CBSE Class 12 Physics Quiz Test

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Matt Balanda, a Calvary Chapel Christian School leader with a Bachelor's in Aerospace Engineering and Mathematics, transitioned from Aerospace Engineering to Education with a Master's from California Baptist University. As the High School Vice-Principal and Physics teacher, he nurtures students' love of learning and faith, creating an enriching and transformational educational experience.
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1. Two field lines can never cross each other.

Explanation

"If they did, the field at the point of intersection will not have a
unique direction, which is absurd."

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About This Quiz
CBSE Class 12 Physics Quiz Test - Quiz

.
Prepare for success in your Class 12 Physics exam with our interactive quiz! Test your knowledge on key topics, from electromagnetism to quantum mechanics. Our quiz is... see moredesigned to reinforce your understanding of fundamental principles, equations, and concepts crucial for Class 12 Physics. Whether you're reviewing for an upcoming test or aiming for top scores, our quiz provides a challenging and insightful way to assess your proficiency. Dive into the world of physics, tackle questions with confidence, and track your progress. Elevate your learning experience with our Class 12 Physics Quiz – the perfect tool to enhance your exam readiness! see less

2. The angle of incidence corresponding to an angle of refraction ---------, is called the critical angle.

Explanation

from Snell’s law

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3. T denotes_________

Explanation

SI unit .

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4. Do electromagnetic waves carry energy and momentum like other waves?

Explanation

Electromagnetic waves do carry energy and momentum like other waves. This is supported by the fact that electromagnetic waves can exert pressure on objects, such as in the case of solar sails, where the momentum of photons is transferred to the sail, causing it to move. Additionally, the energy carried by electromagnetic waves can be harnessed and used in various applications, such as in the form of light for illumination or radio waves for communication. Therefore, it can be concluded that electromagnetic waves possess both energy and momentum.

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5. Give example of communication systems  

Explanation

"Television broadcast, microwave links and satellite communication
are some examples of communication systems that use space wave mode of propagation."

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6. The explanation of the hydrogen atom spectrum provided by Bohr's model

Explanation

The explanation of the hydrogen atom spectrum provided by Bohr’s model.

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7. Light is an ------------ wave.

Explanation

Maxwell equation led to the remarkable conclusion that light is an electromagnetic wave.

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8. Maxwell's displacement current also called as electric displacement current.

Explanation

Maxwell's displacement current is also referred to as electric displacement current. This concept was introduced by James Clerk Maxwell to modify Ampère's law and incorporate the changing electric field in the region between the plates of a charging capacitor.

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9. "In amplitude modulation the amplitude of the carrier is varied in accordance with the information signal."  

Explanation

Since it is AMPLITUDE MODULATION

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10. Radiation has dual nature

Explanation

Radiation has dual nature: wave and particle.

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11. Communication is the act of transmission of--------------  

Explanation

Communication is the act of transmission of information (can be any signal).

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12. An oscillating charge is an example of accelerating charge.

Explanation

Statement

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13. Sir Arthur Conan Doyle,the creator of the famous detective Sherlock Holmes

Explanation

Sir Arthur Conan Doyle (the creator of the famous detective Sherlock Holmes)

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14. A particle is moving in a circular path of radius r. The displacement after half a circle would be:

Explanation

Displacement is the shortest distance between the initial and final positions of a particle. After completing half a circle, the particle's final position is diametrically opposite to its initial position. Therefore, the displacement is equal to the diameter of the circle, which is 2r.

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15. At equilibrium, the rate of generation is equal to the rate of recombination of charge carriers.  

Explanation

At equilibrium, the rate of generation is equal to the rate of recombination of charge carriers. This means that the number of charge carriers being created (generation) is balanced by the number of charge carriers being lost (recombination). In other words, there is a continuous process of charge carriers being created and then recombining, resulting in a stable equilibrium where the rates of generation and recombination are equal.

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16. The difference is often called the ________ of the circuit

Explanation

In electrical circuits utilizing frequency modulation (FM), the term "frequency deviation" pertains to the variation in frequency from a fixed central frequency or carrier signal. It represents the extent to which the carrier frequency is altered due to modulation by an input signal. For instance, in FM radio broadcasting, the audio signal modulates the carrier frequency, and the magnitude of frequency deviation corresponds to the amplitude of the audio signal, thereby affecting the quality of the transmitted sound. In essence, frequency deviation quantifies how far the carrier frequency strays from its central value, a crucial parameter in FM systems that helps convey information encoded within the signal, such as audio or data.

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17. The important digital circuits performing special logic operations are called --------------gates.  

Explanation

The important digital circuits performing special logic operations are called logic gates. These are: OR, AND, NOT, NAND, and NOR gates.

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18. _______________ offer resistance to the movement of charges which is intermediate between the conductors and insulators.

Explanation

They have temperature dependent charactertics

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19. The charge q, which tests the effect of a source charge, is called___________

Explanation

The source charge Q must remain at its original location

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20. Emf is __________

Explanation

General abbrevation

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21. The unit of Magnetic Flux Is-----------

Explanation

based on the units

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22.  ----------and-----------  bands appear on the screen are called fringes.

Explanation

Due to monocolor nature of fringes

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23. Two large plane parallel conducting plates separated by a small distance.

Explanation

A parallel plate capacitor consists of two large plane parallel conducting plates.

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24. Kirchhoff's rules

Explanation

Termed as junction & loop rule.

