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) |
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The mass number of a nucleus is

1.  sometimes equal to its atomic number

2.  sometimes less than and sometimes more than its atomic number

3.  always less than its atomic number

4.  always more than its atomic number

Subtopic:  Mass-Energy Equivalent |
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Two nucleons are at a separation of 1 fm. The net force between them is F1 if both are neutrons, F2 if both are protons and F3 if one is
proton and other is a neutron. Hence 

1.  F1 > F2 > F3   

2.  F2 > F1 > F3     

3.  F1 = F3 > F2     

4.  F1 = F2 > F3  

Subtopic:  Nuclear Binding Energy |
 53%
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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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In the reaction \({}_{1}^{2}\mathrm{H}+ {}_{1}^{3}\mathrm{H}\rightarrow {}_{2}^{4}\mathrm{He}+ {}_{0}^{1}\mathrm{n}\)
if the binding energies of \({}_{1}^{2}\mathrm{H}, {}_{1}^{3}\mathrm{H},\) and \({}_{2}^{4}\mathrm{He}\) 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 |
 73%
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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 |
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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) |
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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 |
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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 |
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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 |
 87%
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