iCON Education - Electromagnetic Waves AP-EAPCET Test

Candidate Name

Student

Exam Name

AP-EAPCET

Test Name

Electromagnetic Waves

Subject

Physics

← Back to Electromagnetic Waves

Remaining Time

00:35:00

Question 1: Palette 1/35

AP-EAPCET 2025 MCQ

If the magnetic field in a plane progressive wave is represented by the equation $B_y=2 \times 10^{-7} \sin \left(0.5 \times 10^3 x+1.5 \pi \times 10^{11} t\right) \mathrm{T}$, then the frequency of the wave is

(In the equation time $t$ is in second)

$75 \times 10^9 \mathrm{~Hz}$

$150 \times 10^9 \mathrm{~Hz}$

$75 \times 10^7 \mathrm{~Hz}$

$150 \times 10^7 \mathrm{~Hz}$

Question 2: Palette 2/35

AP-EAPCET 2025 MCQ

If $11 \%$ of the power of a 200 W bulb is converted to visible radiation, then the intensity of the light at a distance of 100 cm from the bulb is

$10.5 \mathrm{~W} \mathrm{~m}^{-2}$

$5.25 \mathrm{~W} \mathrm{~m}^{-2}$

$3.5 \mathrm{Wm}^{-2}$

$1.75 \mathrm{~W} \mathrm{~m}^{-2}$

Question 3: Palette 3/35

AP-EAPCET 2025 MCQ

If a 10 W bulb emits electromagnetic waves uniformly in all directions, then the intensity of light at a distance 0.5 m from the source is nearly

$3.18 \mathrm{Wm}^{-2}$

$0.31 \mathrm{Wm}^{-2}$

$0.62 \mathrm{Wm}^{-2}$

$5 \mathrm{Wm}^{-2}$

Question 4: Palette 4/35

AP-EAPCET 2025 MCQ

The layer of the atmosphere that reflects low frequency (LF) electromagnetic waves during day time only is

$D$

$E$

$F_1$

$F_2$

Question 5: Palette 5/35

AP-EAPCET 2025 MCQ

The oscillating electric and magnetic field vectors of an electromagnetic wave are along

the same direction and in same phase.

the same direction but have a phase difference of $90^{\circ}$.

mutually perpendicular directions and are in same phase.

mutually perpendicular directions but have a phase difference of $90^{\circ}$.

Question 6: Palette 6/35

AP-EAPCET 2025 MCQ

The waves having maximum wavelength among the following electromagnetic waves is

X-rays

radio waves

UV-waves

visible rays

Question 7: Palette 7/35

AP-EAPCET 2025 MCQ

The ratio of the magnitudes of the electric field and $10^8$ times the magnetic field of a plane electromagnetic wave is

$1: 3$

$3: 1$

$1: 1$

$1: \sqrt{3}$

Question 8: Palette 8/35

AP-EAPCET 2025 MCQ

If the rms value of the electric field of electromagnetic waves at a distance of 3 m from a point source is $3 \mathrm{NC}^{-1}$, then the power of the source is

10.8 W

8.1 W

5.4 W

2.7 W

Question 9: Palette 9/35

AP-EAPCET 2025 MCQ

The magnitude of the electric field of a plane electromagnetic wave travelling in free space is $E$. If $\mu_0$ and $\varepsilon_0$ are respectively permeability and permittivity of the free space, then the magnitude of magnetic field of the wave is

$E \mu_0 \varepsilon_0$

$\frac{E}{\mu_0 \varepsilon_0}$

$E \sqrt{\mu_0 \varepsilon_0}$

$\frac{E}{\sqrt{\mu_0 \varepsilon_0}}$

Question 10: Palette 10/35

AP-EAPCET 2025 MCQ

A plane electromagnetic wave of frequency 25 MHz propagates in vacuum along positive $x$-direction. At a particular point in space and time, if the electric field is $63 \hat{\mathrm{j}} \mathrm{Vm}^{-1}$, then the magnitude of the magnetic field of the wave at this point at the same time is

$2.1 \times 10^{-8} \mathrm{~T}$

$4.2 \times 10^{-8} \mathrm{~T}$

$6.3 \times 10^{-8} \mathrm{~T}$

$8.4 \times 10^{-8} \mathrm{~T}$

Question 11: Palette 11/35

AP-EAPCET 2025 MCQ

If the magnetic field inside a solenoid is $B$, then the magnetic energy stored in it per unit volume is ( $c=$ speed of light in vacuum and $\varepsilon_0$ is permittivity of free space)

$\varepsilon_0 c^2 B^2$

$\frac{\varepsilon_0 c^2 B^2}{2}$

$2 \varepsilon_0 c^2 B^2$

$\frac{\varepsilon_0 c^2 B^2}{4}$

Question 12: Palette 12/35

AP-EAPCET 2025 MCQ

In a plane electromagnetic wave, the magnetic field is given by $\mathbf{B}=3 \times 10^{-7} \sin \left(100 \pi x+10^{12} t\right) \mathrm{T}$, then the wavelength of the wave is

