The hysteresis phenomenon in ferromagnetic materials exists at all temperatures.

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Question
The hysteresis phenomenon in ferromagnetic materials exists at all temperatures.
Options
A. True
B. False

Correct Answer

False

Explanation

Hysteresis phenomenon exists below ferromagnetic curie temperature.

Materials and Components problems

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3. Assertion (A): Silicon is less sensitive to changes in temperature than germanium.
Reason (R): Cut in voltage in silicon is less than that in germanium.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

5. If ?_r' and ?_r" are the real and imaginary parts of complex dielectric constant ?_r, and ? is the loss angle. Then
Options
A.
B.
C. tan ? = ?'?"
D. tan ? = 1 - ?'

6. In paramagnetic materials
Options
A. permanent magnetic dipoles exist but the interaction between neighbouring dipoles is negligible
B. permanent magnetic dipole do not exist
C. permanent magnetic dipoles exist and the interaction between neighbouring dipoles is very strong
D. permanent magnetic dipole moment may or may not exist

7. The apparent capacitance at a high angular frequency ? of an air cored capacitor having capacitance C and inductance L is given by
Options
A.
B.
C.
D.

8. Ferroelectric materials are those which
Options
A. cannot be polarized
B. have a permanent polarization
C. have a_e equal to zero
D. have ?_p = 0

9. At room temperature, the current in intrinsic semiconductor is due to
Options
A. holes
B. electrons
C. ions
D. holes and electrons

10. Assertion (A): Atomic number of sodium is 11.
Reason (R): Sodium has a body centred cubic lattice.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

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