NEET Test Series from KOTA - 10 Papers In MS WORD
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PHXII13:NUCLEI
363804
Assertion : Nuclear force has limited range, unlike electric and gravitational forces. Reason : Nuclear force obeys inverse square law.
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:
Electrostatic and gravitational forces obey inverse square law and are of long range and are central forces (r-dependent). But nuclear forces do not follow \(\left(\dfrac{1}{r^{2}}\right)\) law. They 'glue' neutrons and protons together. So correct option is (3).
PHXII13:NUCLEI
363805
Assertion : Two protons can attract each other. Reason : The distance between the protons within the nucleus is about \({10^{ - 15}}\;m\).
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:
Protons experience repulsion due to electrostatic forces. At short distances, strong nuclear forces dominate. Net force on close protons turns attractive. So correct option is \((1)\).
PHXII13:NUCLEI
363806
Two protons are kept at a separation of \(40\mathop A\limits^ \circ \). \({F_n}\) is the nuclear force and\({F_e}\) is the electrostatic force between them. Then
1 \({F_n} < < {F_e}\)
2 \(F_{n} \approx F_{e}\)
3 \({F_n} > > {F_c}\)
4 \(F_{n}=F_{e}\)
Explanation:
Nuclear force is much stronger than the electrostatic force inside the nucleus \(i.e.,\) at distances of the order of fermi. At 40 \(\mathop {{\rm{ }}A}\limits^{\;\;^\circ } \), nuclear force is ineffective and only electrostatic force of repulsion is present. This is very high at this distance because nuclear force is not acting now and the gravitational force is very feeble. \({F_{{\rm{nuclear }}}} < < {F_{{\rm{electrostatic }}}}\) in this case.
PHXII13:NUCLEI
363807
Assertion : Generally heavy nuclei are unstable. Reason : Heavy nucleus has more neutrons and protons.
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:
Within heavy nuclei, the repulsive forces among the protons exert a greater influence compared to the nuclear attractive forces. To adjust \(\dfrac{n}{p}\), radioactivity takes place. So correct option is (2).
363804
Assertion : Nuclear force has limited range, unlike electric and gravitational forces. Reason : Nuclear force obeys inverse square law.
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:
Electrostatic and gravitational forces obey inverse square law and are of long range and are central forces (r-dependent). But nuclear forces do not follow \(\left(\dfrac{1}{r^{2}}\right)\) law. They 'glue' neutrons and protons together. So correct option is (3).
PHXII13:NUCLEI
363805
Assertion : Two protons can attract each other. Reason : The distance between the protons within the nucleus is about \({10^{ - 15}}\;m\).
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:
Protons experience repulsion due to electrostatic forces. At short distances, strong nuclear forces dominate. Net force on close protons turns attractive. So correct option is \((1)\).
PHXII13:NUCLEI
363806
Two protons are kept at a separation of \(40\mathop A\limits^ \circ \). \({F_n}\) is the nuclear force and\({F_e}\) is the electrostatic force between them. Then
1 \({F_n} < < {F_e}\)
2 \(F_{n} \approx F_{e}\)
3 \({F_n} > > {F_c}\)
4 \(F_{n}=F_{e}\)
Explanation:
Nuclear force is much stronger than the electrostatic force inside the nucleus \(i.e.,\) at distances of the order of fermi. At 40 \(\mathop {{\rm{ }}A}\limits^{\;\;^\circ } \), nuclear force is ineffective and only electrostatic force of repulsion is present. This is very high at this distance because nuclear force is not acting now and the gravitational force is very feeble. \({F_{{\rm{nuclear }}}} < < {F_{{\rm{electrostatic }}}}\) in this case.
PHXII13:NUCLEI
363807
Assertion : Generally heavy nuclei are unstable. Reason : Heavy nucleus has more neutrons and protons.
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:
Within heavy nuclei, the repulsive forces among the protons exert a greater influence compared to the nuclear attractive forces. To adjust \(\dfrac{n}{p}\), radioactivity takes place. So correct option is (2).
