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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 2
21.
In molecules of ionic crystals, orientation polarization is zero.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.

Assertion (A): CO2 has no resultant dipole moment but CO has a dipole moment.

Reason (R): The structure of CO2 is O = C = O.

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.
23.
For a photoconductor with equal electron and hole mobilities and perfect ohmic contacts at the ends, an increase in intensity of optical illumination results in
a change in o.c voltage
a change in s.c current
decrease in resistance
increase in resistance
Answer: Option
Explanation:

It is the characteristic of a photoconductor that its resistance decreases with increase in illumination.

24.
A permeable substance is one
which is strong magnet
which is a weak magnet
which is a good conductor
through which magnetic lines of force can pass easily
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
When subjected to alternating stresses, an insulating material is characterised by complex dielectric constant ∈'r - j∈"r . In such materials, the dielectric losses under alternating stress is proportional
∈"r
both ∈'r and ∈"r
∈'r
(∈"r)2
Answer: Option
Explanation:

The imaginary part of ∈r gives rise to absorption of energy.

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