Atoms & Nuclei — Advanced + PYQ-Style MCQs

Practice 100 questions on Atoms & Nuclei — Advanced + PYQ-Style MCQs. Includes: For an electron in the first Bohr orbit of hydrogen,…; The half-life of ¹⁴C is 5730 years. If a sample…; The ground state energy of hydrogen atom is −13.6 eV.…. Free quiz on NoteTube.

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1.
For an electron in the first Bohr orbit of hydrogen, the kinetic energy is 13.6 eV. Its total mechanical energy is:
2.
**Assertion (A):** Radioactive decay is a statistical process; individual nuclei decay at random. **Reason (R):** The rate of decay dN/dt = −λN shows that decay rate is proportional to N, not to time.
3.
**Assertion (A):** Both nuclear fission and nuclear fusion release energy. **Reason (R):** In both processes, the products have higher binding energy per nucleon than the reactants.
4.
**Assertion (A):** Gamma decay does not change the atomic number or mass number of a nucleus. **Reason (R):** Gamma rays are electromagnetic radiation (photons) that carry energy but no charge or baryon number.
5.
The binding energy of a nucleus is 200 MeV and it has 50 nucleons. The binding energy per nucleon and approximate mass defect (in u) are:

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