Test Details

Electromagnetic Waves

Jan 20, 6:00 PM

60 minutes

Jan 20, 7:00 PM

25.0 marks

MCQ

25 questions

Er. prem chand azad

physics teacher of st. Mary's school masaurhi

Class Details

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Question Text

Question 1 :
The frequency of incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is

Question 2 :
In a parallel C-R network with a voltage source, the current flowing through resistor is _______ current and that flowing through the capacitor is ________ current.

Question 5 :
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 6 :
According to Maxwell's equation, the velocity of light in any medium is expressed as

Question 7 :
In electromagnetic wave, according to Maxwell, changing electric field gives _______.

Question 8 :
Which wave characteristic describes the product of the frequency and the wavelength?

Question 9 :
Maxwell's corrections to Ampere's law was required when the later was extended to:

Question 11 :
Fill in the blanks.  Current flowing through the resistor is known as ________ , while the current flowing through the capacitor is commonly known as _______.

Question 13 :
The displacement current flows in the dielectric of a capacitor when the potential difference across its plates

Question 18 :
Identify which of the following is NOT a characteristic of electromagnetic waves?

Question 19 :
According to Maxwell's hypothesis, a changing electric field gives rise to

Question 20 :
Choose the correct answer from the alternatives given. Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor

Question 22 :
An electromagnetic radiation has an energy of 13.2 keV. Then the radiation belongs to the region of

Question 23 :
Choose the correct answer from the alternatives given. The conduction current is the same as displacement current when the source is

Question 24 :
The propagation constant of a photon of wavelength $6284 \ A^o$ 

Question 25 :
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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