Class 12 Physics MCQ Chapter 13 Nuclei

Class 12 Physics MCQ Chapter 13 Nuclei Solutions English Medium to each chapter is provided in the list so that you can easily browse through different chapters Class 12 Physics MCQ Chapter 13 Nuclei Question Answer in English and select need one. AHSEC Class 12 Physics Objective Type Question Answer As Per AHSEC New Book Syllabus Download PDF. AHSEC Physics MCQ Class 12 Solutions.

Class 12 Physics MCQ Chapter 13 Nuclei

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Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. AHSEC Class 12 Physics Multiple Choice Solutions in English Medium are part of All Subject Solutions. Here we have given AHSEC Class 12 Physics MCQ Question Answer English Medium for All Chapters, You can practice these here.

Nuclei

Chapter: 13

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

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