# Physics Ch 4 Class 12 Electromagnetic Induction

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A D.C generator is converted in A.C generator by

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

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

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Physics
Electromagnetic Waves
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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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Torsion balance is used to measure:

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Characteristic x-rays are produced by:

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

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The light we see is:

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Electromagnetic Waves
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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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Electromagnetic waves are produced by:

NTS 2012
Physics
Electromagnetic Waves
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In water pipes, ____ is used to detect leakages.

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Electromagnetic Waves
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The distance between two consecutive nodes is:

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Which one of the following requires no medium?

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Michelson’s interferometer works on the principle of:

PMC Practice 21
Physics
Electromagnetic Waves
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A coil is placed near a magnet. Emf will be induced in it when

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A star moving away from earth shows:

PMC Practice 21
Physics
Electromagnetic Waves
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If Ns/Np is the turn ratio, then for step up transformer

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Polarization of light shows that it is:

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When a conductor moves In magnetic field the Induced emf Is

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Infrasonic waves have a frequency of:

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Polarization explains light is ———

PMC Practice 8
Physics
Electromagnetic Waves
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Induced emf depends upon:

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What will be the energy stored In an inductor of length 2m if a current of 10A passes through it

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Which of the following statements is True about the A.0 and D.0 Generators?

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Which electrical quantity cannot be changed by a transformer?

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Germanium and silicon are semiconductors having crystalline structures. Both these materials have ______ valence electrons in their outermost shells.

NTS 2014
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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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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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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Beta rays cannot be stopped by:

PMC Practice 11
Physics
Electromagnetic Waves
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The wave in which crest and trough superimpose each other is ?

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Microwaves are _______ waves.

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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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Energy emitted in the form of visible radiation is called:

2022 PMC Test 1
Physics
Electromagnetic Waves
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Extraterrestial waves are also called:

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A.C generator can be converted into D.0 generator by

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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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Which of the following is not major application of electromagnetic induction

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Applications of laser is/are:

NTS 2011
Physics
Electromagnetic Waves
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Electric Generators work on the principle of:

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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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Which of the following phenomenon proves that light waves are transverse waves?

PMC Practice 4
Physics
Electromagnetic Waves
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In microwave ovens ____ is used to heat the food

PMC Practice 33
Physics
Electromagnetic Waves
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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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Sound waves are:

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A changing electric field produces

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

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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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