Download JEE MCQs for JEE Physics: Electromagnetic Waves
Review structured MCQ sets for JEE Physics Electromagnetic Waves. Built according to official JEE guidelines, these downloadable questions support daily revision and core concept reinforcement.
Chapter-wise Objective Questions: Electromagnetic Waves
Access the complete set of multiple-choice questions for Electromagnetic Waves below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official JEE textbooks.
Multiple Choice Questions
(a) ultraviolet rays
(b) infrared rays
(c) microwaves
(d) radio waves
Show Answer & Explanation
Answer: (b) infrared rays
Explanation:
1. Infrared photography records heat radiation and penetrates haze.
Teacher's Note:
1. Recall the basic fact.
(a) ultraviolet
(b) microwave
(c) infrared
(d) radio waves
Show Answer & Explanation
Answer: (c) infrared
Explanation:
1. Molecular vibrations have frequencies in the infrared region.
Teacher's Note:
1. Recall the basic fact.
Assertion (A): The displacement current in a parallel plate capacitor of capacitance C can be written as i_d = C dV/dt, where V is the potential difference between the plates.
Reason (R): The displacement current in free space is given by i_d = ε₀ dφ_E/dt.
(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: (a) Both A and R are true, and R is the correct explanation of A.
Explanation:
1. With φ_E = EA = VA/d and C = ε₀A/d, ε₀ dφ_E/dt = C dV/dt.
2. So the reason explains the assertion.
Teacher's Note:
1. Substitute φ = VA/d.
(a) increases as we move from gamma rays to radio waves
(b) decreases as we move from gamma rays to radio waves
(c) is the same for all of them
(d) none of these
Show Answer & Explanation
Answer: (c) is the same for all of them
Explanation:
1. In vacuum all e.m. waves travel at the same speed c.
Teacher's Note:
1. Recall the basic fact.
(a) travel with a speed larger than c
(b) have much larger wavelength than light
(c) are not electromagnetic waves
(d) none of these
Show Answer & Explanation
Answer: (b) have much larger wavelength than light
Explanation:
1. Diffraction is appreciable when the wavelength is comparable to the size of the obstacle.
Teacher's Note:
1. Recall the basic fact.
(a) 10⁻⁴ cm
(b) 10⁻⁵ cm
(c) 10⁻⁶ cm
(d) 10⁻⁷ cm
Show Answer & Explanation
Answer: (a) 10⁻⁴ cm
Explanation:
1. Infrared spans about 7 × 10⁻⁵ cm to 10⁻¹ cm, so 10⁻⁴ cm is infrared.
Teacher's Note:
1. Recall the basic fact.
Assertion (A): When a variable frequency a.c. source is connected to a capacitor, the displacement current increases with an increase in frequency.
Reason (R): As the frequency increases the conduction current also increases.
(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: (a) Both A and R are true, and R is the correct explanation of A.
Explanation:
1. I = 2πfCV increases with f.
2. The displacement current equals the conduction current in the circuit, so the reason explains the assertion.
Teacher's Note:
1. I is proportional to f.
| Column I | Column II |
|---|---|
| (A) Ultraviolet rays | (1) Satellite for army purposes |
| (B) Infrared rays | (2) Aircraft navigation in RADAR |
| (C) Microwave | (3) Television and cellular phones |
| (D) Radio wave | (4) Checking mineral samples |
(a) A-4, B-2, C-1, D-3
(b) A-4, B-1, C-3, D-2
(c) A-4, B-3, C-2, D-1
(d) A-4, B-1, C-2, D-3
Show Answer & Explanation
Answer: (d) A-4, B-1, C-2, D-3
Explanation:
1. Ultraviolet rays are used to check mineral samples (A-4).
2. Infrared rays are used in army satellite imaging (B-1).
3. Microwaves are used in RADAR (C-2).
4. Radio waves are used in TV and cellular communication (D-3).
Teacher's Note:
1. Uses follow from wavelength.
(a) the same wavelength but different velocities
(b) the same frequency but different velocities
(c) the same velocity but different wavelengths
(d) the same velocity and the same frequency
Show Answer & Explanation
Answer: (c) the same velocity but different wavelengths
Explanation:
1. All e.m. waves travel at c in vacuum, but differ in frequency and wavelength.
Teacher's Note:
1. Recall the basic fact.
(a) 20 kHz
(b) 2 kHz
(c) 2 MHz
(d) 1 MHz
Show Answer & Explanation
Answer: (c) 2 MHz
Explanation:
1. f = c/λ = 3 × 10⁸/150 = 2 × 10⁶ Hz = 2 MHz.
Teacher's Note:
1. Recall the basic fact.
(a) prevent infrared radiations from the sun reaching the earth
(b) prevent infrared radiations originated from the earth from escaping the atmosphere
(c) prevent ultraviolet rays from the sun
(d) reflect back radio waves
Show Answer & Explanation
Answer: (a) prevent infrared radiations from the sun reaching the earth
Explanation:
1. Ozone absorbs ultraviolet; it does not stop infrared from the sun.
Teacher's Note:
1. Recall the basic fact.
(a) 88 - 108 MHz
(b) 54 - 72 MHz
(c) 540 - 1600 kHz
(d) 840 - 935 MHz
Show Answer & Explanation
Answer: (d) 840 - 935 MHz
Explanation:
1. Cellular systems use the 840 - 935 MHz band.
Teacher's Note:
1. Recall the basic fact.
(a) does not change
(b) appears to increase
(c) appears to decrease
(d) sometimes appears to increase and sometimes decrease
Show Answer & Explanation
Answer: (c) appears to decrease
Explanation:
1. For a plasma ε_r = 1 - ω_p²/ω², which is less than 1.
Teacher's Note:
1. Recall the basic fact.
(a) the same direction but differ in phase by 90°
(b) the same direction and are in phase
(c) mutually perpendicular directions and are in phase
(d) mutually perpendicular directions and differ in phase by 90°
Show Answer & Explanation
Answer: (c) mutually perpendicular directions and are in phase
Explanation:
1. E and B are mutually perpendicular and in phase.
Teacher's Note:
1. Recall the basic fact.
(a) 4.58 × 10⁻⁶ J/m³
(b) 6.37 × 10⁻⁹ J/m³
(c) 81.35 × 10⁻¹² J/m³
(d) 3.3 × 10⁻³ J/m³
Show Answer & Explanation
Answer: (a) 4.58 × 10⁻⁶ J/m³
Explanation:
1. u_avg = ε₀ E_rms² = 8.85 × 10⁻¹² × 720² = 4.58 × 10⁻⁶ J/m³.
Teacher's Note:
1. Total energy density = ε₀ E_rms².
(a) ultraviolet waves
(b) X-rays
(c) gamma rays
(d) microwaves
Show Answer & Explanation
Answer: (c) gamma rays
Explanation:
1. Gamma rays have the smallest wavelength here.
Teacher's Note:
1. Recall the basic fact.
Assertion (A): Electromagnetic waves are transverse in nature.
Reason (R): The electric and magnetic fields in electromagnetic waves are perpendicular to each other and to the direction of propagation.
(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: (a) Both A and R are true, and R is the correct explanation of A.
Explanation:
1. The fields oscillate perpendicular to the direction of travel, which is what transverse means.
Teacher's Note:
1. Link the reason to the assertion.
(a) north
(b) east
(c) west
(d) downwards
Show Answer & Explanation
Answer: (b) east
Explanation:
1. E x B must point north.
2. With E up, B must be east.
Teacher's Note:
1. Use E x B along propagation.
(a) less than 3 × 10⁻⁷ m
(b) more than 3 × 10⁻⁷ m
(c) less than 3 × 10⁻⁵ m
(d) more than 3 × 10⁻⁵ m
Show Answer & Explanation
Answer: (a) less than 3 × 10⁻⁷ m
Explanation:
1. Ozone absorbs the harmful ultraviolet radiation, whose wavelength is less than about 300 nm.
Teacher's Note:
1. Recall the basic fact.
(a) X-rays
(b) ultraviolet rays
(c) radio waves
(d) microwaves
Show Answer & Explanation
Answer: (c) radio waves
Explanation:
1. An oscillating charge emits e.m. waves of its own frequency; 3 MHz is in the radio range.
Teacher's Note:
1. Recall the basic fact.
Assertion (A): The velocity of electromagnetic waves depends on the electric and magnetic properties of the medium.
Reason (R): The velocity of electromagnetic waves in free space is constant.
(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: (b) Both A and R are true, but R is not the correct explanation of A.
Explanation:
1. v = 1/√(με) in a medium, and in free space v = c is a constant.
2. Both are true, but the constancy in vacuum does not explain the dependence in a medium.
Teacher's Note:
1. Both true, not linked.
(a) it stops ultraviolet rays
(b) it reduces the greenhouse effect
(c) it reflects radio waves
(d) it controls O₂/H₂ radio in the atmosphere
Show Answer & Explanation
Answer: (a) it stops ultraviolet rays
Explanation:
1. The ozone layer absorbs harmful ultraviolet radiation from the sun.
Teacher's Note:
1. Recall the basic fact.
(a) wavelength and frequency both become half
(b) wavelength is doubled and frequency remains unchanged
(c) wavelength and frequency both remain unchanged
(d) wavelength is halved and frequency remains unchanged
Show Answer & Explanation
Answer: (d) wavelength is halved and frequency remains unchanged
Explanation:
1. The frequency is fixed by the source.
2. n = √ε_r = 2, so v = c/2 and the wavelength is halved.
Teacher's Note:
1. Recall the basic fact.
(a) v_s > v_x > v_m
(b) v_s < v_x < v_m
(c) v_s > v_x < v_m
(d) v_s = v_x = v_m
Show Answer & Explanation
Answer: (d) v_s = v_x = v_m
Explanation:
1. All e.m. waves travel at c in vacuum.
Teacher's Note:
1. Recall the basic fact.
(a) \( \vec E \)
(b) \( \vec B \)
(c) \( \vec B\times\vec E \)
(d) \( \vec E\times\vec B \)
Show Answer & Explanation
Answer: (d) \( \vec E\times\vec B \)
Explanation:
1. The wave travels along E x B (the Poynting vector).
Teacher's Note:
1. Recall the basic fact.
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Electromagnetic Waves Objective Questions & Solutions for JEE Physics
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FAQs
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