Quiz for Radioactivity

Q1: Who discovered radioactivity?

A. Marie Curie B. Henri Becquerel C. Rutherford D. Einstein

Q2: Radioactivity is the process of:

A. Emission of radiation from unstable nuclei B. Absorption of light C. Change in chemical properties D. Absorption of radiation

Q3: Which of the following is an alpha particle?

A. Helium nucleus B. Electron C. Proton D. Neutron

Q4: Beta radiation consists of:

A. Electrons B. Protons C. Neutrons D. Positrons

Q5: Gamma radiation is:

A. Electromagnetic radiation B. Particle radiation C. Electron radiation D. Neutron radiation

Q6: Radioactive decay follows:

A. Exponential law B. Linear law C. Quadratic law D. None

Q7: The time required for half the nuclei to decay is called:

A. Half-life B. Mean life C. Decay constant D. Radioactive period

Q8: The decay constant is:

A. Probability of decay per unit time B. Energy of nucleus C. Mass of nucleus D. Half-life

Q9: If the half-life of a substance is 5 years, what fraction remains after 10 years?

A. 1/4 B. 1/2 C. 1/8 D. None

Q10: In alpha decay, the atomic number changes by:

A. Decrease by 2 B. Increase by 2 C. No change D. Decrease by 1

Q11: In beta decay, the atomic number changes by:

A. Increase by 1 B. Decrease by 1 C. No change D. Increase by 2

Q12: Which type of radiation is most penetrating?

A. Gamma rays B. Alpha particles C. Beta particles D. Neutrons

Q13: The unit of activity of a radioactive source is:

A. Becquerel B. Curie C. Both A and B D. Gray

Q14: Which of the following is not a property of alpha particles?

A. Highly penetrating B. Helium nuclei C. Positively charged D. Massive compared to electrons

Q15: Beta particles are stopped by:

A. Thin sheet of aluminum B. Paper C. Lead D. Glass

Q16: Alpha particles are stopped by:

A. Paper B. Aluminum C. Lead D. Skin

Q17: Gamma rays are stopped by:

A. Lead B. Paper C. Aluminum D. Wood

Q18: Radioactive dating is based on:

A. Half-life of isotopes B. Atomic mass C. Electron configuration D. Isotope abundance

Q19: The mean life (τ) is related to half-life (T½) by:

A. τ = T½ / ln 2 B. τ = T½ × ln 2 C. τ = 2 × T½ D. No relation

Q20: Spontaneous emission of particles from nucleus is called:

A. Radioactive decay B. Nuclear fission C. Nuclear fusion D. Ionization