The binding energy per nucleon is maximum in case of
2He4
26Fe56
56Ba141
92U235
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
The energy equivalent of one atomic mass unit is:
1.6 × 10-19 J
6.02 × 1023J
931 MeV
9.31 MeV
Atomic weight of Boron is 10.81 and it has two isotopes . Then the ratio of atoms of in nature would be :
19.81
10.11
15.16
81.19
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.
Which of the following is positively charged?
α -particle
β - particle
γ -particle
X -rays
A sample of radioactive elements contains 4 x 1010 active nuclei. If half-life of element is 10 days, then the number of decayed nuclei after 30 days is.
0.5 × 1010
2 × 1010
3.5 × 1010
1 × 1010
Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is
to control energy released in the reactor
to absorb neutrons and stop chain reaction
to cool the reactor
to slow down the neutrons to thermal energies
The stable nucleus that has a radius half that of Fe56 is
Li7
Na21
S16
Ca40
Alpha particles are
2 free protons
helium atoms
singly ionized helium atoms
doubly ionized helium atoms
