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Physics: CUET Mock Test - 10 - CUET MCQ


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40 Questions MCQ Test CUET Mock Test Series - Physics: CUET Mock Test - 10

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Physics: CUET Mock Test - 10 - Question 1

The conductivity of P – type semiconductor is due to

Detailed Solution for Physics: CUET Mock Test - 10 - Question 1

A P-type semiconductor is formed when a trivalent electron deficient impurities such as boron group elements are doped with intrinsic semiconductor. As the impurities are electron deficient, they take electrons from the valence band creating a number of holes. Due this reason conductivity in P-type semiconductor is mainly due to holes rather than electrons.

Physics: CUET Mock Test - 10 - Question 2

In the case of metals the valence and conduction bands have

Detailed Solution for Physics: CUET Mock Test - 10 - Question 2

The materials can be classified by the energy gap between their valence band and the conduction band. The valence band is the band consisting of the valence electron, and the conduction band remains empty. Conduction takes place when an electron jumps from valence band to conduction band and the gap between these two bands is forbidden energy gap. Wider the gap between the valence and conduction bands, higher the energy it requires for shifting an electron from valence band to the conduction band.In the case of conductors, this energy gap is absent or in other words conduction band, and valence band overlaps each other. Thus, electron requires minimum energy to jump from valence band. The typical examples of conductors are Silver, Copper, and Aluminium.In insulators, this gap is vast. Therefore, it requires a significant amount of energy to shift an electron from valence to conduction band. Thus, insulators are poor conductors of electricity. Mica and Ceramic are the well-known examples of insulation material. Semiconductors, on the other hand, have an energy gap which is in between that of conductors and insulators. This gap is typically more or less 1 eV, and thus, one electron requires energy more than conductors but less than insulators for shifting valence band to conduction band.

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Physics: CUET Mock Test - 10 - Question 3

A p- type semiconductor can be obtained by adding

Detailed Solution for Physics: CUET Mock Test - 10 - Question 3

In P-type doping, boron or gallium is the dopant. Boron and gallium each have only three outer electrons. When mixed into the silicon lattice, they form "holes" in the lattice where a silicon electron has nothing to bond to. The absence of an electron creates the effect of a positive charge, hence the name P-type.Holes can conduct current. A hole happily accepts an electron from a neighbor, moving the hole over a space. P-type silicon is a good conductor.

Physics: CUET Mock Test - 10 - Question 4

Which of the following is not a semiconductor?

Detailed Solution for Physics: CUET Mock Test - 10 - Question 4

Materials that have the resistance levels between those of a conductor and an insulator are referred to as semiconductors.They are quite common, found in almost all electronic devices. Good examples of semiconductor materials are germanium, selenium, and silicon.Radium is a chemical element with symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals.

Physics: CUET Mock Test - 10 - Question 5

In a pure, or intrinsic, semiconductor, valence band holes and conduction-band electrons are always present

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

An intrinsic semiconductor, also called an undoped semiconductor or i-type semiconductor, is a pure semiconductor without any significant dopant species present. The number of charge carriers is therefore determined by the properties of the material itself instead of the amount of impurities. In intrinsic semiconductors the number of excited electrons and the number of holes are equal: n = p.

Physics: CUET Mock Test - 10 - Question 6

Doping of semiconductor is the process of

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

Doping is the process of adding impurities to intrinsic semiconductors to alter their properties. Normally Trivalent and Pentavalent elements are used to dope Silicon and Germanium. When an intrinsic semiconductor is doped with Trivalent impurity it becomes a P-Type semiconductor.

Physics: CUET Mock Test - 10 - Question 7

The number of valence electrons in a good conductor is generally

Detailed Solution for Physics: CUET Mock Test - 10 - Question 7

The electron theory states that all matter is composed of atoms and the atoms are composed of smaller particles called protons, electrons, and neutrons. The electrons orbit the nucleus which contains the protons and neutrons. It is the valence electrons that we are most concerned with in electricity. These are the electrons which are easiest to break loose from their parent atom. Normally, conductors have three or less valence electrons; insulators have five or more valence electrons; and semiconductors usually have four valence electrons.

Physics: CUET Mock Test - 10 - Question 8

When the conductivity of a semiconductor is only due to breaking of the covalent bonds, the semiconductor is called

Detailed Solution for Physics: CUET Mock Test - 10 - Question 8

A pure semiconductor is called intrinsic semiconductor, e.g., silicon, germanium. The presence of the mobile charge carriers is the intrinsic property of the material. At room temperature, some covalent bonds are broken and electrons are made free. The absence of electron in the covalent bond form hole.The electrical conduction is by means of mobile electrons and holes. Hole act as positive charge, because it can attract an electron. If some other bond is broken and the electron thus freed fills this hole(vacancy), it seems as though the hole is moving.Actually an electron is travelling in opposite direction. In a pure(intrinsic) semiconductor, the number of holes is equal to the number of free electrons.

