For the nuclear reaction:
\({}_{92}^{235}\mathrm{U}+ {}_{0}^{1}\mathrm{n}\rightarrow {}_{56}^{144}\mathrm{Ba}+...+3{}_{0}^{1}\mathrm{n}\)
The blank space can be filled by:
1. \({}_{26}^{89}\mathrm{Kr}\)
2. \({}_{36}^{89}\mathrm{Kr}\)
3. \({}_{26}^{90}\mathrm{Sr}\)
4. \({}_{38}^{89}\mathrm{Sr}\)

Subtopic:  Nuclear Energy |
 87%
From NCERT
AIPMT - 1998
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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.
Subtopic:  Nuclear Energy |
 81%
From NCERT
NEET - 2011
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Which of the following is used as a moderator in nuclear reactors? 

1. Plutonium 

2. Cadmium 

3. Heavy water

4. Uranium 

Subtopic:  Nuclear Energy |
 80%
From NCERT
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Which of the following are suitable for the fusion process?

1. light nuclei
2. heavy nuclei
3. the element must be lying in the middle of the periodic table
4. middle elements which are lying on the binding energy curve
Subtopic:  Nuclear Energy |
 79%
From NCERT
AIPMT - 2002
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If in nuclear reactor using \(\mathrm{U}^{235}\) as fuel, the power output is \(4.8\) MW, the number of fissions per second is:
(Energy released per fission of \(\mathrm{U}^{235}=200\) MeV watts, \(1~\text{eV}= 1.6\times 10^{-19}~\text{J})\)
1. \(1.5\times 10^{17}\)
2. \(3\times 10^{19}\)
3. \(1.5\times 10^{25}\)

4. \(3\times 10^{25}\)

Subtopic:  Nuclear Energy |
 71%
From NCERT
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Solar energy is due to:

1. fusion reaction.

2. fission reaction.

3. combustion reaction.

4. chemical reaction.

Subtopic:  Nuclear Energy |
 66%
From NCERT
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The statement which is incorrect about nuclear force between two protons is?

1. These are always attractive forces.
2. These are non-central forces.
3. These are charge independent.
4. These are short-range forces.

Subtopic:  Nuclear Energy |
 59%
From NCERT
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The power obtained in a reactor using \(\mathrm{U}^{235}\) disintegration is \(1000\) kW. The mass decay of \(\mathrm{U}^{235}\) per hour is:
1. \(1\) microgram
2. \(10\) microgram
3. \(20\) microgram
4. \(40\) microgram

Subtopic:  Nuclear Energy |
From NCERT
PMT - 2011
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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. \(4.9 \times 10^{4} \text{ years }\) 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:  Nuclear Energy |
From NCERT
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If the nuclear force between two protons, two neutrons and between a proton and a neutron is denoted by \(F_{pp} ,F_{nn}\) and \(F_{pn}\) respectively, then:
1. \(F_{p p} \approx F_{n n} \approx F_{p n}\)
2. \(F_{p p} \neq F_{n n}\) and \(F_{p n} = F_{n n}\)
3. \(F_{p p} = F_{n n} = F_{p n}\)
4. \(F_{p p} \neq F_{n n} \neq F_{p n}\)
Subtopic:  Nuclear Energy |
From NCERT
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