Class 6 Science Chapter 3 MCQ. We covered all the Class 6 Science Chapter 3 MCQ in this post for free so that you can practice well for the exam.
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Class 6 Science Chapter 3 Objective MCQ for Students
The half-life of a radioactive substance is 10 days; it means there will be
A) Complete decay of substance in 20 days
B) Complete decay of substance in 40 days
C) Decay of 3/4 part of substance in 20 days
D) Decay of 1/4 part of substance in 5 days
Option c – Decay of 3/4 part of substance in 20 days
The principle of the atomic bomb is based on
A) Nuclear fusion
B) Nuclear fission
C) Above both
D) Above none
Option b – Nuclear fission
The working principle of an atom bomb is nuclear fission of uranium, and the working principle of a hydrogen bomb is
A) Nuclear fusion of deuterium
B) Nuclear fission of thorium
C) Explosion of bomb involving hydrogen gas
D) Explosion involving dynamite and T.N.T.
Option a – Nuclear fusion of deuterium
A hydrogen bomb is based on the principle of
A) Controlled fusion reaction
B) Uncontrolled fusion reaction
C) Controlled fission reaction
D) Uncontrolled fission reaction
Option b – Uncontrolled fusion reaction
The hydrogen bomb was developed by
A) Edward Teller
B) Bernor Bon Bron
C) J. Robert Opan Heemar
D) Samual Cohen
Option a – Edward Teller
The ultimate product of the radioactive disintegration of uranium is
A) Lead
B) Radium
C) Thorium
D) Plutonium
Option a – Lead
A radioactive substance has a half-life of four months. Three-fourths of the substance would decay in
A) 3 months
B) 4 months
C) 8 months
D) 12 months
Option c – 8 months
If the half-life of a radioactive element is 5 years, then the fraction of the radioactive substance that remains after 20 years is
A) 1/2
B) 1/4
C) 1/8
D) 1/16
Option d – 1/16
We covered all the class 6 science chapter 3 mcq above in this post for free so that you can practice well for the exam.
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