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25. Voltage that varies like a sine function with time, is called

Explanation

Such a voltage is called alternating voltage (ac voltage)

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26. From Maxwell's equations that electric and magnetic fields in an electromagnetic wave are ------- to each other

Explanation

nature of electromagnetic waves

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27. An external input is necessary to sustain ac signal in the output for an -------------  

Explanation

In an amplifier, a sinusoidal input is given which appears as an amplified signal in the output. This means that an external input is necessary to sustain ac signal in theoutput for an amplifier.

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28. The centres of positive charges and of negative charges lie at the same place,their dipole moment is -----------.

Explanation

In most molecules, the centres of positive charges and of negative charges lie at the same place. Therefore, their dipole moment is zero.

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29. In a non-polar molecule, the centres of positive and negative charges coincide.

Explanation

Nature of non-polar molecules.

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30. The frequency of the incident light was smaller than a certain minimum value, called the____________ frequency.

Explanation

Generally termed as Threshold Frequency

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31. The collisions of the electrons occur at regular intervals

Explanation

"since, the direction of the velocity of an electron is completely
random."

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32. Relaxation time is denoted using---------

Explanation

Standard denotion.

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33. __________= 1V/A 

Explanation

unit of resistance.

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34. The algebraic sum of changes in potential around any closed loop must be-----

Explanation

based on loop rule.

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35. In Rutherford's nuclear model of the atom, the entire ------ charge and most of the mass of the atom are concentrated in the nucleus with the electrons some distance away.

Explanation

only positive

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36. Lenz's law states When a current in a coil changes, it induces a back emf in the same coil.

Explanation

When a current in a coil changes, it induces a back emf in the same coil.

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37. The basic unit of length is harder to define as accurately in a direct way.

Explanation

The statement suggests that it is more challenging to define the basic unit of length accurately in a direct manner. This implies that there may be certain complexities or limitations in directly determining the exact measurement of length. Therefore, the answer "TRUE" indicates that the statement is correct in stating that the basic unit of length is harder to define accurately in a direct way.

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38. Electric field is a --------------field, since force is a------------ quantity

Explanation

"The term field in physics generally refers to a quantity that is
defined at every point in space and may vary from point to point."

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39. The phenomena of -----------was/were explained in a natural and satisfactory way by the wave picture of light.

Explanation

The phenomena of interference, diffraction and polarisation were explained in a natural and satisfactory way by the wave picture of light.

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40. The Bohr model is applicable to ----------- atoms.

Explanation

The explanation of the hydrogen atom spectrum provided by Bohr’s model.

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41. What are the waves used in radio and television communication system?

Explanation

radio waves are used in radio and television communication systems.

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42. ∆s Denotes---------

Explanation

According to physical quantity it denotes vector area element

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43. If the sizes of charged bodies are very small as compared to the distance between time, call as________

Explanation

we treat them as point charges.

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44. The voltage and current are ---------- with each other.

Explanation

Inphase to each other.

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45. Odd one out  

Explanation

Rest of them are analogue signals.

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46. The polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it.

Explanation

Lenz's law statement.

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47. Another phrase commonly used means potential difference between two points?

Explanation

potential difference between two points also known as voltage.

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48. VECC is------

Explanation

Since the variable energy cyclotron was build in VECC, kolkata.

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49. Which one of the following is compound semiconductors?

Explanation

Both Cd (Cadmium) and Si (Silicon) are examples of compound semiconductors. Compound semiconductors are composed of two or more elements, and in the case of Cd, they form compounds with other elements to create semiconductor materials. Silicon, although a group IV element, can also be part of compound semiconductors when combined with elements from other groups, creating various types of semiconducting materials.

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50. The energy required to take out an electron from the atom is called----  

Explanation

Ionization energy is the amount of energy needed to remove an electron from an atom, converting it into a positively charged ion. It is typically expressed in terms of energy per mole of atoms and is often measured in electron volts (eV) or kilojoules per mole (kJ/mol).

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51. Ammeter is used to measure ----------.  

Explanation

All denotes various unit of current

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52. Coulomb force and gravitational force follow the same ----------

Explanation

Coulomb force and gravitational force follow the same inverse-square law

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53. Which one of these is used to measure internel resitance of a cell 

Explanation

For this the cell (emf e ) whose internal resistance (r) is to be determined isconnected across a resistance box through a key K2.

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54. Mass number equal to---------------

Explanation

number of protons+number of neutrons

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55. Coherently illuminated single slit usually called the -------diffraction pattern.

Explanation

normally known another name.

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56. It is also possible that emf is induced in a single isolated coil due to change of flux through the coil by means of varying the current through the same coil.

Explanation

This is the phenomenon of self-induction.

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57. Ampere's circuital law holds for----------

Explanation

According to ampere circuital alw

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58. When fusion is achieved by raising the temperature of the system so that particles have enough kinetic energy to overcome the coulomb repulsive behaviour, it is called ________.  

Explanation

The generalised term used hence it is "B"

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59. _________nuclides with same mass number A are called isobars

Explanation

All nuclides with same mass number A are called isobars

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60. The speed of light is _____________ and _______________

Explanation

since speed and direction can be determined

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61. What processes the incoming message signal so as to make it suitable for transmission through a channel and subsequent reception  

Explanation

Basic definition of Transmitter

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62. I/A, is called --------

Explanation

j= I/A (i.e) current density

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63. Does a bar magner exert a torque on itself due to its own field?

Explanation

There is no force or torque on an element due the field produced by the element itself.

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64. The two displacements are now out of phase and the two displacements will cancel out to give zero intensity. This is referred to as -------------.

Explanation

since the two displacements will cancel out to give zero intensity. This is referred to as destructive interference.

