# Magnetic materials mcq with answers part 3

This sets of mcq contains objectives on magnetic materials, parameters of magnetic material, Magnetic Susceptibility, Diamagnetism, Paramagnetism, Ferromagnetism, Ferri-magnetism, Ferro-magnetic, Curie-Weiss law, Magnetostriction and more in part 3...

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## SET 1 of magnetic materials mcq's

1. The susceptibility of a diamagnetic material is near about
A. 105
B. 107
C. -10-5
D. 10-5

Marks 1

2. Diamagnetism occurs in compliance with
A. Lenz's law
B. Ampere's law
C. Newton's law
D. none of these

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3. Curie-Weiss law is
A. χ m = C/T
B. χ m = C/θ
C. χ m = C /(T-θ)
D. χ m=C/(θ-T)

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4. Permanent dipole moment consists of the following angular momentum
A. orbital angular momentum of electron
B. electron spin angular momentum
C. nuclear spin angular momentum
D. all of them

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5. Each ferromagnetic material has a characteristic temperature above which its properties are vitally different from those below it. This temperature is called
A. Demagnetization temperature
B. Curie temperature
C. Transition temperature

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6. For a ferromagnetic material, if θ is the paramagnetic curie temperature, then the relation of susceeptibility χ with Curie constant C
A. χ = C/T
B. χ = C/(T-θ)
C. χ = C(T-θ)
D. χ = C (θ – T)

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7. For paramagnetic materials, the relative magnetic permeability µr at room temperature is near
A. 1
B. 10
C. zero
D. 1/10.

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8. The ferromagnetic Curie temperature in degrees absolute for nickel is
A. 631
B. 1043
C. 990
D. 361

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9. Relative permeability µr for pure iron is
A. 1000
B. 3000
C. 5000
D. 7000

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10. The following material is used for making permanent magnets
A. platinum cobalt
B. Alnico V
C. carbon steel
D. all of these

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## SET 2 of magnetic materials mcq's

11. The converse of magnetostriction effect is
A. Thompson effect
B. Villari effect
C. Curie effect
D. Bitter powder effect.

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12. Magnetostriction is the phenomenon
A. of producing electricity in ferromgnetic materials
B. of producing magnetism in conductors
C. of changes in permeability of ferromagnetic material during magnetization
D. of changes in physical dimensions of ferromagnetic materials during magnetization

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13. Magnetostriction effect is negative in
A. Nickel
B. cobalt
C. both nickel and cobalt
D. none of these

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14. The temperature below which certain materials are antiferromagnetic and above which  they are paramagnetic is called
A. Curie temperature
B. Neel temperature
C. Transition temperature
D. Weiss temperature

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15. Magnetostriction is…
A. induced magnetism
B. volume changes accompanying magnetization
C. rate of magnetization
D. rate of loss of magnetization

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16. For which of the following materials the net magnetic moment is zero?
A. ferromagnetic materials
B. paramagnetic materials
C. antiferromagnetic materials
D. ferrimagnetic materials

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17. ferrites are….
A. not easily machinable
B. hard materials
C. brittle materials
D. materials possessing all of the above properties

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18. Bohr magneton is a unit of
A. magnetic energy
B. magnetic moment.
C. polarizability
D. hysteresis loss

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19. The magnetic field required to reduce the residual magnetization to zero is called
A. retentivity
B. coercivity
C. hysteresis
D. saturation magnetisation

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20. What is the material with equal, anti parallel atomic magnetic moments known as _____________
A. Ferrimagnetic
B. Ferrite
C. Ferromagnetic
D. Anti ferromagnetic

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## SET 3 of magnetic materials mcq's

21. Metallic copper is
A. paramagnetic substance
B. diamagnetic substance
C. ferromagnetic substance
D. ferrimagnetic substance

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22. Which one of the following has maximum permeability?
A. grain oriented Si steel
B. 4% Si steel
C. pure iron
D. none of these

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23. The hysteresis loop for material of transformer core should be
A. short and narrow
B. tall and narrow
C. short and wide
D. tall and wide

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24. The change in dimensions during the process of magnetizations termed as
A. skin effect
B. magnetostriction
C. hall effect
D. peltrs effect

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25. Area of hysteresis loop represents
A. copper loss
B. eddy current loss
C. hysteresis loss
D. iron loss

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26. For a magnetic material, magnetic field density (B) & magnetic field intensity (H) given as
A. B α H
B. B α 1/H
C. H α B
D. H α 1/B

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27. The magnetic flux density B is given as_________ Where Φ= magnetic flux; A= Area.
A. B=Φ/A
B. B=A/Φ
C. B=Φ×A
D. None of this

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28. The magnetic field strength required to reduce the residual magnetization to zero is called
A. retentivity
B. coercivity
C. hysteresis
D. saturation magnetization

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29. The curie temperature of iron is
A. 1035 K
B. 1400 K
C. 1500 K
D. 1200 K

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30. Example for soft magnet
A. 45 Permalloy
B. CrO2
C. Fe-Pd
D. Alnico

Marks 1

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