Chapter 6: Nuclear Physics — Online MCQ Test
SCIENCE · CLASS 10th · Tamil Nadu State Board
Practice Chapter 6: Nuclear Physics with a free chapter-wise online MCQ test.
This chapter covers: Focusing on radioactivity this chapter covers natural and artificial radioactivity alpha beta gamma decay and nuclear reactions. Students study nuclear fission nuclear fusion radia....
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Chapter 6: Nuclear Physics — Important Questions & Answers
What is radioactivity?
- A. Spontaneous emission of radiations from unstable atomic nuclei
- B. Emission of light from heated metals
- C. Flow of electrons through a conductor
- D. Splitting of molecules by electricity
Answer: A. Spontaneous emission of radiations from unstable atomic nuclei
Radioactivity is the spontaneous disintegration of unstable nuclei with emission of alpha, beta or gamma radiations.
Radioactivity is the spontaneous disintegration of unstable nuclei with emission of alpha, beta or gamma radiations.
An alpha particle is identical to the nucleus of which atom?
- A. Hydrogen
- B. Helium
- C. Lithium
- D. Carbon
Answer: B. Helium
An alpha particle consists of 2 protons and 2 neutrons, which is the nucleus of a helium atom.
An alpha particle consists of 2 protons and 2 neutrons, which is the nucleus of a helium atom.
During beta decay, what happens to the atomic number and mass number of the parent nucleus?
- A. Atomic number decreases by 2, mass number decreases by 4
- B. Atomic number increases by 1, mass number remains unchanged
- C. Atomic number remains unchanged, mass number decreases by 1
- D. Atomic number decreases by 1, mass number increases by 1
Answer: B. Atomic number increases by 1, mass number remains unchanged
In beta decay, a neutron changes into a proton and emits a beta particle, so atomic number increases by 1 while mass number remains the same.
In beta decay, a neutron changes into a proton and emits a beta particle, so atomic number increases by 1 while mass number remains the same.
Which of the following statements is NOT correct about radioactive radiations?
- A. Alpha rays have low penetrating power
- B. Beta rays are more penetrating than alpha rays
- C. Gamma rays are not affected by electric or magnetic fields
- D. Alpha rays are negatively charged particles
Answer: D. Alpha rays are negatively charged particles
Alpha rays are positively charged particles, not negatively charged. Beta rays are negatively charged electrons.
Alpha rays are positively charged particles, not negatively charged. Beta rays are negatively charged electrons.
Complete the nuclear reaction: ²³⁵₉₂U + ¹₀n → ¹⁴¹₅₆Ba + ⁹²₃₆Kr + x ¹₀n + energy. What is the value of x?
- A. 1
- B. 2
- C. 3
- D. 4
Answer: C. 3
Mass numbers must balance: 235 + 1 = 141 + 92 + x, so x = 3. Atomic numbers are also balanced.
Mass numbers must balance: 235 + 1 = 141 + 92 + x, so x = 3. Atomic numbers are also balanced.