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65. The net----------- through any closed surface is 0

Explanation

based on gauss law.

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66. AC generator is based on the  phenomenon of -----------

Explanation

principle of AC generator.

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67. Current is a Vector Quantity

Explanation

Current is a scalar although we represent current with an arrow.

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68. Isotope means the same place

Explanation

In Greek,isotope means the same place

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69. Locus of points, which oscillate in phase is called a -------------

Explanation

based on HUYGENS PRINCIPLE

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70. Each quantum of radiant energy has energy hv, where h is-----------.

Explanation

Each quantum of radiant energy has energy hv, where h is Planck’s constant and n the frequency of light.

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71. Two important processes occur during the formation of a p-n junction:--------  and -----------  

Explanation

Two processes namely diffusion and drift

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72. The name electricity is coined from the Greek word __________meaning amber

Explanation

Elektron is a greek word that coins electricity

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73. A gram of water contains approximately 10^22 ------------

Explanation

Bulk matter is made up of many molecules.

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74. The pole near the geographic north pole of eath is called the -------

Explanation

The pole near the geographic north pole of the earth is called the north magnetic pole. This is because the north magnetic pole is the point on the earth's surface where the magnetic field lines are directed vertically downwards, indicating the direction towards the earth's magnetic north pole. This is different from the geographic north pole, which is the point on the earth's surface that lies at the northernmost point of the earth's axis of rotation. Therefore, the correct answer is north magnetic pole.

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75.
silver is a ---------conductor

Explanation

silver consists of homogeneous molecules.

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76. The cyclotron uses----------- to increase the energy of charged particles.

Explanation

both electric and magnetic fields in combination is used to increase the energy of charged particles.

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77. Marie Sklodowska Curie  

Explanation

She is a physicist and as a chemist.

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78. Parallel currents repel, and anti-parallel currents attract.

Explanation

In electromagnetism, parallel currents flowing in the same direction create magnetic fields that interact in a way that results in an attractive force between the conductors. Conversely, anti-parallel currents flowing in opposite directions generate magnetic fields that interact to produce a repulsive force between the conductors. This behavior is described by the right-hand rule for the magnetic field around a current-carrying conductor. I appreciate your understanding and patience.

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79. The current carried by conductors due to flow of charges is called ----------- current.

Explanation

The current carried by conductors due to flow of charges is called conduction current.

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80. The process of addition of a desirable impurity to a semiconductor is called dopant  

Explanation

The process of adding a desirable impurity to a semiconductor is indeed called doping. Dopants are intentionally introduced into a semiconductor material to modify its electrical properties. Depending on the type of dopant added, the semiconductor can become either n-type or p-type. 

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81. Can we take one slab of p-type semiconductor and physically join it to another n-type semiconductor to get p-n junction?  

Explanation

"No! Any slab, howsoever flat, will have roughness much larger than the inter-atomic crystal spacing and hence continuous ontact at the atomic level will not be possible. The junction
will behave as a discontinuity for the flowing charge carriers."

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82. Light of shorter wavelengths is scattered much less than light of longer wavelengths

Explanation

Light of shorter wavelengths is scattered much more than light of longer wavelengths

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83. Which is typically the order of magnitude of currents in domestic appliances?

Explanation

An ampere is defined through magnetic effects of currents

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84. In Biot-Savart's law the relation between --------- and ------- field it produces.

Explanation

based on biot savart law's statement

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85. WWW was invented by the ----------------

Explanation

Tim Berners-Lee invented the World Wide Web.

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86. A plane perpendicular to the dipole axis through its centre.

Explanation

The equatorial plane of the dipole,i.e., on a plane perpendicular to the dipole axis through its centre.

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87. Young's double slit of separation ----- gives equally spaced fringes of angular separation------- .

Explanation

since,The source, mid-point of the slits, and central bright fringe lie in a straight line.

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88. =      This relation is known as______

Explanation

By applying sign convention in refraction by a lens

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89. The magnitude of the induced emf in a circuit is equal to the time rate of change of magnetic flux through the circuit.

Explanation

based on faraday's law of electromagnetic induction

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90. The ------------ and its balance condition provide a practical method for determination of an unknown resistance

Explanation

It only uses balance condition to find the resistance

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91. Which of these potentials are same?

Explanation

Negative and retarding indicates decreasing

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92. Electromagnetic damping related to

Explanation

Application of eddy current

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93. In ---------- model, an atom is a spherical cloud of positive charges with electrons embedded in it

Explanation

based on Thomson’s theory

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94. The radius of the circular component of motion is called the radius of the -------.

Explanation

Due to generic motion

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95. Light energy is concentrated in tiny particles called _________

Explanation

Spelled correctly

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96. The ray from the point which is parallel to the principal axis. The reflected ray goes through the ___ of the mirror. 

Explanation

Charactersitcs of the wave

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97. The lens does not introduce any extra path differences in a perpendicular beam

Explanation

The lens does not introduce any extra path differences in a parallel beam.

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98. LtR=        Voltage applied to a__________

Explanation

According to AC voltage drived from kirchhoff's loop rule.

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99. Hertz observed that high voltage sparks across the ____ loop were enhanced when the emitter plate was illuminated by ultraviolet light from an arc lamp.

Explanation

since it is spelled correctly as coined by Hertz.

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100. A current or a field (electric or magnetic) emerging out of the plane of the paper is depicted by -----

Explanation

According dot rule.

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101. The secondary of the transformer is provided with a centre tapping and so it is called -------------- transformer.  

