear fission, what is released? (2022)

Solution:

Nuclear fission releases a significant amount of energy and additional neutrons, which can induce further fission reactions.

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Q2. What is the role of moderators in nuclear reactors? (2023)

Solution:

Moderators are used in nuclear reactors to slow down fast neutrons, making them more likely to induce fission in the fuel.

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Q3. What is the main force that holds the nucleus together? (2020)

Solution:

The strong nuclear force is the primary force that holds the nucleons (protons and neutrons) together in the nucleus.

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Q4. In nuclear fission, what is released as a result of the reaction? (2022)

Solution:

Nuclear fission releases a significant amount of energy and additional neutrons, which can induce further fission reactions.

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Q5. Which of the following is a characteristic of nuclear fusion? (2023)

Solution:

Nuclear fusion releases energy, requires high temperatures, and occurs in stars, making all options correct.

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Q6. What is the main difference between isotopes of an element? (2022)

Solution:

Isotopes of an element differ in the number of neutrons while having the same number of protons.

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Q7. Which of the following processes involves the emission of a positron? (2019)

Solution:

Beta decay involves the emission of a positron, which is the antimatter counterpart of an electron.

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Q8. What is the process of converting a neutron into a proton called? (2020)

Solution:

Beta decay is the process in which a neutron is converted into a proton, emitting an electron and an antineutrino.

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Q9. What is the primary product of nuclear fission? (2019)

Solution:

The primary product of nuclear fission is energy, along with neutrons and smaller nuclei.

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Q10. Which of the following isotopes is commonly used in nuclear reactors? (2021)

Solution:

Uranium-238 is commonly used as fuel in nuclear reactors due to its ability to undergo fission.