Electronics and Communication Engineering - Materials and Components

11. 

The resistivity of intrinsic semiconductors, at room temperature, is of the order of

A. 1 Ω-m
B. 1000 Ω-m
C. 106 Ω-m
D. 10-3 Ω-m

Answer: Option A

Explanation:

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12. 

Assertion (A): Ferromagnetic materials possess ferromagnetic properties only when temperature is less than paramagnetic curie temperature.

Reason (R): For a ferromagnetic material for T > θf.

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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13. 

In terms of classical representation of electrons

A. an atom is essentially empty
B. an atom is essentially full
C. an atom may be essentially empty or full depending on the material
D. an atom may be essentially empty or full depending on temperature

Answer: Option A

Explanation:

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14. 

To produce magnetic flux, mmf is necessary.

A. True
B. False

Answer: Option A

Explanation:

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15. 

For a polyatomic gas, the equation relating dielectric constant ∈r with molecular properties is

A.
B.
C.
D.

Answer: Option A

Explanation:

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