Explanation

since, tappings are find at the center of the transformer's secondary.

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102. Transverse elastic wave meant --------

Explanation

"Transverse elastic (sound) waves can also propagate
in a solid, which is rigid and that resists shear."

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103. For paraxial rays tanø=ø, now tan(n-1)ø=? Consider ø is small

Explanation

since, tanø=ø then tan(n-1)ø=nø-ø

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104. The picture of field lines was invented by Faraday,called---------

Explanation

"The picture of field lines was invented by Faraday to develop an
intuitive non- mathematical way of visualizing electric fields around charged configurations. Faraday called them lines of force."

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105. Give an example of a material exhibiting behaviour such as relation between V and I is not unique

Explanation

In GaAs,there is more than one value of V for the same current I

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106. Another name of Rutherford's planetary model is ----------

Explanation

he named as the nuclear model of the atom.

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107. The modern ac generator with a typical output capacity of ------ is a highly evolved machine.

Explanation

The modern ac generator with a typical output capacity of 100 MW is a highly evolved machine.

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108. A well-known example of alpha decay is the decay of uranium (? ,?) to thorium (A=234 ,Z=90 )  

Explanation

only the selected combination exists.

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109. The electric field inside the plates of the capacitor is directed ------- to the plates.

Explanation

nature of fields

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110. Linear Charge density is --,surface Charge density is --,volume Charge density is --.

Explanation

conventional symbols

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111. Which exhibit a very weak dependence of resistivity with temperature?

Explanation

which is an alloy of nickel, iron and chromium.

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112. The angle between the true geographic north and the north shown by a compass needle.

Explanation

The angle between them is called magentic declination or simply declination.

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113. Which band consist of 4N energy states?  

Explanation

The band consisting of 4N energy states,called the conduction band, is completely empty at absolute zero.

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114. The space-charge region on either side of the junction together is known as ------------- region  

Explanation

space-charge region on either side of the junction together is known as depletion region as the electrons and holes taking part in the initial movement across the junction depleted the region of its free charges

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115. A portion of the output power is returned back to the input in phase with the starting power -----------  

Explanation

"A portion of the output power is returned back (feedback)
to the input in phase with the starting power (this process is termed positive feedback)"

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116. Sound waves in air are latitudinal waves of compression and rarefaction.

Explanation

Sound waves in air are longitudinal waves of compression and rarefaction.

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117. Diffraction is a general characteristic exhibited by -----------

Explanation

"Diffraction is a general characteristic exhibited by all types of
waves, be it sound waves, light waves, water waves or matter waves"

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118. The number of photoelectrons emitted per second is directly proportional to the intensity of ______.

Explanation

The photocurrent is directly proportional to the number of photoelectrons emitted per second. This implies that the number of photoelectrons emitted per second is directly proportional to the intensity of incident radiation.

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119. Kirchhoff's --------- is based on conservation of charge

Explanation

since Bending or reorienting the wire does not change the validity of Kirchhoff’s junction rule.

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120. A set of equations involving magnetic field, and their sources, the charge and current densities are known as Maxwell's equations.

Explanation

Maxwell formulated a set of equations involves both electric and magnetic fields,

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121. Which band is completely empty at absolute zero?  

Explanation

The band consisting of 4N energy states,called the conduction band, is completely empty at absolute zero.

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122. Maxwell showed,a changing electric field must also produce a magnetic flux.

Explanation

Maxwell showed that for logical consistency, a changing electric field must also produce a magnetic field.

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123. Electromagnetic waves are ---- of electric and magnetic fields in free space, or vacuum.

Explanation

Electromagnetic waves are self-sustaining oscillations of electric and magnetic fields in free space, or vacuum. This means that the electric and magnetic fields are able to propagate through space without the need for any external source of energy or support. The term "self-sustaining" implies that the oscillations can continue indefinitely without any external input.

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124. The reflected rays converge at a point F on the _______ of a concave mirror

Explanation

Due to the concave nature of the mirror

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125. What allows transfer of files/software from one computer to another connected to the Internet?  

Explanation

FTP (File Transfer Programmes)

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126. In -------- and---------,  light energy is redistributed

Explanation

based on single slit diffraction pattern.

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127. The notion of continuous charge distribution is similar to continuous -------------distribution in mechanics  

Explanation

we adopt for continuous mass distribution in mechanics

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128. For a frequency  of incident radiation, lower than the cut-off frequency, no photoelectric emission is possible even if the intensity is ------------.

Explanation

Based on the observation of Effect of frequency of incident radiation on stopping potential

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129. An electron in an atom could revolve in certain stable orbits without the emission of radiant energy

Explanation

According to his postulate.

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130. Root Mean Square is also called -----------

Explanation

RMS Is also called effective current.

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131. Frequencies in the UHF range normally propagate by means of:  

Explanation

Frequency bands UHF174-216 MHz

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132. Which of the following is debroglie wavelength?

Explanation

The wavelength λ of the matter wave is called de Broglie wavelength

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133. "A TV signal contains both voice and picture and is usually allocated 16 MHz of bandwidth for transmission."  

Explanation

"A TV signal contains both voice and picture and is usually
allocated 6 MHz of bandwidth for transmission."

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134. Power of a lens is a measure of the------------

Explanation

Definition of power of lens

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135. Frequency band of Satellite Communication is ---------------------  

Explanation

Frequency band of Satellite Communication

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136. Magetic field  lines show the direction (at every point) along which a small magnetised needle aligns (at the point). Do the magnet field lines also represent the lines of force on a moving charged particle at every point?

