Nuclei Test

Result

Nuclei Test - 6

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Question 1
1 / -0

The antiparticle of electron is

A
Proton

B
Positron

C
α –particle

D
β –particle

Solution

Because positron has same mass as that of the electron but has charge of +1.
Question 2
1 / -0

Nuclear fusion is possible

A
only between light nuclei

B
only between heavy nuclei

C
between both light and heavy nuclei

D
only between nuclei which are stable against β -decay

Solution

When we fuse two nuclei together , we have to bring them close together . For this work is to be done against the force of repulsion. This need a huge amount of energy. For heavy nuclei this energy would be much larger. This leads to less efficiency of the process. For this fusion reaction takes place between light nuclei although it can occur between heavy nuclei.
Question 3
1 / -0

When a hydrogen bomb explodes, which of the following is used?

A
fission

B
fusion

C
both

D
neither of two

Solution

Hydrogen bomb combines both nuclear fission and a different process known as nuclear fusion to produce a far, far more powerful blast.
The first stage of a hydrogen bomb involves a fission explosion. The explosion, in turn, leads to a second stage - fusion.
Question 4
1 / -0

If M is the atomic mass, A is the mass number then (M – A)/A is called

A
Packing fraction

B
Fermi energy

C
Binding energy

D
Mass defect

Solution

Mass defect per nucleon is defined as packing fraction. Packing fraction is the measure of a loss or gain of total mass in a group of nucleons when they are brought together to form an atomic nucleus . It is the measure of stability of nucleus. It is usually expressed as parts per 10,000.