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Physics: CUET Mock Test - 5 - CUET MCQ


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40 Questions MCQ Test CUET Mock Test Series - Physics: CUET Mock Test - 5

Physics: CUET Mock Test - 5 for CUET 2024 is part of CUET Mock Test Series preparation. The Physics: CUET Mock Test - 5 questions and answers have been prepared according to the CUET exam syllabus.The Physics: CUET Mock Test - 5 MCQs are made for CUET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Physics: CUET Mock Test - 5 below.
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Physics: CUET Mock Test - 5 - Question 1

Calculate the value of peak reverse voltage (P.I.V.) if the full-wave rectifier has an alternating voltage of 300 V.

Detailed Solution for Physics: CUET Mock Test - 5 - Question 1

Given: Erms = 300 V
The required equation is → P.I.V. = 2 × E0 or P.I.V. = 2√2 × Erms
P.I.V. = 2√2 × 300 V
P.I.V. = 848.52 V ≈ 849 V.

Physics: CUET Mock Test - 5 - Question 2

What focal length should the reading spectacles have for a person for whom the least distance of distinct vision is 50 cm?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 2

By thin lens formula,
1/f = 1/v - 1/u
1/f = 1/(-50) - 1/(-25)
f = +50 cm.

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Physics: CUET Mock Test - 5 - Question 3

In Young’s double-slit experiment if the distance between two slits is halved and distance between the slits and the screen is doubled, then what will be the effect on fringe width?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 3

Original fringe width is given as → β = Dλ/d.
So, the new fringe width is → β’ = 
β’ = 4β
Therefore, the new fringe width is 4 β.

Physics: CUET Mock Test - 5 - Question 4

A lens has a focal length of 10 cm. Where the object should be placed if the image is to be 40 cm in the positive direction from the lens?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 4

Physics: CUET Mock Test - 5 - Question 5

An object is to be seen through a simple microscope of power 10 D. Where should the object be placed to reduce maximum angular magnification? The least distance for distinct vision is 25 cm.

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

Angular magnification is maximum when the final image is formed at the near point.

u = -7.1 cm.
Therefore, the object should be placed 7.1 cm before the lens to avoid angular magnification.

Physics: CUET Mock Test - 5 - Question 6

If the separation between the two slits is decreased in Young’s double-slit experiment keeping the screen position fixed, what will happen to the width of the fringe?

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

Fringe width is expressed as:
β = Dλ/d.
So, as the separation (d) between the two slits decreases, the fringe width increases. They are inversely proportional to each other.

Physics: CUET Mock Test - 5 - Question 7

What is the rms value of output current if the peak value of output current is given as 0.092 A?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 7

Given: I0 = 0.092 A
The required equation is → Irms = Io/√2
Irms = 0.092/1.414
Irms = 0.065 A

Physics: CUET Mock Test - 5 - Question 8

Find the magnification of the lens if the focal length of the lens is 10 cm and the size of the image is -30 cm.

Detailed Solution for Physics: CUET Mock Test - 5 - Question 8

Given: f = +10 cm; v = -30 cm
Required equations →
1/f = 1/v - 1/u
m = (size of the image/size of the object) = v/u
1/u = 1/v - 1/f = 1/(-30) - 1/10 = 
u = (-15)/2 = -7.5cm
m =v/u = -(30/(-7.5)) = -300/-75 = +4
Therefore, the object should be placed at a distance of 7.5 cm from the lens to get the image at a distance of 30 cm from the lens. It is four times enlarged and is erect.

Physics: CUET Mock Test - 5 - Question 9

Radioactive material decays by simultaneous emission of two particles with respective half-lives 1620 and 810 years. The time, in years, after which one-fourth of the material remains?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 9

N = N0e-(λ1 + λ2) t.
4 = e(λ1 + λ2) t.
t =  = 1080 year.

