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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 7
1.
The dielectric losses do not depend on frequency.
True
False
Answer: Option
Explanation:

Dielectric losses vary with frequency.

2.

Assertion (A): Holes are majority carriers in p type semiconductor.

Reason (R): In p type semiconductor, the electrons produced by thermal agitation recombine with holes.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
If t is relaxation time and tc is average time between collisions, then in an isotropic metal
t = tc
t < tc
tc < t
T = 0.01 te
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.

Assertion (A): Resistivity of a perfect single crystal of a metal goes to zero as T approaches zero.

Reason (R): Scattering of electrons is due to deviations from perfect periodicity of lattice.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
Fleming's left hand rule is used to find
direction of force on a current carrying conductor
direction of flux in solenoid
direction of magnetic field due to a current carrying conductor
direction of induced emf
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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