Physics MCQs

# Electromagnetic Radiation MCQs with Answers

Which of the following is true about electromagnetic radiation?
a) It requires a medium to travel through
b) It is a longitudinal wave
c) It consists of electric and magnetic fields oscillating perpendicular to each other
d) It can travel faster than the speed of light
Answer: c) It consists of electric and magnetic fields oscillating perpendicular to each other

What is the speed of electromagnetic radiation in a vacuum?
a) 3 x 10^5 meters per second
b) 3 x 10^8 meters per second
c) 3 x 10^10 meters per second
d) 3 x 10^12 meters per second
Answer: b) 3 x 10^8 meters per second

What is the term for the range of frequencies of electromagnetic radiation?
a) Spectrum
b) Wavefront
c) Wavelength
d) Polarization
Answer: a) Spectrum

Which of the following types of electromagnetic radiation has the longest wavelength?

b) X-rays
c) Visible light
d) Radio waves
Answer: d) Radio waves

What is the term for the distance between two consecutive wave crests or troughs of electromagnetic radiation?
a) Amplitude
b) Frequency
c) Wavelength
d) Velocity
Answer: c) Wavelength

Which of the following types of electromagnetic radiation has the highest frequency?
a) Gamma rays
b) X-rays
c) Visible light
d) Radio waves
Answer: a) Gamma rays

What is the unit of frequency?
a) Meters
b) Seconds
c) Hertz
d) Joules
Answer: c) Hertz

What is the term for the bending of electromagnetic waves as they pass from one medium to another?
a) Reflection
b) Refraction
c) Diffraction
d) Interference
Answer: b) Refraction

Which of the following types of electromagnetic radiation is commonly used in medical imaging?
a) Gamma rays
b) X-rays
c) Visible light
d) Infrared radiation
Answer: b) X-rays

What is the term for the phenomenon where electromagnetic waves encounter an obstacle or a slit and spread out?
a) Reflection
b) Refraction
c) Diffraction
d) Interference
Answer: c) Diffraction

Which of the following types of electromagnetic radiation is commonly used in wireless communication?
a) Gamma rays
b) X-rays
c) Visible light
d) Radio waves
Answer: d) Radio waves

What is the term for the bouncing back of electromagnetic waves when they encounter a surface?
a) Reflection
b) Refraction
c) Diffraction
d) Interference
Answer: a) Reflection

Which of the following types of electromagnetic radiation is commonly used in cooking and heating?
a) Gamma rays
b) X-rays
c) Visible light
d) Microwaves
Answer: d) Microwaves

What is the term for the superposition of two or more waves resulting in a new wave pattern?
a) Reflection
b) Refraction
c) Diffraction
d) Interference
Answer: d) Interference

Which of the following types of electromagnetic radiation is commonly used in remote control devices?
a) Gamma rays
b) X-rays
c) Infrared radiation
d) Ultraviolet radiation
Answer: c) Infrared radiation

What is the term for the range of colors that make up visible light?
a) Spectrum
b) Wavefront
c) Wavelength
d) Polarization
Answer: a) Spectrum

Which of the following types of electromagnetic radiation is commonly used in cancer treatment?
a) Gamma rays
b) X-rays
c) Visible light
d) Ultraviolet radiation
Answer: b) X-rays

What is the term for the splitting of white light into its component colors?
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion
Answer: d) Dispersion

Which of the following types of electromagnetic radiation is commonly used in security scanning?
a) Gamma rays
b) X-rays
c) Visible light
d) Terahertz radiation
Answer: b) X-rays

What is the term for the ability of a material to absorb and re-emit electromagnetic radiation?
a) Reflection
b) Refraction
c) Absorption
d) Transmission
Answer: c) Absorption

Which of the following types of electromagnetic radiation is commonly used in solar panels to generate electricity?
a) Gamma rays
b) X-rays
c) Visible light
d) Ultraviolet radiation
Answer: c) Visible light

What is the term for the change in direction of electromagnetic waves when they pass through a medium with a different refractive index?
a) Reflection
b) Refraction
c) Diffraction
d) Interference
Answer: b) Refraction

Which of the following types of electromagnetic radiation is commonly used in photography?
a) Gamma rays
b) X-rays
c) Visible light
d) Infrared radiation
Answer: c) Visible light

What is the term for the process by which electromagnetic waves pass through a material without being absorbed or scattered?
a) Reflection
b) Refraction
c) Absorption
d) Transmission
Answer: d) Transmission

