1. . The charge on α–particle is:
(A) + e
(B) – e
(C) + 3e
(D) + 2e
2. . The interaction of radioactive particles depends on:
(A) Mass of particle
(B) Energy of particle
(C) All of these
(D) Charge of particle
3. . The energy required to produce an ion pair during ionization is:
(A) 40 eV
(B) 35 eV
(C) 25 eV
(D) 30 eV
4. . The number of ion–pairs produced by 7.7 MeV of energy are:
(A) 3 × 10⁴
(B) 2.1 × 10³
(C) 2 × 10⁵
(D) 1.2 × 10⁵
5. . An α–particle ionizes the atom through:
(A) Electrostatic repulsion
(B) Direct interaction
(C) Electrostatic attraction
(D) Photoelectric effect
6. . A β–particle can ionize an atom through:
(A) Compton effect
(B) Photoelectric effect
(C) Electrostatic attraction
(D) Electrostatic repulsion
7. . A β–particle has more penetrating power than α–particle by:
(A) 10 times
(B) 1/10 times
(C) 1000 times
(D) 100 times
8. . The path of β–particle is:
(A) Straight
(B) Circular
(C) Zigzag
(D) Elliptical
9. . Gamma rays are electromagnetic waves like:
(A) X–rays
(B) All of these
(C) Microwaves
(D) Light waves
10. . Which one of the following radiations is extremely penetrating:
(A) ϒ–rays
(B) β–rays
(C) α–rays
(D) Neutrons
11. . Which of the following will be better shield against ϒ–rays:
(A) Air
(B) Aluminum
(C) Lead
(D) Heavy water
12. . The most useful tracer is:
(A) Ni – 63
(B) Iodine –131
(C) Cobalt – 60
(D) Carbon–14