Spectrum Assertion and Reasoning Questions for ICSE Class 10 Physics Chapter 6

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Last Updated on April 12, 2025 by sanjjeett

Hello students, we are providing assertion and reasoning questions for ICSE class 10 physics. Assertion and reasoning questions are the new question format that is introduced in CISCE (ICSE and ISC) board. The resources for ICSE assertion and reasoning questions are very less. So, to help icse board students we have created chapterwise assertion and reasoning questions for class 10 physics. In this article, you will find assertion and reasoning questions for ICSE Class 10 Physics Chapter 6 Spectrum.

Chapter	Spectrum
Type of Questions	Assertion and Reasoning Questions
Nature of Questions	Competency Based Questions
Board	ICSE
Class	10
Subject	Physics
Unit	Unit 2 Light
Useful for	Class 10 Studying Students
Answers provided	Yes
Difficulty level	Mentioned
Important Link	ICSE Class 10 Physics Chapterwise Assertion Reasoning

Assertion and Reasoning Questions on Spectrum for ICSE Class 10 Physics

Assertion and reasoning questions are also known as assertion reason questions. Assertion-Reason questions are a type of question format used in ICSE exams where two statements are provided: an Assertion (A) and a Reason (R). Students need to determine whether each statement is true or false and if the Reason correctly explains the Assertion.

Directions: Each question consists of two statements – an Assertion (A) and a Reason (R). Choose the correct option:
(a) Both assertion and reason are true.
(b) Both assertion and reason are false.
(c) Assertion is false but reason is true.
(d) Assertion is true but reason is false.

Q1.
Assertion (A): A prism splits white light into seven colours.
Reason (R): Different colours of light have different wavelengths and refract by different amounts.
Ans.: (a)

Q2.
Assertion (A): The red light deviates the most when white light passes through a prism.
Reason (R): Red light has the shortest wavelength.
Ans.: (b)

Q3.
Assertion (A): Dispersion does not occur in a glass slab.
Reason (R): In a glass slab, the emergent ray is parallel to the incident ray, and the deviation cancels out.
Ans.: (a)

Q4.
Assertion (A): Violet light bends the most while passing through a prism.
Reason (R): Violet light has the shortest wavelength and lowest speed in glass.
Ans.: (a)

Q5.
Assertion (A): The spectrum of sunlight contains seven distinct colours only.
Reason (R): The human eye cannot detect wavelengths beyond violet and red.
Ans.: (c)

Q6.
Assertion (A): A prism can form a spectrum only if the light source is white light.
Reason (R): White light consists of multiple wavelengths whereas monochromatic light does not.
Ans.: (a)

Q7.
Assertion (A): The deviation caused by a prism depends only on the angle of incidence.
Reason (R): Angle of deviation is independent of the angle of the prism and the refractive index.
Ans.: (b)

Q8.
Assertion (A): All colours of light travel at the same speed in a vacuum but not in glass.
Reason (R): In glass, different colours have different refractive indices.
Ans.: (a)

Q9.
Assertion (A): Dispersion and deviation are the same phenomenon.
Reason (R): Both refer to the bending of light in a prism.
Ans.: (d)

Q10.
Assertion (A): A monochromatic beam of light will not undergo dispersion through a prism.
Reason (R): All rays of a single wavelength deviate equally in the same medium.
Ans.: (a)

Q11.
Assertion (A): Light disperses in a prism because each colour has a different angle of incidence.
Reason (R): Different colours bend differently due to variation in wavelength, not incidence angle.
Ans.: (c)

Q12.
Assertion (A): The angle of deviation is minimum when the angle of incidence is minimum.
Reason (R): Minimum deviation occurs when the angle of incidence equals the angle of emergence.
Ans.: (c)

We hope the given ICSE assertion reasoning questions for Refraction Through a Lens helps you in your learning.

Also check

• Spectrum Assertion and Reasoning Questions for ICSE Class 10 Physics Chapter 6
• Refraction Through a Lens Assertion and Reasoning Questions for ICSE Class 10 Physics Chapter 5
• Refraction of Light at Plane Surfaces Assertion and Reasoning Questions for ICSE Class 10 Physics Chapter 4
• Machines Assertion and Reasoning Questions for ICSE Class 10 Physics Chapter 3
• Force Assertion and Reasoning Questions for ICSE Class 10 Physics Chapter 1
• Work, Energy and Power Assertion and Reasoning Questions for ICSE Class 10 Physics Chapter 2

Topics from which assertion reasoning questions may be asked

• Dispersion of light
• Spectrum – definition and formation
• Seven colours of white light (VIBGYOR)
• Cause of dispersion
• Refraction and dispersion by a prism
• Deviation produced by a prism
• Conditions for minimum deviation
• Applications of dispersion and spectrum

Assertion and reasoning questions based on above topics may be asked.

Topics found difficult by students

• Understanding the cause of dispersion
• Difference between refraction and dispersion
• Scattering of light
• Speed of light for all wavelengths in vacuum is the same.
• Most of the students are confused between the concept of dispersion and scattering

These are the topics from chapter Spectrum, generally found difficult by students studying in ICSE Class 10 Physics.

Frequently Asked Questions (FAQs) on Spectrum ICSE Class 10 Physics Assertion and Reasoning Questions