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Magnetism and Matter - 06
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Q1. When the temperature of a magnetic material decreases, the magnetization
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1 point
decreases in a diamagnetic material
remains the same in a diamagnetic material
decreases in a ferromagnetic material
decreases in a paramagnetic material
Q2. Identify the correctly matched pair
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1 point
Diamagnetic - Gadolinium
Soft ferromagnetic - Alnico
Hard ferromagnetic - Copper
Paramagnetic - Sodium
Q3. A magnetic needle is kept in a non-uniform magnetic field. It experiences
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1 point
neither a force nor a torque
a force but not a torque
a force and a torque
a torque but not a force
Q4. Susceptibility is positive and large for a
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1 point
paramagnetic substance
ferromagnetic substance
diamagnetic substance
non magnetic substance
Q5. Relative permittivity and permeability of a material are εr and µr, respectively. Which of the following values of these quantities are allowed for a diamagnetic material ?
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1 point
a
b
c
d
Q6. Magnetic permeability is maximum for
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1 point
diamagnetic substance
paramagnetic substance
ferromagnetic substance
All of the above
Q7. When a piece of a ferromagnetic substance is put in a uniform magnetic field, the flux density inside it is four times the flux density away from the piece. The magnetic permeability of the material is
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1 point
4
1
3
2
Q8. Demagnetisation of magnets can be done by
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1 point
rough handling
heating
magnetising in the opposite direction
All of the above
Q9. A diamagnetic material in a magnetic field moves
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1 point
perpendicular to the field
from stronger to the weaker parts of the field
from weaker to the stronger parts of the field
None of them
Q10. A ferromagnetic material is heated above its curie temperature. Which one is a correct statement?
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1 point
Ferromagnetic domains are perfectly arranged
Ferromagnetic domains become random
Ferromagnetic domains are not influenced
Ferromagnetic material changes into diamagnetic material
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