Free PDF Download of CBSE Class 12 Physics Assertion Reason Questions Chapter 8 Electromagnetic Waves. Assertion and Reason Questions for Class 12 Physics with Answers were Prepared Based on the Latest Exam Pattern. Students can solve NCERT Class 12 Physics Electromagnetic Waves to know their preparation level.
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Electromagnetic Waves Class 12 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below:
(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 and R is also false.
Assertion (A) : Radio waves cannot be diffracted by the buildings.
Reason (R) : The wavelength of radio waves is very small.
(d) A is false and R is also false
Assertion : Only microwaves are used in radar.
Reason : Because microwaves have very small wavelength.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A) : The electric field and magnetic field have equal average values in linearly polarised plane em wave.
Reason (R) : The electric energy and magnetic energy have equal average values in linearly polarised plane em wave
(b) Both A and R are true but R is not the correct explanation of A.
Assertion (A) : Light can travel in vacuum whereas sound cannot do so.
Reason (R) : Light has an electromagnetic wave nature whereas sound is mechanical wave.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A) : The microwaves are better carriers of signals than radio waves.
Reason (R) : The electromagnetic waves do not required any material medium for propagation
(b) Both A and R are true but R is not the correct explanation of A.
Assertion (A) : Velocity of light is constant in all media.
Reason (R) : Light is an electromagnetic wave which has constant velocity in all media.
(d) A is false and R is also false
Assertion (A) : X-rays in vacuum travel faster than light waves in vacuum.
Reason (R) : The energy of X-rays photon is less than that of light photon.
(d) A is false and R is also false
Assertion (A) : Electromagnetic waves exert pressure called radiation pressure.
Reason (R) : Electromagnetic waves carries energy.
(b) Both A and R are true but R is not the correct explanation of A.
Assertion (A) : Infrared waves sometimes referred as heat waves.
Reason (R) : Infrared waves heat up the earth surface.
(b) Both A and R are true but R is not the correct explanation of A.
Assertion (A) : X-ray astronomy is possible only from satellites orbiting the earth.
Reason (R) : Efficiency of X-rays telescope is large as compared to any other telescope
(c) A is true but R is false.
Assertion (A): Electromagnetic waves can travel through vacuum.
Reason (R): Electromagnetic waves do not require a medium for their propagation.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The speed of electromagnetic waves in a vacuum is constant and is denoted by ‘c’.
Reason (R): In a vacuum, electromagnetic waves travel at the speed of light, which is approximately 3.00 × 10^8 meters per second (m/s).
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Electromagnetic waves are transverse in nature.
Reason (R): In electromagnetic waves, the oscillations of the electric and magnetic fields are perpendicular to the direction of wave propagation.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The electromagnetic spectrum includes a wide range of waves, from radio waves to gamma rays.
Reason (R): Different types of electromagnetic waves have different wavelengths and frequencies.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The energy carried by an electromagnetic wave is directly proportional to its frequency.
Reason (R): The energy of an electromagnetic wave is directly related to the frequency of the oscillating electric and magnetic fields.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Electromagnetic waves can be polarized.
Reason (R): Polarization of electromagnetic waves refers to aligning the oscillations of electric and magnetic fields in a particular direction.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Electromagnetic waves are produced by the motion of charged particles.
Reason (R): Accelerating charged particles generate changing electric and magnetic fields, leading to the production of electromagnetic waves.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The electromagnetic waves used for communication are typically in the microwave and radio wave regions.
Reason (R): Microwaves and radio waves have longer wavelengths, allowing for long-distance transmission and reception.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The energy carried by electromagnetic waves is quantized in discrete packets called photons.
Reason (R): Photons are fundamental particles that carry discrete amounts of energy proportional to the frequency of the electromagnetic wave.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Electromagnetic waves can undergo interference and diffraction.
Reason (R): Interference and diffraction are wave phenomena, and since electromagnetic waves exhibit wave-like properties, they can experience these effects.
Answer: (a) Both A and R are true and R is the correct explanation of A.
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