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 26 of 44

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Q251.
As the temperature of semiconductor is increased

a.

the average number of free charge carriers decreases

b.

the average number of free charge carriers increases

c.

the average number of free charge carriers remains the same

d.

the average number of free charge carriers may increase or decrease

Discuss
Answer: (b).the average number of free charge carriers increases
Q252.
In anti-ferromagnetic materials, the graph of susceptibility versus temperature shows a sharp maximum at a certain temperature. This temperature is known as

a.

Curie temperature

b.

Neel temperature

c.

Weiss temperature

d.

Bitter temperature

Discuss
Answer: (b).Neel temperature
Q253.
The wavelength of light emitted by GaAs laser is 8670 x 10¯¹แดผ m. If h = 6.626 x 10¯³โด Js, velocity of light = 3 x 10โธ m/s and eV = 1.602 x 10¯¹โน J, the energy gap in GaAs is

a.

0.18 eV

b.

0.7 eV

c.

1.43 eV

d.

2.39 eV

Discuss
Answer: (c).1.43 eV
Q254.
Diamagnetic materials do not have permanent magnetic dipoles.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q255.
A piece of copper and another piece of Germanium are cooled from 30°C to 80 K. The resistance of

a.

copper decreases and germanium increases

b.

both decreases

c.

both increases

d.

copper increases and germanium decreases

Discuss
Answer: (a).copper decreases and germanium increases
Q256.
The dipole moment per unit volume P as a function of E for an insulator is

a.

P = โˆˆโ‚€ E(โˆˆแตฃ)

b.

P = โˆˆโ‚€ E

c.

P = โˆˆโ‚€(โˆˆแตฃ - 1) E

d.

P = E/ โˆˆ(โˆˆแตฃ - 1)

Discuss
Answer: (c).P = โˆˆโ‚€(โˆˆแตฃ - 1) E
Q257.
A good dielectric should have

a.

low losses

b.

good heat conductivity

c.

high intrinsic strength

d.

all of the above

Discuss
Answer: (d).all of the above
Q258.
Magnetic hysteresis phenomenon is explained by

a.

motion of domain walls

b.

motion of domain walls and domain rotation

c.

domain rotation

d.

none of the above

Discuss
Answer: (b).motion of domain walls and domain rotation
Q259.
The relation between thermal conductivity K (W/m/°C), heat flow density Q (watt/m²) and dT/dx (°C per metre) is

a.

Q = K(dT/dx)

b.

Q = - K(dT/dx)

c.

K = Q(dT/dx)

d.

dT/dx = - QK

Discuss
Answer: (b).Q = - K(dT/dx)
Q260.
Assertion (A): The equation D = โˆˆโ‚€โˆˆแตฃE is applicable only to isotropic materials.

Reason (R): In polycrystalline materials, the directional effects are absent.

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
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