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Access the latest Class 12 Physics MCQs for Chapter 8: Electromagnetic Waves, complete with answers. These MCQs are prepared according to the latest exam pattern to help students enhance their critical thinking skills and achieve excellent marks in board exams.
Class 12 Electromagnetic Waves MCQs
Here are 30 multiple-choice questions (MCQs) based on Chapter 8 of Class 12 Physics, focusing on Electromagnetic Waves. These questions cover various aspects of the chapter, helping students to better prepare for their exams.
Q. What is the phase difference between electric and magnetic fields in an electromagnetic wave?
a) 0
b) π
c) π/2
d) π/4
Answer: b
Q. Which of the following waves have a maximum frequency?
a) Infrared waves
b) Gamma rays
c) Microwaves
d) Radio waves
Answer: b
Q. According to Maxwell’s Hypothesis, a changing electric field gives rise to:
a) Induced EMF
b) Electric Field
c) Magnetic Field
d) Magnetic Dipole
Answer: c
Q. Which of the following proves that electromagnetic waves are transverse?
a) Reflection
b) Diffraction
c) Interference
d) Polarisation
Answer: d
Also Read: Electric Charges and Fields
Q. Which of the following is used to investigate the structure of solids?
a) Gamma Rays
b) Infrared Rays
c) X-Rays
d) Cosmic Rays
Answer: c
Q. Which of the following radiations are used to treat muscle ache?
a) Microwaves
b) Infrared Rays
c) Ultraviolet Rays
d) X-Rays
Answer: b
Q. When is the conduction current the same as the displacement current?
a) When the source is AC
b) When the source is DC
c) When the source is either an AC or a DC
d) When the source is neither DC nor AC
Answer: a
Also Read: Current Electricity
Q. What is the wavelength range of microwaves?
a) 0.1 gm to 0.7 gm
b) 1 mm to 1 m
c) 0.7 gm to 1 mm
d) None of these
Answer: b
Q. Maxwell in his famous equations of electromagnetism introduced the concept of:
a) AC current
b) Displacement current
c) Impedance
d) Reactance
Answer: b
Q. The ultra-high frequency band of radio waves in electromagnetic waves is used for:
a) Television waves
b) Cellular phone communication
c) Commercial FM radio
d) Both (a) and (c)
Answer: b
Q. Which of the following electromagnetic waves is used in medicine to destroy cancer cells?
a) IR-rays
b) Visible rays
c) Gamma rays
d) Ultraviolet rays
Answer: c
Q. Displacement current is the same as:
a) RMS current
b) Conduction current
c) Peak current
d) None of these
Answer: b
Read More: Communication System
Q. Which of the following statement is false for the properties of electromagnetic waves?
a) Both electric and magnetic field vectors attain maxima and minima at the same place and same time
b) The energy in electromagnetic waves is divided equally between electric and magnetic field vectors
c) Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave
d) These waves do not require any material medium for propagation
Answer: c
Q. Which of the following has/have zero average value in a plane electromagnetic wave?
a) Both magnetic and electric fields
b) Electric field only
c) Magnetic field only
d) None of these
Answer: a
Q. A charged particle oscillates about its mean equilibrium position with a frequency of 109Hz. The frequency of electromagnetic waves produced by the oscillator is:
a) 106 Hz
b) 107 Hz
c) 108 Hz
d) 109 Hz
Answer: d
Q. The wavelength of X-rays is of the order of:
a) 1 cm
b) 1 angstrom
c) 1 micron
d) 1 m
Answer: b
Q. The physical properties shared by both radiowaves and sound waves are:
a) Both can be polarised
b) Both can be reflected
c) Both can be diffracted
d) Both (b) and (c)
Answer: d
Q. The displacement current flows in the dielectric of the capacitor when the potential difference across its plates:
a) Changes (increases/decreases) with time
b) Changes with distance
c) Attains a constant value
d) None of these
Answer: a
Q. The waves used by artificial satellites for communication are:
a) Microwaves
b) Infrared waves
c) Radio waves
d) X-rays
Answer: a
Read More: Wave Optics
Q. The conduction current is the same as the displacement current when the source is:
a) AC only
b) DC only
c) Either AC or DC
d) Neither DC nor AC
Answer: c
Q. If a variable frequency AC source is connected to a capacitor, then with a decrease in frequency, the displacement current will:
a) Increase
b) Decrease
c) Remain constant
d) First decrease then increase
Answer: b
More Resources for Class 12
- NCERT Solutions Class 12
- NCERT Solutions Class 12 Maths
- NCERT Solutions Class 12 Physics
- NCERT Solutions Class 12 Chemistry
- NCERT Solutions Class 12 Biology
Q. An electromagnetic wave can be produced when a charge is:
a) Moving with a constant velocity
b) Moving in a circular orbit
c) Falling in an electric field
d) Both (b) and (c)
Answer: d
Q. The wavelength of infrared rays is:
a) Less than that of visible light
b) Greater than that of visible light
c) Greater or lesser depending on the source
d) None of these
Answer: b
