- 1(current)
Q. No.\({ }_0^1 \mathrm{n}+{ }_{92}^{235} \mathrm{U} \rightarrow{ }_{92}^{236} \mathrm{U} \rightarrow{ }_{56}^{144} \mathrm{Ba}+{ }_{36}^{89} \mathrm{Kr}+\text { neutrons }.\)
How many neutrons are produced in this reaction?
| 1. | \(1\) | 2. | \(2\) |
| 3. | \(3\) | 4. | \(4\) |
| 1. | \(_{40}^{91}\mathrm{Zr}\) | 2. | \(_{36}^{101}\mathrm{Kr}\) |
| 3. | \(_{36}^{103}\mathrm{Kr}\) | 4. | \(_{56}^{144}\mathrm{Ba}\) |
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The mass number of a nucleus is equal to:
| 1. | the number of neutrons in the nucleus. |
| 2. | the number of protons in the nucleus. |
| 3. | the number of nucleons in the nucleus. |
| 4. | none of them. |
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Choose the correct match:
| Column-I | Column-II | ||
| A. | Moderator | (p) | Cadmium |
| B. | Mass Alchemy | (q) | Americium (Am) |
| C. | Control rod | (r) | Fusion in the sun's core |
| D. | Transuranic element(s) | (s) | D2O |
| 1. | A(s), B(r), C(q), D(p) |
| 2. | A(s), B(p), C(r), D(q) |
| 3. | A(s), B(p), C(q), D(r) |
| 4. | A(s), B(r), C(p), D(q) |
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As the mass number \(A\) increases, which of the following quantities related to a nucleus do not change?
(a) mass
(b) volume
(c) density
(d) binding energy
Choose the correct option from the given ones:
| 1. | (a), (b) only | 2. | (b), (c) only |
| 3. | (c) only | 4. | (a), (d) only |
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| 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. |
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| 1. | atoms get ionized at high temperature |
| 2. | kinetic energy is high enough to overcome the Coulomb repulsion between nuclei |
| 3. | molecules break up at high temperature |
| 4. | nuclei break up at high temperature |
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Q. No.
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