CBSE Class 12 Physics Quiz Test
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Two field lines can never cross each other.
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True
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False
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.
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 designed 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 See morechallenging 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!
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- 2.
The angle of incidence corresponding to an angle of refraction ---------, is called the critical angle.
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10º
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70º
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90º
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80º
Correct Answer
A. 90ºExplanation
from Snell’s lawRate this question:
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- 3.
T denotes_________
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Tesla
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Test law
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Testla
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Teslla
Correct Answer
A. TeslaExplanation
SI unit .Rate this question:
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- 4.
Do electromagnetic waves carry energy and momentum like other waves?
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Yes
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No
Correct Answer
A. YesExplanation
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.Rate this question:
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- 5.
The explanation of the hydrogen atom spectrum provided by Bohr’s model
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TRUE
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False
Correct Answer
A. TRUEExplanation
The explanation of the hydrogen atom spectrum provided by Bohr’s model.Rate this question:
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- 6.
Give example of communication systems
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Television broadcast
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Microwave links
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Satellite communication
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All of the above
Correct Answer
A. All of the aboveExplanation
"Television broadcast, microwave links and satellite communication
are some examples of communication systems that use space wave mode of propagation."Rate this question:
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- 7.
Light is an ------------ wave.
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Invisible wave
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Radio wave
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Short distance wave
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Electromagnetic
Correct Answer
A. ElectromagneticExplanation
Maxwell equation led to the remarkable conclusion that light is an electromagnetic wave.Rate this question:
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- 8.
"In amplitude modulation the amplitude of the carrier is varied in accordance with the information signal."
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True
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False
Correct Answer
A. TrueExplanation
Since it is AMPLITUDE MODULATIONRate this question:
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- 9.
Radiation has dual nature
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Wave
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Particle
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Both A & B
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A or B
Correct Answer
A. Both A & BExplanation
Radiation has dual nature: wave and particle.Rate this question:
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- 10.
Maxwell’s displacement current also called as electric displacement current.
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TRUE
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FALSE
Correct Answer
A. TRUEExplanation
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.Rate this question:
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- 11.
Communication is the act of transmission of--------------
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Speech
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Data
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Video
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All of the above
Correct Answer
A. All of the aboveExplanation
Communication is the act of transmission of information (can be any signal).Rate this question:
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- 12.
Sir Arthur Conan Doyle,the creator of the famous detective Sherlock Holmes
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TRUE
-
FALSE
Correct Answer
A. TRUEExplanation
Sir Arthur Conan Doyle (the creator of the famous detective Sherlock Holmes)Rate this question:
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- 13.
A particle is moving in a circular path of radius r. The displacement after half a circle would be:
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Zero
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πr
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2r
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2πr
Correct Answer
A. 2rExplanation
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.Rate this question:
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- 14.
An oscillating charge is an example of accelerating charge.
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TRUE
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False
Correct Answer
A. TRUEExplanation
StatementRate this question:
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- 15.
_______________ offer resistance to the movement of charges which is intermediate between the conductors and insulators.
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Dielectric
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Nonconductors
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Semiconductors
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Nonmetals
Correct Answer
A. SemiconductorsExplanation
They have temperature dependent characterticsRate this question:
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- 16.
The charge q, which tests the effect of a source charge, is called___________
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Postive Charge
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Negative charge
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Auxilary charge
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Test charge
Correct Answer
A. Test chargeExplanation
The source charge Q must remain at its original locationRate this question:
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- 17.
Two large plane parallel conducting plates separated by a small distance.
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Parallel plane capacitors
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Serial plate capacitors
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Parallel plate capacitors
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Serial plane capacitors
Correct Answer
A. Parallel plate capacitorsExplanation
A parallel plate capacitor consists of two large plane parallel conducting plates.Rate this question:
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- 18.
Emf is __________
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Electromotive force
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Electromagnetic force
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Electromechnical force
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Electricmechical force
Correct Answer
A. Electromotive forceExplanation
General abbrevationRate this question:
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- 19.
The unit of Magnetic Flux Is-----------
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Volt
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Weber
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Henry
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Ohm
Correct Answer
A. WeberExplanation
based on the unitsRate this question:
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- 20.
----------and----------- bands appear on the screen are called fringes.
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Dark,bright
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Dim,dark
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White,bright
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Gray,black
Correct Answer
A. Dark,brightExplanation
Due to monocolor nature of fringesRate this question:
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- 21.
At equilibrium, the rate of generation is equal to the rate of recombination of charge carriers.
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TRUE
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False
Correct Answer
A. TRUEExplanation
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.Rate this question:
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- 22.
The important digital circuits performing special logic operations are called --------------gates.
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OR
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NOT
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AND
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All the above
Correct Answer
A. All the aboveExplanation
The important digital circuits performing special logic operations are called logic gates. These are: OR, AND, NOT, NAND, and NOR gates.Rate this question:
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- 23.
The difference is often called the ________ of the circuit
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Voltage
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Brandwidth
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Frequency deviation
Correct Answer
A. Frequency deviationExplanation
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.Rate this question:
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- 24.
Kirchhoff’s rules
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Junction rule & loop rule
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Junctional rule & loop rule
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Mesh rule & node rule
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Loop rule & node rule
Correct Answer
A. Junction rule & loop ruleExplanation
Termed as junction & loop rule.Rate this question:
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- 25.
Voltage that varies like a sine function with time, is called
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Alter voltage
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Alternative voltage
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Alternating voltage
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Alternation voltage
Correct Answer
A. Alternating voltageExplanation
Such a voltage is called alternating voltage (ac voltage)Rate this question:
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- 26.
