In nuclear fission, the percentage of mass converted into energy is about

1.  1%

2.  0.1%

3.  0.01%

4.  10%

Subtopic:  Mass-Energy Equivalent |
 56%
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The mass number of helium is 4 and that for suphur is 32. The radius of sulphur nuclei is larger than that of helium by

1.  8

2.  4

3.  2

4.  8

Subtopic:  Mass-Energy Equivalent |
 78%
From NCERT
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In the nuclear decay given below

XzA  YZ + 1A  B*Z - 1A - 4  BZ - 1A - 4,

The particles emitted in the sequence are 

1.  β, α, γ  

2.  γ, β, α  

3.  β, γ, α  

4.  α, β, γ

Subtopic:  Types of Decay |
 88%
From NCERT
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In the nucleus of N1123a, the number of protons, neutrons and electrons are:

1.  11, 12, 0

2.  23, 12, 11

3.  12, 11, 0

4.  23, 11, 12

Subtopic:  Mass-Energy Equivalent |
 81%
From NCERT
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A thorium nucleus is formed when a uranium nucleus emits an α - particle. The atomic number of thorium is

1.  92

2.  90

3.  82

4.  94

Subtopic:  Types of Decay |
 79%
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The activity of the radioactive element decreases to one-third of the original activity A0 in a period of 7 years. After a further lapse of 7 years, its activity will be:

1.  A0  

2.  23A0  

3.  A06  

4.  A09

Subtopic:  Radioactivity (OLD NCERT) |
 62%
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The radius of Germanium (Ge) nuclide is measured to be twice the radius of Be49. The number of nucleons in Ge is:

1. 73

2. 74

3. 75

4. 72

Subtopic:  Mass-Energy Equivalent |
 75%
From NCERT
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In the reaction

H12 + H13  He24 + n01
if the binding energies of H12, H13, and He24 are respectively a, b, and c (in MeV), then the energy in (MeV) released in this reaction is:

1.  c + a - b

2.  c - a - b

3.  a + b + c

4.  a + b - c

Subtopic:  Nuclear Binding Energy |
 74%
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A radioactive nucleus X decays to a stable nucleus 'y'. The graph of the rate of formation of 'y' against time 't' will be:

1. 2.
3. 4.
Subtopic:  Radioactivity (OLD NCERT) |
 60%
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A stationary radioactivity nucleus of mass 210 units disintegrates into an alpha particle of mass 4 units and residual nucleus of mass 206 units. If the kinetic energy of the alpha particles is E, the kinetic energy of the residual nucleus is 

1.  2105 E 

2.  2103 E 

3.  103105 E 

4.  1032 E

Subtopic:  Radioactivity (OLD NCERT) |
 68%
From NCERT
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