Physics: CUET Mock Test - 5 - Question 10

Why is there a sudden increase in current in Zener diode?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 10

The sudden increase in current in a Zener diode is due to the rupture of the many covalent bonds present. Therefore, the Zener diode should be connected in reverse bias.

Physics: CUET Mock Test - 5 - Question 11

What is a rectifier used for?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 11

A rectifier is based on the fact that a forward bias p-n junction conducts and a reverse bias p-n junction does not conduct electricity. The rectifier is used to convert alternating current voltage (ac) to direct current voltage (dc).

Physics: CUET Mock Test - 5 - Question 12

What is the role of SiO2 in Integrated Circuits?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 12

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 - 5 - Question 13

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

Detailed Solution for Physics: CUET Mock Test - 5 - Question 13

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 - 5 - Question 14

Identify the type of modulation where the frequency of the modulated wave is equal to that of the carrier wave.

Detailed Solution for Physics: CUET Mock Test - 5 - Question 14

In Amplitude modulation, the modulating wave is superimposed on a high-frequency carrier wave such that the amplitude of the modulated wave varies as the amplitude of the modulating wave.

Physics: CUET Mock Test - 5 - Question 15

Which of the following substances cannot be emitted by radioactive substances during their decay?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 15

Protons are not emitted by radioactive substances during their decay. They are positively charged subatomic particles found in the atomic nucleus. The others can be emitted by radioactive substances during their decay.

Physics: CUET Mock Test - 5 - Question 16

What is the semiconductor diode used as?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 16

Semiconductor diode can be used as a rectifier. The function of a rectifier is that it converts an alternating current into direct current by allowing the current to pass through in one direction.

Physics: CUET Mock Test - 5 - Question 17

How many main types of rectifiers are there?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 17

Rectifier is a device that does the process of rectification. This means that rectifiers straighten the direction of the current flowing through it. There are mainly 2 types of rectifiers, namely, full-wave rectifiers and half-wave rectifiers.

Physics: CUET Mock Test - 5 - Question 18

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

Detailed Solution for Physics: CUET Mock Test - 5 - Question 18

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 - 5 - Question 19

What is the frequency range for a speech signal?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 19

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 - 5 - Question 20

What does AGC stand for?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 20

AGC stands for automatic gain control. Automatic gain control changes (AGC) the overall gain of a receiver automatically so that the strength of the received signal remains almost constant.

Physics: CUET Mock Test - 5 - Question 21

The electron emitted in β – radiation originates from where?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 21

In β-emission, a neutron of nucleus decays into a proton and a β-particle.
The reaction given as:
0n11H2 + -1e0.

Physics: CUET Mock Test - 5 - Question 22

What is an oscillator?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 22

An oscillator is considered as an amplifier with positive feedback. It converts direct current from a power supply to an alternating current signal. It produces an alternating waveform without any input.

Physics: CUET Mock Test - 5 - Question 23

What is the ripple factor for a half-wave rectifier?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 23

For a half-wave rectifier,

r = 1.21

Physics: CUET Mock Test - 5 - Question 24

How many types of Integrated Circuits are there?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 24

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 - 5 - Question 25

The frequencies for transmitting music is which of the following?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 25

To transmit music, an approximate bandwidth of 20 kHz is required because of the high frequencies produced by the musical instruments. The audible range of frequencies extends from 20 Hz to 20 kHz.

Physics: CUET Mock Test - 5 - Question 26

Why is AM used for broadcasting in the communication systems?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 26

Amplitude modulation (AM) is used for broadcasting because it avoids receiver complexity. Moreover, only a diode and a capacitor are sufficient to separate the audio signal from the amplitude-modulated wave.

Physics: CUET Mock Test - 5 - Question 27

Find the probability that the nucleus of 87Ra221 undergoes decay after three half-lives if it’s a radioactive substance that has a half-life of 6 days.

