Electronics and Communication Engineering - Materials and Components

1. 

The dielectric losses do not depend on frequency.

A. True
B. False

Answer: Option B

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.

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

Answer: Option A

Explanation:

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3. 

If t is relaxation time and tc is average time between collisions, then in an isotropic metal

A. t = tc
B. t < tc
C. tc < t
D. T = 0.01 te

Answer: Option A

Explanation:

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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.

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

Answer: Option B

Explanation:

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5. 

Fleming's left hand rule is used to find

A. direction of force on a current carrying conductor
B. direction of flux in solenoid
C. direction of magnetic field due to a current carrying conductor
D. direction of induced emf

Answer: Option A

Explanation:

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