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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 5
36.
Some ceramic materials become superconducting
below liquid helium temperature
between liquid helium and liquid nitrogen temperature
above liquid nitrogen but below room temperature
at room temperature
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.

Assertion (A): Doping level in extrinsic semiconductors is very small.

Reason (R): Additional of impurity in the ratio of 1 part in 108 parts increases the number of charge carriers by about 20.

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.
38.
The core of an atom consists of
nucleus
nucleus and all orbits
nucleus and inner orbits
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.

Assertion (A): Copper is a good conductor of electricity.

Reason (R): Copper has a face centred cubic 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:

Conductivity does not depend on lattice structure.

40.
When a dielectric is subjected to an electric field E, each volume element of dielectric can be considered to be carrying an electric dipole moment.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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