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Q. No.Subtopic: Â Nucleus |
Level 4: Below 35%
Hints
Choose the incorrect statements regarding binding energy per nucleon:
| 1. | Binding energy per nucleon is practically constant for nuclei with mass numbers between \(30\) and \(170\). |
| 2. | Binding energy per nucleon is maximum for \(_{56}\mathrm{Fe}\) (equal to \(8.75~\text{MeV}\)). |
| 3. | Binding energy per nucleon for \(_{6}\mathrm{Li}\) is lower compared to \(_{4}\mathrm{He}\). |
| 4. | Higher the binding energy per nucleon, the more unstable is the nucleus. |
Subtopic: Â Nuclear Binding Energy |
 74%
Level 2: 60%+
Hints
Of the radiations/particle beams mentioned below, which one causes maximum ionisation when passing through matter?
1. neutron beam
2. \(\beta\)-rays
3. \(\gamma \)-rays
4. infra-red light
1. neutron beam
2. \(\beta\)-rays
3. \(\gamma \)-rays
4. infra-red light
Subtopic: Â Types of Decay |
Level 3: 35%-60%
Hints
Given below are two statements:
| Assertion (A): | The density of the 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: Â Nucleus |
 66%
Level 2: 60%+
Hints
In a nuclear reaction the following quantities is/are conserved:
| 1. | kinetic energy | 2. | mass |
| 3. | momentum | 4. | all the above |
Subtopic: Â Mass-Energy Equivalent |
Level 3: 35%-60%
Hints
In an exoergic nuclear reaction (i.e. energy is released in the reaction), let
Then:
1. \(E_1>E_2\)
2. \(E_2>E_1\)
3. \(E_1=E_2\)
4. \(\dfrac{E_1}{A_1}=\dfrac{E_2}{A_2}\)
| 1. | \(E_1\): total binding energy of initial nuclei |
| 2. | \(E_2\): total binding energy of final nuclei |
| 3. | \(A_1\): total number of nucleons of initial nuclei |
| 4. | \(A_2\): total number of nucleons of final nuclei |
1. \(E_1>E_2\)
2. \(E_2>E_1\)
3. \(E_1=E_2\)
4. \(\dfrac{E_1}{A_1}=\dfrac{E_2}{A_2}\)
Subtopic: Â Nuclear Binding Energy |
 53%
Level 3: 35%-60%
Hints
The nuclear radius of which of the following nuclei is approximately twice that of deuterium \((_1\mathrm{H}^2)\)?
| 1. | \(_2\mathrm{He}^4\) | 2. | \(_3\mathrm{Li}^8\) |
| 3. | \(_4\mathrm{Be}^8\) | 4. | \(_8\mathrm{O}^{16}\) |
Subtopic: Â Nucleus |
Level 3: 35%-60%
Hints
During a \(\beta\)-decay, fast electrons are found to have been emitted. These electrons come from:
| 1. | the outermost atomic shell |
| 2. | the innermost atomic shell |
| 3. | the conduction band |
| 4. | the nucleus |
Subtopic: Â Types of Decay |
Level 3: 35%-60%
Hints
In a nuclear reaction (involving atomic nuclei only), the sum of kinetic energies of the product nuclei was found to be greater than that of the reactants. This means that:
| 1. | some nucleons are created |
| 2. | some nucleons are destroyed |
| 3. | energy is converted into mass |
| 4. | mass is converted into energy |
Subtopic: Â Mass-Energy Equivalent |
 65%
Level 2: 60%+
Hints
A nuclear reaction occurs where a nucleus \(X\) breaks up into two separated nuclei \(Y\) and \(Z\text:~~~~X\longrightarrow Y+Z \)
Let, the nuclear radii of \(X,Y,Z\) be \(r_{_X},r_{_Y},r_{_Z}.\) Then, which of the following, is (nearly) correct?
Let, the nuclear radii of \(X,Y,Z\) be \(r_{_X},r_{_Y},r_{_Z}.\) Then, which of the following, is (nearly) correct?
| 1. | \(r_{_X}=r_{_Y}+r_{_Z}\) | 2. | \(\Large\frac{1}{r_{_X}}=\frac{1}{r_{_Y}}+\frac{1}{r_{_Z}}\) |
| 3. | \(r_{_X}=|r_{_Y}-r_{_Z}|\) | 4. | \(r_{_X}^3=r^3_{_Y}+r^3_{_Z}\) |
Subtopic: Â Nucleus |
 68%
Level 2: 60%+
Hints
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