A nucleus represented by the symbol $${}_{Z}^{A}\mathrm{X}$$ has:
 1 $$Z$$ protons and $$A-Z$$ neutrons 2 $$Z$$ protons and $$A$$ neutrons 3 $$A$$ protons and $$Z-A$$ neutrons 4 $$Z$$ neutrons and $$A-Z$$ protons
Subtopic: Â Nuclear Binding Energy |
Â 90%
From NCERT
AIPMT - 2004
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As compared to 12C atom, 14C atom has:

 1 two extra protons and two extra electrons 2 two extra protons but no extra electron 3 two extra neutrons and no extra electron 4 two extra neutrons and two extra electrons

Subtopic: Â Nuclear Energy |
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The volume occupied by an atom is greater than the volume of the nucleus by a factor of about:
1. $$10$$
2. $$10^5$$
3. $$10^{10}$$
4. $$10^{15}$$

Subtopic: Â Mass-Energy Equivalent |
Â 60%
From NCERT
AIPMT - 2003
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The radius of a nucleus $$(r)$$ is directly proportional to the cube-root of the number of nucleons $$(N).$$ Assume that the mass of a nucleon is fixed $$(m_n).$$ The density $$(\rho)$$ of a nucleus varies as:
1. $$N^3$$
2. $$N^1$$
3. $$N^0$$
4. $$N^{-1}$$
Subtopic: Â Nucleus |
Â 81%
From NCERT
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Two nuclei have their mass numbers in the ratio of $$1:3.$$ The ratio of their nuclear densities would be:
1. $$1:3$$
2. $$3:1$$
3. $$(3)^{1/3}:1$$
4. $$1:1$$

Subtopic: Â Nucleus |
Â 78%
From NCERT
AIPMT - 2008
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A nucleus of mass number $$189$$ splits into two nuclei having mass numbers $$125$$ and $$64.$$ The ratio of the radius of two daughter nuclei respectively is:
 1 $$25:16$$ 2 $$1:1$$ 3 $$4:5$$ 4 $$5:4$$
Subtopic: Â Nucleus |
Â 81%
From NCERT
NEET - 2022
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Given below are two statements:
 Assertion (A): The density of nucleus is much higher than that of ordinary matter. Reason (R): Most of the mass of the atom is concentrated in the nucleus while the size of this nucleus is almost $$10^5$$ times smaller.
 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 Both (A) and (R) are False.
Subtopic: Â Nucleus |
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Which, of the following particles, is unstable?
1. proton
2. neutron
3. electron
4. antineutrino
Subtopic: Â Nucleus |
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A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in the fusion reaction is $$0.02866~\text{u}$$. The energy liberated per nucleon is: (given $$1~\mathrm{u} = 931~\text{MeV}$$ )
1. $$26.7~\text{MeV}$$
2. $$6.675~\text{MeV}$$
3. $$13.35~\text{MeV}$$
4. $$2.67~\text{MeV}$$
Subtopic: Â Mass-Energy Equivalent |
From NCERT
AIPMT - 2013
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If $$M(A,~Z)$$$$M_p$$${}_{}$, and $$M_n$$ denote the masses of the nucleus $$^{A}_{Z}X,$$ proton, and neutron respectively in units of $$u$$ $$(1~u=931.5~\text{MeV/c}^2)$$ and represent its binding energy $$(BE)$$ in $$\text{MeV}$$. Then:

 1 $$M(A, Z) = ZM_p + (A-Z)M_n- \dfrac{BE}{c^2}$$ 2 $$M(A, Z) = ZM_p + (A-Z)M_n+ BE$$ 3 $$M(A, Z) = ZM_p + (A-Z)M_n- BE$$ 4 $$M(A, Z) = ZM_p + (A-Z)M_n+ \dfrac{BE}{c^2}$$
Subtopic: Â Mass-Energy Equivalent |
Â 71%
From NCERT
AIPMT - 2008
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