Engineering :: Nuclear Engineering

@ : Home > Chemical Engineering > Nuclear Engineering

111.

The half-life period of a radioactive element depends on

A.	pressure	B.	temperature
C.	amount of element present	D.	none of these

112.

The half-life period of a radioactive element is 10 years. How long it takes to reduce to 12.5% of its original weight?

A.	20 years	B.	30 years
C.	40 years	D.	125 years

113.

Two grams of radioactive substance is reduced to 0.25 gm during a period of 60 days. The half-life period is

A.	10 days	B.	15 days
C.	20 days	D.	30 days

114.

The radioactive decay rate of a radioactive element is found to be 103 disintegrations/second at a certain time. If the half-life of the element is one second the decay rate after one second is

A.	103/	B.	103/2
C.	2 x 103	D.	103/2

115.

Which of the following statements is wrong for deuterium and tritium?

A.	Both have same number of protons	B.	Both have same number of electrons
C.	Both have same number of neutrons	D.	Both form neutral exides

116.

The number of neutrons in the nucleus of tritium is

A.	1	B.	2
C.	3	D.	4

117.

Tritium is Beta emitter. Its decay product is

A.	hydrogen ion	B.	deuterium
C.	helium	D.	lithium

118.

Deuterium differs from hydrogen in

A.	chemical properties	B.	physical properties
C.	both physical and chemical properties	D.	radioactive properties

119.

Tritium is

A.	radioactive deuterium	B.	obtained by bombardment of 4Be9 particle
C.	prepared by the electrolysis of water	D.	prepared by the electrolysis of heavy water

120.

Deuterium atom has

A.	2 electrons in the outermost orbit	B.	two protons in the nucleus
C.	two neutrons in the nucleus	D.	one proton and one neutron in the nucleus