(In the equation $x$ is in metre and $t$ is in second)

0.02 m

0.2 m

0.4 m

0.04 m

Question 13: Palette 13/35

AP-EAPCET 2024 MCQ

For plane electromagnetic waves propagating in the positive $z$-direction. The combination which gives the correct possible direction for $\mathbf{E}$ and $\mathbf{B}$ fields respectively is

$(-2 \hat{\mathbf{i}}-3 \hat{\mathbf{j}})$ and $(3 \hat{\mathbf{i}}-2 \hat{\mathbf{j}})$

$(3 \hat{i}+4 \hat{j})$ and $(4 \hat{i}-3 \hat{j})$

$(\hat{\mathbf{i}}-2 \hat{\mathbf{j}})$ and $(-2 \hat{\mathbf{i}}-\hat{\mathbf{j}})$

$(-2 \hat{\mathbf{i}}+3 \hat{\mathbf{j}})$ and $(\hat{\mathbf{i}}+2 \hat{\mathbf{j}})$

Question 14: Palette 14/35

AP-EAPCET 2024 MCQ

Size of the antenna for a carrier wave of frequency 3 MHz is

75 m

50 m

2.5 m

25 m

Question 15: Palette 15/35

AP-EAPCET 2024 MCQ

The radiation of energy $E$ falls normally on a perfectly reflecting surface. The momentum transferred to the surface is

$\frac{E}{C}$

$\frac{2 E}{c}$

$\frac{E}{c^2}$

$\frac{2 E}{c^2}$

Question 16: Palette 16/35

AP-EAPCET 2024 MCQ

The structure of solids is investigated by using

cosmic rays

$\beta$-rays

X-rays

$\boldsymbol{\gamma}$-rays

Question 17: Palette 17/35

AP-EAPCET 2024 MCQ

The rms value of the electric field of an electromagnetic wave emitted by a source is $660 \mathrm{NC}^{-1}$. The average energy density of the electromagnetic wave is

$1.75 \times 10^{-6} \mathrm{Jm}^{-3}$

$2.75 \times 10^{-6} \mathrm{Jm}^{-3}$

$4.85 \times 10^{-6} \mathrm{Jm}^{-3}$

$3.85 \times 10^{-6} \mathrm{Jm}^{-3}$

Question 18: Palette 18/35

AP-EAPCET 2024 MCQ

A transmitter of power 10 kW emits radio waves of wavelength 500 m . The number of photons emitted por second by the transmitter of the order of

$10^{37}$

$10^{31}$

$10^{25}$

$10^{43}$

Question 19: Palette 19/35

AP-EAPCET 2024 MCQ

Which of the following produces electromagnetic waves?

Stationary charges

Charges in uniform motion

Accelerating charges

Stationary magnet

Question 20: Palette 20/35

AP-EAPCET 2024 MCQ

The average value of electric energy density in an electromagnetic wave is where $E_0$ is peak value

$\frac{E_0 E_{\pi m}^2}{4}$

$\frac{1}{2} \varepsilon_0 E_0^2$

$\frac{1}{2} e_0 E_0$

$\frac{1}{4} \varepsilon_0 E_0^2$

Question 21: Palette 21/35

AP-EAPCET 2024 MCQ

An electromagnetic wave travel in a medium with a speed of $2 \times 10^8 \mathrm{~ms}^{-1}$. The relative permeability of the medium is 1 . Then, the relative permittivity is

1.75

2.28

2.75

Question 22: Palette 22/35

AP-EAPCET 2024 MCQ

A message signal of 3 kHz is used to modulate a carric signal frequency 1 MHz , using amplitude modulation. The upper side band frequency and band width respectively are

1.003 MHz and 6 kHz

0.997 MHz and 6 kHz

1.003 MHz and 3 kHz

1.003 MHz and 2 MHz

Question 23: Palette 23/35

AP-EAPCET 2024 MCQ

The solar radiation is

stationary wave

mechanical wave

transverse EM wave

longludinal EM wave

Question 24: Palette 24/35

AP-EAPCET 2022 MCQ

The magnetic field in a plane electromagnetic wave is given as $\mathbf{B}=\left(3 \times 10^{-7} \mathrm{~T}\right) \sin \left(3 \times 10^4 x+9 \times 10^{12} t\right) \hat{j}$

The electric field of this wave is given as

$90 \sin \left(3 \times 10^4 x+9 \times 10^{12} t\right) \hat{i} \mathrm{~Vm}^{-1}$

$90 \sin \left(3 \times 10^4 \mathrm{x}+9 \times 10^{12} t\right) \hat{\mathrm{k}} \mathrm{~Vm}^{-1}$

$45 \sin \left(3 \times 10^4 x+9 \times 10^{12} t\right) \hat{i} \mathrm{~Vm}^{-1}$

$45 \sin \left(3 \times 10^4 x+9 \times 10^{12} t\right) \hat{k} \mathrm{~Vm}^{-1}$

