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Boron has two isotopes B105 and B115. If atomic weight of Boron is 10.81 then ratio of B105 to B115in nature will be: 

1. 15 : 16 

2. 19: 81

3. 81 : 19 

4. 20: 53

Subtopic:  Mass-Energy Equivalent |
 68%
From NCERT
AIPMT - 1998
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For the nuclear reaction:
23592U+10n14456Ba+...+310n
The blank space can be filled by:
1. 8926Kr 2. 8936Kr
3. 9026Sr 4. 8938Sr
Subtopic:  Nuclear Energy |
 88%
From NCERT
AIPMT - 1998
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Xmn emitted one αandβ particles, then it will become: 

1. Xm-4n

2. Xm-1n-1

3. Zm-4n

4. None of these

Subtopic:  Types of Decay |
 70%
From NCERT
AIPMT - 1998
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When X147N+2β then the number of neutrons in X will be:
1. 3
2. 5
3. 7
4. 9

Subtopic:  Types of Decay |
 60%
From NCERT
AIPMT - 1998
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If a radioactive element emitted one α and one β-particle, then the mass number of the daughter element is:
1. decreased by 4
2. increased by 4
3. decreased by 2
4. increased by 2

Subtopic:  Types of Decay |
 87%
From NCERT
AIPMT - 1999
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For the given reaction, the particle X is:
116C115B+β++X
1. neutron
2. anti-neutrino
3. neutrino
4. proton

Subtopic:  Types of Decay |
 66%
From NCERT
AIPMT - 2000
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Nuclear–fission is best explained by:
1. Liquid droplet theory.
2. Yukawa π-meson theory.
3. Independent particle model of the nucleus.
4. Proton-proton cycle.
Subtopic:  Nuclear Energy |
From NCERT
AIPMT - 2000
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Which rays contain (+ve) charged particle:
1.  α-rays
2.  β-rays
3.  γ-rays
4.  X-rays

Subtopic:  Types of Decay |
 73%
From NCERT
AIPMT - 2001
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If X(n, α ) converts into  L73i, then X will be: 

1. B105

2.  B95

3. B114e

4. H42e

Subtopic:  Types of Decay |
 59%
From NCERT
AIPMT - 2001
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Mn and Mp represent the mass of the neutron and proton respectively. An element having mass M has N neutrons and Z-protons, then the correct relation will be:
1. M<{N.Mn+Z.Mp}
2. M>{N.Mn+Z.Mp}
3. M={N.Mn+Z.Mp}
4. M=N{Mn+Mp}

Subtopic:  Nuclear Binding Energy |
 82%
From NCERT
AIPMT - 2001
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