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Radioactivity Multiple Choice Questions

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Radioactivity Practice Problems

Question 1
Age of a tree is determined using radio-isotope of
A
Cobalt
B
Phosphorus
C
Carbon
D
Iodine
Question 2
Radioactive nuclei that are injected into a patient collect at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can then be recorded by a detector. This procedure provides an important diagnostic tool called
A
Radiotracer technique
B
Gamma camera
C
Gamma ray spectroscopy
D
CAT scan
Question 3
A radioactive sample with a half life of 1 month has the label : “Activity=2 micro curies on 1.8.1991.'' What will be its activity two months later?
A
0.5 micro curies
B
8 micro curies
C
1.0 micro curies
D
4 micro curies
Question 4
What percentage of original radioactive atoms is left after five half lives?

Related: Chemical Equilibrium Questions and Answers

A
1%
B
0.3%
C
31%
D
3.125%
Question 5
Radioactive substance do not emit
A
Helium nucleus
B
Positron
C
Proton
D
Electron
Question 6
The half-life of radium is about 1600 years. Of 100 g of radium existing now, 25 g will remain unchanged after

Related: MCQ Questions on Fluid Mechanics

A
3200 years
B
2400 years
C
6400 years
D
4800 years
Question 7
Consider two nuclei of the same radioactive nuclide.  One of the nuclei was created in a supernova explosion 5 billion years ago. The other was created in a nuclear reactor 5 minutes ago. The probability of decay during the next time is
A
Different for each nuclei
B
Independent of the time of creation
C
Nuclei created in explosion decays first
D
Nuclei created in the reactor decays first
Question 8
The half life period of radium is 1600 years. The fraction of a sample of radium that would remain after 6400 years is
A
1/16
B
1/2
C
1/8
D
1/4
Question 9
A radioactive material has a half-life of 8 years. The activity of the material will decrease to about 1/8 of its original value in
A
256 year
B
128 year
C
64 year
D
24 year
Question 10
The half-life of radon is 3.8 days. Three forth of a radon sample decay in
A
11.4 days
B
15.2 days
C
7.6 days
D
5.02 days
Question 11
A radioactive element emits 200 particles per second. After three hours 25 particles per second are emitted. The half life period of element will be
A
70 minutes
B
60 minutes
C
50 minutes
D
80 minutes
Question 12
The half life period of a radioactive substance is 5 min. The amount of substance decayed in 20 min will be
A
6.25%
B
75%
C
93.75%
D
25%
Question 13
If half-life of a radioactive atom is 2.3 days, then its decay constant would be

Related: JEE Mains Chemistry Problems

A
2.3
B
0.2
C
0.1
D
0.3
Question 14
A radio isotope has a half life of 75 years. The fraction of the atoms of this material that would decay in 150 years will be
A
85.5%
B
62.5%
C
66.6%
D
75%
Question 15
If the half life of a radioactive sample is 10 hours, its mean life is
A
6.93 hours
B
14.4 hours
C
20 hours
D
7.2 hours
Question 16
A sample of radioactive element has a mass of 10 gm at an instant t = 0.The approximate mass of this element in the sample after two mean lives is
A
1.35 gm
B
2.50 gm
C
3.70 gm
D
6.30 gm
Question 17
Half-life is measured by
A
Wilson-Cloud chamber
B
Geiger-Muller counter
C
Spectroscopic method
D
Carbon dating
Question 18
16 gm sample of a radioactive element is taken from Bombay to Delhi in 2 hour and it was found that 1 gm of the element remained (undisintegrated). Half life of the element is

Related: Hydrogen and its compounds Problems

A
1 hour
B
1/4 hour
C
2 hour
D
1/2 hour
Question 19
Alpha rays emitted from a radioactive substance are

Related: Coordination Chemistry MCQs

A
Doubly ionised helium atom
B
Negatively charged particles
C
Uncharged particles having the mass equal to proton
D
Ionised hydrogen nuclei
Question 20
Half life of radioactive element depends upon
A
Pressure
B
Temperature
C
Nature of element
D
Amount of element present
Question 21
The electron emitted in beta radiation originates from

Related: AP and GP Questions and answers

A
Free electrons existing in nuclei
B
Photon escaping from the nucleus
C
Inner orbits of atoms
D
Decay of a neutron in a nucleus
Question 22
The S.I. unit of radioactivity is
A
Becqueral
B
Roentgen
C
Curie
D
Rutherford
There are 22 questions to complete.
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Vishal Arora

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