# What happens to the mass number and the atomic number of an element when it emits $$\gamma\text{-}$$radiation? 1. mass number decreases by four and atomic number decreases by two. 2. mass number and atomic number remain unchanged. 3. mass number remains unchanged while the atomic number decreases by one. 4. mass number increases by four and the atomic number increases by two.

Subtopic:  Types of Decay |
83%
From NCERT
NEET - 2020
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The binding energy per nucleon in deuterium and helium nuclei are $$1.1$$ MeV and $$7.0$$ MeV, respectively. When two deuterium nuclei fuse to form a helium nucleus the energy released in the fusion is:
1. $$2.2$$ MeV
2. $$28.0$$ MeV
3. $$30.2$$ MeV
4. $$23.6$$ MeV

Subtopic:  Nuclear Binding Energy |
82%
From NCERT
AIPMT - 2010
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Boron has two isotopes ${}_{5}B^{10}$ and ${}_{5}B^{11}$. If atomic weight of Boron is 10.81 then ratio of ${}_{5}B^{10}$ to ${}_{5}B^{11}$in nature will be:

1. 15 : 16

2. 19: 81

3. 81 : 19

4. 20: 53

Subtopic:  Mass-Energy Equivalent |
67%
From NCERT
AIPMT - 1998
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For the given reaction, the particle $$\mathrm{X}$$ is:
$${ }_6^{11} \mathrm{C}\rightarrow { }_5^{11}\mathrm{B}+\beta^{+}+\mathrm{X}$$
1. neutron
2. anti-neutrino
3. neutrino
4. proton

Subtopic:  Types of Decay |
65%
From NCERT
AIPMT - 2000
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In the reaction $${ }_1^2 \mathrm{H}+{ }_1^3 \mathrm{H} \longrightarrow{ }_2^4 \mathrm{He}+{ }_0^1 n$$ , if the binding energies of $${ }_1^2 \mathrm{H},~_1^3 \mathrm{H} ~\text{and}~_2^4\mathrm{H}$$ He are respectively $$a,b$$ and $$c$$ (in MeV,) then the energy (in MeV) released in this reaction is:
1. $$a+b+c$$
2. $$c+a-b$$
3. $$c-a-b$$
4. $$a+b-c$$
Subtopic:  Nuclear Binding Energy |
75%
From NCERT
AIPMT - 2005
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In any fission process the ratio

1. Greater than 1

2. Depends on the mass of the parent nucleus

3. Equal to 1

4. Less than 1

Subtopic:  Nuclear Energy |
58%
From NCERT
AIPMT - 2005
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Fission of nuclei is possible because the binding energy per nucleon in them:

 1 decreases with the mass number at low mass numbers 2 increases with the mass number at low mass numbers 3 decreases with the mass number at high mass numbers 4 increases with the mass number at high mass numbers
Subtopic:  Nuclear Energy |
57%
From NCERT
AIPMT - 2005
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Nuclear – fission is best explained by:

1. Liquid droplet theory

2. Yukawa $\pi$ - meson theory

3. Independent particle model of the nucleus

4. Proton-proton cycle

Subtopic:  Nuclear Energy |
From NCERT
AIPMT - 2000
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For the nuclear reaction:
$${}_{92}^{235}\mathrm{U}+ {}_{0}^{1}\mathrm{n}\rightarrow {}_{56}^{144}\mathrm{Ba}+...+3{}_{0}^{1}\mathrm{n}$$
The blank space can be filled by:
1. $${}_{26}^{89}\mathrm{Kr}$$
2. $${}_{36}^{89}\mathrm{Kr}$$
3. $${}_{26}^{90}\mathrm{Sr}$$
4. $${}_{38}^{89}\mathrm{Sr}$$

Subtopic:  Nuclear Energy |
87%
From NCERT
AIPMT - 1998
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${}_{n}X_{m}$ emitted one  particles, then it will become:

1. ${}_{n}X_{m-4}$

2. ${}_{n-1}X_{m-1}$

3. ${}_{n}Z_{m-4}$

4. None of these

Subtopic:  Types of Decay |
68%
From NCERT
AIPMT - 1998
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