NEET Test Series from KOTA - 10 Papers In MS WORD
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PHXII05:MAGNETISM and MATTER
360509
Assertion : Soft iron is used as a core of transformer. Reason : Area of hysteresis - loop for soft iron is small.
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:
Soft iron is a common choice for the core material in transformers due to its high permeability. This property allows it to effectively conduct magnetic flux and enhance the magnetic field within the core, facilitating efficient energy transfer between primary and secondary coils. Assertion is true. A small area (as for soft iron) hysteresis loop implies lower hysteresis losses, which helps minimize energy loss as the magnetic field reverses direction during each \(A C\) cycle. (However, other factors for soft iron are its high permeability, low electrical resistance and high magnetic susceptibility). Both statements are correct and Reason also contributes to Assertion. So correct option is (1).
PHXII05:MAGNETISM and MATTER
360510
Assertion : A soft iron core is used in a moving coil galvanometer to increase the strength of magnetic field. Reason : From soft iron, more number of the magnetic lines of force passes.
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:
A soft iron core in a moving coil galvanometer enhances the magnetic field strength, as soft iron is ferromagnetic and concentrates magnetic lines of force. This increases the galvanometer's sensitivity to small currents and magnetic fields. Sensitivity \(=\left(\dfrac{\text { Deflection angle }}{\text { current }}\right)\) So correct option is (1).
PHXII05:MAGNETISM and MATTER
360511
The material suitable for making electromagnets should have
1 high retentivity and high coercivity
2 low retentivity and low coercivity
3 high retentivity and low coercivity
4 low retentivity and high coercivity
Explanation:
Conceptual Question
PHXII05:MAGNETISM and MATTER
360512
Assertion : For making permanent magnets, steel is preferred over soft iron. Reason : Retentivity of steel is equal to that of soft iron.
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:
(Sub scripts : R for Retentinity C for coercivity) Observe that : \(B_{R} < B^{\prime}{ }_{R}\) but \(\mathrm{H}_{C}>H^{\prime}{ }_{C}\) (magnitude) Reason is false. For assertion, we have: Coercivity is a measure of meterials resistance to demagnetisation \(\Rightarrow\) Steel retains magnetisation ofer long period. \(\Rightarrow\) Steel is used for permanent magnets. So correct option is (3).
360509
Assertion : Soft iron is used as a core of transformer. Reason : Area of hysteresis - loop for soft iron is small.
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:
Soft iron is a common choice for the core material in transformers due to its high permeability. This property allows it to effectively conduct magnetic flux and enhance the magnetic field within the core, facilitating efficient energy transfer between primary and secondary coils. Assertion is true. A small area (as for soft iron) hysteresis loop implies lower hysteresis losses, which helps minimize energy loss as the magnetic field reverses direction during each \(A C\) cycle. (However, other factors for soft iron are its high permeability, low electrical resistance and high magnetic susceptibility). Both statements are correct and Reason also contributes to Assertion. So correct option is (1).
PHXII05:MAGNETISM and MATTER
360510
Assertion : A soft iron core is used in a moving coil galvanometer to increase the strength of magnetic field. Reason : From soft iron, more number of the magnetic lines of force passes.
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:
A soft iron core in a moving coil galvanometer enhances the magnetic field strength, as soft iron is ferromagnetic and concentrates magnetic lines of force. This increases the galvanometer's sensitivity to small currents and magnetic fields. Sensitivity \(=\left(\dfrac{\text { Deflection angle }}{\text { current }}\right)\) So correct option is (1).
PHXII05:MAGNETISM and MATTER
360511
The material suitable for making electromagnets should have
1 high retentivity and high coercivity
2 low retentivity and low coercivity
3 high retentivity and low coercivity
4 low retentivity and high coercivity
Explanation:
Conceptual Question
PHXII05:MAGNETISM and MATTER
360512
Assertion : For making permanent magnets, steel is preferred over soft iron. Reason : Retentivity of steel is equal to that of soft iron.
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:
(Sub scripts : R for Retentinity C for coercivity) Observe that : \(B_{R} < B^{\prime}{ }_{R}\) but \(\mathrm{H}_{C}>H^{\prime}{ }_{C}\) (magnitude) Reason is false. For assertion, we have: Coercivity is a measure of meterials resistance to demagnetisation \(\Rightarrow\) Steel retains magnetisation ofer long period. \(\Rightarrow\) Steel is used for permanent magnets. So correct option is (3).
