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Q. No.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: Nuclear Energy |
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Let \(F_{pp}, F_{pn}~\text{and}~F_{nn}\) denote the magnitudes of the net force by a proton on a proton, by a proton on a neutron and by a neutron on a neutron respectively. Neglect gravitational force. When the separation is \(1~\text{fm}\),
| 1. | \(F_{pp}> F_{pn}=F_{nn}\) |
| 2. | \(F_{pp}= F_{pn}=F_{nn}\) |
| 3. | \(F_{pp}> F_{pn}>F_{nn}\) |
| 4. | \(F_{pp}< F_{pn}=F_{nn}\) |
Subtopic: Nuclear Binding Energy |
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Two protons are kept at a separation of \(10\) nm. Let \(F_n\) and \(F_e\) be the nuclear force and the electromagnetic force between them.
| 1. | \(F_e=F_n\) |
| 2. | \(F_e>>F_n\) |
| 3. | \(F_e<<F_n\) |
| 4. | \(F_e\) and \(F_n\) differ only slightly |
Subtopic: Nuclear Binding Energy |
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Which of the following is a wrong description of binding energy of a nucleus?
| 1. | it is the energy required to break a nucleus into its constituent nucleons. |
| 2. | it is the energy made available when free nucleons combine to form a nucleus. |
| 3. | it is the sum of the rest mass energies of its nucleons minus the rest mass energy of the nucleus. |
| 4. | it is the sum of the kinetic energy of all the nucleons in the nucleus. |
Subtopic: Nuclear Binding Energy |
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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: Nuclear Binding Energy |
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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: Types of Decay |
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Antineutrinos are emitted during:
1. \(\alpha\)-decay
2. \(\beta\)-decay
3. \(\gamma\)-decay
4. neutron emission
1. \(\alpha\)-decay
2. \(\beta\)-decay
3. \(\gamma\)-decay
4. neutron emission
Subtopic: Types of Decay |
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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: 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. \(\frac{E_1}{A_1}=\frac{E_2}{A_2}\)
\(E_1:\) 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: Nuclear Binding Energy |
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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. \(_{10}^{22}\textrm{Ne}\)
\({ }_{11}^{22} \mathrm{Na} \rightarrow \mathrm{X}+\mathrm{e}^{+}+\nu\)
1. \({ }_{12}^{22} \mathrm{Mg}\)
2. \({ }_{11}^{23} \mathrm{Na}\)
3. \({ }_{10}^{23} \mathrm{Ne}\)
4. \(_{10}^{22}\textrm{Ne}\)
Subtopic: Types of Decay |
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