Physics: CUET Mock Test - 10 - Question 9

For a signal to be reproduced without distortion

Detailed Solution for Physics: CUET Mock Test - 10 - Question 9

Most vibrating objects have more than one resonant frequency and those used in musical instruments typically vibrate at harmonics of the fundamental. A harmonic is defined as an integer (whole number) multiple of the fundamental frequency.

Physics: CUET Mock Test - 10 - Question 10

The three elements of a generalized communication system are

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

In communication the Transmitter helps in transmitting the signal through communication channel which acts as a physical path that connects transmitter to a receiver.And the receiver receives the transmitted signal and converts those signals in their original form.

Physics: CUET Mock Test - 10 - Question 11

Electronic communication is not possible if

Detailed Solution for Physics: CUET Mock Test - 10 - Question 11

As the information or message is transmitted from the source to the receiver ,it is first converted into electrical signal which is then transmiited through the communication medium.Hence in electrical communication it is must to convert raw message or information into electrical signal.Else the electronic messages will not be transmitted.

Physics: CUET Mock Test - 10 - Question 12

Which of these is an example of point to point communication?

Detailed Solution for Physics: CUET Mock Test - 10 - Question 12

In point to point communication,communication occurs over a link between a single transmitter and receiver.Telephony is an example of it as it needs a link between caller and receiver to transmit the information.This link is provided by various media like cable.

Physics: CUET Mock Test - 10 - Question 13

Which of these is an example of broadcast communication?

Detailed Solution for Physics: CUET Mock Test - 10 - Question 13

In broadcast mode of communication a large number of receivers are linked to a single transmiiter.Radio works as receiver which converts the transmiited information/message into the original form of the information.

Physics: CUET Mock Test - 10 - Question 14

In the magnetic meridian of a certain place, the horizontal component of the earth’s magnetic field is 0.26G and the dip angle is 60o. What is the magnetic field of the earth at this location

Detailed Solution for Physics: CUET Mock Test - 10 - Question 14

The earth's magnetic field is Be​ and its horizontal and vertical components are He​ and Hv​
cosθ= He​​/Be
∴cos60o= (​0.26×10−4​/ Be )T
⇒Be​=(​0.26×10−4)/ (½)​=0.52×10−4T=0.52G

Physics: CUET Mock Test - 10 - Question 15

hich of the following statements about magnetic field lines true?

Detailed Solution for Physics: CUET Mock Test - 10 - Question 15

Magnetic poles exist in pairs. It is not possible to isolate a north pole or a south pole. Magnetic field lines start from the north pole and go to the south pole and return to the north pole. They form continuous closed loops unlike electric lines of force which do not as an electric monopole, a single charge does exist.

Physics: CUET Mock Test - 10 - Question 16

For paramagnetic materials

Detailed Solution for Physics: CUET Mock Test - 10 - Question 16

For paramagnetic materials orbital and spin magnetic moments of the electrons are of the order of bohr magneton.
Paramagnetic materials have some unpaired electrons due to these unpaired electrons the net magnetic moment of all electrons in an atom is not added up to zero. Hence atomic dipole exists in this case. On applying external magnetic field the atomic dipole aligns in the direction of the applied external magnetic field. In this way, paramagnetic materials are feebly magnetized in the direction of the magnetizing field.

Physics: CUET Mock Test - 10 - Question 17

Which of the following features of atomic structure determine whether an element is diamagnetic or paramagnetic

Detailed Solution for Physics: CUET Mock Test - 10 - Question 17

Spin and Orbital angular momentum arise due to the presence of unpaired electrons. If there are unpaired electrons, these momenta will be there otherwise not.

Physics: CUET Mock Test - 10 - Question 18

When a magnet is being moved towards a coil, the induced emf does not depend upon

Detailed Solution for Physics: CUET Mock Test - 10 - Question 18

The magnitude of induced emf is independent of the resistance of the coil.
∴ e = −dϕ/dt = −N (d/dt) [(BA)/dt]
Thus, e depends upon N, B and A.
But induced current depends upon R.

Physics: CUET Mock Test - 10 - Question 19

In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will

Detailed Solution for Physics: CUET Mock Test - 10 - Question 19

In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will decrease.

