Nuclei  MCQs

MCQs of Nuclei

Showing 131 to 138 out of 138 Questions
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131.
If the binding energy per nucleon Li73 and He42 nucei are 5.6 MeV and 7.06 Mev respectively, then in the reaction       P +   Li73 → 2(He42)energy of proton must be _____ MeV.
(a) 1.46
(b) 39.2
(c) 28.24
(d) 17.28
Answer:

Option (d)

132.
If the number of undisintegrated nuclei at time t is given by N = N0e-λt, what is the number of nuclei disintegrated between the time t1 and t2 ?
(a) N0(e-λt2 - e-λt1)
(b) N0(e-λt1 - e-λt2)
(c) N0(eλt2 - eλt1)
(d) N0(eλt1 - eλt2)
Answer:

Option (b)

133.
The energy released by the fission of one uranium atom is 200 MeV. The number of fission per second required to produce 6.4 W power is _____ .
(a) 1011
(b) 2 × 1011
(c) 1010
(d) 2 × 1010
Answer:

Option (b)

134.
If by successive disintegration of 92U238, the final product obtained is 82Pb206, then how many number of α and β particles are emitted ?
(a) 8 and 6
(b) 6 and 8
(c) 12 and 6
(d) 8 and 12
Answer:

Option (a)

135.
The unit of Rydberg constant is _____ .
(a) Ryd
(b) m
(c) m-
(d) eV
Answer:

Option (c)

136.
An accelerated charge emits _____ .
(a) Charge
(b) Heat
(c) Energy
(d) Angular Momentum
Answer:

Option (c)

137.
The atomic mass number of an element is
(a) Equal to or greater than its atomic number
(b) Always greater than its atomic number
(c) Always smaller than its atomic number
(d) Greater than its atomic number in some cases and smaller in other cases
Answer:

Option (a)

138.
A radioactive element P disintegrates in three stages as under and converts into element S.P → Q + He24, Q → R + e-, R → S + e- then
(a) P and Q are isotopes
(b) P and R are isobars
(c) P and S are isotopes
(d) P and Q are isobars
Answer:

Option (c)

Showing 131 to 138 out of 138 Questions
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