Electromagnetic waves Book Back Practice Test

12th Standard Physics — Electromagnetic waves: Book Back Online Practice Test

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The dimension of \(\frac{1}{\mu_o \epsilon_o}\) is

A.\([L T^{-1}]\) B.\([L^2 T^{-2}]\) C.\([L^{-1} T]\) D.\([L^{-2} T^2]\)

If the amplitude of the magnetic field is \(3 \times 10^{-6}\) T, then the amplitude of the electric field for an electromagnetic wave is

A.100 V m\(^{-1}\) B.300 V m\(^{-1}\) C.600 V m\(^{-1}\) D.900 V m\(^{-1}\)

Which of the following electromagnetic radiations is used for viewing objects through fog?

A.microwave B.gamma rays C.X-rays D.infrared

Which of the following is false for electromagnetic waves?

A.transverse B.non-mechanical waves C.longitudinal D.produced by accelerating charges

Consider an oscillator which has a charged particle oscillating about its mean position with a frequency of 300 MHz. The wavelength of electromagnetic waves produced by this oscillator is

A.1 m B.10 m C.100 m D.1000 m

The electric and the magnetic fields, associated with an electromagnetic wave, propagating along negative X axis can be represented by

A.\(\vec{E} = E_o \hat{i}, \vec{B} = B_o \hat{k}\) B.\(\vec{E} = E_o \hat{k}, \vec{B} = B_o \hat{j}\) C.\(\vec{E} = E_o \hat{i}, \vec{B} = B_o \hat{j}\) D.\(\vec{E} = E_o \hat{j}, \vec{B} = B_o \hat{i}\)

In an electromagnetic wave travelling in free space the rms value of the electric field is 3 V m\(^{-1}\). The peak value of the magnetic field is

A.\(1.414 \times 10^{-8}\) T B.\(1.0 \times 10^{-8}\) T C.\(2.828 \times 10^{-8}\) T D.\(2.0 \times 10^{-8}\) T

An e.m. wave is propagating in a medium with a velocity \(\vec{v} = v\hat{i}\). The instantaneous oscillating electric field of this e.m. wave is along +y-axis, then the direction of oscillating magnetic field of the e.m. wave will be along:

A.–y direction B.–x direction C.+z direction D.–z direction

If the magnetic monopole exists, then which of the Maxwell’s equation to be modified?

A.\(\oint \vec{E} \cdot d\vec{A} = \frac{Q_{enclosed}}{\epsilon_o}\) B.\(\oint \vec{B} \cdot d\vec{A} = 0\) C.\(\oint \vec{B} \cdot d\vec{l} = \mu_o i_c + \mu_o \epsilon_o \frac{d\Phi_E}{dt}\) D.\(\oint \vec{E} \cdot d\vec{l} = -\frac{d\Phi_B}{dt}\)

Q10

Fraunhofer lines are an example of _______ spectrum.

A.line emission B.line absorption C.band emission D.band absorption

Q11

Which of the following is an electromagnetic wave?

A.\(\alpha\) - rays B.\(\beta\) - rays C.\(\gamma\) - rays D.all of them

Q12

Which one of them is used to produce a propagating electromagnetic wave?

A.an accelerating charge B.a charge moving with constant velocity C.a stationary charge D.an uncharged particle

Q13

If \(E = E_o \sin[10^6 x - \omega t]\) be the electric field of a plane electromagnetic wave, the value of \(\omega\) is

A.\(0.3 \times 10^{-14}\) rad s\(^{-1}\) B.\(3 \times 10^{-14}\) rad s\(^{-1}\) C.\(0.3 \times 10^{14}\) rad s\(^{-1}\) D.\(3 \times 10^{14}\) rad s\(^{-1}\)

Q14

Which of the following is NOT true for electromagnetic waves?

A.it transports energy B.it transports momentum C.it transports angular momentum D.in vacuum, it travels with different speeds which depend on their frequency

Q15

The electric and magnetic fields of an electromagnetic wave are

A.in phase and perpendicular to each other B.out of phase and not perpendicular to each other C.in phase and not perpendicular to each other D.out of phase and perpendicular to each other

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About this Electromagnetic waves test

This free online practice test covers Electromagnetic waves from the 12th Standard Physics (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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