Processing math: 100%

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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Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is 

1. to control energy released in the reactor

2. to absorb neutrons and stop the chain reaction

3. to cool the reactor

4. to slow down the neutrons to thermal energies

Subtopic:  Nuclear Energy |
 67%
From NCERT
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The binding energy per nucleon of deuterium and helium atom is 1.1 MeV and 7.0 MeV. If two deuterium nuclei fuse to form a helium atom, the energy released is:
1. 19.2 MeV
2. 23.6 MeV
3. 26.9 MeV 
4. 13.9 MeV
Subtopic:  Nuclear Binding Energy |
 76%
From NCERT
PMT - 2001
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In a fission reaction,
23692U 117X + 117Y + 10n + 10n, the binding energy per nucleon of X and Y is 8.5 MeV whereas that of 236U is 7.6 MeV. The total energy liberated will be about:
1. 2000 MeV
2. 200 MeV
3. 2 MeV 
4. 1 keV

Subtopic:  Nuclear Binding Energy |
 78%
From NCERT
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A nuclear decay is expressed as:
116C115B+β++X
Then the unknown particle X is:
1. neutron 
2. antineutrino
3. proton 
4. neutrino

Subtopic:  Types of Decay |
 59%
From NCERT
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When a deuterium is bombarded on 168O nucleus, an α-particle is emitted, then the product nucleus is:
1. 137N 2. 105B
3. 94Be 4. 147N
Subtopic:  Types of Decay |
 77%
From NCERT
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A nuclear reaction given by AZ XAZ+1Y+e+ˉv represents:

1. fusion 2. fission
3. β-decay 4. γ-decay
Subtopic:  Types of Decay |
 88%
From NCERT
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The mass of 157N is 15.00011 amu, mass of 168O is 15.99492 amu and mp=1.00783 amu. Determine the binding energy of the last proton of 168O.
1. 2.13 MeV
2. 0.13 MeV 
3. 10 MeV 
4. 12.13 MeV

Subtopic:  Nuclear Binding Energy |
 52%
From NCERT
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The rate of disintegration of a fixed quantity of a radioactive substance can be increased by:

1. increasing the temperature.

2. increasing the pressure.

3. chemical reaction.

4. it is not possible.

Subtopic:  Radioactivity (OLD NCERT) |
 53%
From NCERT
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The energy released by the fission of one  uranium atom is 200 MeV. The number of fission per second required to produce 3.2 W of power is (Take, 1 eV = 1.6×10-19 J

1. 107 

2. 1010 

3. 1015

4. 1011

Subtopic:  Nuclear Binding Energy |
 70%
From NCERT
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