NEET Test Series from KOTA - 10 Papers In MS WORD
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PHXII13:NUCLEI
363730
Assuming that about \(200\,MeV\) of energy is released per fission of \({}_{92}{{\rm{U}}^{235}}\) nuclei, then the mass of \({{\rm{U}}^{235}}\) consumed per day in a fission reactor of power 1 megawatt will be approximately:
1 \(10,000\,g\)
2 \({10^{ - 2}}\,g\)
3 \(1\,g\)
4 \(100\,g\)
Explanation:
Power \(P\) of fission reaction, \(P = {10^6}{\rm{watt}} = {10^6}{\rm{joule /sec}}\) Time \( = t = 1{\rm{day = }}\,{\rm{24}} \times {\rm{3600}}\sec \) Energy produced , \(U = Pt\) \({\rm{U}} = {10^6} \times 24 \times 3600 = 24 \times 36 \times {10^8}{\rm{joule}}\) Energy released per fission of \({{\rm{U}}^{235}}\) \( = 200MeV = 32 \times {10^{ - 12}}\,J\) Number of \({U^{235}}\) atoms used \( = \frac{{24 \times 36 \times {{10}^8}}}{{32 \times {{10}^{ - 12}}}} = 27 \times {10^{20}}\) Mass of \(6 \times {10^{23}}\) atoms of \({U^{235}} = 235{\rm{g}}\) Mass of \(27 \times {10^{20}}\) atoms of \({U^{235}}\) \( = \left( {\frac{{235}}{{6 \times {{10}^{23}}}}} \right)\left( {27 \times {{10}^{20}}} \right) = 1g\)
PHXII13:NUCLEI
363731
Assertion : There is a chain reaction when uranium is bombarded with slow neutrons. Reason : When uranium is bombarded with slow neutrons more neutrons are produced.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Slow neutron bombardment of \({ }^{235} U\) initiates a chain reaction, yielding products like \(^{141}Ba{,^{92}}Kr\), and additional neutrons. The process generates more neutrons, causing subsequent uranium nuclei to undergo fission, creating a self - sustaining chain reaction. So correct option is (1).
PHXII13:NUCLEI
363732
Assertion : For the fission of heavy nuclei, neutrons are more effective than protons. Reason : Protons are heavier than Neutrons.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\({m_n} = 1\,amu,{m_p} = 0.938\,amu\). A neutron is slightly heavier than a proton. Because neutrons lack an electric charge, they can penetrate matter more effectively than protons.Consequently, they exhibit greater effectiveness than protons in fission reactions. So correct option is (3).
PHXII13:NUCLEI
363733
A chain reaction in fission of Uranium is possible because
1 Large amount of energy is released
2 Two intermediate size nuclear fragments are formed
3 More than one neutron is given out in each fission
363730
Assuming that about \(200\,MeV\) of energy is released per fission of \({}_{92}{{\rm{U}}^{235}}\) nuclei, then the mass of \({{\rm{U}}^{235}}\) consumed per day in a fission reactor of power 1 megawatt will be approximately:
1 \(10,000\,g\)
2 \({10^{ - 2}}\,g\)
3 \(1\,g\)
4 \(100\,g\)
Explanation:
Power \(P\) of fission reaction, \(P = {10^6}{\rm{watt}} = {10^6}{\rm{joule /sec}}\) Time \( = t = 1{\rm{day = }}\,{\rm{24}} \times {\rm{3600}}\sec \) Energy produced , \(U = Pt\) \({\rm{U}} = {10^6} \times 24 \times 3600 = 24 \times 36 \times {10^8}{\rm{joule}}\) Energy released per fission of \({{\rm{U}}^{235}}\) \( = 200MeV = 32 \times {10^{ - 12}}\,J\) Number of \({U^{235}}\) atoms used \( = \frac{{24 \times 36 \times {{10}^8}}}{{32 \times {{10}^{ - 12}}}} = 27 \times {10^{20}}\) Mass of \(6 \times {10^{23}}\) atoms of \({U^{235}} = 235{\rm{g}}\) Mass of \(27 \times {10^{20}}\) atoms of \({U^{235}}\) \( = \left( {\frac{{235}}{{6 \times {{10}^{23}}}}} \right)\left( {27 \times {{10}^{20}}} \right) = 1g\)
PHXII13:NUCLEI
363731
Assertion : There is a chain reaction when uranium is bombarded with slow neutrons. Reason : When uranium is bombarded with slow neutrons more neutrons are produced.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Slow neutron bombardment of \({ }^{235} U\) initiates a chain reaction, yielding products like \(^{141}Ba{,^{92}}Kr\), and additional neutrons. The process generates more neutrons, causing subsequent uranium nuclei to undergo fission, creating a self - sustaining chain reaction. So correct option is (1).
PHXII13:NUCLEI
363732
Assertion : For the fission of heavy nuclei, neutrons are more effective than protons. Reason : Protons are heavier than Neutrons.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\({m_n} = 1\,amu,{m_p} = 0.938\,amu\). A neutron is slightly heavier than a proton. Because neutrons lack an electric charge, they can penetrate matter more effectively than protons.Consequently, they exhibit greater effectiveness than protons in fission reactions. So correct option is (3).
