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This mock test of Nuclear Physics Nat Level – 1 for Physics helps you for every Physics entrance exam.
This contains 10 Multiple Choice Questions for Physics Nuclear Physics Nat Level – 1 (mcq) to study with solutions a complete question bank.
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*Answer can only contain numeric values

QUESTION: 1

The half life of a radioactive substance is 3*h* and its activity is 1µ*Ci*. Then the activity after 9*h* will be (in µ*Ci*)

Solution:

The correct answer is: 0.125

*Answer can only contain numeric values

QUESTION: 2

An electron positron pair (rest mass of each particle = 0.51 MeV) is produced by a γ -ray photon of energy 2.42 MeV. The K.E. (in MeV) imparted to each of the charged particles shall be :

Solution:

Rest mass energy + kinetic energy = energy of gamma photon

The correct answer is: 0.7

*Answer can only contain numeric values

QUESTION: 3

The probability of a radioactive atoms to survive 5 times longer than its half value period is.

Solution:

Decay period = Half life × No. of half lives

The correct answer is: 0.03125

*Answer can only contain numeric values

QUESTION: 4

A radioactive nuclie decay as follows If mass number and atomic number of *A* are 180 and 72 respectively then atomic number for *A*_{4} will be.

Solution:

_{72}A^{180} -^{α}->_{70}A_{1}^{176} -^{β}->_{71}A_{2}^{176} -^{α}->_{69}A_{3}^{172}-^{γ}->_{69}A_{4}^{174}+γ

The correct answer is 69.

*Answer can only contain numeric values

QUESTION: 5

After emission of an α -particle by a radioactive element _{84}X^{212}, the resulting mass number would be.

Solution:

The correct answer is: 208

*Answer can only contain numeric values

QUESTION: 6

If the mass of proton = 1.008 amu and mass of neutron = 1.009 amu then binding energy (in MeV*)* per nucleon for _{4}Be^{9} (mass = 9.012 amu) would be :

Solution:

Binding energy

The correct answer is: 6.72

*Answer can only contain numeric values

QUESTION: 7

After a time equal to four half lives, the percentage of radioactive material remaining undecayed is :

Solution:

The correct answer is: 6.25

*Answer can only contain numeric values

QUESTION: 8

The half-life of cobalt 60 is 5.25 years. How long after a new sample is delivered, will the activity have decreased to about one third (1/3) of its original value. (Provide the time in years).

Solution:

The correct answer is: 8.3

*Answer can only contain numeric values

QUESTION: 9

The mean life of a radioactive sample is 100 years. Then after 100 years, what percentage of the sample remains active.

Solution:

The correct answer is: 37

*Answer can only contain numeric values

QUESTION: 10

10^{14} fissions per second are taking place in a nuclear reactor having efficiency 40%. The energy released per fission is 250 MeV. The power output (in Watts) of the reactor is :

Solution:

Power output 0.4 x power input = 0.4 x 250 x 10^{6} x 1.6 x 10^{-19} x 10^{14} = 1600W.

The correct answer is: 1600

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