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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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Characteristic x-rays are produced by:
PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:
Electric Generators work on the principle of:
Orange light in a vacuum has a wavelength of 600 nm. What is the frequency of this light?
ETEA 2018
Physics
Electromagnetic Waves
Elimination Tool:
Which of the following is CORRECT for photons?
PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:
A D.C generator is converted in A.C generator by
Resistance opposes current, inductor opposes
Which of the following does not travel in vacuum?
PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:
Microwave is:
2022 PMC Test 3
Physics
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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Unit of induced emf is
The electromagnetic radiation which moves with high frequency will have _______ wavelength:
2022 PMC Test 3
Physics
Electromagnetic Waves
Elimination Tool:
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
Elimination Tool:
The direct exposure of sun light where ozone layer is depleted will cause:
2022 PMC Test 1
Physics
Electromagnetic Waves
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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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The region that lies between IR and UV regions is called:
PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:
What will be the energy stored In an inductor of length 2m if a current of 10A passes through it
The wave in which crest and trough superimpose each other is ?
PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:
Extraterrestial waves are also called:
PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:
Beta rays cannot be stopped by:
PMC Practice 11
Physics
Electromagnetic Waves
Elimination Tool:
A changing electric field produces
The direction of induced emf is given by which of the following law?
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
Elimination Tool:
A star moving away from earth shows:
PMC Practice 21
Physics
Electromagnetic Waves
Elimination Tool:
Sound waves are:
PMC 2021 Tested
Physics
Electromagnetic Waves
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The light we see is:
PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:
Polarization explains light is ———
PMC Practice 8
Physics
Electromagnetic Waves
Elimination Tool:
Michelson’s interferometer works on the principle of:
PMC Practice 21
Physics
Electromagnetic Waves
Elimination Tool:
Rays produced by LED are:
PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:
Which of the following phenomenon proves that light waves are transverse waves?
PMC Practice 4
Physics
Electromagnetic Waves
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In water pipes, ____ is used to detect leakages.
PMC 2021 Tested
Physics
Electromagnetic Waves
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Infrasonic waves have a frequency of:
PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:
X-rays are used to measure?
PMC Practice 8
Physics
Electromagnetic Waves
Elimination Tool:
Applications of laser is/are:
NTS 2011
Physics
Electromagnetic Waves
Elimination Tool:
Induced emf depends upon:
Transformer cannot step up
A.C generator can be converted into D.0 generator by
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
Elimination Tool:
If the current flow increases to 100 times, the energy stored in the inductor will increase to:
Electromagnetic waves are produced by:
NTS 2012
Physics
Electromagnetic Waves
Elimination Tool:
Microwaves are _______ waves.
PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:
When a conductor moves In magnetic field the Induced emf Is
In microwave ovens ____ is used to heat the food
PMC Practice 33
Physics
Electromagnetic Waves
Elimination Tool:
If Ns/Np is the turn ratio, then for step up transformer
Which of the following is not major application of electromagnetic induction
Which one of the following requires no medium?
PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:
Energy emitted in the form of visible radiation is called:
2022 PMC Test 1
Physics
Electromagnetic Waves
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Torsion balance is used to measure:
In single slit diffraction, when wavelength lameda increases:
PMC Practice 20
Physics
Electromagnetic Waves
Elimination Tool:
Which of the following is not E.M wave?
ETEA 2019
Physics
Electromagnetic Waves
Elimination Tool:
Which rays are used in LASER?
PMC 2021 Tested
Physics
Electromagnetic Waves
Wave Motion and Sound
Elimination Tool:
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
Elimination Tool:
Polarization of light shows that it is:
PMC 2021 Tested
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
Elimination Tool:
In medical scanning, which rays are used?
PMC Practice 18
Physics
Electromagnetic Waves
Elimination Tool:
A coil is placed near a magnet. Emf will be induced in it when
Which one of the following waves needs a medium to travel?
PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:
Which of the following statement is true? i) Toroid is a solenoid bent into circular path ii) Solenoid is a tarok’ in open
Which of the following statements is True about the A.0 and D.0 Generators?
Which electrical quantity cannot be changed by a transformer?
Choose the correct arrangement of the various regions of the electromagnetic spectrum in terms of wave length.
ETEA 2017
Physics
Electromagnetic Waves
Elimination Tool:
Which list shows electromagnetic waves in order of increasing frequency?
ETEA 2018
Physics
Electromagnetic Waves
Elimination Tool:
potential difference in charge between two points in a circuit is known as?
When carrying electricity on long distances. Step up transformer are used to:
The distance between two consecutive nodes is:
PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool: