NEET Physics: Electromagnetic Waves — Practice Set 1 (15 MCQs)

NEET Physics: Electromagnetic Waves — Practice Set 1

Q1. An electromagnetic wave in vacuum has an electric field amplitude of \( 45 \, \text{V/m} \). What is the magnetic field amplitude? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

A. \( 1 \times 10^{-7} \, \text{T} \)
B. \( 1.2 \times 10^{-7} \, \text{T} \)
C. \( 1.3 \times 10^{-7} \, \text{T} \)
D. \( 1.5 \times 10^{-7} \, \text{T} \)

Q2. What type of electromagnetic waves did Hertz produce in his experiment?

A. Radio waves
B. Microwaves
C. Visible light
D. Gamma rays

Q3. In the electromagnetic spectrum, why are gamma rays associated with nuclear processes?

A. Low energy emission
B. Nuclear energy scales
C. Thermal emission
D. Visible spectrum

Q4. In a circuit with a capacitor, if the rate of change of electric flux is \( 2 \times 10^{11} \, \text{Vm/s} \), what is the displacement current? (Given \( \varepsilon_0 = 8.85 \times 10^{-12} \, \text{F/m} \))

A. 1.77 A
B. 0.885 A
C. 3.54 A
D. 4.42 A

Q5. Which type of electromagnetic waves are produced by the rapid acceleration and deceleration of electrons in aerials?

A. Microwaves
B. Radio waves
C. Infrared waves
D. Ultraviolet waves

Q6. What is the relationship between the amplitudes of electric and magnetic fields in an electromagnetic wave in vacuum? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

A. \( B_0 = \frac{E_0}{c} \)
B. \( E_0 = \frac{B_0}{c} \)
C. \( E_0 = B_0 c^2 \)
D. \( B_0 = E_0 c^2 \)

Q7. What is one environmental concern related to the depletion of the ozone layer mentioned in the document?

A. Increased infrared radiation
B. Reduced greenhouse effect
C. Excessive radio wave interference
D. Increased UV radiation exposure

Q8. Which frequency range corresponds to short wave bands used for radio communication?

A. \( 88 \, \text{MHz} \) to \( 108 \, \text{MHz} \)
B. \( 530 \, \text{kHz} \) to \( 1710 \, \text{kHz} \)
C. Up to \( 54 \, \text{MHz} \)
D. \( 4 \times 10^{14} \, \text{Hz} \) to \( 7 \times 10^{14} \, \text{Hz} \)

Q9. What is the wavelength range of infrared waves as per the document?

A. \( 400 \, \text{nm} \) to \( 0.6 \, \text{nmol} \)
B. \( 10 \, \text{nm} \) to \( 10^{-4} \, \text{nm} \)
C. \( > 0.1 \, \text{m} \)
D. \( 1 \, \text{mm} \) to \( 700 \, \text{nm} \)

Q10. Why are radio waves effective for long-distance communication?

A. Short wavelengths
B. High energy
C. Visible spectrum
D. Diffraction and reflection

Q11. Why are microwaves used in domestic microwave ovens?

A. They have long wavelengths
B. Their frequency matches water molecule resonance
C. They emit visible light
D. They are absorbed by air

Q12. An electromagnetic wave in vacuum has a wavelength of \( 12 \, \text{m} \). What is its frequency? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

A. \( 2 \times 10^7 \, \text{Hz} \)
B. \( 2.25 \times 10^7 \, \text{Hz} \)
C. \( 2.5 \times 10^7 \, \text{Hz} \)
D. \( 3 \times 10^7 \, \text{Hz} \)

Q13. What explains the effectiveness of infrared waves in remote sensing applications?

A. High frequency
B. Visible spectrum
C. Low penetration
D. Thermal interaction

Q14. In a charging capacitor, if the conduction current in the wires is \( 3 \, \text{A} \), what is the displacement current between the plates?

A. 3 A
B. 1.5 A
C. 6 A
D. 0 A

Q15. An electromagnetic wave in vacuum has a frequency of \( 60 \, \text{MHz} \). What is its wavelength? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

A. 2.5 m
B. 5 m
C. 7.5 m
D. 10 m

Physics — Electromagnetic Waves

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An electromagnetic wave in vacuum has an electric field amplitude of \( 45 \, \text{V/m} \). What is the magnetic field amplitude? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

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