Nuclear Power Engineering

1

How many atoms are present in one gm-atom of an element ?

A. 2 x 1023
B. 6 x 1023
C. 6 x 1032
D. 5 x 105

2

Absorption/scattering cross-section of an element is expressed in "barn", which is equivalent to

A. 10-24 cm2
B. 10-12 cm
C. 1 Angstrom
D. 10-24 cm

3

The ratio of atomic radius to its nuclear radius is about

A. 105
B. 108
C. 1012
D. 1015

4

Which of the following gases has very high neutron capture cross-section, making it unsuitable as a coolant in nuclear reactor?

A. N2
B. He
C. CO2
D. H2

5

The specific heats of three gaseous coolants namely H2, He and CO2 in the increasing order are

A. CO2,He,H2
B. CO2,H2,He
C. H2,He,CO2
D. H2,CO2,He