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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 1
1.
Diamond is a paramagnetic material.
True
False
Answer: Option
Explanation:

Diamond is diamagnetic.

2.
Which capacitor-store higher amount of energy?
Air capacitor
Paper capacitor
Mica capacitor
Plastic film capacitor
Answer: Option
Explanation:

Energy stored is proportional to capacitance and capacitance is proportional to permittivity.

3.
Above ferroelectric curie temperature, spontaneous polarization in ferroelectric materials becomes stronger.
True
False
Answer: Option
Explanation:

Spontaneous polarization vanishes above ferro-electric Curie temperature.

4.
In paramagnetic materials
permanent magnetic dipoles exist but the interaction between neighbouring dipoles is negligible
permanent magnetic dipole do not exist
permanent magnetic dipoles exist and the interaction between neighbouring dipoles is very strong
permanent magnetic dipole moment may or may not exist
Answer: Option
Explanation:

In paramagnetic materials interaction between neighbouring dipoles is negligible.

5.

Assertion (A): Atomic number of sodium is 11.

Reason (R): Sodium has a body 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:

Atomic number is not dependent on lattice structure.

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