Which of the following types of electromagnetic radiation is commonly used in the sterilization of medical equipment?
a) Gamma rays
b) X-rays
c) Visible light
d) Ultraviolet radiation
Answer: d) Ultraviolet radiation

What is the term for the emission of light from a material when it absorbs electromagnetic radiation?
a) Reflection
b) Refraction
c) Absorption
d) Fluorescence
Answer: d) Fluorescence

Which of the following types of electromagnetic radiation is commonly used in astronomy for studying celestial objects?
a) Gamma rays
b) X-rays
c) Visible light
d) Infrared radiation
Answer: c) Visible light

What is the term for the invisible electromagnetic radiation beyond the violet end of the visible spectrum?
a) Gamma rays
b) X-rays
c) Infrared radiation
d) Ultraviolet radiation
Answer: d) Ultraviolet radiation

Which of the following types of electromagnetic radiation is commonly used in laser technology?
a) Gamma rays
b) X-rays
c) Visible light
d) Microwaves
Answer: c) Visible light

What is the term for the process by which electromagnetic waves bounce off a surface without being absorbed or transmitted?
a) Reflection
b) Refraction
c) Absorption
d) Transmission
Answer: a) Reflection

Which of the following types of electromagnetic radiation is commonly used in satellite communication?
a) Gamma rays
b) X-rays
c) Visible light
d) Microwaves
Answer: d) Microwaves

What is the term for the emission of light from a material immediately after it stops being exposed to electromagnetic radiation?
a) Reflection
b) Refraction
c) Absorption
d) Phosphorescence
Answer: d) Phosphorescence

Which of the following types of electromagnetic radiation is commonly used in Wi-Fi communication?
a) Gamma rays
b) X-rays
c) Visible light
d) Radio waves
Answer: d) Radio waves

What is the term for the bending of electromagnetic waves around obstacles or through small openings?
a) Reflection
b) Refraction
c) Diffraction
d) Interference
Answer: c) Diffraction

Which of the following types of electromagnetic radiation is commonly used in thermal imaging?
a) Gamma rays
b) X-rays
c) Visible light
d) Infrared radiation
Answer: d) Infrared radiation

What is the term for the emission of light from a material immediately during exposure to electromagnetic radiation?
a) Reflection
b) Refraction
c) Absorption
d) Luminescence
Answer: d) Luminescence

Which of the following types of electromagnetic radiation is commonly used in television broadcasting?
a) Gamma rays
b) X-rays
c) Visible light
d) Radio waves
Answer: d) Radio waves

What is the term for the direction in which the electric and magnetic fields of an electromagnetic wave oscillate?
a) Frequency
b) Wavelength
c) Polarization
d) Velocity
Answer: c) Polarization

Which of the following types of electromagnetic radiation is commonly used in fiber-optic communication?
a) Gamma rays
b) X-rays
c) Visible light
d) Infrared radiation
Answer: c) Visible light

What is the term for the transfer of energy through electromagnetic waves?
a) Reflection
b) Refraction
c) Diffraction
d) Radiation
Answer: d) Radiation

Which of the following types of electromagnetic radiation is commonly used in barcode scanners?
a) Gamma rays
b) X-rays
c) Visible light
d) Infrared radiation
Answer: c) Visible light

What is the term for the study and application of electromagnetic radiation?
a) Electrostatics
b) Electromagnetism
c) Electrodynamics
d) Electromagnetics
Answer: d) Electromagnetics

Which of the following types of electromagnetic radiation is commonly used in GPS navigation systems?
a) Gamma rays
b) X-rays
c) Visible light
d) Radio waves
Answer: d) Radio waves

What is the term for the change in direction and velocity of electromagnetic waves when they pass through a medium with a different refractive index?
a) Reflection
b) Refraction
c) Diffraction
d) Interference
Answer: b) Refraction

Which of the following types of electromagnetic radiation is commonly used in airport security scanners?
a) Gamma rays
b) X-rays
c) Visible light
d) Terahertz radiation
Answer: d) Terahertz radiation

What is the term for the oscillation of electric and magnetic fields perpendicular to the direction of propagation of electromagnetic waves?
a) Amplitude
b) Frequency
c) Wavelength
d) Wavefront
Answer: a) Amplitude

Which of the following types of electromagnetic radiation is commonly used in night vision devices?
a) Gamma rays
b) X-rays
c) Visible light
d) Infrared radiation
Answer: d) Infrared radiation

