Q. No.
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If the density of gold nucleus is X, then the density of silver nucleus will be:
1. 2X
2.
3. 4X
4. X
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After two alpha decays and four beta(-ve) decays, the atomic number:
| 1. | Decreases by 4 and mass number remains same. |
| 2. | Remains the same but the mass number increases by 4. |
| 3. | Remains the same but mass number decreases by 8. |
| 4. | Increases but mass number remains same. |
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The binding energies of the nuclei A and B are Ea and Eb respectively. If three atoms of the element B fuse to give one atom of element A and an energy Q is released, then Ea, Eb and Q are related as:
1. Ea – 3Eb = Q
2. 3Eb – Ea = Q
3. Ea + 3Eb = Q
4. Eb + 3Ea = Q
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The mass of a nucleus is 0.042 u less than the sum of the masses of all its nucleons. The binding energy per nucleon of the nucleus is near:
1. 4.6 MeV
2. 5.6 MeV
3. 3.9 MeV
4. 23 MeV
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In the nuclear decay given below:
the particles emitted in the sequence are:
| 1. | \(\beta, \alpha, \gamma \) | 2. | \(\gamma, \beta, \alpha \) |
| 3. | \(\beta, \gamma, \alpha \) | 4. | \(\alpha, \beta, \gamma\) |
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If M (A, Z), , and denote the masses of the nucleus , proton, and neutron respectively in units of u (1 u = 931.5 MeV/c2) and BE represents its binding energy in MeV, then:
| 1. | \(M(A, Z)=Z_p+(A-Z) M_n-B E / c^2\) |
| 2. | \(\mathrm{M}(\mathrm{A}, \mathrm{Z})=\mathrm{ZM}_{\mathrm{p}}+(\mathrm{A}-\mathrm{Z}) \mathrm{M}_{\mathrm{n}}+\mathrm{BE}\) |
| 3. | \(M(A, Z)=Z_p+(A-Z) M_n-B E\) |
| 4. | \(\mathrm{M}(\mathrm{A}, \mathrm{Z})=\mathrm{ZM}_{\mathrm{p}}+(\mathrm{A}-\mathrm{Z}) \mathrm{M}_{\mathrm{n}}+\mathrm{BE} / \mathrm{c}^2\) |
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The binding energy of deuteron is 2.2 MeV and that of is 28 MeV. If two deuterons are fused to form one then the energy released is:
| 1. | 25.8 MeV | 2. | 23.6 MeV |
| 3. | 19.2 MeV | 4. | 30.2 MeV |
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Fusion reaction takes place at a higher temperature because:
| 1. | atoms get ionized at high temperatures. |
| 2. | kinetic energy is high enough to overcome the Coulomb repulsion between nuclei. |
| 3. | molecules break up at a high temperature. |
| 4. | nuclei break up at a high temperature. |
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