From Maxwell’s equations that electric and magnetic fields in an electromagnetic wave are ------- to each other
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Normal
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Parellel
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Perpendicular
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Transverse
Correct Answer
A. PerpendicularExplanation
nature of electromagnetic wavesRate this question:
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- 27.
In a non-polar molecule, the centres of positive and negative charges coincide.
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FALSE
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TRUE
Correct Answer
A. TRUEExplanation
Nature of non-polar molecules.Rate this question:
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- 28.
The collisions of the electrons occur at regular intervals
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False
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True
Correct Answer
A. FalseExplanation
"since, the direction of the velocity of an electron is completely
random."Rate this question:
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- 29.
The centres of positive charges and of negative charges lie at the same place,their dipole moment is -----------.
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Uncertain
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Zero
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Not zero
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Infinity
Correct Answer
A. ZeroExplanation
In most molecules, the centres of positive charges and of negative charges lie at the same place. Therefore, their dipole moment is zero.Rate this question:
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- 30.
Relaxation time is denoted using---------
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σ
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τ
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λ
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ρ
Correct Answer
A. τExplanation
Standard denotion.Rate this question:
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- 31.
__________= 1V/A
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1℮
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1Ω
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1ρ
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1σ
Correct Answer
A. 1ΩExplanation
unit of resistance.Rate this question:
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- 32.
The frequency of the incident light was smaller than a certain minimum value, called the____________ frequency.
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Thresthold
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Thrusthold
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threshold
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Freshold
Correct Answer
A. thresholdExplanation
Generally termed as Threshold FrequencyRate this question:
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- 33.
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.
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Positive
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Negative
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Positive and negative
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Positive or negative
Correct Answer
A. PositiveExplanation
only positiveRate this question:
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- 34.
An external input is necessary to sustain ac signal in the output for an -------------
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Amplifier
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Switch
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Only switch not amplifier
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None of the above
Correct Answer
A. AmplifierExplanation
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.Rate this question:
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- 35.
Electric field is a --------------field, since force is a------------ quantity
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Vector,Vector
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Scalar,Vector
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Vector,Scaler
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Scalar,Scalar
Correct Answer
A. Vector,VectorExplanation
"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."Rate this question:
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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.
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TRUE
-
FALSE
Correct Answer
A. TRUEExplanation
When a current in a coil changes, it induces a back emf in the same coil.Rate this question:
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- 37.
The basic unit of length is harder to define as accurately in a direct way.
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TRUE
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FALSE
Correct Answer
A. TRUEExplanation
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.Rate this question:
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- 38.
The Bohr model is applicable to ----------- atoms.
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Boron
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Helium
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Lithium
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Hydrogenic
Correct Answer
A. HydrogenicExplanation
The explanation of the hydrogen atom spectrum provided by Bohr’s model.Rate this question:
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- 39.
The algebraic sum of changes in potential around any closed loop must be-----
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Negative
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Positive
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Zero
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All the above
Correct Answer
A. ZeroExplanation
based on loop rule.Rate this question:
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- 40.
The phenomena of -----------was/were explained in a natural and satisfactory way by the wave picture of light.
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Interference
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Diffraction
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Polarisation
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All the above
Correct Answer
A. All the aboveExplanation
The phenomena of interference, diffraction and polarisation were explained in a natural and satisfactory way by the wave picture of light.Rate this question:
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- 41.
∆s Denotes---------
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Vector area element
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Electric field
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Electric flux
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Electric charge
Correct Answer
A. Vector area elementExplanation
According to physical quantity it denotes vector area elementRate this question:
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- 42.
The voltage and current are ---------- with each other.
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In phase
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Out phase
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On phase
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Some phase
Correct Answer
A. In phaseExplanation
Inphase to each other.Rate this question:
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- 43.
Which one of these is used to measure internel resitance of a cell
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Wheatstone bridge
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Ammetre
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Potentiometre
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Metre bridge
Correct Answer
A. PotentiometreExplanation
For this the cell (emf e ) whose internal resistance (r) is to be determined isconnected across a resistance box through a key K2.Rate this question:
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- 44.
VECC is------
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Variable energy cyclotron center
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variation energy cyclotron center
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Variant energy cyclotron center
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Various energy cyclotron center
Correct Answer
A. Variable energy cyclotron centerExplanation
Since the variable energy cyclotron was build in VECC, kolkata.Rate this question:
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- 45.
The polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it.
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Law of electromagnetic induction
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Lenz’s law
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Len's law
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Motional electromotive law
Correct Answer
A. Lenz’s lawExplanation
Lenz's law statement.Rate this question:
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- 46.
Another phrase commonly used means potential difference between two points?
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Flux
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Field
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Density
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Voltage
Correct Answer
A. VoltageExplanation
potential difference between two points also known as voltage.Rate this question:
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- 47.
What are the waves used in radio and television communication system?
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Microwaves
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Infrared
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Radio
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Ultraviolet
Correct Answer
A. RadioExplanation
radio waves are used in radio and television communication systems.Rate this question:
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- 48.
If the sizes of charged bodies are very small as compared to the distance between time, call as________
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point charges
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Positive charge
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Source charge
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Test charge
Correct Answer
A. point chargesExplanation
we treat them as point charges.Rate this question:
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- 49.
Which one of the following is compound semiconductors?
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PI
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Cd
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Si
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Combinedly both B & C
Correct Answer
A. Combinedly both B & CExplanation
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.Rate this question:
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Dec 02, 2024Quiz Edited by
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Expert Reviewed by
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Dec 20, 2013Quiz Created by
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