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 5 of 44

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Q41.
A specimen of metal has n valence electrons per m³. If vx is the average velocity of these electrons, each having a charge e, the current density J is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (b).B
Q42.
A metal has a large number of free electrons. If e is electronic charge and m is mass of electron and an electric field E is applied along (say) x direction, the electrons acquire a velocity having a component vx is x direction. Then

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (c).C
Q43.
If m is the mass of electron cloud, the equation of motion of electron cloud in the presence of an alternating electric field is of the form

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q44.
If Bmax is the maximum flux density, hysteresis loss is proportional to

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (b).B
Q45.
If Bmax is the maximum flux density, eddy current loss is proportional to

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q46.
A vacuum parallel plate capacitor is charged. The field between the plates is 2 x 10โด V/m. If the space between the plates is filled with a material having โˆˆแตฃ = 10, then the value of field in the dielectric will be

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q47.
In p type semiconductor, the conductivity due to holes is (e = charge on hole, ฮผp = hole mobility, p = hole concentration)

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (c).C
Q48.
An electron is moving around a proton, in a circle of radius R. If flux density in the region is increased from zero to B, the force on the electron is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q49.
If ฮผp is permanent dipole moment and T is absolute temperature, the orientation polarization of polyatomic gases is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (b).B
Q50.
Assertion (A): At a temperature of 1000 K, thermionic emission current is about 0.1 A/cm² of surface.Reason (R): Thermionic emission current is given by Ith = SAโ‚€ 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
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