BSEB Class 12 Physics Chapter 13 Nuclei MCQs In English Medium

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Class 12 Physics Chapter 13 Nuclei MCQs In English

1. The constituents of nucleus are

• (A) electrons and protons
• (B) protons and neutrons
• (C) neutrons and electrons
• (D) electrons, protons and neutrons

2. The radius of a nucleus is

• (A) directly proportional to its mass number
• (B) inversely proportional to its atomic weight
• (C) directly proportional to the cube root of its mass number
• (D) None of these

3. In nuclear reactors, the control rods are made of

• (A) cadmium
• (B) graphite
• (C) krypton
• (D) plutonium

4. The time in which radioactive substance become half of its intial amount is called

• (A) average life
• (B) half-life
• (C) time-period
• (D) decay constant

5. X-ray was discovered by

• (A) Becqueral
• (B) Marie curie
• (C) Roengton
• (D) Vanlaw

6. Mass is converted into energy according to the relation

• (A) E = mc²
• (B) E = mgh
• (C) E = 1/2 mc²
• (D) E = mgh / c²

7. Who discovered heavy Hydrogen ?

• (A) Uray
• (B) Thomson
• (C) Mosley
• (D) Fermi

8. Which one of following is charge less?

• (A) Alpha particle
• (B) Beta particle
• (C) Photon particle
• (D) Proton

9. Which of the relations is correct for radioactive atom ?

• (A) Half-life = Average life
• (B) Half-life = 2 x Average life
• (C) Half-life = 1.6931 x Average life
• (D) Half-life = 0.6931 x Average life

10. For a nuclear fusion process, suitable nuclei are

• (A) any nuclei
• (B) heavy nuclei
• (C) lighter nuclei
• (D) nuclei lying in the middle of periodic table

11. The equivalent energy of 1 g of substance is

• (A) 9 x 10¹³ J
• (B) 6 x 10¹² J
• (C) 3 x 10¹³ J
• (D) 6 x 10¹³ J

12. Which one of the following has maximum penetraing power

• (A) X-rays
• (B) cathode rays
• (C) α-rays
• (D) Y-rays

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FAQ. Class 12 Physics Chapter 13 Nuclei MCQs In English

Q1. How many electrons, protons and neutrons are there in a nucleus of atomic number 11 and mass number 24?

Ans:- The number of protons in the nucleus = atomic number, Z = 11 and the number of neutrons, N = A – Z = 24 -11 = 13. However, the nucleus does not contain electrons. Hence, the number of electrons in given nucleus = 0.

Q2. How is the radius of a nucleus related to its mass number?

Ans:- Radius of a nucleus, R = R₀ [A]^1/3, where R₀ = 1.2 fm.