Class 12 Physics MCQ Chapter 13 Nuclei

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Class 12 Physics MCQ Chapter 13 Nuclei

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Nuclei

Chapter: 13

MCQs

1. The mass number of a nucleus is –

(i) Number of neutrons.

(ii) Number of protons.

(iii) Sum of protons and neutrons.

(iv) Difference of protons and neutrons.

Ans: (iii) Sum of protons and neutrons.

2. Which particle has no charge?

(i) Electron.

(ii) Proton.

(iii) Neutron.

(iv) Positron.

Ans: (iii) Neutron.

3. The unit of nuclear radius is –

(i) m.

(ii) cm.

(iii) fermi.

(iv) angstrom.

Ans: (iii) fermi.

4. One atomic mass unit (amu) is approximately –

(i) 1.66 × 10⁻²⁴ g

(ii) 1.66 × 10⁻²⁷ kg

(iii) 1.66 × 10⁻¹⁹ kg

(iv) 1.66 × 10⁻²³ g

Ans: (ii) 1.66 × 10⁻²⁷ kg.

5. The binding energy per nucleon is highest for –

(i) U-238

(ii) Fe-56

(iii) H-1

(iv) He-4

Ans: (ii) Fe-56

6. The binding energy of deuteron is about –

(i) 2.2 MeV

(ii) 13.6 eV

(iii) 0.511 MeV

(iv) 0.782 MeV

Ans: (i) 2.2 MeV.

7. Nuclear fission was first observed by –

(i) Rutherford.

(ii) Fermi.

(iii) Becquerel.

(iv) Hahn and Strassmann.

Ans: (iv) Hahn and Strassmann.

8. A typical fission reaction is –

(i) ²³⁵U + n → Ba + Kr + 3n

(ii) ²³⁵U → ²³⁶U

(iii) ¹H → ²H

(iv) None of these

Ans: (i) ²³⁵U + n → Ba + Kr + 3n

9. The main fuel in nuclear reactors is –

(i) Plutonium

(ii) Uranium-235

(iii) Thorium

(iv) Uranium-238

Ans: (ii) Uranium-235

10. A neutron is –

(i) Positively charged.

(ii) Negatively charged.

(iii) Uncharged.

(iv) Neutral with spin.

Ans: (iii) Uncharged.

11. The sun derives its energy from –

(i) Nuclear fission.

(ii) Combustion.

(iii) Nuclear fusion.

(iv) Chemical reactions.

Ans: (iii) Nuclear fusion.

12. The half-life of a radioactive substance is –

(i) Time to decay completely.

(ii) Time for activity to become half.

(iii) Time for mass to become zero.

(iv) Constant for all nuclei.

Ans: (ii) Time for activity to become half.

13. Activity of a radioactive substance is measured in –

(i) Curie.

(ii) Tesla.

(iii) Farad.

(iv) Newton.

Ans: (i) Curie.

14. Beta decay results in –

(i) Increase in Z.

(ii) Decrease in Z.

(iii) No change in Z.

(iv) Increase in A.

Ans: (i) Increase in Z.

15. The disintegration constant is related to half-life by –

(i) T_1/2 = 0.693/λ

(ii) T_1/2 = λ

(iii) T_1/2 = λ/0.693​

(iv) T_1/2 = 1/λ

Ans: (i) T_1/2 = 0.693/λ