PHXII13:NUCLEI
363733
A chain reaction in fission of Uranium is possible because
1 Large amount of energy is released
2 Two intermediate size nuclear fragments are formed
3 More than one neutron is given out in each fission
363730
Assuming that about \(200\,MeV\) of energy is released per fission of \({}_{92}{{\rm{U}}^{235}}\) nuclei, then the mass of \({{\rm{U}}^{235}}\) consumed per day in a fission reactor of power 1 megawatt will be approximately:
1 \(10,000\,g\)
2 \({10^{ - 2}}\,g\)
3 \(1\,g\)
4 \(100\,g\)
Explanation:
Power \(P\) of fission reaction, \(P = {10^6}{\rm{watt}} = {10^6}{\rm{joule /sec}}\) Time \( = t = 1{\rm{day = }}\,{\rm{24}} \times {\rm{3600}}\sec \) Energy produced , \(U = Pt\) \({\rm{U}} = {10^6} \times 24 \times 3600 = 24 \times 36 \times {10^8}{\rm{joule}}\) Energy released per fission of \({{\rm{U}}^{235}}\) \( = 200MeV = 32 \times {10^{ - 12}}\,J\) Number of \({U^{235}}\) atoms used \( = \frac{{24 \times 36 \times {{10}^8}}}{{32 \times {{10}^{ - 12}}}} = 27 \times {10^{20}}\) Mass of \(6 \times {10^{23}}\) atoms of \({U^{235}} = 235{\rm{g}}\) Mass of \(27 \times {10^{20}}\) atoms of \({U^{235}}\) \( = \left( {\frac{{235}}{{6 \times {{10}^{23}}}}} \right)\left( {27 \times {{10}^{20}}} \right) = 1g\)
PHXII13:NUCLEI
363731
Assertion : There is a chain reaction when uranium is bombarded with slow neutrons. Reason : When uranium is bombarded with slow neutrons more neutrons are produced.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Slow neutron bombardment of \({ }^{235} U\) initiates a chain reaction, yielding products like \(^{141}Ba{,^{92}}Kr\), and additional neutrons. The process generates more neutrons, causing subsequent uranium nuclei to undergo fission, creating a self - sustaining chain reaction. So correct option is (1).
PHXII13:NUCLEI
363732
Assertion : For the fission of heavy nuclei, neutrons are more effective than protons. Reason : Protons are heavier than Neutrons.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\({m_n} = 1\,amu,{m_p} = 0.938\,amu\). A neutron is slightly heavier than a proton. Because neutrons lack an electric charge, they can penetrate matter more effectively than protons.Consequently, they exhibit greater effectiveness than protons in fission reactions. So correct option is (3).
PHXII13:NUCLEI
363733
A chain reaction in fission of Uranium is possible because
1 Large amount of energy is released
2 Two intermediate size nuclear fragments are formed
3 More than one neutron is given out in each fission
363730
Assuming that about \(200\,MeV\) of energy is released per fission of \({}_{92}{{\rm{U}}^{235}}\) nuclei, then the mass of \({{\rm{U}}^{235}}\) consumed per day in a fission reactor of power 1 megawatt will be approximately:
1 \(10,000\,g\)
2 \({10^{ - 2}}\,g\)
3 \(1\,g\)
4 \(100\,g\)
Explanation:
Power \(P\) of fission reaction, \(P = {10^6}{\rm{watt}} = {10^6}{\rm{joule /sec}}\) Time \( = t = 1{\rm{day = }}\,{\rm{24}} \times {\rm{3600}}\sec \) Energy produced , \(U = Pt\) \({\rm{U}} = {10^6} \times 24 \times 3600 = 24 \times 36 \times {10^8}{\rm{joule}}\) Energy released per fission of \({{\rm{U}}^{235}}\) \( = 200MeV = 32 \times {10^{ - 12}}\,J\) Number of \({U^{235}}\) atoms used \( = \frac{{24 \times 36 \times {{10}^8}}}{{32 \times {{10}^{ - 12}}}} = 27 \times {10^{20}}\) Mass of \(6 \times {10^{23}}\) atoms of \({U^{235}} = 235{\rm{g}}\) Mass of \(27 \times {10^{20}}\) atoms of \({U^{235}}\) \( = \left( {\frac{{235}}{{6 \times {{10}^{23}}}}} \right)\left( {27 \times {{10}^{20}}} \right) = 1g\)
PHXII13:NUCLEI
363731
Assertion : There is a chain reaction when uranium is bombarded with slow neutrons. Reason : When uranium is bombarded with slow neutrons more neutrons are produced.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Slow neutron bombardment of \({ }^{235} U\) initiates a chain reaction, yielding products like \(^{141}Ba{,^{92}}Kr\), and additional neutrons. The process generates more neutrons, causing subsequent uranium nuclei to undergo fission, creating a self - sustaining chain reaction. So correct option is (1).
PHXII13:NUCLEI
363732
Assertion : For the fission of heavy nuclei, neutrons are more effective than protons. Reason : Protons are heavier than Neutrons.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\({m_n} = 1\,amu,{m_p} = 0.938\,amu\). A neutron is slightly heavier than a proton. Because neutrons lack an electric charge, they can penetrate matter more effectively than protons.Consequently, they exhibit greater effectiveness than protons in fission reactions. So correct option is (3).
PHXII13:NUCLEI
363733
A chain reaction in fission of Uranium is possible because
1 Large amount of energy is released
2 Two intermediate size nuclear fragments are formed
3 More than one neutron is given out in each fission