Explanation

The magnet force is always normal to B.

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137. The de Broglie hypothesis has been basic to the development of modern -----------------

Explanation

The de Broglie hypothesis has been basic to the development of modern quantum mechanics. It has also led to the field of electron optics

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138. Minimum energy required by an electron to escape from the metal surface is called the ________ of the metal.

Explanation

Minimum Energy denotes Work function.

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139.

Explanation

denotes impedance.

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140. The solution of the Schrödinger wave equation, obtained for hydrogen-like atoms/ ions, called the wave function, gives  nformation about the probability of finding an electron in various regions around the nucleus. This ---- has no resemblance whatsoever with the ---------- defined for an electron in the Bohr model.

Explanation

ORBIT VS STATE OF ELECTRON IN ATOM

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141. Photons are electrically ------------ and are ----------- by electric and magnetic fields.

Explanation

based on the characteristics of photon picture of electromagnteic radiation.

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142. The total current passing through any surface of which the closed loop is the perimeter. This generalized law is known as-------

Explanation

The statement describes the Ampère-Maxwell law, a generalization of Ampère's Law. The Ampère-Maxwell law includes the displacement current term, which James Clerk Maxwell added to Ampère's Law to make the equation consistent with the principle of conservation of charge. This law is a fundamental equation in electromagnetism that describes how magnetic fields are generated both by electric currents and by changing electric fields.

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143. The energy associated with thepropagating wave comes at the expense of the energy of the source – theaccelerated wave.

Explanation

The energy associated with the propagating wave comes at the expense of the energy of the source – the accelerated charge.

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144. How many basic modes of communication are there?  

Explanation

There are two basic modes of communication: point-to-point and broadcast

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145. When the antenna is turned ------- the signal will be greatly diminished.

Explanation

The signal will be greatly diminished,When the antenna is turned horizontal.

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146. The idea of FAX transmission was patented by Alexander Bain in -----------.  

Explanation

Historical event

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147. The volume charge density also called as -----------

Explanation

sometimes simply called charge density

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148. The resembalance of magnertic field lines for abar magnet and a ------------- suggest that a bar magnet may be thought of as a large number of circulating current in analogy with a ----------.         HINT:bar magnet as an equalent solenoid.

Explanation

bar magnet as an equalent solenoid.

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149. Energy greater than the ---------- required for electron emission from the metal surface can be supplied by suitably heating or applying strong electric field or irradiating it by light of suitable frequency

Explanation

The minimum energy needed by an electron to come out from a metal surface is called the work function of the metal

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150. Meissner effect, diamagnetism in --------------

Explanation

The Meissner effect is a phenomenon observed in superconductors, where they exhibit perfect diamagnetism, meaning they repel magnetic fields. This effect occurs when a superconductor is cooled below its critical temperature and becomes a perfect conductor of electricity. In contrast, semiconductors, conductors, and dielectrics do not exhibit the Meissner effect or perfect diamagnetism. Therefore, the correct answer is superconductors.

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151. First model of atom (by J.J.Thomson )was picturesquely called-------- of the atom.

Explanation

he named his model as plum pudding model.

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152. The existence of discrete energy levels in an atom was directly verified in 1914 by ---------- and ---------.

Explanation

correct order of their names.

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153. The SI unit for activity is becquerel, named after the discoverer of radioactivity.  

Explanation

his name is , A.Henry Becquerel or , A.H. Becquerel

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154. The phasors V and I ( for resistor) are in same phase. This mean that the phase angle is --------

Explanation

That the phase angle between the voltage and the current is zero.

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155. CRT used in television and computer monitors, which work on the principle of vacuum tubes, are being replaced by LCD monitors with supporting Liquid-state electronics.

Explanation

Cathode Ray Tubes (CRT) used in television and computer monitors, which work on the principle of vacuum tubes, are being replaced by Liquid Crystal Display (LCD) monitors with supporting solid-state electronics.

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156. The basic unit of time can be defined very accurately in terms of some ----------

Explanation

frequency of light emitted by an atom in a particular process.

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157. Frequency band for cellulor mobile radio(base station to mobile)  

Explanation

based on the frequency bands standard bandwidth.

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158. Which of the following frequencies will be suitable for beyond-thehorizon communication using sky waves?  

Explanation

"10 kHz cannot be radiated (antenna size), 1 GHz and 1000 GHz
will penetrate."

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159. A basic law regarding flow of currents was discovered by------------in 1828, long before the physical mechanism responsible for flow of currentswas discovered.

Explanation

based on ohm's bibliography

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160. By applying a very strong electric field to a metal, electrons can be pulled out of the metal, as in a spark plug.

Explanation

Definition of Field emission.

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161. Davisson-Germer's photoelectric equation is in accordance with the energy conservation law as applied to the photon absorption by an electron in the metal.

Explanation

Einstein’s photoelectric equation is in accordance with the energy conservation law as applied to the photon absorption by an electron in the metal.

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162. A photocell is a technological application of the photoelectric electrons.

Explanation

A photocell is a technological application of the photoelectric effect.

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163. In cyclotron, as the fields are perpendicular to each other are called ------------

Explanation

There are generally called as crossed fields.

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164. What is the phenomenon where light bends around the edge of an obstacle or through a slit, resulting in patterns of light and dark bands?

Explanation

Diffraction occurs when waves encounter an obstacle or a slit that is comparable in size to their wavelength. For light, this leads to bending around the edges and the formation of a pattern of interference bands. Diffraction is distinct from refraction, which involves the bending of light as it passes from one medium to another, and polarization, which is related to the orientation of light waves. Diffraction is fundamental in explaining behaviors of waves that cannot be accounted for by geometrical optics alone.

