RADIATION PHYSICS MCQs + Answers
Volume 1
, SECTION A — FUNDAMENTALS OF ATOMS &
RADIOACTIVITY
1. Which of the following particles determines the atomic number of
an element?
A. Neutrons
B. Electrons
C. Protons
D. Nucleons
Answer: C
2. The mass number (A) of an atom represents:
A. Neutrons only
B. Protons + Neutrons
C. Electrons + Protons
D. Protons only
Answer: B
3. Radioactive decay that results in the emission of a helium nucleus
is:
A. Beta decay
B. Gamma emission
C. Alpha decay
D. Internal conversion
Answer: C
4. In β⁻ decay, which particle is emitted?
A. Positron
B. Electron
C. Neutron
D. Proton
Answer: B
5. The law describing decay over time is:
A. Beer-Lambert Law
B. Exponential Decay Law
C. Coulomb’s Law
D. Stefan-Boltzmann Law
Answer: B
Volume 1
, SECTION A — FUNDAMENTALS OF ATOMS &
RADIOACTIVITY
1. Which of the following particles determines the atomic number of
an element?
A. Neutrons
B. Electrons
C. Protons
D. Nucleons
Answer: C
2. The mass number (A) of an atom represents:
A. Neutrons only
B. Protons + Neutrons
C. Electrons + Protons
D. Protons only
Answer: B
3. Radioactive decay that results in the emission of a helium nucleus
is:
A. Beta decay
B. Gamma emission
C. Alpha decay
D. Internal conversion
Answer: C
4. In β⁻ decay, which particle is emitted?
A. Positron
B. Electron
C. Neutron
D. Proton
Answer: B
5. The law describing decay over time is:
A. Beer-Lambert Law
B. Exponential Decay Law
C. Coulomb’s Law
D. Stefan-Boltzmann Law
Answer: B
