Given below are two statements: 
Assertion (A): The density of nucleus is much higher than that of ordinary matter.
Reason (R): Most of the mass of the atom is concentrated in the nucleus while the size of this nucleus is almost \(10^5\) times smaller.
  
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Nucleus |
From NCERT
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Graph given below shows the variation of binding energy per nucleon, Ebn as a function of mass number. For nuclei with mass number A such that, 30 < A < 170, Ebn is almost constant because nuclear forces are:

 

1. Short-ranged 

2. Medium-ranged

3. Long-ranged

4. None of the above

Subtopic:  Nuclear Binding Energy |
 68%
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Graph gives the variation of potential energy of a pair of nucleons as a function of their separation, r. From the graph it can be concluded that the force between nucleons is attractive for distances:

   

1. Less than ro

2. Greater than ro

3. Less than ro2

4. Less than ro4

Subtopic:  Nuclear Binding Energy |
 56%
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Given below are two statements: 
Assertion (A): Radioactive nuclei emits \(\beta^- -\) particles.
Reason (R): Electrons exist inside the nucleus.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
Subtopic:  Types of Decay |
 74%
From NCERT
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Given below are two statements: 
Assertion (A): Forces (nuclear) acting between proton-proton \((\mathrm{f}_{\mathrm{pp}})\)proton-neutron \((\mathrm{f}_{\mathrm{pn}})\) and neutron-neutron \((\mathrm{f}_{\mathrm{nn}})\) are such that \(\mathrm{f}_{\mathrm{pp}}<\mathrm{f}_{\mathrm{pn}}=\mathrm{f}_{\mathrm{nn}}\).
Reason (R): Electrostatic force of repulsion between two protons reduces nuclear forces between them.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.



 
 
Subtopic:  Nuclear Binding Energy |
 64%
From NCERT
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Given below are two statements: 
Assertion (A): The mass of \(\beta\)-particles when they are emitted is higher than the mass of electrons obtained by other means.
Reason (R): \(\beta\)-particles and electrons, both are similar particles.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.



 
Subtopic:  Types of Decay |
From NCERT
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Given below are two statements: 
Assertion (A): Electron capture occurs more than positron emission in a heavy nucleus.
Reason (R): In a heavy nucleus, electrons are relatively close to the nucleus.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.


 
Subtopic:  Types of Decay |
 65%
From NCERT
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Given below are two statements: 
Assertion (A): All nuclei are not of the same size.
Reason (R): The size of the nucleus depends on atomic mass.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.


 
Subtopic:  Nucleus |
 76%
From NCERT
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Given below are two statements: 
Assertion (A): The ratio of time taken for light emission from an atom to that for the release of nuclear energy in fission is 1:100.
Reason (R): Time taken for the light emission from an atom is of the order of 10-8s.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.


 
 
Subtopic:  Nuclear Energy |
 55%
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Given below are two statements: 
Assertion (A): 90Sr from radioactive fallout from a nuclear bomb ends up in the bones of human beings through the milk consumed by them. It causes impairment of the production of red blood cells.
Reason (R): The energetic \(\beta\)-particles emitted in the decay of 90Sr damage the bone marrow.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
.
Subtopic:  Types of Decay |
 90%
From NCERT
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