Physics: CUET Mock Test - 10 - Question 20

A long metal bar of 30 cm length is aligned along a north south line and moves eastward at a speed of 10 ms-1. A uniform magnetic field of 4.0 T points vertically downwards. If the south end of the bar has a potential of 0V, the induced potential at the north end of the bar is

Detailed Solution for Physics: CUET Mock Test - 10 - Question 20

Induced emf = Blv = 12V. It is induced in the northward direction by right hand rule (emf=)
therefore if the south end of the pole has potential of 0V, the north end will have a potential of 12V.

Physics: CUET Mock Test - 10 - Question 21

The main reason for preferring usage of AC voltage over DC voltage

Detailed Solution for Physics: CUET Mock Test - 10 - Question 21

By using the phenomenon of mutual induction, transformers allow us to easily change voltage of AC. This is necessary to cut down poer losses while supplying electricity to our homes

Physics: CUET Mock Test - 10 - Question 22

Domestic power supply in India is

Detailed Solution for Physics: CUET Mock Test - 10 - Question 22

The voltage in India is 220 volts, alternating at 50 cycles (Hertz) per second. This is the same as, or similar to, most countries in the world including Australia, Europe and the UK. However, it's different to the 110-120 volt electricity with 60 cycles per second that's used in the United States for small appliances.

Physics: CUET Mock Test - 10 - Question 23

Phasor diagrams show

Detailed Solution for Physics: CUET Mock Test - 10 - Question 23

By convention phasor diagrams are made to show the rotation of phasor in counterclockwise direction with constant speed

Physics: CUET Mock Test - 10 - Question 24

You have a 200.0 ΩΩ resistor, a 0.400-H inductor, a 5.0 μF capacitor, and a variable frequency ac source with an amplitude of 3.00 V. You connect all four elements together to form a series circuit. Frequency at which current in the circuit is greatest and its amplitude are

Detailed Solution for Physics: CUET Mock Test - 10 - Question 24

The resistance is R=200ohm the inductor is L = 0.4 H, the capacitance is C = 5  µF and the amplitude voltage is V = CV
The frequency depends on the inductance and the capacitance and it is given by,
f= 1/ (2π√(LC))  
So, plug the values of L and C into equation 1 to get f0
f= 1/ (2π√(LC)) = 2/(2π√[0.4H)(5 x 10-6)] = 113Hz
for the current, we use ohm’s law to get the current,
I = V/R
Now, plug the values for V and R to get I
I = V/R = 3V/200Ω = 0.015A = 15mA

Physics: CUET Mock Test - 10 - Question 25

In an inductance the current

Detailed Solution for Physics: CUET Mock Test - 10 - Question 25

In an inductor, current lags behind the input voltage by a phase difference of π/2.
Current and voltage are in the same phase in the resistor whereas current leads the voltage by π/2 in a capacitor.
So, the circuit must contain an inductor only.

Physics: CUET Mock Test - 10 - Question 26

Average power supplied to a capacitor over one complete cycle

Detailed Solution for Physics: CUET Mock Test - 10 - Question 26

We know that in capacitor Current leads Voltage by 90degree. Over one complete cycle, in first quarter cycle Capacitor charges and next quarter cycle it's discharge. This will continue in next negative half cycle. So the NET POWER ABSORB IS ZERO.

Physics: CUET Mock Test - 10 - Question 27

Electromagnetic waves propagate

Detailed Solution for Physics: CUET Mock Test - 10 - Question 27

The frequency of radiation arising from the two close energy levels in hydrogen known as Lamb shift i.e. 1057 MHz is radio waves as it belongs to the short wavelength end of the electromagnetic spectrum.

Physics: CUET Mock Test - 10 - Question 28

It is necessary to use satellites for long distance TV transmission because

Detailed Solution for Physics: CUET Mock Test - 10 - Question 28
  • TV signals being of high frequency are not reflected by the ionosphere. Therefore, to reflect these signals, satellites are needed. That is why, satellites are used for long distance TV transmission.
  • Most long-distance shortwave (high frequency) radio communication—between 3 and 30 MHz—is a result of skywave propagation.
  • This 3-30 MHz is a range of frequencies which are used in sky waves propagation so that the ionosphere is capable of reflecting it.
Physics: CUET Mock Test - 10 - Question 29

Infrared waves are produced by

Detailed Solution for Physics: CUET Mock Test - 10 - Question 29
  • Infrared waves are emitted by hot bodies. They are produced due to the de-excitation of atoms.
  • They are called Heat waves as they produce heat falling on matter. This is because water molecules present in most materials readily absorb infrared waves. After absorption, their thermal motion increases, that is, they heat up and heat their surroundings.

