Test Details

Electromagnetic Waves

Feb 14, 9:00 PM

58 minutes

Feb 15, 9:00 PM

45.0 marks

MCQ

40 questions

19891998

mentor of Maths and science with diverse perspective

Class Details

Physics

Economics

12th Physics Concepts

Physics

Economics

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Question Text

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

Question 8 :
Choose the correct answer from the alternatives given. The conduction current is the same as displacement current when the source is

Question 9 :
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:

Question 10 :
Which wave characteristic describes the product of the frequency and the wavelength?

Question 11 :
Maxwell's corrections to Ampere's law was required when the later was extended to:

Question 12 :
According to Maxwell's hypothesis, a changing electric field gives rise to

Question 13 :
The propagation constant of a photon of wavelength $6284 \ A^o$ 

Question 16 :
Identify which of the following is NOT a characteristic of electromagnetic waves?

Question 18 :
A metal block is exposed to beams of X-ray of different wavelength. X-rays of which wavelength penetrate most?

Question 19 :
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 21 :
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 22 :
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 23 :
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 24 :
According to Maxwell's equation, the velocity of light in any medium is expressed as

Question 26 :
The displacement current flows in the dielectric of a capacitor when the potential difference across its plates

Question 27 :
Which of the following type of radiations are radiated by on oscillating electric charge?

Question 29 :
Thefrequency of incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is

Question 30 :
Which of the following is the right derivation for Ampere-Maxwell law?

Question 31 :
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 32 :
Which of the following has/have zero average value in a plane electromagnetic wave?

Question 33 :
An electromagnetic radiation has an energy of 13.2 keV. Then the radiation belongs to the region of

Question 34 :
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 35 :
A plane electromagnetic wave of wavelength $\lambda$ has an intensity $I$. It is propagating along the positive $Y-direction$. The allowed expressions for the electric and magnetic fields are given by

Question 36 :
Radiations of intensity $0.5\ W/m^{2}$ are striking a metal plate. The pressure on the plate is

Question 37 :
Wavelength of, monochromatic light is $5000 \mathring A$. It's wave number is:

Question 39 :
Assertion: Electromagnetic waves carry energy and momentum. Reason: Electromagnetic waves can be polarised.

Question 40 :
The amplitude of the magnetic field of a harmonic electromagnetic wave in vacuum is ${B}_{0}$= 510 nT. The amplitude of the electric field part of the wave is

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