Nuclei - Online Test
Q1. Nuclides with same neutron number N but different atomic numbers Z are called
Answer : Option B
Explaination / Solution:
Two nuclides are isotones if they have the same neutron number N, but different proton number Z. For example, boron-12 and carbon-13 nuclei both contain 7 neutrons, and so are isotones .
Q2. A nucleus of mass number A has a radius R such that
Answer : Option D
Explaination / Solution:
A stable nucleus has approximately constant density. Packing protons and neutrons in the nucleus gives approximately the same total size result as packing hard spheres of a constant size (like marbles) into a tight spherical or almost spherical bag.
Q3. Nuclear mass M is found to be
Answer : Option D
Explaination / Solution:
This phenomenon is called mass defect. The mass defect of a nucleus represents the mass equivalent of the energy of binding of the nucleus, and is the difference between the mass of a nucleus and the sum of the masses of the nucleons of which it is composed.
Q4. The difference in mass of a nucleus and its constituents is called
Answer : Option C
Explaination / Solution:
The mass defect of a nucleus represents the mass of the energy of binding of the nucleus, and is the difference between the mass of a nucleus and the sum of the masses of the nucleons of which it is composed.
Q5. Correct expression for mass defect Δm is
Answer : Option C
Explaination / Solution:
Measurements have shown that the mass of a particular atom is always slightly less than the sum of the masses of the individual neutrons, protons, and electrons of which the atom consists. The difference between the mass of the atom and the sum of the masses of its parts is called the mass defect.
Here Z is the number of protons (atomic number) and (A-Z) is the number of neutrons, A being the total number of nucleons (mass number).
Q6.
the binding energy of the nucleus is related to mass defect Δm by
Answer : Option D
Explaination / Solution:
This follows from the mass energy equivalence relation of the special theory of relativity, proposed by Einstein.
Q7. In the mass number range A = 30 to 170, the binding energy per nucleon is
Answer : Option D
Explaination / Solution:
Binding energy per nucleon vs atomic mass curve
Q8. Energies associated with nuclear processes are
Answer : Option A
Explaination / Solution:
No Explaination.
Q9. The disintegration energy is
Answer : Option C
Explaination / Solution:
No Explaination.
Q10. Radioactivity is the phenomenon in which
Answer : Option C
Explaination / Solution:
No Explaination.
