# 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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In an exoergic nuclear reaction (i.e. energy is released in the reaction), let
$$E_1:$$ total binding energy of initial nuclei
$$E_2:$$ total binding energy of final nuclei
$$A_1:$$ total number of nucleons of initial nuclei
$$A_2:$$ total number of nucleons of final nuclei
Then:
1.  $$E_1>E_2$$
2.  $$E_2>E_1$$
3.  $$E_1=E_2$$
4.  $$\frac{E_1}{A_1}=\frac{E_2}{A_2}$$
Subtopic: Â Nuclear Binding Energy |
From NCERT
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In the given nuclear reaction, the element $$\mathrm{X}$$ is:$${ }_{11}^{22} \mathrm{Na} \rightarrow \mathrm{X}+\mathrm{e}^{+}+\nu$$
 1 $${ }_{12}^{22} \mathrm{Mg}$$ 2 $${ }_{11}^{23} \mathrm{Na}$$ 3 $${ }_{10}^{23} \mathrm{Ne}$$ 4 $$_{10}^{22}\textrm{Ne}$$
Subtopic: Â Types of Decay |
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NEET - 2022
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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%
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NEET - 2022
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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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Which, of the following particles, is unstable?
1. proton
2. neutron
3. electron
4. antineutrino
Subtopic: Â Nucleus |
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Antineutrinos are emitted during:
1. $$\alpha$$-decay
2. $$\beta$$-decay
3. $$\gamma$$-decay
4. neutron emission
Subtopic: Â Types of Decay |
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How does the binding energy per nucleon vary with the increase in the number of nucleons?
 1 decrease continuously with mass number. 2 first decreases and then increases with an increase in mass number. 3 first increases and then decreases with an increase in mass number. 4 increases continuously with mass number.
Subtopic: Â Nuclear Binding Energy |
Â 80%
From NCERT
NEET - 2013
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Atomic number increases in:
 1 $$\alpha\text-$$decay. 2 $$\beta^{-}\text-$$decay. 3 $$\beta^{+}\text{-}$$decay. 4 $$K\text{-}$$electron capture.
Subtopic: Â Types of Decay |
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For nuclei with $$A>100,$$

 a. the binding energy of the nucleus decreases on an average as $$A$$ increases. b. the binding energy per nucleon decreases on an average as $$A$$ increases. c. if the nucleus breaks into two roughly equal parts, energy is released. d. if two nuclei fuse to form a bigger nucleus, energy is released.

Choose the correct option
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (a), (d)

Subtopic: Â Nuclear Binding Energy |
Â 68%
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