What is the radius of iodine atom? (atomic No.53, Mass No.126)
2.5 × 10-11 m
2.5 × 10-9 m
7 × 10-9 m
7 × 10-6 m
In the nucleus of 11Na23, the number of protons, neutrons and electrons are
11, 12, 0
23, 12, 11
12, 11, 0
23, 11, 12
The average binding energy of a nucleon inside an atomic nucleus is about
8 MeV
8 eV
8 J
8 erg
In a fission reaction
the binding energy per nucleon of X and Y is 8.5 MeV whereas of 236U is 7.6 MeV. The total energy liberate will be about
2000 MeV
200 MeV
2 MeV
1 KeV
Which of the following statements is true for nuclear forces?
They obey the inverse square law of distance.
They obey the inverse third power law of distance.
They are short range forces.
They are equal in strength to electromagnetic forces.
The ratio of the radii of the nuclei 13Al27 and 52Te125 is approximately
6 :10
13 : 52
40 : 177
14 : 73
Energy released in the fission of a single 92U235 nucleus is 200 MeV. The fission rate of a 92U235 filled reactor operating at a power level of 5 W is
1. 56 × 10-10 s -1
1. 56 × 1011 s-1
1. 56 × 10-16 s-1
1. 56 × 10 -17 s-1
In a given reaction:
Radioactive radiations are emitted in the sequence of
α, β, γ
γ, β, α
γ, α, β
β, α, γ
The energy equivalent of one atomic mass unit is:
1.6 × 10-19 J
6.02 × 1023J
931 MeV
9.31 MeV
Which of the following is used as a moderator in nuclear reactors?
Plutonium
Cadmium
Heavy water
Uranium
