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 16 of 44

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Q151.
The temperature coefficient of a thermistor

a.

is positive

b.

is negative

c.

zero

d.

may be positive or negative depending on its composition

Discuss
Answer: (b).is negative
Q152.
Assertion (A): Helium, Argon and Neon are gaseous at room temperature.

Reason (R): The atoms in Helium, Argon and Neon are chemically extremely inactive.

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
Q153.
Assertion (A): For most metals, Fermi energy EF is less than 10 eV.

Reason (R): Fermi level of a metal is given by EF = 3.64 x 10^-19 (n)^2/3 where n is number of free electrons/m³ of metal.

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
Q154.
The capacitance of an insulated conducting sphere of radius R in vacuum is

a.

2π∈₀R

b.

4π∈₀R

c.

4π∈₀R²

d.

4π∈₀/R

Discuss
Answer: (b).4π∈₀R
Q155.
The transition of electron from energy level W1 to W2 is associated with emission or absorption of electro magnetic radiation of frequency f such that

a.

hf = |W1 - W2|

b.

|W1 - W2|f = h

c.

hf = 0.5|W1 - W2|

d.

(hf)² = |W1 - W2|

Discuss
Answer: (a).hf = |W1 - W2|
Q156.
Even at room temperature, an intrinsic semiconductor has some holes. These holes are due to

a.

electron

b.

doping

c.

thermal energy

d.

free electrons

Discuss
Answer: (c).thermal energy
Q157.
If a capacitor C having selectivity factor Q is scaled down in all its dimensions by a factor K without any altering the dielectric material, the new capacitor will have capacitance and selectivity as

a.

C,Q/K

b.

C/K, Q

c.

C/K, Q/K

d.

C, K

Discuss
Answer: (b).C/K, Q
Q158.
The hysteresis loss is

a.

proportional to frequency

b.

independent of frequency

c.

proportional to (frequency)²

d.

proportional to 1/frequency

Discuss
Answer: (a).proportional to frequency
Q159.
Assertion (A): For a magnetic material M = (μᵣ - 1) H, where M is magnetic dipole moment/m³, H is field intensity A/m and μᵣ is relative permeability.

Reason (R): μᵣ can have any value from 0 to hundreds of thousands.

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
Q160.
As regards ∈₀ and ∈ᵣ (absolute and relative permittivity)

a.

both ∈₀ and ∈ᵣ can be interpreted in terms of atomic properties of medium

b.

only ∈ᵣ can be interpreted in terms of atomic properties of medium

c.

only ∈₀ can be interpreted in terms of atomic properties

d.

∈ᵣ has no physical significance

Discuss
Answer: (b).only ∈ᵣ can be interpreted in terms of atomic properties of medium
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