Physics: CUET Mock Test - 6 - JEE MCQ

# Physics: CUET Mock Test - 6 - JEE MCQ

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## 30 Questions MCQ Test - Physics: CUET Mock Test - 6

Physics: CUET Mock Test - 6 for JEE 2024 is part of JEE preparation. The Physics: CUET Mock Test - 6 questions and answers have been prepared according to the JEE exam syllabus.The Physics: CUET Mock Test - 6 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Physics: CUET Mock Test - 6 below.
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Physics: CUET Mock Test - 6 - Question 1

### The communication system needed for a given signal depends on which of the following?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 1

Each of the message signals has different ranges of frequencies. The type of communication system needed for a given signal depends on the bad of frequencies which are considered essential for the communication process.

Physics: CUET Mock Test - 6 - Question 2

### The frequencies for transmitting music is which of the following?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 2

The frequencies for transmitting music is which of the following?
a) Low
b) High
c) Moderate
d) Very high

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Physics: CUET Mock Test - 6 - Question 3

### Find the true statement.

Detailed Solution for Physics: CUET Mock Test - 6 - Question 3

When the bandwidth is large enough to accommodate a few harmonics, the information is not lost and the rectangular signal is more or less recovered. This is so because the higher the harmonic, the less is its contribution to the waveform. Therefore, the value of the harmonic is inversely proportional to its contribution to the waveform.

Physics: CUET Mock Test - 6 - Question 4

What is the frequency range for a speech signal?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 4

For speech signals, the frequency range of 300 Hz to 3100 Hz is considered adequate. Therefore, speech signals require a bandwidth of 2800 Hz (3100 Hz – 300 Hz) for commercial telephonic communication.

Physics: CUET Mock Test - 6 - Question 5

What is the role of SiO2 in Integrated Circuits?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 5

SiO2 acts as a diffusion mask permitting selective diffusions into the silicon wafer through the window etched into oxide. In other words, it is used for creating a protective SiO2 layer on the wafer surface of the IC. Therefore, SiO2 acts as an insulating component for integrated circuits.

Physics: CUET Mock Test - 6 - Question 6

How many types of Integrated Circuits are there?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 6

An Integrated circuit (IC) is an assembly of electronic components, fabricated as a single unit, in which miniaturized active devices and passive devices and their interconnections are built upon a thin substrate of semiconductor material. There are about 600 different types of Integrated circuits.

Physics: CUET Mock Test - 6 - Question 7

Which of the following is mainly used in the production of Integrated Circuits?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 7

Silicon is the one mainly used in the production of Integrated circuits. This is because silicon possesses many characteristics that are ideal for ICs. Silicon is used because it can be used as either an insulator or a semiconductor. This property is crucial for the manufacture of Integrated Circuits.

Physics: CUET Mock Test - 6 - Question 8

What is the maximum power rating for an IC?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 8

The maximum power rating possible for a microcircuit is 10 Watts. Integrated Circuits can’t be repaired because the individual components inside the IC are too small. As a result, the facility rating for many of the IC’s doesn’t exceed quite 10 watts. It’s impossible to manufacture high power IC’s and this is often one among the most important disadvantages of Integrated Circuits.

Physics: CUET Mock Test - 6 - Question 9

Which of the following is true regarding ICs?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 9

ICs are both small in size as well as in weight. As the fabrication process is used for the integration of active and passive components on a silicon integrated circuit, the IC becomes a lot smaller. Also, due to its small size, the weight of the IC reduces, when compared to a discrete circuit.

Physics: CUET Mock Test - 6 - Question 10

Which among the following is not easy to fabricate on an Integrated Circuit?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 10

Capacitors are not easy to fabricate on an Integrated Circuit. In fact, they are the most difficult ones to fabricate. This is because capacitors require a lot of attributes such as electromagnetic compatibility, microfabrication techniques, new magnetic materials, etc. and to integrate them, it costs a lot. Therefore, fabricating capacitors is a challenging task.

Physics: CUET Mock Test - 6 - Question 11

How many types of transistors are there?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 11

A transistor has three doped regions forming two p-n junctions between them. There are two types of transistors, namely n-p-n transistors and p-n-p transistors. In n-p-n transistors, the two segments of the n-type semiconductor are separated by a segment of p-type semiconductor, and in a p-n-p transistor, it’s just the opposite scenario.

Physics: CUET Mock Test - 6 - Question 12

Which among the following is larger compared to the other regions of a transistor?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 12

The collector is the section on the other side of the transistor that collects the charge carriers supplied by the emitter. It is moderately doped but large in size and is always kept in reverse bias with respect to the base.

Physics: CUET Mock Test - 6 - Question 13

On which of the following does base current not depend on?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 13

In an n-p-n transistor, as the base is very thin and lightly doped, a very few electrons from the emitter combine with the holes of the base, giving rise to base current and the electrons finally collected by the positive terminal of the battery gives rise to collector current. This base current is a small fraction of collector current depending on the shape of a transistor, thickness of the base, doping levels, and bias voltage.

Physics: CUET Mock Test - 6 - Question 14

The current gain of a transistor in a common emitter configuration is 50. If the emitter current is 5.5 mA, find the base current.