What is the term for the arrangement of electromagnetic waves in a series of wave crests and troughs?
a) Reflection
b) Refraction
c) Diffraction
d) Wavefront
Answer: d) Wavefront

Which of the following types of electromagnetic radiation is commonly used in laser surgery?
a) Gamma rays
b) X-rays
c) Visible light
d) Ultraviolet radiation
Answer: c) Visible light

What is the term for the emission of light from a material immediately after it stops being exposed to electromagnetic radiation, but with a longer duration than fluorescence?
a) Reflection
b) Refraction
c) Absorption
d) Phosphorescence
Answer: d) Phosphorescence

Which of the following types of electromagnetic radiation is commonly used in satellite television?
a) Gamma rays
b) X-rays
c) Visible light
d) Radio waves
Answer: d) Radio waves

What is the term for the process by which electromagnetic waves are redirected as they encounter the edge of an obstacle?
a) Reflection
b) Refraction
c) Diffraction
d) Scattering
Answer: c) Diffraction

Which of the following types of electromagnetic radiation is commonly used in digital cameras?
a) Gamma rays
b) X-rays
c) Visible light
d) Infrared radiation
Answer: c) Visible light

What is the term for the ability of a material to allow electromagnetic waves to pass through it?
a) Reflection
b) Refraction
c) Absorption
d) Transmission
Answer: d) Transmission

Which of the following types of electromagnetic radiation is commonly used in barcode readers?
a) Gamma rays
b) X-rays
c) Visible light
d) Infrared radiation
Answer: c) Visible light

What is the term for the magnetic field component of electromagnetic waves?

b) Frequency
c) Wavelength
d) Magnetic field
Answer: d) Magnetic field

Which of the following types of electromagnetic radiation is commonly used in burglar alarms?
a) Gamma rays
b) X-rays
c) Visible light
d) Infrared radiation
Answer: d) Infrared radiation

What is the term for the process by which electromagnetic waves are redirected in multiple directions as they encounter small particles or irregularities?
a) Reflection
b) Refraction
c) Diffraction
d) Scattering
Answer: d) Scattering

Which of the following types of electromagnetic radiation is commonly used in wireless charging?
a) Gamma rays
b) X-rays
c) Visible light
d) Radio waves
Answer: d) Radio waves

What is the term for the region of space around a charged particle or a current-carrying wire where electromagnetic effects are observed?
a) Spectrum
b) Field
c) Wavelength
d) Polarization
Answer: b) Field

Which of the following types of electromagnetic radiation is commonly used in television remote controls?
a) Gamma rays
b) X-rays
c) Visible light
d) Infrared radiation
Answer: d) Infrared radiation

What is the term for the process by which electromagnetic waves are absorbed and re-emitted in random directions by atoms or molecules?
a) Reflection
b) Refraction
c) Diffraction
d) Scattering
Answer: d) Scattering

Which of the following types of electromagnetic radiation is commonly used in telecommunications?
a) Gamma rays
b) X-rays
c) Visible light
d) Radio waves
Answer: d) Radio waves

What is the term for the electric field component of electromagnetic waves?
a) Electric field
b) Frequency
c) Wavelength
d) Magnetic field
Answer: a) Electric field

Which of the following types of electromagnetic radiation is commonly used in remote sensing and satellite imaging?
a) Gamma rays
b) X-rays
c) Visible light
d) Microwave radiation
Answer: d) Microwave radiation

What is the term for the region of space around a charged particle or a current-carrying wire where electromagnetic effects are observed?
a) Spectrum
b) Field
c) Wavelength
d) Polarization
Answer: b) Field

Which of the following types of electromagnetic radiation is commonly used in optical communication?
a) Gamma rays
b) X-rays
c) Visible light
d) Infrared radiation
Answer: c) Visible light

What is the term for the change in direction of electromagnetic waves as they pass around the edges of an obstacle or through a small opening?
a) Reflection
b) Refraction
c) Diffraction
d) Interference
Answer: c) Diffraction

Which of the following types of electromagnetic radiation is commonly used in weather forecasting and radar systems?
a) Gamma rays
b) X-rays
c) Visible light
d) Microwave radiation
Answer: d) Microwave radiation

What is the term for the transfer of energy from one point to another through electromagnetic waves?
a) Reflection
b) Refraction
c) Diffraction
d) Radiation
Answer: d) Radiation