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165. Which is used for detecting optical signals?  

Explanation

Photodiodes used for detecting optical signal (photodetectors).

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166. Coulomb used a torsion balance. A torsion balance is a sensitive device to measure ________.

Explanation

Coulomb used torsion balance only for measuring the force between two charged metallic spheres

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167. "The electric field due to a charge configuration with total charge zero is not zero; but for distances large compared to the size of the configuration, its field falls off faster than 1/r2, typical of field due to a single charge".Give example for above fact.

Explanation

An electric dipole is the simplest example

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168. The magnet field lines gives us an approximate idea of the magnetic field B.

Explanation

A dipole in an uniform magnetic field.

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169. Millikan's ---------- precise measurements confirmed the Einstein's photoelectric equation and obtained an accurate value of Planck's constant h

Explanation

confirmed at his first experiment.

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170. The phenomenon of resonance is common among systems that have a tendency to oscillate at a particular frequency.

Explanation

This frequency is called the system’s natural frequency

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171. The atomic energy programme in India was launched around the time of independence under the leadership of Homi G. Bhabha  

Explanation

His name is Homi J. Bhabha

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172. An electromagnetic wave also exerts -------

Explanation

Since it carries momentum, an electromagnetic wave also exerts pressure,called radiation pressure.

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173. IF is --------------- than the carrier frequency  

Explanation

The carrier frequency is usually changed to a lower frequency by what is called an intermediate frequency (IF)

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174. The degree of _____________ is an indicator of the amount of charge.

Explanation

When a charged object touches the metal knob at the top of the rod, charge flows on to the leaves and they

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175. Externel field: torque (in-terms of electrostatics)---------,externel field:energy(in-terms of magnetism)------.

Explanation

By use of dipole analogy.

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176. The dimension of --------- reactance is the same as that of resistance

Explanation

The dimension of capacitive reactance is the same as that of resistance and its SI unit is ohm.

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177. Approximate height of  Mesosphere over earth's surface is 

Explanation

It lies between the range of 50-85km i.e. 31-53 miles.

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178. The sun is -----------.This means the electric vector takes all possible directions in the transverse plane, rapidly and randomly, during a measurement.

Explanation

since it is a natural light.

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179. The cathode rays were discovered, in 1870, by ____ who later, in 1879, suggested that these rays consisted of streams of fast moving negatively charged particles.

Explanation

correctness of author name is selected.

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180. State Ohmic loss

Explanation

Using ohm's law P=I^2 x R

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181. Television uses the --------- to generate the magnetic fields needed.

Explanation

Television only uses solenoid.

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182. Which is the process of recovering the modulating signal from an amplitude modulated  waveform, is carried out using a rectifier and an envelope detector?  

Explanation

AM detection, which is the process of recovering the modulating signal from an AM waveform, is carried out using a rectifier and an envelope detector.

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183. The field of the electric dipole is--------

Explanation

The total charge of the electric dipole is obviously zero. This does notmean that the field of the electric dipole is zero

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184. What cable is a widely used wire medium, which offers a bandwidth of approximately 750 MHz?  

Explanation

Because Coaxial cables are normally operated below 18 GHz.

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185. Even when bulk pieces of conductors are subjected to changing magnetic flux,  --------- are produced in them

Explanation

from EDDY CURRENTS statement

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186. The wave nature of electrons was first experimentally verified by --------------- and ------------- in 1927 and independently by ------------, in 1928, who observed diffraction effects with beam of electrons scattered by crystals

Explanation

The wave nature of electrons was first experimentally verified by C.J.Davisson and L.H. Germer in 1927 and independently by G.P. Thomson, in 1928, who observeddiffraction effects with beams of electrons scattered by crystals.

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187. The ----------- is much weaker than even --------------.  

Explanation

The gravitational force is much weaker than even Coulomb force.

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188. Insulators have:

Explanation

They have high resistivity (or low conductivity). Some of the examples of insulators are rubber, glass, graphite, plastics, etc. 

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189. Which type of  wave propagation  is used by short wave broadcast services?  

Explanation

sky wave propagation is used by short wave broadcast services.

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190. Astronomers call the increase in wavelength due to doppler effect as -----------

Explanation

Astronomers call the increase in wavelength due to doppler effect as red shift since a wavelength in the middle of the visible region of the spectrum moves towards the red end of the spectrum.

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191. Who built the first point-contact transistor? (check all that apply)

Explanation

The inventors are J. Bardeen and W.H. Brattain of Bell Telephone Laboratories, U.S.A.

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192. Which type of  wave propagation  is used for satellite communication?  

Explanation

"Space waves are used for line-of-sight (LOS) communication as
well as satellite communication"

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193. The self-inductance plays the role of ----------

Explanation

Physically, the self-inductance plays the role of inertia. It is the electromagnetic analogue of mass in mechanics.

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194. According to  amperain loop, B is -----------

Explanation

based on assumption made in amperian loop B is tangetial or normal or vanish.

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195. Which is not pulse modulation type  

Explanation

Pulse Amplitude Modulation (PAM), Pulse Frequency Modulation (PFM), and Pulse Position Modulation (PPM) are all recognized forms of pulse modulation used in communication systems and signal processing.