Detailed Solution for Physics: CUET Mock Test - 6 - Question 14

The expression for current gain is given as:
β = I/ IB
I= 50IB
Since, I= IB+IC
⇒ I= I+ 50IB
I= 51IB
I= IE51 = 5.551 = 0.107 mA

Physics: CUET Mock Test - 6 - Question 15

A transistor having α = 0.90 is used in a common base amplifier. If the load resistance is 5.0 kΩ and the dynamic resistance of the emitter junction is 50 Ω, then calculate the voltage gain.

Detailed Solution for Physics: CUET Mock Test - 6 - Question 15

The expression of voltage gain is as follows:
A= αRL / Re
Given: α = 0.90, RL = 5.0 kΩ = 5000 Ω, Re = 50 Ω
A= 0.90 × 5000 / 50
AV = 90

Physics: CUET Mock Test - 6 - Question 16

What will the power gain of a transistor if it’s α value is 0.80 and the voltage gain is 95?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 16

Power gain is defined as the ratio of output power to input power. It can also be determined as the product of current gain and voltage gain.
Given: α = 0.80, voltage gain (AV) = 95
The required equation
⇒ AP = α × AV
A= 0.80×95
A= 76

Physics: CUET Mock Test - 6 - Question 17

dentify the relationship between base current amplification (α) and emitter current amplification (β).

Detailed Solution for Physics: CUET Mock Test - 6 - Question 17

I= I+ IC
IE / IC = IB / IC + 1
1α = 1 / β + 1
α = β / 1 + β
Therefore, β = α / 1−α

Physics: CUET Mock Test - 6 - Question 18

Which of the following supplies charge carriers in a transistor?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 18

Emitter is the section or region on one side of the transistor that supplies charge carriers. It is heavily doped and is always kept forward biased with respect to the base so that it can supply a large number of charge carriers to the base.

Physics: CUET Mock Test - 6 - Question 19

What is the order of the radius of an electron orbit in a hydrogen atom?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 19

The radius of an electron orbit in a hydrogen atom is of the order of 10-11 m. It is equal to the most probable distance between the nucleus and the electron in a hydrogen atom in its ground state.

Physics: CUET Mock Test - 6 - Question 20

A hydrogen atom in its ground state absorbs 10.2 eV of energy. What is the orbital angular momentum is increased by?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 20

Increase in angular momentum = h /2π.
h /2π = 6.6 × 10−34 /2 × 3.14
h /2π = 1.05 × 10-34 Js.

Physics: CUET Mock Test - 6 - Question 21

When a hydrogen atom is in its first excited level, what is the relation of radius and Bohr radius?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 21

For the first excited level, n = 2.
r2 = (2)2r0 = 4r0.
So, when a hydrogen atom is in its first excited level, its radius is 4 times of the Bohr radius.

Physics: CUET Mock Test - 6 - Question 22

Hydrogen atoms are excited from ground state to the state of principal quantum number 4. Then, what will be the number of spectral lines observed?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 22

n = 4.
The number of spectral lines emitted = .
(4*3)/2
= 6

Physics: CUET Mock Test - 6 - Question 23

Which of the following is true regarding the Bohr model of atoms?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 23

Bohr model of atoms assumes that the angular momentum of electrons is quantized. The atom is held between the nucleus and surroundings by electrostatic forces. The other options are not valid.

Physics: CUET Mock Test - 6 - Question 24

What will be the longest wavelength in the Balmer series of hydrogen spectrum?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 24

λ = 6557 × 10-10 m.

Physics: CUET Mock Test - 6 - Question 25

The radius of the Bohr orbit depends on which of the following?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 25

The equation is given as:

From this, we can understand that rn is directly proportional to n2.

Physics: CUET Mock Test - 6 - Question 26

Which theory is confirmed by the Davisson – Germer experiment?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 26

Davisson and Germer experiment proves the concept of wave nature of matter particles. The Davisson–Germer experiment provides a critically important confirmation of the de-Broglie hypothesis, which said that particles, such as electrons, are of dual nature.

Physics: CUET Mock Test - 6 - Question 27

Which crystal is used in the Davisson – Germer experiment?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 27

The crystal used in the Davisson – Germer experiment is nickel. A fine beam of electrons is made to fall on the surface of the nickel crystal. As a result, the electrons are scattered in all directions by the atoms of the crystal.

Physics: CUET Mock Test - 6 - Question 28

Identify the expression for Bragg’s law from the following.

Detailed Solution for Physics: CUET Mock Test - 6 - Question 28

Bragg’s law is a special case of Laue diffraction, it gives the angles for coherent and incoherent scattering from a crystal lattice. The expression for Bragg’s law is given as:
2d sin⁡θ=nλ

Physics: CUET Mock Test - 6 - Question 29

Which of the following is used in the Davisson – Germer experiment?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 29

Davisson – Germer experiment uses an electron gun to produce a fine beam of electrons which can be accelerated to any desired velocity by applying a suitable voltage across the gun. The others mentioned do not find an application here.

Physics: CUET Mock Test - 6 - Question 30

Two beams, one of red light and the other of blue light, of the same intensity are incident on a metallic surface to emit photoelectrons. Which emits electrons of greater frequency?

Detailed Solution for Physics: CUET Mock Test - 6 - Question 30

From Einstein’s photoelectric equation, we have
12 mv2 = h(v – v0).
Since the frequency of blue light is greater than that of the red light, blue light emits electrons of greater kinetic energy.

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