Multiple Choice Questions (MCQs) for JEE Physics: Electromagnetic Waves
Explore reliable objective questions for Electromagnetic Waves tailored for JEE learners. Utilizing these Physics multiple-choice formats ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.
Practice Electromagnetic Waves MCQs for JEE Physics
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Multiple Choice Questions
(a) power is transmitted along the magnetic field
(b) power is transmitted along the electric field
(c) power is equally transferred along the electric and magnetic fields
(d) power is transmitted in a direction perpendicular to both the fields
Show Answer & Explanation
Answer: (d) power is transmitted in a direction perpendicular to both the fields
Explanation:
1. The Poynting vector E x B is perpendicular to both E and B.
Teacher's Note:
1. Recall the basic fact.
(a) infrared
(b) ultraviolet
(c) microwaves
(d) cosmic rays
Show Answer & Explanation
Answer: (c) microwaves
Explanation:
1. Microwaves are used for satellite and mobile communication.
Teacher's Note:
1. Recall the basic fact.
(a) 1 metre
(b) 1 cm
(c) 1 micron
(d) 1 angstrom
Show Answer & Explanation
Answer: (d) 1 angstrom
Explanation:
1. X-ray wavelengths are about 0.1 Å to 100 Å.
Teacher's Note:
1. Recall the basic fact.
(a) 10 Å to 100 Å
(b) 4000 Å to 8000 Å
(c) 8000 Å to 10,000 Å
(d) 10,000 Å to 15,000 Å
Show Answer & Explanation
Answer: (b) 4000 Å to 8000 Å
Explanation:
1. Visible light spans about 4000 Å to 7800 Å.
Teacher's Note:
1. Recall the basic fact.
(a) alternating current
(b) direct current
(c) conduction current
(d) displacement current
Show Answer & Explanation
Answer: (c) conduction current
Explanation:
1. Current carried by moving charges in conductors is conduction current.
Teacher's Note:
1. Recall the basic fact.
(a) only radio waves
(b) only visible light
(c) only gamma rays
(d) X-rays and ultraviolet rays
Show Answer & Explanation
Answer: (d) X-rays and ultraviolet rays
Explanation:
1. The ozone layer shields the earth from harmful ultraviolet and X-rays.
Teacher's Note:
1. Recall the basic fact.
(a) gamma rays
(b) beta rays
(c) alpha rays
(d) X-rays
Show Answer & Explanation
Answer: (a) gamma rays
Explanation:
1. Among the electromagnetic radiations, gamma rays have the shortest wavelength.
Teacher's Note:
1. Recall the basic fact.
(a) are transverse in nature
(b) travel in free space at the speed of light
(c) are produced by accelerating charges
(d) travel in all media with the same speed
Show Answer & Explanation
Answer: (d) travel in all media with the same speed
Explanation:
1. In a medium the speed is 1/√(με), which differs from c.
Teacher's Note:
1. Recall the basic fact.
Assertion (A): Electromagnetic waves interact with matter and set up oscillations.
Reason (R): The interaction is independent of the wavelength of the electromagnetic waves.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation
Answer: (c) A is true, but R is false.
Explanation:
1. The waves exert forces on charges and set them oscillating, so the assertion is true.
2. The interaction depends strongly on the wavelength, so the reason is false.
Teacher's Note:
1. Interaction depends on frequency.
(a) 3.1 × 10⁻⁸ T
(b) 3 × 10⁻⁵ T
(c) 3 × 10⁻⁶ T
(d) 9.3 × 10⁻⁶ T
Show Answer & Explanation
Answer: (a) 3.1 × 10⁻⁸ T
Explanation:
1. B = E/c = 9.3/(3 × 10⁸) = 3.1 × 10⁻⁸ T.
Teacher's Note:
1. Recall the basic fact.
| Column I | Column II |
|---|---|
| (A) Energy associated with an electromagnetic wave (energy density) | (1) 1/√(με) |
| (B) Radiation pressure | (2) u/c |
| (C) Speed of an e.m. wave in a medium | (3) (1/2)ε₀E² + (1/2)B²/μ₀ |
| (D) Displacement current | (4) I_D = ε₀ dφ_E/dt |
(a) A-3, B-1, C-2, D-4
(b) A-2, B-3, C-1, D-4
(c) A-3, B-2, C-1, D-4
(d) A-3, B-4, C-1, D-2
Show Answer & Explanation
Answer: (c) A-3, B-2, C-1, D-4
Explanation:
1. The energy density is (1/2)ε₀E² + B²/(2μ₀) (A-3).
2. Radiation pressure for an absorbed wave is u/c (B-2).
3. The speed in a medium is 1/√(με) (C-1).
4. I_D = ε₀ dφ_E/dt (D-4).
Teacher's Note:
1. Standard e.m.
2. wave expressions.