Pulse Density Modulation (PDM) is a type of modulation where the relative density of pulses corresponds to the analog signal's amplitude. It is commonly used in digital audio applications, particularly in converting analog signals to digital form. While it shares similarities with other pulse modulation techniques, it is not as widely recognized or used in general communication systems compared to PAM, PFM, and PPM. Therefore, PDM is not typically considered a common type of pulse modulation.

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196. Superposition principle,there are ----additional three-body, four-body, etc., forces which arise only when there are more than two charges

Explanation

Based on Superposition principle.

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197. "The binding energy per nucleon is a constant and is approximately equal to ------"  

Explanation

"Since most of the nucleons in a large nucleus reside inside it
and not on the surface, the change in binding energy per nucleon would be small."

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198. "The ---------- picture elegantly incorporated the Heisenberg's uncertainty principle."  

Explanation

The matter–wave picture elegantly incorporated the Heisenberg’s uncertainty principle.

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199. State Snell's law of reflection

Explanation

There is no snell's law of reflection. He formulated only law of refraction.

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200. The dualism of matter is --------- in the de Broglie relation which contains a wave concept (λ) and a particle concept (p).

Explanation

due to the inherent nature of de Broglie relation.

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Matt Balanda |BS (Aerospace Engineering) |
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Matt Balanda, a Calvary Chapel Christian School leader with a Bachelor's in Aerospace Engineering and Mathematics, transitioned from Aerospace Engineering to Education with a Master's from California Baptist University. As the High School Vice-Principal and Physics teacher, he nurtures students' love of learning and faith, creating an enriching and transformational educational experience.