363804
Assertion : Nuclear force has limited range, unlike electric and gravitational forces. Reason : Nuclear force obeys inverse square law.
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:
Electrostatic and gravitational forces obey inverse square law and are of long range and are central forces (r-dependent). But nuclear forces do not follow \(\left(\dfrac{1}{r^{2}}\right)\) law. They 'glue' neutrons and protons together. So correct option is (3).
PHXII13:NUCLEI
363805
Assertion : Two protons can attract each other. Reason : The distance between the protons within the nucleus is about \({10^{ - 15}}\;m\).
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:
Protons experience repulsion due to electrostatic forces. At short distances, strong nuclear forces dominate. Net force on close protons turns attractive. So correct option is \((1)\).
PHXII13:NUCLEI
363806
Two protons are kept at a separation of \(40\mathop A\limits^ \circ \). \({F_n}\) is the nuclear force and\({F_e}\) is the electrostatic force between them. Then
1 \({F_n} < < {F_e}\)
2 \(F_{n} \approx F_{e}\)
3 \({F_n} > > {F_c}\)
4 \(F_{n}=F_{e}\)
Explanation:
Nuclear force is much stronger than the electrostatic force inside the nucleus \(i.e.,\) at distances of the order of fermi. At 40 \(\mathop {{\rm{ }}A}\limits^{\;\;^\circ } \), nuclear force is ineffective and only electrostatic force of repulsion is present. This is very high at this distance because nuclear force is not acting now and the gravitational force is very feeble. \({F_{{\rm{nuclear }}}} < < {F_{{\rm{electrostatic }}}}\) in this case.
PHXII13:NUCLEI
363807
Assertion : Generally heavy nuclei are unstable. Reason : Heavy nucleus has more neutrons and protons.
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:
Within heavy nuclei, the repulsive forces among the protons exert a greater influence compared to the nuclear attractive forces. To adjust \(\dfrac{n}{p}\), radioactivity takes place. So correct option is (2).
363804
Assertion : Nuclear force has limited range, unlike electric and gravitational forces. Reason : Nuclear force obeys inverse square law.
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:
Electrostatic and gravitational forces obey inverse square law and are of long range and are central forces (r-dependent). But nuclear forces do not follow \(\left(\dfrac{1}{r^{2}}\right)\) law. They 'glue' neutrons and protons together. So correct option is (3).
PHXII13:NUCLEI
363805
Assertion : Two protons can attract each other. Reason : The distance between the protons within the nucleus is about \({10^{ - 15}}\;m\).
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:
Protons experience repulsion due to electrostatic forces. At short distances, strong nuclear forces dominate. Net force on close protons turns attractive. So correct option is \((1)\).
PHXII13:NUCLEI
363806
Two protons are kept at a separation of \(40\mathop A\limits^ \circ \). \({F_n}\) is the nuclear force and\({F_e}\) is the electrostatic force between them. Then
1 \({F_n} < < {F_e}\)
2 \(F_{n} \approx F_{e}\)
3 \({F_n} > > {F_c}\)
4 \(F_{n}=F_{e}\)
Explanation:
Nuclear force is much stronger than the electrostatic force inside the nucleus \(i.e.,\) at distances of the order of fermi. At 40 \(\mathop {{\rm{ }}A}\limits^{\;\;^\circ } \), nuclear force is ineffective and only electrostatic force of repulsion is present. This is very high at this distance because nuclear force is not acting now and the gravitational force is very feeble. \({F_{{\rm{nuclear }}}} < < {F_{{\rm{electrostatic }}}}\) in this case.
PHXII13:NUCLEI
363807
Assertion : Generally heavy nuclei are unstable. Reason : Heavy nucleus has more neutrons and protons.
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:
Within heavy nuclei, the repulsive forces among the protons exert a greater influence compared to the nuclear attractive forces. To adjust \(\dfrac{n}{p}\), radioactivity takes place. So correct option is (2).
