Assertion (A): | \(\beta^{-} \text-\) particles. | Radioactive nuclei emits
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. |
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. |
Assertion (A): | \(\beta\)-particles when they are emitted is higher than the mass of electrons obtained by other means. | The mass of
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. |
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. |
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. |
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. |
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): | \(\beta\)-particles emitted in the decay of 90Sr damage the bone marrow. | The energetic
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. |
Assertion (A): | Heavy water is a better moderator than normal water. |
Reason (R): | Heavy water absorbs neutrons more efficiently than normal water. |
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. |
Assertion (A): | The mass of a nucleus can be either less than or more than the sum of the masses of nucleons present in it. |
Reason (R): | The density of nuclear matter is dependent on the size of 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. |
Assertion (A): | Isotopes of an element can be separated by using a mass spectrometer. |
Reason (R): | Separation of isotopes is possible because of the difference in electron numbers of isotopes. |
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. |