materials-and-components electronics-and-communication-engineering question and answers -Page 26

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Materials and Components problems

1. Assertion (A): Ionic solids, in general, have no electrical conductivity.
Reason (R): In ionic solids, electrons are tightly bound to the nucleus.
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

4. When temperature is above ferromagnetic Curie temperature, a ferromagnetic material
Options
A. becomes a paramagnetic material
B. becomes a very strong ferromagnetic material
C. becomes diamagnetic material
D. none of the above

5. The number of turns in a coil is doubled. If initial time constant is T, the new time constant is
Options
A. T
B. 2T
C. 4T
D.

7. When Schrodinger equation is applied to the motion of electron in the field of protons, the physically acceptable solutions for the wave function exist for quantum number which are
Options
A. 2
B. 3
C. 4
D. 5

9. Assertion (A): An amorphous material is obtained when mobility of atoms is inhibited during solidification.
Reason (R): Crystalline state is a natural state for most solids.
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

10. An air cored inductance is a
Options
A. linear circuit element because its reactance varies linearly with voltage at a fixed frequency
B. linear circuit element because its current varies linearly with voltage at a fixed frequency
C. nonlinear circuit element due to saturation of core
D. nonlinear circuit element because v =

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