(a) \( \varepsilon_0\,d\phi_E/dt \)
(b) \( \frac{\varepsilon_0}{R}\,d\phi_E/dt \)
(c) \( \varepsilon_0E/R \)
(d) \( \varepsilon_0qC/R \)
Show Answer & Explanation
Answer: (a) \( \varepsilon_0\,d\phi_E/dt \)
Explanation:
1. I_d = ε₀ dφ_E/dt.
Teacher's Note:
1. Recall the basic fact.
(a) the troposphere
(b) the ionosphere
(c) the stratosphere
(d) the mesosphere
Show Answer & Explanation
Answer: (c) the stratosphere
Explanation:
1. The ozone layer in the stratosphere absorbs most of the UV.
Teacher's Note:
1. Recall the basic fact.
(a) infrared rays
(b) ultraviolet rays
(c) microwaves
(d) gamma rays
Show Answer & Explanation
Answer: (d) gamma rays
Explanation:
1. Gamma rays have the highest frequency and the shortest wavelength.
Teacher's Note:
1. Recall the basic fact.
(a) \( \vec E=E_0\hat i,\ \vec B=B_0\hat j \)
(b) \( \vec E=E_0\hat k,\ \vec B=B_0\hat i \)
(c) \( \vec E=E_0\hat j,\ \vec B=B_0\hat i \)
(d) \( \vec E=E_0\hat j,\ \vec B=B_0\hat k \)
Show Answer & Explanation
Answer: (a) \( \vec E=E_0\hat i,\ \vec B=B_0\hat j \)
Explanation:
1. E x B must point along +z.
2. i x j = k, so E along i and B along j is correct.
Teacher's Note:
1. Recall the basic fact.
(a) kω
(b) k/ω
(c) k²ω
(d) ω
Show Answer & Explanation
Answer: (b) k/ω
Explanation:
1. k = 2π/λ and ω = 2πc/λ, so k/ω = 1/c does not depend on the wavelength.
Teacher's Note:
1. Recall the basic fact.
(a) \( q_0\,2\pi\nu\sin2\pi\nu t \)
(b) \( -q_0\,2\pi\nu\sin2\pi\nu t \)
(c) \( q_0\,2\pi\sin\pi\nu t \)
(d) \( q_0\,\pi\nu\sin2\pi\nu t \)
Show Answer & Explanation
Answer: (b) \( -q_0\,2\pi\nu\sin2\pi\nu t \)
Explanation:
1. The displacement current equals the conduction current dq/dt.
2. dq/dt = -2πν q0 sin(2πνt).
Teacher's Note:
1. I_d = dq/dt.
(a) 2 m⁻¹
(b) 0.5 m⁻¹
(c) 6 m⁻¹
(d) 3 m⁻¹
Show Answer & Explanation
Answer: (a) 2 m⁻¹
Explanation:
1. k = ω/c = 6 × 10⁸/3 × 10⁸ = 2 m⁻¹.
Teacher's Note:
1. Recall the basic fact.
(a) infrared rays
(b) ultraviolet rays
(c) microwaves
(d) gamma rays
Show Answer & Explanation
Answer: (c) microwaves
Explanation:
1. Microwaves have wavelengths from about 1 mm to 30 cm.
Teacher's Note:
1. Recall the basic fact.
(a) UV rays
(b) visible light
(c) radio waves
(d) microwaves
Show Answer & Explanation
Answer: (c) radio waves
Explanation:
1. Radio waves have the longest wavelengths in the e.m. spectrum.
Teacher's Note:
1. Recall the basic fact.
(a) conduction current
(b) displacement current
(c) both conduction and displacement current
(d) none of these
Show Answer & Explanation
Answer: (c) both conduction and displacement current
Explanation:
1. Maxwell's modified Ampere's law includes both conduction and displacement currents.
Teacher's Note:
1. Recall the basic fact.
(a) 0.25
(b) 0.5
(c) 0.75
(d) 1
Show Answer & Explanation
Answer: (a) 0.25
Explanation:
1. c = 1/√(μ₀ε₀) = 1/√16 = 0.25.
Teacher's Note:
1. Recall the basic fact.
(a) 0 rad
(b) 3π/2 rad
(c) π/2 rad
(d) π rad
Show Answer & Explanation
Answer: (d) π rad
Explanation:
1. The space current lags the field by 90° while the displacement current leads it by 90°.
2. The phase difference is π.
Teacher's Note:
1. Recall the basic fact.
(a) I only
(b) II only
(c) I and II only
(d) I, II and III
Show Answer & Explanation
Answer: (d) I, II and III
Explanation:
1. All three statements are correct.
Teacher's Note:
1. Recall the basic fact.
(a) a bolometer
(b) point contact diodes
(c) thermopiles
(d) the eye
Show Answer & Explanation
Answer: (b) point contact diodes
Explanation:
1. Point contact diodes are used as microwave detectors.
Teacher's Note:
1. Recall the basic fact.
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Multiple Choice Questions (MCQs) for JEE Physics Electromagnetic Waves
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FAQs
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