Electronics and Communication Engineering :: Materials and Components Section 1

 Materials and Components Section 1

1.Diamond is a paramagnetic material.
A.True
B.False

Answer: Option B

Explanation:

Diamond is diamagnetic.

2.Which capacitor-store higher amount of energy?
A.Air capacitor
B.Paper capacitor
C.Mica capacitor
D.Plastic film capacitor

Answer: Option C

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.
A.True
B.False

Answer: Option B

Explanation:

Spontaneous polarization vanishes above ferro-electric Curie temperature.

4.In paramagnetic materials
A.permanent magnetic dipoles exist but the interaction between neighbouring dipoles is negligible
B.permanent magnetic dipole do not exist
C.permanent magnetic dipoles exist and the interaction between neighbouring dipoles is very strong
D.permanent magnetic dipole moment may or may not exist

Answer: Option A

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.

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:

Atomic number is not dependent on lattice structure.

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