- 1(current)
Q. No.The mass of a neutral carbon atom in the ground state:
| 1. | is exact \(12\) u |
| 2. | is less than \(12\) u |
| 3. | is more than \(12\) u |
| 4. | depends on the form of carbon such as graphite or charcoal |
Subtopic: Â Nuclear Energy |
 57%
Level 3: 35%-60%
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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. |
Subtopic: Â Nuclear Energy |
 85%
Level 1: 80%+
Hints
Which of the following need not be necessarily obeyed in a nuclear reaction?
| 1. | The conservation of charge |
| 2. | The conservation of mass |
| 3. | The conservation of mass energy |
| 4. | The conservation of momentum |
Subtopic: Â Nuclear Energy |
 52%
Level 3: 35%-60%
Please attempt this question first.
Hints
Please attempt this question first.
For the fission reaction
\({ }_0^1 \mathrm{n}+{ }_{92}^{235} \mathrm{U} \rightarrow{ }_{92}^{236} \mathrm{U} \rightarrow{ }_{56}^{144} \mathrm{Ba}+{ }_{36}^{89} \mathrm{Kr}+\mathrm { neutrons }\)
the number of neutrons produced is:
1. \(1\)
2. \(2\)
3. \(3\)
4. \(4\)
\({ }_0^1 \mathrm{n}+{ }_{92}^{235} \mathrm{U} \rightarrow{ }_{92}^{236} \mathrm{U} \rightarrow{ }_{56}^{144} \mathrm{Ba}+{ }_{36}^{89} \mathrm{Kr}+\mathrm { neutrons }\)
the number of neutrons produced is:
1. \(1\)
2. \(2\)
3. \(3\)
4. \(4\)
Subtopic: Â Nuclear Energy |
 86%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
When a uranium isotope \(_{92}^{235}\mathrm{U}\) is bombarded with a neutron, it generates \(_{36}^{89}\mathrm{Kr}\), three neutrons and:
| 1. | \(_{40}^{91}\mathrm{Zr}\) | 2. | \(_{36}^{101}\mathrm{Kr}\) |
| 3. | \(_{36}^{103}\mathrm{Kr}\) | 4. | \(_{56}^{144}\mathrm{Ba}\) |
Subtopic: Â Nuclear Energy |
 85%
Level 1: 80%+
NEET - 2020
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Links
Fusion processes, like combining two deuterons to form a \({He}\)-nucleus are impossible at ordinary temperatures and pressure. The reasons for this can be traced to the fact:
Choose the correct option:
| (a) | nuclear forces have short-range. |
| (b) | nuclei are positively charged. |
| (c) | the original nuclei must be completely ionized before fusion can take place. |
| (d) | the original nuclei must first break up before combining with each other. |
Choose the correct option:
| 1. | (a) and (c) | 2. | (a) and (d) |
| 3. | (b) and (d) | 4. | (a) and (b) |
Subtopic: Â Nuclear Energy |
Level 3: 35%-60%
Hints
How long can an electric lamp of \(100\) W be kept glowing by fusion of \(2.0\) kg of deuterium? Take the fusion reaction as:
\({}_{1}^{2}\mathrm{H}+{}_{1}^{2}\mathrm{H}\rightarrow {}_{2}^{3}\mathrm{He}+ n + 3.27~\text{MeV}\)
\({}_{1}^{2}\mathrm{H}+{}_{1}^{2}\mathrm{H}\rightarrow {}_{2}^{3}\mathrm{He}+ n + 3.27~\text{MeV}\)
| 1. | \(4.9 \times 10^{4} \text{ years }\) | 2. | \(2.8 \times 10^{4} \text { years }\) |
| 3. | \(3.0 \times 10^{4} \text { years }\) | 4. | \(3.9 \times 10^{4} \text { years }\) |
Subtopic: Â Nuclear Energy |
Level 3: 35%-60%
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Links
- 1(current)
Q. No.
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