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Chapter 18 Atomic and Nuclear Physics-16
1.
Upon which of the following, the process of radioactivity depends?
a) Temperature
b) Chemical combinations
c) Pressure
d) None of these
2.
The half-life of a certain isotope is 1 day. What is the quantity of the isotope after 2 days?
a) None of these
b) One half
c) One eighth
d) One quarter
3.
Upon which of the following, the process of radioactivity depends?
a) Magnetic fields
b) None of these
c) Electric fields
d) Chemical reactions
4.
The activity of a sample of a radioactive bismuth decreases to one-eight of its original activity in 15 days. Calculate the half-life of the sample?
a) 10 days
b) 5 days
c) 4 days
d) 3 days
5.
A radioactive element has a half-life of 40 minutes. The initial count rate was 1000 per minute. How long will it take for the count rate to drop to 250 per minutes?
a) 8 min
b) 12 min
c) 120 min
d) 80 min
6.
A radioactive element has a half-life of 40 minutes. The initial count rate was 1000 per minute. How long will it take for the count rate to drop to 125 per minutes?
a) 80 min
b) 12 min
c) 8 min
d) 120 min
7.
Which type of cells can be destroyed by gamma radiations?
a) (a) Both b and c
b) (c) Healthy cells
c) (d) None of these
d) What are the nuclei called which do not emit radiations naturally?
e) (b) Cancerous cells
f) Stable nuclei
8.
The non-radioactive elements can also be changed into radioactive elements by bombarding them with......................?
a) Protons
b) Neutrons
c) All of these
d) Alpha particles
9.
What are the artificial produced radioactive elements called?
a) Stable elements
b) Radioisotopes
c) Unstable elements
d) Radioactive elements
10.
A radioactive element has a half-life of 40 minutes. The initial count rate was 1000 per minute. How long will it take for the count rate to drop to 125 per minutes?
a) 2 hrs
b) 8 min
c) 80 min
d) 60 min
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