360509
Assertion : Soft iron is used as a core of transformer. Reason : Area of hysteresis - loop for soft iron is small.
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:
Soft iron is a common choice for the core material in transformers due to its high permeability. This property allows it to effectively conduct magnetic flux and enhance the magnetic field within the core, facilitating efficient energy transfer between primary and secondary coils. Assertion is true. A small area (as for soft iron) hysteresis loop implies lower hysteresis losses, which helps minimize energy loss as the magnetic field reverses direction during each \(A C\) cycle. (However, other factors for soft iron are its high permeability, low electrical resistance and high magnetic susceptibility). Both statements are correct and Reason also contributes to Assertion. So correct option is (1).
PHXII05:MAGNETISM and MATTER
360510
Assertion : A soft iron core is used in a moving coil galvanometer to increase the strength of magnetic field. Reason : From soft iron, more number of the magnetic lines of force passes.
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:
A soft iron core in a moving coil galvanometer enhances the magnetic field strength, as soft iron is ferromagnetic and concentrates magnetic lines of force. This increases the galvanometer's sensitivity to small currents and magnetic fields. Sensitivity \(=\left(\dfrac{\text { Deflection angle }}{\text { current }}\right)\) So correct option is (1).
PHXII05:MAGNETISM and MATTER
360511
The material suitable for making electromagnets should have
1 high retentivity and high coercivity
2 low retentivity and low coercivity
3 high retentivity and low coercivity
4 low retentivity and high coercivity
Explanation:
Conceptual Question
PHXII05:MAGNETISM and MATTER
360512
Assertion : For making permanent magnets, steel is preferred over soft iron. Reason : Retentivity of steel is equal to that of soft iron.
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:
(Sub scripts : R for Retentinity C for coercivity) Observe that : \(B_{R} < B^{\prime}{ }_{R}\) but \(\mathrm{H}_{C}>H^{\prime}{ }_{C}\) (magnitude) Reason is false. For assertion, we have: Coercivity is a measure of meterials resistance to demagnetisation \(\Rightarrow\) Steel retains magnetisation ofer long period. \(\Rightarrow\) Steel is used for permanent magnets. So correct option is (3).
360509
Assertion : Soft iron is used as a core of transformer. Reason : Area of hysteresis - loop for soft iron is small.
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:
Soft iron is a common choice for the core material in transformers due to its high permeability. This property allows it to effectively conduct magnetic flux and enhance the magnetic field within the core, facilitating efficient energy transfer between primary and secondary coils. Assertion is true. A small area (as for soft iron) hysteresis loop implies lower hysteresis losses, which helps minimize energy loss as the magnetic field reverses direction during each \(A C\) cycle. (However, other factors for soft iron are its high permeability, low electrical resistance and high magnetic susceptibility). Both statements are correct and Reason also contributes to Assertion. So correct option is (1).
PHXII05:MAGNETISM and MATTER
360510
Assertion : A soft iron core is used in a moving coil galvanometer to increase the strength of magnetic field. Reason : From soft iron, more number of the magnetic lines of force passes.
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:
A soft iron core in a moving coil galvanometer enhances the magnetic field strength, as soft iron is ferromagnetic and concentrates magnetic lines of force. This increases the galvanometer's sensitivity to small currents and magnetic fields. Sensitivity \(=\left(\dfrac{\text { Deflection angle }}{\text { current }}\right)\) So correct option is (1).
PHXII05:MAGNETISM and MATTER
360511
The material suitable for making electromagnets should have
1 high retentivity and high coercivity
2 low retentivity and low coercivity
3 high retentivity and low coercivity
4 low retentivity and high coercivity
Explanation:
Conceptual Question
PHXII05:MAGNETISM and MATTER
360512
Assertion : For making permanent magnets, steel is preferred over soft iron. Reason : Retentivity of steel is equal to that of soft iron.
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:
(Sub scripts : R for Retentinity C for coercivity) Observe that : \(B_{R} < B^{\prime}{ }_{R}\) but \(\mathrm{H}_{C}>H^{\prime}{ }_{C}\) (magnitude) Reason is false. For assertion, we have: Coercivity is a measure of meterials resistance to demagnetisation \(\Rightarrow\) Steel retains magnetisation ofer long period. \(\Rightarrow\) Steel is used for permanent magnets. So correct option is (3).
