Electromagnetic Waves Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is one environmental concern related to the depletion of the ozone layer mentioned in the document?

The document mentions that the depletion of the ozone layer by chlorofluorocarbons (CFCs) allows more UV radiation to reach Earth, posing health risks.

Increased infrared radiation
Reduced greenhouse effect
Excessive radio wave interference
Increased UV radiation exposure
4

Which type of electromagnetic waves are emitted by hot bodies and molecules?

The document states that infrared waves are produced by hot bodies and molecules, often referred to as heat waves.

Ultraviolet waves
Infrared waves
Microwaves
Radio waves
2

A capacitor in a circuit has a conduction current of \( 1.8 \, \text{A} \) in the wires. What is the displacement current between the plates?

The document states that in a charging capacitor, the displacement current between the plates equals the conduction current in the wires, so \( i_d = 1.8 \, \text{A} \).

1.8 A
0.9 A
3.6 A
0 A
1

In the electromagnetic spectrum, what distinguishes gamma rays as particularly penetrating?

Gamma rays have extremely short wavelengths (high frequencies), resulting in very high energy, which allows them to penetrate deeply through materials, including dense substances.

Long wavelength
High energy
Low frequency
Medium dependence
2

What is the typical wavelength range of gamma rays as per the electromagnetic spectrum?

The document states that gamma rays have wavelengths from about \( 10^{-10} \, \text{m} \) to less than \( 10^{-14} \, \text{m} \).

\( 400 \, \text{nm} \) to \( 0.6 \, \text{nm} \)
\( 10 \, \text{nm} \) to \( 10^{-4} \, \text{nm} \)
\( 10^{-10} \, \text{m} \) to \( 10^{-14} \, \text{m} \)
\( > 0.1 \, \text{m} \)
3

An electromagnetic wave has a wave number \( k = 1 \, \text{rad/m} \). What is its wavelength in vacuum?

The wave number \( k = \frac{2 \pi}{\lambda} \). Given \( k = 1 \, \text{rad/m} \), we have \( \lambda = \frac{2 \pi}{k} = \frac{2 \pi}{1} \approx 6.28 \, \text{m} \).

3.14 m
6.28 m
9.42 m
12.56 m
2

Which frequency range includes TV waves according to the document?

The document states that TV waves range from \( 54 \, \text{MHz} \) to \( 890 \, \text{MHz} \).

\( 530 \, \text{kHz} \) to \( 1710 \, \text{kHz} \)
\( 88 \, \text{MHz} \) to \( 108 \, \text{MHz} \)
\( 54 \, \text{MHz} \) to \( 890 \, \text{MHz} \)
\( 4 \times 10^{14} \, \text{Hz} \) to \( 7 \times 10^{14} \, \text{Hz} \)
3

Which type of electromagnetic waves are produced by special vacuum tubes like klystrons and magnetrons?

The document mentions that microwaves are produced by special vacuum tubes such as klystrons and magnetrons.

Radio waves
Microwaves
Infrared waves
Ultraviolet waves
2

Which of Maxwell's equations relates the electric field to the rate of change of magnetic flux?

Faraday's Law in Maxwell's equations states \( \oint \mathbf{E} \cdot \mathrm{d} \mathbf{l} = -\frac{\mathrm{d} \Phi_B}{\mathrm{d} t} \), describing the induction of an electric field by a changing magnetic field.

Faraday's Law
Gauss's Law for electricity
Ampere-Maxwell Law
Gauss's Law for magnetism
1

What protects the Earth from most of the sun's ultraviolet radiation?

The document states that the ozone layer absorbs most of the ultraviolet radiation from the sun at an altitude of about \( 40-50 \, \text{km} \).

Cloud cover
Greenhouse gases
Ozone layer
Magnetic field
3

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