Question 25: Palette 25/35

AP-EAPCET 2022 MCQ

Frequencies in the UHF range normally propagate by means of

Space waves

Surface waves

Ground waves

Sky waves

Question 26: Palette 26/35

AP-EAPCET 2022 MCQ

A light of intensity $12 \mathrm{Wm}^{-2}$ incidents on a black surface of area $4 \mathrm{~cm}^2$. The radiation pressure on the surface is

$1 \times 10^{-8} \mathrm{~Pa}$

$4 \times 10^{-8} \mathrm{~Pa}$

$1.6 \times 10^{-7} \mathrm{~Pa}$

$4.8 \times 10^{-7} \mathrm{~Pa}$

Question 27: Palette 27/35

AP-EAPCET 2022 MCQ

The electric field $(E)$ and magnetic field $(B)$ of an electromagnetic wave passing through vacuum are given by

$\begin{aligned} & E=E_0 \sin (k x-\omega t) \\ & B=B_0 \sin (k x-\omega t) \end{aligned}$

Then the correct statement among the following is

$E_0 k=B_0 \omega$

$E_0 \omega=B_0 k$

$E_0 B_0=\omega k$

$E_0 B_0=\frac{\omega}{k}$

Question 28: Palette 28/35

AP-EAPCET 2022 MCQ

A carrier wave is used to transmit a message signal. If the peak voltage of modulating signal and carrier signal are increased by $1 \%$ and $3 \%$ respectively, the modulation index is changed by

$-2\%$

$4\%$

$2\%$

$-4\%$

Question 29: Palette 29/35

AP-EAPCET 2022 MCQ

A plane electromagnetic wave travels in free space along $Z$-axis. At a particular point in space, the electric field along $X$-axis is $8.7 \mathrm{~Vm}^{-1}$. The magnetic field along $Y$-axis is

$2.9 \times 10^{-8} \mathrm{~T}$

$3 \times 10^{-6} \mathrm{~T}$

$8.7 \times 10^{-6} \mathrm{~T}$

$3 \times 10^{-5} \mathrm{~T}$

Question 30: Palette 30/35

AP-EAPCET 2022 MCQ

If the average power per unit area delivered by an electromagnetic wave is $9240 \mathrm{~Wm}^{-2}$. then the amplitude of the oscillating magnetic field in EM wave is

$4.4 ~\mu \mathrm{T}$

$6.6 ~\mu \mathrm{T}$

$8.8~ \mu \mathrm{T}$

$102 ~\mu \mathrm{T}$

Question 31: Palette 31/35

AP-EAPCET 2022 MCQ

A beam of light with intensity $10^{-3} \mathrm{~Nm}^{-2}$ and cross-sectional area $20 \mathrm{~cm}^2$ is incident on a fully reflective surface at angle $45^{\circ}$. Then, the force exerted by the beam on the surface is

$2.3 \times 10^{-15} \mathrm{~N}$

$1.33 \times 10^{-14} \mathrm{~N}$

$6.67 \times 10^{-15} \mathrm{~N}$

$9.4 \times 10^{-15} \mathrm{~N}$

Question 32: Palette 32/35

AP-EAPCET 2022 MCQ

The maximum number of TV signals, that can be transmitted along a co-axial cable is

100

125

140

Question 33: Palette 33/35

AP-EAPCET 2021 MCQ

The electric and the magnetic fields associated with an electromagnetic wave propagating along the $z$-axis, can be represented by

$\left[\mathrm{E}=E_0 \hat{\mathrm{i}}, \mathrm{B}=B_0 \hat{\mathrm{j}}\right]$

$\left[\mathrm{E}=E_0 \hat{\mathrm{k}}, \mathrm{B}=B_0 \hat{\mathrm{i}}\right]$

$\left[\mathrm{E}=E_0 \hat{\mathrm{j}}, \mathrm{B}=B_0 \hat{\mathrm{i}}\right]$

$\left[\mathrm{E}=E_0 \hat{\mathrm{j}}, \mathrm{B}=B_0 \hat{\mathrm{k}}\right]$

Question 34: Palette 34/35

AP-EAPCET 2021 MCQ

The magnetic field of a plane electromagnetic wave is given by $B=(400 \propto \mathrm{T})\sin \left[\left(4.0 \times 10^{15} \mathrm{~s}^{-1}\right)\left(t-\frac{x}{c}\right)\right]$. Average energy density corresponding to the electric field is

$8 \times 10^{-3} \mathrm{Jm}^{-3}$

$31.8 \times 10^{-3} \mathrm{Jm}^{-3}$

$80 \times 10^{-3} \mathrm{Jm}^{-3}$

$3.18 \times 10^{-3} \mathrm{Jm}^{-3}$

Question 35: Palette 35/35

AP-EAPCET 2021 MCQ

In an amplitude modulated signal, the maximum amplitude is $15 \mathrm{~V}$ and minimum amplitude is $5 \mathrm{~V}$. The amplitude of modulating wave will be

5 V

10 V

20 V

30 V

Question Status

Not Visited

Not Answered

Answered

Marked for Review

Question Palette