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Two field lines can never cross each other.
The angle of incidence corresponding to an angle of refraction...
T denotes_________
Do electromagnetic waves carry energy and momentum like other waves?
Give example of communication systems  
The explanation of the hydrogen atom spectrum provided by Bohr's model
Light is an ------------ wave.
Maxwell's displacement current also called as electric displacement...
"In amplitude modulation the amplitude of the carrier is varied...
Radiation has dual nature
Communication is the act of transmission of--------------  
An oscillating charge is an example of accelerating charge.
Sir Arthur Conan Doyle,the creator of the famous detective Sherlock...
A particle is moving in a circular path of radius r. The displacement...
At equilibrium, the rate of generation is equal to the rate of...
The difference is often called the ________ of the circuit
The important digital circuits performing special logic operations are...
_______________ offer resistance to the movement of charges which is...
The charge q, which tests the effect of a source charge, is...
Emf is __________
The unit of Magnetic Flux Is-----------
 ----------and-----------  bands appear on the screen are...
Two large plane parallel conducting plates separated by a small...
Kirchhoff's rules
Voltage that varies like a sine function with time, is called
From Maxwell's equations that electric and magnetic fields in an...
An external input is necessary to sustain ac signal in the output for...
The centres of positive charges and of negative charges lie at the...
In a non-polar molecule, the centres of positive and negative charges...
The frequency of the incident light was smaller than a certain ...
The collisions of the electrons occur at regular intervals
Relaxation time is denoted using---------
__________= 1V/A 
The algebraic sum of changes in potential around any ...
In Rutherford's nuclear model of the atom, the entire ------ charge...
Lenz's law states When a current in a coil changes, it induces a...
The basic unit of length is harder to define as accurately in a direct...
Electric field is a --------------field, since force is a------------...
The phenomena of -----------was/were explained in a natural and...
The Bohr model is applicable to ----------- atoms.
What are the waves used in radio and television communication system?
∆s Denotes---------
If the sizes of charged bodies are very small as compared to the...
The voltage and current are ---------- with each other.
Odd one out  
The polarity of induced emf is such that it tends to produce a current...
Another phrase commonly used means potential difference between two...
VECC is------
Which one of the following is compound semiconductors?
The energy required to take out an electron from the atom is...
Ammeter is used to measure ----------.  
Coulomb force and gravitational force follow the same ----------
Which one of these is used to measure internel resitance of a...
Mass number equal to---------------
Coherently illuminated single slit usually called the...
It is also possible that emf is induced in a single isolated coil due...
Ampere's circuital law holds for----------
When fusion is achieved by raising the temperature of the system so...
_________nuclides with same mass number A are called isobars
The speed of light is _____________ and _______________
What processes the incoming message signal so as to make it suitable...
I/A, is called --------
Does a bar magner exert a torque on itself due to its own field?
The two displacements are now out of phase and the two displacements...
The net----------- through any closed surface is 0
AC generator is based on the  phenomenon of -----------
Current is a Vector Quantity
Isotope means the same place
Locus of points, which oscillate in phase is called a -------------
Each quantum of radiant energy has energy hv, where h is-----------.
Two important processes occur during the formation of a p-n...
The name electricity is coined from the Greek word __________meaning...
A gram of water contains approximately 10^22 ------------
The pole near the geographic north pole of eath is called the -------
Silver is a ---------conductor
The cyclotron uses----------- to increase the energy of charged...
Marie Sklodowska Curie  
Parallel currents repel, and anti-parallel currents attract.
The current carried by conductors due to flow of charges is called...
The process of addition of a desirable impurity to a semiconductor is...
Can we take one slab of p-type semiconductor and physically join it to...
Light of shorter wavelengths is scattered much less than light of...
Which is typically the order of magnitude of currents in domestic...
In Biot-Savart's law the relation between --------- and ------- field...
WWW was invented by the ----------------
A plane perpendicular to the dipole axis through its centre.
Young's double slit of separation ----- gives equally spaced fringes...
=      This relation is known as______
The magnitude of the induced emf in a circuit is equal to the time...
The ------------ and its balance condition provide a practical method...
Which of these potentials are same?
Electromagnetic damping related to
In ---------- model, an atom is a spherical cloud of positive charges ...
The radius of the circular component of motion is called the radius of...
Light energy is concentrated in tiny particles called _________
The ray from the point which is parallel to the principal axis. The...
The lens does not introduce any extra path differences in a...
LtR=        Voltage applied to a__________
Hertz observed that high voltage sparks across the ____ loop were...
A current or a field (electric or magnetic) emerging out of the plane...
The secondary of the transformer is provided with a centre tapping and...
Transverse elastic wave meant --------
For paraxial rays tanø=ø, now tan(n-1)ø=?...
The picture of field lines was invented by Faraday,called---------
Give an example of a material exhibiting behaviour such as relation...
Another name of Rutherford's planetary model is ----------
The modern ac generator with a typical output capacity of ------ is a...
A well-known example of alpha decay is the decay of uranium (? ,?) to...
The electric field inside the plates of the capacitor is directed...
Linear Charge density is --,surface Charge density is --,volume Charge...
Which exhibit a very weak dependence of resistivity with temperature?
The angle between the true geographic north and the north shown by a...
Which band consist of 4N energy states?  
The space-charge region on either side of the junction together is...
A portion of the output power is returned back to the input in phase...
Sound waves in air are latitudinal waves of compression and...
Diffraction is a general characteristic exhibited by -----------
The number of photoelectrons emitted per second is directly...
Kirchhoff's --------- is based on conservation of charge
A set of equations involving magnetic field, and their sources, the...
Which band is completely empty at absolute zero?  
Maxwell showed,a changing electric field must also produce a magnetic...
Electromagnetic waves are ---- of electric and magnetic fields in free...
The reflected rays converge at a point F on the _______ of a concave...
What allows transfer of files/software from one computer to another...
In -------- and---------,  light energy is redistributed
The notion of continuous charge distribution is similar to continuous...
For a frequency  of incident radiation, lower than the cut-off ...
An electron in an atom could revolve in certain stable orbits without...
Root Mean Square is also called -----------
Frequencies in the UHF range normally propagate by means of: ...
Which of the following is debroglie wavelength?
"A TV signal contains both voice and picture and is usually ...
Power of a lens is a measure of the------------
Frequency band of Satellite Communication is --------------------- ...
Magetic field  lines show the direction (at every point) along...
The de Broglie hypothesis has been basic to the development of modern...
Minimum energy required by an electron to escape from the metal...
The solution of the Schrödinger wave equation, obtained for...
Photons are electrically ------------ and are ----------- by electric...
The total current passing through any surface of which the closed loop...
The energy associated with thepropagating wave comes at the expense of...
How many basic modes of communication are there?  
When the antenna is turned ------- the signal will be greatly ...
The idea of FAX transmission was patented by Alexander Bain in...
The volume charge density also called as -----------
The resembalance of magnertic field lines for abar magnet and a...
Energy greater than the ---------- required for electron emission from...
Meissner effect, diamagnetism in --------------
First model of atom (by J.J.Thomson )was picturesquely called--------...
The existence of discrete energy levels in an atom was directly...
The SI unit for activity is becquerel, named after the discoverer of...
The phasors V and I ( for resistor) are in same phase. This mean that...
CRT used in television and computer monitors, which work on the...
The basic unit of time can be defined very accurately in terms of some...
Frequency band for cellulor mobile radio(base station to mobile) ...
Which of the following frequencies will be suitable for...
A basic law regarding flow of currents was discovered...
By applying a very strong electric field to a metal, electrons can be...
Davisson-Germer's photoelectric equation is in accordance with the...
A photocell is a technological application of the photoelectric...
In cyclotron, as the fields are perpendicular to each other are called...
What is the phenomenon where light bends around the edge of an...
Which is used for detecting optical signals?  
Coulomb used a torsion balance. A torsion balance is a sensitive...
"The electric field due to a charge configuration with total...
The magnet field lines gives us an approximate idea of the magnetic...
Millikan's ---------- precise measurements confirmed the Einstein's ...
The phenomenon of resonance is common among systems that have a...
The atomic energy programme in India was launched around the time of...
An electromagnetic wave also exerts -------
IF is --------------- than the carrier frequency  
The degree of _____________ is an indicator of the amount of charge.
Externel field: torque (in-terms of electrostatics)---------,externel...
The dimension of --------- reactance is the same as that of resistance
Approximate height of  Mesosphere over earth's surface is 
The sun is -----------.This means the electric vector takes all...
The cathode rays were discovered, in 1870, by ____ who later, in 1879,...
State Ohmic loss
Television uses the --------- to generate the magnetic fields needed.
Which is the process of recovering the modulating signal from an...
The field of the electric dipole is--------
What cable is a widely used wire medium, which offers a bandwidth of...
Even when bulk pieces of conductors are subjected to changing magnetic...
The wave nature of electrons was first experimentally verified by...
The ----------- is much weaker than even --------------.  
Insulators have:
Which type of  wave propagation  is used by short wave...
Astronomers call the increase in wavelength due to doppler effect as...
Who built the first point-contact transistor? (check all that...
Which type of  wave propagation  is used for satellite...
The self-inductance plays the role of ----------
According to  amperain loop, B is -----------
Which is not pulse modulation type  
Superposition principle,there are ----additional three-body,...
"The binding energy per nucleon is a constant and is ...
"The ---------- picture elegantly incorporated the Heisenberg's ...
State Snell's law of reflection
The dualism of matter is --------- in the de Broglie relation which...
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