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Chapter 18 Atomic and Nuclear Physics-9
1.
How much background radiations are emitted by cosmic rays?
a) 20 %
b) 21 %
c) 57 %
d) 2 %
2.
What is the nature of alpha particle?
a) Cosmic radiations
b) Background radiations
c) Secondary radiations
d) Radioactive radiations
3.
How much background radiations are emitted by fallout?
a) 21 %
b) 57 %
c) 20 %
d) 2 %
4.
What is the nature of electrons?
a) Radioactive radiations
b) Secondary radiations
c) Background radiations
d) Cosmic radiations
5.
How much background radiations are emitted by natural radioactivity in rock and soil?
a) 20 %
b) 2 %
c) 21 %
d) 57 %
6.
What is the spontaneous process called in which a parent unstable nuclide changes into a more stable daughter nuclide with the emission of radiations?
a) Background radiations
b) Natural radioactivity
c) Nuclear radioactivity
d) Nuclear transmutation
7.
In which decay, the proton number Z of the parent nuclide reduces by 2?
a) Alpha-decay
b) Gamma-decay
c) None of these
d) Beta- decay
8.
In which decay, the atomic number Z of the parent nuclide reduces by 2?
a) Alpha-decay
b) Beta- decay
c) Gamma-decay
d) All of these
9.
In which decay, the nucleon number Z of the parent nuclide decreases by 4?
a) None of these
b) Beta- decay
c) Gamma-decay
d) Alpha-decay
10.
How much background radiations are emitted by radon gas?
a) 57 %
b) 21 %
c) 2 %
d) 20 %
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