Detailed Solution for Physics: CUET Mock Test - 5 - Question 27

After one half-life, N/2 sample remains and N/2 decays. After two half-lives, N/4 sample remains and N/4 decays out of the remaining N/2 sample. After three half-lives, N/8 sample remains and N/8 sample decays out of the remaining N/4 sample.
So, after three half-lives, in total, N/2 + N/4 + N/8 = 7N/8 decay happens. Hence, the probability that a nucleus undergoes decay after three half-lives is 7/8.

Physics: CUET Mock Test - 5 - Question 28

What is rectification?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 28

Rectification is the process of conversion of alternating current into direct current. The conversion first powers to alternating current then use a transformer to change the voltage, and finally rectifies power back to direct current.

Physics: CUET Mock Test - 5 - Question 29

A magnet can only repel another magnet. So, ‘X’ is a surer test of magnetism. Identify X.

Detailed Solution for Physics: CUET Mock Test - 5 - Question 29

A magnet can attract another magnet or a magnetic substance like iron. However, a magnet can repel another magnet only. So repulsion is the surer test of magnetism.

Physics: CUET Mock Test - 5 - Question 30

A bar magnet of the magnetic moment 5 Am2 has poles 20 cm apart. Calculate the pole strength.

Detailed Solution for Physics: CUET Mock Test - 5 - Question 30

Magnetic dipole moment = Pole strength × Magnetic length.
Pole strength = Magnetic dipole moment / Magnetic length
Pole strength = 50.2
Pole strength = 25 Am.

Physics: CUET Mock Test - 5 - Question 31

Give the SI unit of magnetic dipole moment.

Detailed Solution for Physics: CUET Mock Test - 5 - Question 31

The magnetic dipole moment of a magnetic dipole is defined as the product of its pole strength and magnetic length. The SI unit of magnetic dipole moment is ampere metre2 (Am2). Magnetic dipole moment is a vector quantity and is directed from south to north pole of the magnet.

Physics: CUET Mock Test - 5 - Question 32

Of the following which is the preferred modulation scheme for digital communication?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 32

Pulse code modulation is the one preferred for digital communication. Pulse codes are used to convert an analog signal to a digital one. It is the standard form of digital audio in computers, compact discs, etc.

Physics: CUET Mock Test - 5 - Question 33

A 300-day old radioactive substance shows an activity of 5000 dps, 150 days later its activity becomes 2500 dps. What was its initial activity?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 33

The expression is given as:
R0 = 4R
4R = 4 × 5000
R0 = 20000dps.

Physics: CUET Mock Test - 5 - Question 34

What is a Zener diode used as?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 34

Zener diode can be used as a voltage regulator. They can also be used as shunt regulators to regulate the voltage across small circuits. Zener diodes are always operated in a reverse-biased condition.

Physics: CUET Mock Test - 5 - Question 35

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

Detailed Solution for Physics: CUET Mock Test - 5 - Question 35

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 - 5 - Question 36

Find the true statement.

Detailed Solution for Physics: CUET Mock Test - 5 - Question 36

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 - 5 - Question 37

A carrier of peak voltage 15 V is used to transmit a message signal. If the modulation index is 70%, then what will be the peak voltage of the modulating signal?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 37

μ = Am/Ac.
Am = μ × Ac.
Am = (70/100) x 15V
Am =10.5 V.

Physics: CUET Mock Test - 5 - Question 38

Identify the direction in which a thin long piece of magnet comes to rest when suspended freely.

Physics: CUET Mock Test - 5 - Question 39

A magnetized needle of the magnetic moment 20 JT-1 is placed at 60o with the direction of the uniform magnetic field of magnitude 9 T. What is the torque acting on the needle?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 39

Torque, τ = mBsin (θ).
Given: m = 20 J/T; B =9 T; θ = 60o
τ = 20 JT-1 × 9 T × sin(60o)
τ = 155.8J.

Physics: CUET Mock Test - 5 - Question 40

What is the form factor for a full-wave rectifier?

Detailed Solution for Physics: CUET Mock Test - 5 - Question 40

For a full-wave rectifier,

Form factor = Irms/Idc
Form factor = 
Form factor =  1.11

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