Physics Ch 4 Class 12 Electromagnetic Induction


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When a conductor moves In magnetic field the Induced emf Is

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In medical scanning, which rays are used?

PMC Practice 18
Physics
Electromagnetic Waves
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A star moving away from earth shows:

PMC Practice 21
Physics
Electromagnetic Waves
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Which of the following does not travel in vacuum?

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The region that lies between IR and UV regions is called:

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Michelson’s interferometer works on the principle of:

PMC Practice 21
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Electromagnetic Waves
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Microwaves are _______ waves.

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Electromagnetic Waves
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Which one of the following waves needs a medium to travel?

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Extraterrestial waves are also called:

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A stationary wave is formed in a pipe which is open at one end. If length of pipe is L, then what is the maximum possible wavelength of the wave.?

PMC Practice 20
Physics
Electromagnetic Waves
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The light we see is:

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A common material for cushioning objects in packages is made by trapping bubbles of air between sheets of plastic. Is this material more effective at keeping the contents of the package from moving around inside the package?

PMC Practice 8
Physics
Electromagnetic Waves
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If Ns/Np is the turn ratio, then for step up transformer

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A changing electric field produces

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The direct exposure of sun light where ozone layer is depleted will cause:

2022 PMC Test 1
Physics
Electromagnetic Waves
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When carrying electricity on long distances. Step up transformer are used to:

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Transformer cannot step up

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Longitudinal standing wave, in second harmonic mode, is established in a tube that is open at both ends. The length of the tube is 0.8m. What is the wavelength of the waves that make up the standing wave?

PMC Practice 10
Physics
Electromagnetic Waves
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The distance between two consecutive nodes is:

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A tuning fork A produces 4 beats with another tuning fork B. if the frequency of tuning fork B is 320 Hz, then the frequency of tuning fork A is:

PMC Practice 21
Physics
Electromagnetic Waves
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Applications of laser is/are:

NTS 2011
Physics
Electromagnetic Waves
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Which rays are used in LASER?

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Physics
Electromagnetic Waves
Wave Motion and Sound
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Which of the following is not major application of electromagnetic induction

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In water pipes, ____ is used to detect leakages.

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Infrasonic waves have a frequency of:

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A coil is placed near a magnet. Emf will be induced in it when

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The electromagnetic radiation which moves with high frequency will have _______ wavelength:

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Physics
Electromagnetic Waves
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Polarization explains light is ———

PMC Practice 8
Physics
Electromagnetic Waves
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The direction of induced emf is given by which of the following law?

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X-rays are used to measure?

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Electromagnetic Waves
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The wave in which crest and trough superimpose each other is ?

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Microwave is:

2022 PMC Test 3
Physics
Electromagnetic Waves
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In microwave ovens ____ is used to heat the food

PMC Practice 33
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Electromagnetic Waves
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Torsion balance is used to measure:

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When interference between thin films occurs, the path difference between two interfering rays is 2t. If ‘n’ is the refractive index of the medium, the bright circles are obtained when ________ with m = 0, 1, 2, 3, …

NUMS 2019 Reconduct
Physics
Electromagnetic Waves
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Polarization of light shows that it is:

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A sound wave travels from a region of hot air into a region of cold air. How does frequency and wavelength of sound change?

PMC Practice 21
Physics
Electromagnetic Waves
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Electromagnetic waves are produced by:

NTS 2012
Physics
Electromagnetic Waves
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Which of the following is CORRECT for photons?

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Which of the following statement is true? i) Toroid is a solenoid bent into circular path ii) Solenoid is a tarok’ in open

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If the current flow increases to 100 times, the energy stored in the inductor will increase to:

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Rays produced by LED are:

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potential difference in charge between two points in a circuit is known as?

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In single slit diffraction, when wavelength lameda increases:

PMC Practice 20
Physics
Electromagnetic Waves
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Characteristic x-rays are produced by:

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Electromagnetic Waves
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Which of the following is not E.M wave?

ETEA 2019
Physics
Electromagnetic Waves
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Energy emitted in the form of visible radiation is called:

2022 PMC Test 1
Physics
Electromagnetic Waves
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Which list shows electromagnetic waves in order of increasing frequency?

ETEA 2018
Physics
Electromagnetic Waves
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An electromagnetic wave travels in a straight line through a vacuum. The wave has a frequency of 6.0 THz. What is the number of wavelengths in a distance of 1.0 m along the wave?

ETEA 2018
Physics
Electromagnetic Waves
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