GRE Subject 2026 Practice Test Physics Nuclear Physics Free Quiz 2

11. What is the activity of a radioactive sample?

A. A = N/T B. A = Nλ C. A = N/T D. A = λN

12. What is the SI unit of activity?

A. Curie B. Becquerel C. Rutherford D. Gray

13. What is the energy released in nuclear reactions?

A. E = mc² B. E = ½mv² C. E = hf D. E = Δmc²

14. What is the charge of a neutron?

A. Positively charged B. Neutral C. Negatively charged D. Massless

15. What is the charge of a proton?

A. Positively charged B. Neutral C. Negatively charged D. Massless

16. What is the charge of an electron?

A. Positive B. Neutral C. Negative D. Massless

17. What is the charge of a positron?

A. Negative B. Positive C. Neutral D. Massless

18. What is the energy released or absorbed in a nuclear reaction?

A. Q-value B. Binding energy C. Decay constant D. Half-life

19. What process does a nuclear bomb use?

A. Fission only B. Fusion only C. Both D. Fission or fusion

20. What slows down neutrons in a nuclear reactor?

A. Control rods B. Moderator C. Coolant D. Fuel