1. Kindly refer the question below:

The Feynman diagram shows a particle interaction involving a W boson.



Which particles are interacting?

2. Kindly refer the question below:

A nucleus of the isotope plutonium-238 decays into a nucleus of uranium by emitting an alpha particle. What is the nucleon number of the uranium nucleus?

3. The nuclear reaction equation for the decay of a nucleus of thorium-231 (Th-231) to a nucleus of protactinium-231 (Pa-231) is shown below.


The particle x is a/an

4. Which of the following is the correct definition of the binding energy of a nucleus?
5. Kindly refer the question below:

For which quantity can the unit MeVc–2 be used?

6. For which reason were quarks first introduced?
7. Kindly refer the question below:

The reaction p+ + n0 → p+ + 0 does not occur because it violates the conservation law of

8. Which statement about atomic spectra is not true?
9. The half-life of a particular radioactive isotope is 8 days. The initial activity of a pure sample of the isotope is A.

Which of the following is the time taken for the activity of the isotope to change by A?

10. Which of the following provides evidence for the existence of atomic energy levels?
11. Which statement correctly describes the process of nuclear fusion?
12. The nuclear equation below is an example of the transmutation of mercury into gold.


The particle X is a

13. Nuclei of the isotope nitrogen-14 are bombarded with neutrons and as a result nuclei of an isotope of carbon are produced. The nuclear reaction equation for this process may be written as

What is the nucleon number A of the isotope of carbon?

14. In a particular atom, the nucleon number is the total number of
15. Photons of energy 2.3eV are incident on a low-pressure vapour. The energy levels of the atoms in the vapour are shown

What energy transition will occur when a photon is absorbed by the vapour? 

16. When compared with beta particles and gamma-ray photons, alpha particles have the greatest
17. Kindly refer the question below:

In a neutral atom there are ne electrons, np protons and nn neutrons. What is the mass number of the nuclide?

18. A freshly prepared sample contains 4.0 μg of iodine-131. After 24 days, 0.5μg of iodine-131 remain. The best estimate of the half-life of iodine-131 is
19. A nucleus of californium (Cf) contains 98 protons and 154 neutrons. Which of the following correctly identifies this nucleus of californium?
20. Kindly refer the question below:

Which of the following gives the correct number of protons and neutrons in a nucleus of carbon-14

21. A nucleus of phosphorus (P) decays to a nucleus of silicon (Si) with the emission of particle X and particle Y.

What are X and Y?

22. In nuclear fission, a nucleus of element X absorbs a neutron (n) to give a nucleus of element Y and a nucleus of element Z.

  X + n → Y + Z + 2n

23. Kindly refer the question below:

A student suggests the following nuclear reaction between deuterium


where n and m are integers. What are X and Y?

24. What gives the total change in nuclear mass and the change in nuclear binding energy as a result of a nuclear fusion reaction?

25. Two pulses are travelling towards each other.

What is a possible pulse shape when the pulses overlap?

26. An electron is accelerated through a potential difference of 100 V. Which of the following gives the correct gain in kinetic energy of the electron in both joule and electronvolt?

27. Which nucleons in a nucleus are involved in the Coulomb interaction and the strong short-range nuclear interaction?

28. The graph shows the relationship between binding energy per nucleon and nucleon number. In which region are nuclei most stable?


29. In the Geiger–Marsden experiment alpha particles were directed at a thin gold foil. Which of the following shows how the majority of the alpha particles behaved after reaching the foil?