In one \(\alpha-\) and \(2\beta-\)emissions:

1. mass number reduced by \(2\)
2. mass number reduces by \(6\)
3. atomic number is reduced by \(2\)
4. atomic number remains unchanged

Subtopic:  Types of Decay |
 79%
From NCERT
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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 |
 81%
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 |
 68%
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,

\(^{236}_{92}U\rightarrow ~^{117}X~+~^{117}Y~+~^1_0n~+~^1_0n,\) the binding energy per nucleon of X and Y is 8.5 MeV whereas that of \(^{236}U\) 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 |
 76%
From NCERT
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A nuclear decay is expressed as 

C116B115+β++X

Then the unknown particle X is:

1. Neutron 

2. antineutrino

3. proton 

4. neutrino

Subtopic:  Types of Decay |
 60%
From NCERT
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When a deuterium is bombarded on O168 nucleus, an α-particle is emitted, then the product nucleus is:

1. N137 

2. B105

3. B4e9 

4. N147

Subtopic:  Types of Decay |
 76%
From NCERT
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A nuclear reaction given by \({ }_{Z}^{A} \mathrm{~X} \rightarrow{ }_{Z+1}^{A} \mathrm{Y}+e^{-}+\bar{v}\) represents:
1. fusion
2. fission
3. \(\beta^{-} \)-decay
4. \(\gamma \)-decay

Subtopic:  Types of Decay |
 87%
From NCERT
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The mass of N157 is 15.00011 amu, mass of O168 is 15.99492 amu and mp= 1.00783 amu. Determine the binding energy of the last proton of \({ }_8 O_{16}\).

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) |
 54%
From NCERT
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