Assertion (A): Ferromagnetic materials possess ferromagnetic properties only whe

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Question
Assertion (A): Ferromagnetic materials possess ferromagnetic properties only when temperature is less than paramagnetic curie temperature.
Reason (R): For a ferromagnetic material for T > ?_f.
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

Correct Answer

Both A and R are true and R is correct explanation of A

Materials and Components problems

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1. In carbon resistor colour code, if the third band is of silver, it indicates
Options
A. that three zeros are to be added to indicate the resistance value
B. multiplier is 0.01
C. multiplier is 0.1
D. tolerance is � 5%

3. The orientation polarization is
1. directly proportional to temperature
2. inversely proportional to temperature
3. inversely proportional to square of permanent dipole moment
4. directly proportional to square of permanent dipole moment.
Which of the above are correct?
Options
A. 1 and 3 only
B. 2 and 3 only
C. 1 and 4 only
D. 2 and 4 only

6. A liquid has N permanent dipoles ?_p per unit volume and has been subjected to dc field for a long time such that orientation polarization is P₀. At t = 0, the field is suddenly removed, then polarization
Options
A. will remain constant at P₀
B. will become zero at t = 0
C. will delay to zero with a time constant
D. either b or c

9. As per Bohr's postulate, only those circular orbits are stable for which the angular momentum is equal to an integer times .
Options
A. True
B. False

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