Nichrome is used for overhead line wires heater coils lamp filaments all of the

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1. 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

4. 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

5. 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

6. In a specimen of silicon steel, a field strength of 200 A/m causes a flux density of 0.5 T. In a specimen of cast iron, the same H would cause B to be
Options
A. 0.5 T
B. less than 0.5 T
C. more than 0.5 T
D. 0.5 T or more or less

10. For a multiplate capacitor having n plates, A as area of each plate, the capacitance is proportional to
Options
A. n A
B. (n - 1) A
C. (n + 1) A
D.

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