Chapter 14: Nuclei — Online MCQ Test
PHYSICS · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board
Practice Chapter 14: Nuclei with a free chapter-wise online MCQ test.
This chapter covers: This chapter details atomic nucleus composition mass defect binding energy per nucleon nuclear forces radioactivity decay laws alpha beta gamma decays nuclear fission and fusion..
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 14: Nuclei — Important Questions & Answers
What is the binding energy per nucleon of a nucleus?
- A. Total binding energy divided by the number of nucleons
- B. Total mass of the nucleus divided by the number of nucleons
- C. Mass defect multiplied by the number of nucleons
- D. Energy released by one neutron only
Answer: A. Total binding energy divided by the number of nucleons
Binding energy per nucleon is defined as the total binding energy of the nucleus divided by its mass number. It is used to compare the stability of different nuclei.
Binding energy per nucleon is defined as the total binding energy of the nucleus divided by its mass number. It is used to compare the stability of different nuclei.
Which of the following particles is emitted in alpha decay?
- A. Electron
- B. Helium nucleus
- C. Photon
- D. Neutron
Answer: B. Helium nucleus
In alpha decay, the nucleus emits an alpha particle, which is a helium nucleus containing 2 protons and 2 neutrons.
In alpha decay, the nucleus emits an alpha particle, which is a helium nucleus containing 2 protons and 2 neutrons.
A nucleus has 26 protons and 30 neutrons. Its mass number is
- A. 26
- B. 30
- C. 56
- D. 52
Answer: C. 56
Mass number is the sum of protons and neutrons. Here, 26 + 30 = 56.
Mass number is the sum of protons and neutrons. Here, 26 + 30 = 56.
Which of the following statements about nuclear fission is correct?
- A. Two light nuclei combine to form a heavy nucleus
- B. A heavy nucleus splits into two medium-mass nuclei
- C. Only gamma rays are emitted
- D. It occurs only in hydrogen nuclei
Answer: B. A heavy nucleus splits into two medium-mass nuclei
Nuclear fission is the splitting of a heavy nucleus into two medium-mass nuclei, usually accompanied by release of neutrons and large energy.
Nuclear fission is the splitting of a heavy nucleus into two medium-mass nuclei, usually accompanied by release of neutrons and large energy.
A nucleus emits an alpha particle. Which of the following changes occurs?
- A. Atomic number decreases by 2 and mass number decreases by 4
- B. Atomic number increases by 2 and mass number decreases by 4
- C. Atomic number decreases by 1 and mass number decreases by 1
- D. Atomic number remains unchanged and mass number decreases by 4
Answer: A. Atomic number decreases by 2 and mass number decreases by 4
An alpha particle contains 2 protons and 2 neutrons, so emission reduces the atomic number by 2 and the mass number by 4.
An alpha particle contains 2 protons and 2 neutrons, so emission reduces the atomic number by 2 and the mass number by 4.