Nuclear Power Engineering MCQs

Question 1

The atomic weight and atomic number of an element are A and Z respectively. What is the number of neutrons in the atom of that element?

Accepted Answer

A- Z

Answer

A+Z

Answer

A

Answer

Z

Question 2

The largest stable nucleus is

Accepted Answer

U-235

Answer

U-238

Answer

Pb-206

Answer

Bi-209

Question 3

The half life period of a radioactive element depends on its

Accepted Answer

None of these

Answer

Temperature

Answer

Pressure

Answer

Amount

Question 4

Which of the following is not a good moderating material?

Accepted Answer

All of the above

Answer

Concrete

Answer

Boron

Answer

18/8 stainless steel

Question 5

Pick out the wrong statement.

Accepted Answer

Positron is heavier than a proton

Answer

The nucleus of a hydrogen atom is identical with a proton

Answer

A, β-ray particle is identical with an electron

Answer

Mass of an electron is about $${\frac{1}{{1800}}^{{	ext{th}}}}$$ of the lightest nucleus

Question 6

The half life period of a radiactive element is 100 days. After 400 days, one gm of the element will be reduced to __________ gm.

Accepted Answer

$$\frac{1}{{16}}$$

Answer

$$\frac{1}{4}$$

Answer

$$\frac{1}{8}$$

Answer

$$\frac{1}{2}$$

Question 7

The emission of an a-particle causes the resultant nucleus to have

Accepted Answer

More atomic weight and less atomic number

Answer

Less atomic weight and less atomic number

Answer

Less atomic weight and more atomic number

Answer

None of these

Question 8

The disintegration rate of a radioactive element

Accepted Answer

Progressively decreases

Answer

Progressively increases

Answer

Remains constant throughout

Answer

May increase or decrease depending on the material

Question 9

H 2 is a better coolant than CO 2 , due to its relatively

Accepted Answer

Higher specific heat

Answer

Lower density

Answer

Non-reactivity to uranium

Answer

Lower neutron capture cross-section