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Chapter 18 Atomic and Nuclear Physics-15
1.
What is the penetration power of beta particle?
a) Infinity penetration
b) Moderate penetration
c) Highest penetration
d) Least penetration
2.
What is the ionizing power of beta particle?
a) Least ionization
b) Infinity ionization
c) Highest ionization
d) Moderate ionization
3.
What is the charge on gamma ray?
a) Charge = -1
b) Charge = +2
c) Charge = -2
d) No charge
4.
What is the penetration power of gamma ray?
a) Least penetration
b) Moderate penetration
c) Highest penetration
d) Infinity penetration
5.
What is the ionizing power of gamma ray?
a) Highest ionization
b) Least ionization
c) Infinity ionization
d) Moderate ionization
6.
What is the time called during which half of the unstable radioactive nuclei disintegrate?
a) Half-life of the sample of radioactive element
b) Compiled-life of the sample of radioactive element
c) No life of the sample of radioactive element
d) Dual-life of the sample of radioactive element
7.
What is the half-life of radium-226?
a) 1620 years
b) 1602 years
c) 1260 years
d) 1206 years
8.
If No is the original number of atoms in the sample of radioactive element, then after ‘t’ half-lives number of atoms left in the sample will be?
a) Remaining atoms = Original atoms 1/3
t
b) Remaining atoms = Original atoms 1/4
t
c) Remaining atoms = Original atoms ½
t
d) Remaining atoms = Original atoms 2/6
t
9.
If No is the original number of atoms in the sample of radioactive element, then after ‘t’ half-lives number of atoms left in the sample will be?
a) N = No x ¼
t
b) N = No x 1/6
t
c) N = No x 1/3
t
d) N = No x ½
t
10.
The half-life is the time during which the number of atoms in a radioactive element becomes................?
a) 75%
b) 25%
c) 50%
d) 100%
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