Nuclear physics

The following equation represents beta decay.

Which of the following is correct about element?

• Nucleon number increase by 1, proton number no change

• Nucleon number no change, proton number increase by 1

• Nucleon number no change, proton number no change

• Nucleon number increase by 1, proton number increase by 1

Answer explanation

Beta decay

Which of the following graphs shows the variation of half-life with time for a radioactive substance?

• 
• 
• 
• 

Answer explanation

Half-life does not change with time

The diagram shows the beginning of a chain reaction.

A chain reaction takes place because

• U is not stable.

• The two nuclei Kr and Ba are still radioactive.

• The energy during the nuclear reaction is very high.

• The number of neutrons released is continuously multiplying as time increases.

Answer explanation

Neutron produce will bombard on the others remaining radioactive substance and then will produce neutron that will do the same thing

Which of the following radioisotopes is to detect underground pipe leaks?

• Iron-56

• Cobalt-60

• Carbon-14

• Sodium-24

The nuclear reaction that takes place in nuclear reactor is

• Nuclear fission

• Nuclear fusion

• Nuclear decay

• Nuclear activation

In nuclear reactor, a moderator is used to

• Slow down the rate of fission

• Slow down the neutrons released during fission

• Absorb the neutrons released during fission

• Absorb the heat produced during fission