Materials and Components MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Materials and Components, a fundamental topic in the field of Electronics and Communication Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Materials and Components MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Materials and Components mcq questions that explore various aspects of Materials and Components problems. Each MCQ is crafted to challenge your understanding of Materials and Components principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Electronics and Communication Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Materials and Components MCQs are your pathway to success in mastering this essential Electronics and Communication Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Materials and Components. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Materials and Components knowledge to the test? Let's get started with our carefully curated MCQs!

Materials and Components MCQs | Page 12 of 44

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Q111.
Assertion (A): Silicon is the most favoured semiconductor material.
Reason (R): PIV for silicon diode is more than that for germanium diode.

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

Discuss
Answer: (c).A is true but R is false
Q112.
Assertion (A): When cathode temperature is increased from 2500 K to 2550 K, thermionic emission current may increase by about 50%.
Reason (R): Thermionic emission current ∝ T² e^(-Ew/kT).

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

Discuss
Answer: (a).Both A and R are true and R is correct explanation of A
Q113.
The relationship of hysteresis loss to maximum flux density was first determined by

a.

C. Steinmetz

b.

G.R. Kirchoff

c.

Mr. Laplace

d.

Mr. Ampere

Discuss
Answer: (a).C. Steinmetz
Q114.
In metals the thermal conductivity K and electrical conductivity σ are related as (K/σT) = L, L is known as

a.

Lattice constant

b.

Lorentz number

c.

Lanevin function

d.

Larmor number

Discuss
Answer: (b).Lorentz number
Q115.
Assertion (A): If WF is Fermi energy, v is velocity of electron and m is mass of electron, then 1/2mv² = WF .
Reason (R): Conductivity of a metal depends on temperature and impurity concentration.

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

Discuss
Answer: (b).Both A and R are true but R is not correct explanation of A
Q116.
Dielectric constant of transformer oil is about

a.

1

b.

4

c.

10

d.

20

Discuss
Answer: (b).4
Q117.
Assertion (A): When an electron is revolving in its orbit and magnetic field is also present, the angular frequency of electron will be affected by the magnetic field.Reason (R): In the case of electron revolving in its orbit in the presence of magnetic field, the orbital magnetic dipole moment is not affected by the presence of magnetic field.

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

Discuss
Answer: (c).A is true but R is false
Q118.
When a material becomes a superconductor, its resistivity becomes

a.

very small

b.

zero

c.

about 10% of normal value

d.

about 20% of normal value

Discuss
Answer: (b).zero
Q119.
In a piezoelectric crystal, the application of mechanical force will cause

a.

plastic deformation of crystal

b.

magnetic dipoles in the crystal

c.

electrical polarization in the crystal

d.

shift in Fermi level

Discuss
Answer: (b).magnetic dipoles in the crystal
Q120.
Consider the following statement:

If an electric field is applied to an n type semiconductor bar, the electrons and holes move in opposite directions due to their opposite charges. The net currents is
1. both due to electrons and holes with electrons as majority carriers
2. sum of hole and electron currents
3. difference between electron and hole currents.

Which of above statements are correct?

a.

1 only

b.

1 and 2

c.

2 only

d.

3 only

Discuss
Answer: (b).1 and 2
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