Uses: Infra red lamps; play an important role in maintaining warmth through greenhouse effect.

Physics: CUET Mock Test - 10 - Question 30

Plane electromagnetic waves are

Detailed Solution for Physics: CUET Mock Test - 10 - Question 30

E is the electric field vector, and B is the magnetic field vector of the EM wave. For electromagnetic waves E and B are always perpendicular to each other and perpendicular to the direction of propagation. Electromagnetic waves are transverse waves. The wave number is k = 2π/λ, where λ is the wavelength of the wave.

Physics: CUET Mock Test - 10 - Question 31

Visible range of electromagnetic spectrum is

Detailed Solution for Physics: CUET Mock Test - 10 - Question 31

The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view. More simply, this range of wavelengths is called visible light. Typically, the human eye can detect wavelengths from 380 to 700 nanometers.
Option C is the closest so the answer is option C.

Physics: CUET Mock Test - 10 - Question 32

If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now?

Detailed Solution for Physics: CUET Mock Test - 10 - Question 32

The radiation of infrared rays of the sun keeps the earth's surface warm even at night due to the greenhouse effect of the atmosphere. Heavy gases likely CO2​ present in the earth's atmosphere reflect infra-red radiation back towards the earth's surface. Due to which earth's atmosphere becomes richer in infrared radiation. If the atmosphere is absent then earth temperature falls off.

Physics: CUET Mock Test - 10 - Question 33

When white light is split into its component colors by a prism

Detailed Solution for Physics: CUET Mock Test - 10 - Question 33

When white light enters the prism it has actually entered out atmosphere and so the parts of the EM spectrum like UV don't appear. After the light comes out of the prism all the parts separate but we can only see the visible part i.e. 400-700nm range. So we look at only a part of the EM spectrum. Hence option B is correct.

Physics: CUET Mock Test - 10 - Question 34

A lens of power + 2.0 D is placed in contact with another lens of power – 1.0 D. The combination will behave like

Detailed Solution for Physics: CUET Mock Test - 10 - Question 34

P = P1​ + P2 ​= +2 − 1 = +1 dioptre, lens behaves as convergent
F = 1​/P = 1/1​ = 1m = 100cm

Physics: CUET Mock Test - 10 - Question 35

Magnifying power of a compound microscope is high if

Detailed Solution for Physics: CUET Mock Test - 10 - Question 35

Magnifying power of a compound- microscope is given by m = − (l​D​/f0​fe​)
where, l is length of tube
D is least distance of clear vision
f0​ is focal length of objective
fe​ is focal length of eyepiece
So, clearly, it can be seen that focal length of objective and eyepiece needs to be decreased so that magnifying power increases.

Physics: CUET Mock Test - 10 - Question 36

Accommodation of the human eye is

Detailed Solution for Physics: CUET Mock Test - 10 - Question 36

The ability of the eye lens to adjust its focal length is called power of accommodation. This is done by the ciliary muscles by changing the focal length of the eye lens.

Physics: CUET Mock Test - 10 - Question 37

For a rectangular slab, refraction takes place at

Detailed Solution for Physics: CUET Mock Test - 10 - Question 37

The refraction takes place at both the air-glass interface and glass-air interface of a rectangular glass slab. When the light ray incident on the air-glass interface (DC) obliquely, it bends towards the normal.

Physics: CUET Mock Test - 10 - Question 38

A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen

Detailed Solution for Physics: CUET Mock Test - 10 - Question 38

The only difference in covering any part of a lens is that the intensity of the image will reduce. Since the focal length is a function of curvature of the surfaces of the lens and covering a part does not change it, the image will be formed as usual.

Physics: CUET Mock Test - 10 - Question 39

In the hydrogen atom, if the reference level of potential energy is assumed to be zero at the ground state level. Choose the incorrect statement.

Detailed Solution for Physics: CUET Mock Test - 10 - Question 39

When the electron changes levels, it decreases energy and the atom emits photons. The photon is emitted with the electron moving from a higher energy level to a lower energy level. The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level.

Physics: CUET Mock Test - 10 - Question 40

Average angle of deflection of α-particles by a thin gold foil predicted by Thomson’s model is

Detailed Solution for Physics: CUET Mock Test - 10 - Question 40

The average angle of deflection of α-particles by a thin gold foil predicted by Thomson’s model is about the same size as predicted by Rutherford’s model. This is because the average angle was taken in both models.

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