physics : class12 Nuclear Stability : Mass Defect : Atoms and Nuclei MCQ Questions and Answers
Practice important
Nuclear Stability
MCQ questions and answers.
Page 1
of
1
|
10
MCQ Questions
1. A nucleus is generally more stable when its binding energy per nucleon is
A.
Very small
B.
Large
C.
Zero
D.
Negative
Correct Answer:
Large
Explanation:
A large binding energy per nucleon means the nucleons are held together strongly, making the nucleus more stable.
2. The mass defect of a nucleus is a measure of the mass converted into
A.
Electric charge
B.
Binding energy
C.
Neutron number
D.
Nuclear radius
Correct Answer:
Binding energy
Explanation:
The missing mass, called mass defect, is converted into nuclear binding energy according to E = mc². Greater binding energy generally indicates greater nuclear stability.
3. Which nucleus is expected to be more stable if both nuclei have the same number of nucleons?
A.
The nucleus with smaller binding energy per nucleon
B.
The nucleus with larger binding energy per nucleon
C.
The nucleus with zero mass defect
D.
The nucleus with no protons
Correct Answer:
The nucleus with larger binding energy per nucleon
Explanation:
For nuclei with the same total number of nucleons, the one with greater binding energy per nucleon is more strongly bound and therefore more stable.
4. A nucleus with a larger mass defect, for the same number of nucleons, generally has
A.
Lower binding energy per nucleon
B.
Greater binding energy per nucleon
C.
No nuclear force
D.
Fewer nucleons necessarily
Correct Answer:
Greater binding energy per nucleon
Explanation:
A larger mass defect corresponds to greater total binding energy. If the number of nucleons is the same, the binding energy per nucleon is also greater.
5. The most stable nuclei are generally found near which mass number region because their binding energy per nucleon is high?
A.
Very light nuclei only
B.
The middle-mass region
C.
The heaviest nuclei only
D.
Nuclei with one nucleon
Correct Answer:
The middle-mass region
Explanation:
Nuclei in the middle-mass region have comparatively high binding energy per nucleon and are therefore among the most stable nuclei.
6. When a heavy nucleus splits into medium-sized nuclei with greater binding energy per nucleon, the process can release energy. This process is called
A.
Nuclear fission
B.
Nuclear fusion
C.
Ionisation
D.
Electron emission
Correct Answer:
Nuclear fission
Explanation:
In nuclear fission, a heavy nucleus splits into smaller nuclei. Energy is released when the products are more tightly bound, having greater binding energy per nucleon.
7. When two light nuclei combine to form a more tightly bound nucleus, the process is called
A.
Nuclear fission
B.
Nuclear fusion
C.
Nuclear excitation
D.
Nuclear scattering
Correct Answer:
Nuclear fusion
Explanation:
Nuclear fusion combines light nuclei into a nucleus with greater binding energy per nucleon, and the increase in binding energy can be released as energy.
8. A stable nucleus has a binding energy per nucleon that is generally
A.
Sufficiently large to hold its nucleons together
B.
Exactly zero
C.
Always smaller than that of hydrogen
D.
Unrelated to mass defect
Correct Answer:
Sufficiently large to hold its nucleons together
Explanation:
A sufficiently large binding energy per nucleon indicates strong nuclear binding and helps maintain nuclear stability.
9. If the mass defect of a nucleus increases while its nucleon number remains unchanged, the nucleus becomes
A.
Less tightly bound
B.
More tightly bound
C.
Electrically neutral only
D.
Unable to contain neutrons
Correct Answer:
More tightly bound
Explanation:
An increased mass defect means increased binding energy. With the same number of nucleons, this means stronger binding and greater nuclear stability.
10. Which quantity is most directly used to compare the stability of nuclei of different sizes?
A.
Total number of electrons
B.
Binding energy per nucleon
C.
Atomic volume only
D.
Number of energy shells
Correct Answer:
Binding energy per nucleon
Explanation:
Binding energy per nucleon allows a fair comparison between nuclei of different sizes; a larger value generally indicates greater nuclear stability.
Short Questions and Answers
Practice short questions and answers related to
Nuclear Stability
.
Short questions are currently unavailable for this page.