PU CSS 2026 Nuclear Physics Free Quiz 1

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PU CSS 2026 Nuclear Physics Free Quiz 1

PU CSS Quiz

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Navigator 10 Q

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General 10 MCQs

1. What is radioactivity?

A. Spontaneous emission of radiation from unstable nuclei B. Chemical reaction C. Nuclear fission D. Nuclear fusion

2. Who discovered radioactivity?

A. Marie Curie B. Henri Becquerel C. Rutherford D. Einstein

3. What are the three types of radiation?

A. Alpha only B. Beta only C. Alpha, beta, and gamma D. X-rays only

4. What happens in alpha decay?

A. Emits an alpha particle (₂He⁴) B. Emits an electron C. Emits a gamma ray D. Emits a positron

5. How do mass number and atomic number change in alpha decay?

A. Mass number decreases by 2, atomic number decreases by 4 B. Mass number decreases by 4, atomic number decreases by 2 C. Mass number decreases by 4, atomic number decreases by 4 D. Mass number decreases by 2, atomic number decreases by 2

6. What are the properties of alpha particles?

A. High penetrating power B. Low ionizing power C. Low penetrating power, high ionizing power D. No penetrating power

7. What is the charge of an alpha particle?

A. +1e B. -1e C. 0 D. +2e

8. What happens in beta decay?

A. Neutron → proton + electron + antineutrino B. Proton → neutron + positron + neutrino C. Gamma emission D. Alpha emission

9. How do mass number and atomic number change in beta decay?

A. Mass number decreases B. Mass number same, atomic number increases by 1 C. Atomic number decreases D. Both mass number and atomic number change

10. What is gamma decay?

A. Emission of gamma rays from an excited nucleus B. Emission of alpha particles C. Emission of beta particles D. Emission of positrons

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