Test Details

Electromagnetic Waves

Jan 18, 7:00 PM

30 minutes

Jan 18, 7:30 PM

20.0 marks

MCQ

20 questions

Prakhar Shukla

Class Details

Physics

Prakhar Sir 12th

Physics

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Question Text

Question 1 :
Which of the following type of radiations are radiated by on oscillating electric charge?

Question 2 :
The displacement current flows in the dielectric of a capacitor when the potential difference across its plates

Question 3 :
The propagation constant of a photon of wavelength $6284 \ A^o$ 

Question 4 :
An  AM radio wave is emitted by a radio antenna and travels across flat ground. Find out the direction of the magnetic field component of the wave?

Question 5 :
A metal block is exposed to beams of X-ray of different wavelength. X-rays of which wavelength penetrate most?

Question 7 :
Which of the following is the right derivation for Ampere-Maxwell law?

Question 8 :
Assertion: When variable frequency AC source is connected to a capacitor, displacement current increases with increase in frequency Reason: As frequency increases conduction current also increases

Question 10 :
Thefrequency of incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is

Question 12 :
Which wave characteristic describes the product of the frequency and the wavelength?

Question 14 :
According to Maxwell's hypothesis, a changing electric field gives rise to

Question 15 :
Choose the correct answer from the alternatives given. The conduction current is the same as displacement current when the source is

Question 16 :
Instantaneous displacement current $1A$ in the space between the parallel plates of $1\mu F$ capacitor can be established by changing the potential difference at the rate of:

Question 17 :
The frequency of electromagnetic wave in free space is $2$ MHz. When it passes through a region of relative permittivity $\varepsilon_r=4.0$, then its wave length __________ & frequency ______________.

Question 18 :
Choose the correct answer from alternatives given. If $\vec { E } $ and $\vec { B } $ represent electric and magnetic field vectors of an electromagnetic wave, the direction of propagation of the wave is along

Question 20 :
If the directions of electric and magnetic field vectors of a plane electromagnetic wave are along positive $y$-direction and positive $z$-direction respectively, then the direction of propagation of the wave is along:

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