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. |
Assertion (A): | In the process of nuclear fission, the fragments emit two or three neutrons as soon as they are formed and subsequently emit particles. |
Reason (R): | As the fragments contain an excess of neutrons over protons, emission of neutrons and particles bring their neutron/proton ratio to stable values. |
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): | If a heavy nucleus is split into two medium-sized parts, each of the new nuclei will have more binding energy per nucleon than the original nucleus. |
Reason (R): | Joining two light nuclei together to give a single nucleus of medium size means more binding energy per nucleon in the new 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): | Density of all the nuclei is same. |
Reason (R): | Radius of nucleus is directly proportional to the cube root of mass number. |
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): | Neutrons penetrate matter more readily as compared to protons. |
Reason (R): | Neutrons are slightly more massive than protons. |
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): | Mass of a moving photon varies inversely to the wavelength. |
Reason (R): | \(\times\)(speed of light)2 | Energy of the particle = 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. |