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 |
 66%
From NCERT
AIPMT - 1998
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For the nuclear reaction:

U23592 + n10  B56a144  + ...  + 30n1

The blank space can be filled by:

1. K26r89

2.  K36r89

3. S26r90

4.  S38r89

Subtopic:  Nuclear Energy |
 87%
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 |
 67%
From NCERT
AIPMT - 1998
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When X → \(N_{7}^{14}\)  + 2\(\beta^{-} \) then the number of neutrons in X will be:
1. 3
2. 5
3. 7
4. 9

Subtopic:  Types of Decay |
 57%
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 |
 85%
From NCERT
AIPMT - 1999
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For the given reaction, the particle \(X\) is:
\({ }_6^{11} \mathrm{C}\rightarrow { }_5^{11}\mathrm{B}+\beta^{+}+X\)
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 |
 69%
From NCERT
AIPMT - 2001
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If X(n, α ) converts into  L37i, then X will be: 

1. B510

2.  B59

3. B411e

4. H24e

Subtopic:  Types of Decay |
 57%
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 |
 79%
From NCERT
AIPMT - 2001
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