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Chapter 18 Atomic and Nuclear Physics-20
1.
Which reaction takes place when a heavy nucleus fissions into two smaller nuclei by absorbing a low energy neutron?
a) Chemical reaction
b) Nuclear fusion reaction
c) Nuclear fission reaction
d) Biological reaction
2.
Some rocks contain unstable potassium isotope……………?
a) K-30
b) K-20
c) K-40
d) K-50
3.
For how much time, U*-236 lasts before nuclear fission reaction?
a) For a few minutes
b) For a few second
c) For a few hours
d) For a few days
4.
How many neutrons are released when U-325 is bombarded with low energy neutron?
a) 1
b) 4
c) 3
d) 2
5.
U*-236 is a/an ..................state that lasts only for a fraction of second before splitting into nuclei X and Y?
a) Static
b) Median
c) Intermediate
d) Higher mediate
6.
Three neutrons are released when U-325 is bombarded with………………?
a) Fast moving electron
b) Fast moving neutron
c) Slow moving neutron
d) Slow moving electron
7.
Three neutrons are released when U-325 is bombarded with………………?
a) High energy neutron
b) High energy electron
c) Low energy neutron
d) Low energy electron
8.
What are the pieces called that are produced after fission reaction?
a) Fission dictes
b) Fission fragments
c) Fusion dictes
d) Fusion fragments
9.
When nuclear fission was first observed?
a) 1993
b) 1933
c) 1939
d) 1399
10.
How many neutrons are released when U-325 is bombarded with slow moving neutron?
a) 4
b) 1
c) 2
d) 3
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