Free Printable QUIZ III - PHY 504

1.

In the context of a transverse pulse traveling on a stretched rope, what is the relationship between the direction of motion of element P and the direction of propagation?

a)

The direction of motion of element P is parallel to the direction of propagation.

b)

The direction of motion of element P is perpendicular to the direction of propagation.

c)

The direction of motion of element P is opposite to the direction of propagation.

d)

The direction of motion of element P is diagonal to the direction of propagation.

2.

Which of the following best describes the motion of a longitudinal wave?

a)

The wave causes the medium to move in the same direction as the wave's propagation.

b)

The wave causes the medium to move perpendicular to the wave's propagation.

c)

The wave causes the medium to move in a circular motion.

d)

The wave causes the medium to remain stationary while the wave propagates.

3.

What is the mathematical expression for the resultant wave when two waves interfere to form a standing wave?

a)

y = y₁ + y₂ = (2A sin kx) cos ωt

b)

y = y₁ + y₂ = (A sin kx) cos ωt

c)

y = y₁ + y₂ = (A cos kx) sin ωt

d)

y = y₁ + y₂ = (2A cos kx) sin ωt

4.

What is the distance between adjacent nodes in a standing wave?

a)

λ/2

b)

λ/4

c)

λ

d)

2λ

5.

What is the frequency of a traveling wave if the number of oscillations in one second is three and a half?

a)

2.5 Hz

b)

1.5 Hz

c)

3.5 Hz

d)

2 Hz

6.

What is the equation for the curl of the magnetic field in free space?

a)

$\vec{\nabla} \times \vec{B} = \mu_0 \vec{J} + \mu_0 \epsilon_0 \frac{\partial \vec{E}}{\partial t}$

b)

$\vec{\nabla} \times \vec{B} = \mu_0 \epsilon_0 \frac{\partial \vec{E}}{\partial t}$

c)

$\vec{\nabla} \times \vec{B} = \vec{\nabla} \cdot \vec{B} - \vec{\nabla}^2 \vec{B}$

d)

$\vec{\nabla} \times \vec{B} = \mu_0 \epsilon_0 \frac{\partial^2 \vec{B}}{\partial t^2}$

7.

What is the general form of the second-order differential wave equation?

a)

∇²ψ = 1/v² ∂²ψ/∂t²

b)

∇ψ = v² ∂ψ/∂t

c)

∇²ψ = v ∂ψ/∂t²

d)

∇ψ = 1/v² ∂ψ/∂t²

8.

What is the numerical value of the speed of electromagnetic wave in free space?

a)

3.0 × 10⁸ m/s

b)

2.5 × 10⁸ m/s

c)

3.5 × 10⁸ m/s

d)

4.5 × 10⁸ m/s

9.

Which range of electromagnetic spectra has highest wave length?

a)

X-Ray

b)

Micro-wave

c)

Visible Range

d)

Radio Wave

10.

What is the relationship between the electric field & magnetic field in an electromagnetic wave?

a)

The electric field and magnetic field are parallel to each other.

b)

The electric field and magnetic field are perpendicular to each other and the direction of propagation.

c)

The electric field and magnetic field are perpendicular to each other but parallel to the direction of propagation.

d)

The electric field and magnetic field are parallel to the direction of propagation.

11.

Which frequency range corresponds to visible light in the electromagnetic spectrum?

a)

$10^4$ Hz to $10^8$ Hz

b)

100 - 420 GHz

c)

430–770 THz

d)

1120 - 1320 PHz

12.

Which of the following material parameters primarily control electromagnetic (EM) wave propagation in a medium?

a)

Conductivity, Permeability, and Permittivity

b)

Density, Temperature, and Pressure

c)

Frequency, Wavelength, and Amplitude

d)

Resistance, Capacitance, and Inductance

13.

In a loss-less dielectric medium, what is the approximate value of conductivity (σ)?

a)

σ = 0

b)

σ ≈ 0

c)

σ ≠ 0

d)

σ ≈ ∞

14.

What is the characteristic of conductivity (σ) in a good conductor?

a)

σ = 0

b)

σ ≈ 0

c)

σ ≠ 0

d)

σ ≈ ∞

15.

In a lossy dielectric medium, how is permittivity (ε) expressed?

a)

ε = ε₀

b)

ε = ε₀εᵣ

c)

ε = ε₀μᵣ

d)

ε = μ₀εᵣ

16.

What does the Poynting's Vector represent?

a)

Instantaneous power density vector associated with gravitational field at a given point.

b)

Instantaneous power density vector associated with electro-magnetic field at a given point.

c)

Instantaneous power density vector associated with magnetic field at a given point.

d)

Instantaneous power density vector associated with electrical field at a given point.

17.

In the diagram, what does $\eta_2$ represent in the equation

a)

The intrinsic impedance of Medium 2

b)

The intrinsic impedance of Medium 1

c)

The reflection coefficient of the wave

d)

The propagation constant of the wave

18.

Define the corresponding Magnetic Field associated with the electric field $\overrightarrow{E}=E_0Sin\left(\omega t-\beta x\right)\overrightarrow{j}$

a)

$\overrightarrow{H}=H_0Sin\left(\omega t-\beta x\pm\phi\right)\overrightarrow{j}$

b)

$\overrightarrow{H}=H_0Sin\left(\omega t-\beta z\pm\phi\right)\overrightarrow{j}$

c)

$\overrightarrow{H}=H_0Sin\left(\omega t-\beta y\pm\phi\right)\overrightarrow{j}$

d)

$\overrightarrow{H}=H_0Sin\left(\omega t-\beta x\pm\phi\right)\overrightarrow{k}$

19.

An electromagnetic wave propagating in z-direction, with E field oscillating in X-axis and H field oscillating in Y-axis, reflecting from Z=0 interface, what would be reflected EM Field?

a)

Propagation along Z-direction, E field along X-axis, H field along Y-axis

b)

Propagation along (-Z)-direction, E field along -X-axis, H field along (-Y)-axis

c)

Propagation along (-Z)-direction, E field along X-axis, H field along (-Y)-axis

d)

Propagation along Z-direction, (-E) field along X-axis, H field along (-Y)-axis

20.

What is an electrostatic dipole?

a)

Two positive charges separated by a small distance

b)

Two negative charges separated by a small distance

c)

One positive and One negative charges separated by a small distance

d)

One positive and One negative charges separated by a large distance

QUIZ III - PHY 504 - AY 2025-26

Total questions: 20

Worksheet time: 10mins

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