Last Updated on August 30, 2024 by XAM CONTENT
Hello students, we are providing case study questions for class 10 science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 10 science. In this article, you will find case study questions for cbse class 10 science chapter 11 The Human Eye and the Colourful World.
| Chapter | The Human Eye and the Colourful World |
| Type of Questions | Case Study Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 10 |
| Subject | Science |
| Useful for | Class 10 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 10 Science Chapterwise Case Study |
Case Study Questions on The Human Eye and the Colourful World
Questions
Question 1:
Read the following and answer the questions given below:
Light of all the colour travel at the same speed in vacuum for all wavelengths. But in any transparent medium (glass or water), the light of different colours travel with different speeds for different wavelength that means that the refractive index of a particular medium is different for different wavelength. As there is a difference in their speeds, the light of different colour bend through different angles. The speed of violet colour is maximum and the speed of red colour is minimum in glass so, the red light deviates least and violet colour deviates most. Hence, higher the wavelength of a colour of light, smaller the refractive index and less is the bending of light.
λr > λv and rn < vn. Also frequency, ν = c/λ.
(i) Which of the following statements is correct regarding the propagation of light of different colours of white light in air?
(a) Red light moves fastest.
(b) Blue light moves faster than green light.
(c) All the colours of the white light move with the same speed.
(d) Yellow light moves with the mean speed as that of the red and the violet light.
Difficulty Level: Medium
Ans. Option (c) is correct.
Explanation: All the colours of the white light move with the same speed in air.
(ii) Which of the following is the correct order of wavelength?
(a) Red > Green > Yellow
(b) Red > Violet > Green
(c) Yellow > Green > Violet
(d) Red > Yellow > Orange
Difficulty Level: Easy
Ans. Option (c) is correct.
Explanation: The increasing order of wavelength of visible spectrum is
Violet < Indigo < Blue < Green < Yellow < Orange < Red So, the correct order is Yellow > Green > Violet
(iii) Which of the following is the correct order of speed of light in glass?
(a) Red > Green > Blue
(b) Blue > Green > Red
(c) Violet > Red > Green
(d) Green > Red > Blue
Ans. Option (b) is correct.
Explanation: The more be the wavelength, more be the speed.
Difficulty Level: Medium
(iv) Which colour which has maximum frequency
(a) Red
(b) Violet
(c) Blue
(d) Green
Difficulty Level: Easy
Ans. Option (b) is correct.
Explanation: Frequency is inversely proportional to the wavelength. Violet has minimum wavelength among all these colours, so violet has maximum frequency.
(v) Which of the following is the correct order of angle of deviation?
(a) Red > Green > Blue
(b) Blue > Yellow > Orange
(c) Orange > Red > Green
(d) Blue > Green > Violet
Difficulty Level: Medium
Ans. Option (b) is correct.
Explanation: The angle of deviation is more for more refractive index.
Question 2:
Read the following and answer the questions given below:
The spreading of light by the air molecules is called scattering of light. The light having least wavelength scatters more. The sun appears red at sunrise and sunset, appearance of blue sky it is due to the scattering of light. The colour of the scattered light depends on the size of particles. The smaller the molecules in the atmosphere scatter smaller wavelengths of light. The amount of scattering of light depends on the wavelength of light. When light from sun enters the earth’s atmosphere, it gets scattered by the dust particles and air molecules present in the atmosphere. The path of sunlight entering in the dark room through a fine hole is seen because of scattering of the sun light by the dust particles present in its path inside the room.
(i) To an astronaut in a spaceship, the colour of earth appears
(a) red
(b) blue
(c) white
(d) black
Difficulty Level: Medium
Ans. Option (b) is correct.
Explanation: Light is scattered by the air molecules present in atmosphere.
(ii) At the time of sunrise and sunset, the light from sun has to travel.
(a) longest distance of atmosphere
(c) both (a) and (b)
(b) shortest distance of atmosphere
(d) can’t say
Difficulty Level: Medium
Ans. Option (a) is correct.
Explanation: As the distance between us and sun is more at the time of sunrise and sunset.
(iii) The colour of sky appears blue, it is due to the
(a) refraction of light through the atmosphere
(b) dispersion of light by air molecules
(c) scattering of light by air molecules
(d) all of these.
Difficulty Level: Medium
Ans. Option (c) is correct.
Explanation: Due to the more scattering of blue colour by molecules of air.
(iv) At the time of sunrise and sunset
(a) Blue colour scattered and red colour reaches our eye
(b) Red colour scattered and blue colour reaches our eye
(c) Green and blue scattered and orange reaches our eye
(d) None of these
Difficulty Level: Medium
Ans. Option (a) is correct.
Explanation: Red light being of largest wavelength blue scatter more, red scattered least.
(v) The danger signs made red in colour, because
(a) the red light can be seen from farthest distance
(b) the scattering of red light is least
(c) both (a) and (b)
(d) none of these
Difficulty Level: Medium
Ans. Option (c) is correct.
Explanation: Scattering is least but velocity of red light is more.
Also check
- Electricity Class 10 Case Study Questions Science Chapter 12
- The Human Eye and the Colourful World Class 10 Case Study Questions Science Chapter 11
- Metals and Non-metals Class 10 Case Study Questions Science Chapter 3
- Light – Reflection and Refraction Class 10 Case Study Questions Science Chapter 10
- Life Processes Class 10 Case Study Questions Science Chapter 6
- Acids Bases and Salts Class 10 Case Study Questions Science Chapter 2
- Chemical Reactions and Equations Class 10 Case Study Questions Science Chapter 1
Topics from which case study questions may be asked
- Structure of the Human Eye
- Functioning of the Eye
- Defects of Vision and Their Correction
- Prism and the Refractive Index
- Dispersion of Light
- Atmospheric Refraction
- Scattering of Light
Case study questions from the above topics may be asked.
Helpful Links for CBSE Class 10 Science Preparation
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Frequently Asked Questions (FAQs) on The Human Eye and the Colourful World Case Study Questions
Q1: What are case study questions for CBSE examinations?
A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.
Q2: Why are case study questions important for understanding class 10 science chapters?
A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.
Q3: How should students approach answering case study questions for CBSE?
A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of chemical reactions and equations, and formulate well-supported solutions or responses.
Q4: Are there any resources available online for students to practice case study questions on class 10 science chapters for CBSE exams?
A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our website to access these questions and enhance your learning experience. If you need more case study questions for your preparation, then you visit Physics Gurukul website.
Q5: How can students effectively prepare for case study questions on The Human Eye and the Colourful World for CBSE exams?
A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.
Q6: How can teachers incorporate case study questions on The Human Eye and the Colourful World class 10 science into classroom teaching?
A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of The Human Eye and the Colourful World.
Q7: What is the power of accommodation of a normal eye?
Ans. A normal eye has a power of accommodation which enables objects as far as infinity and as close as 25 cm to be focussed on the retina.
Q8: What is meant by spherical aberration of a lens?
A8: The inability of a lens to bring all the rays coming from a point object to focus at a single point is known as spherical
aberration.
Q9: Is the focal length of our eye lens fixed?
A9: No
Q10: What is astigmatism? How is it corrected?
A10: It is that defect of the eye due to which the image of a distant point source of light is formed, not as a point but as a vertical or a horizontal line. It can be corrected by using cylindrical lenses.
Q11: White light consists of seven colours. Is the refractive index of glass same for all colours?
A11: The refractive index of glass is different for each of the colours.
Q12: When a monochromatic light passes through a prism, will it show dispersion?
A12: No, it will not show any dispersion but will show only deviation.
Q13: When does an object appear black?
A13: When it absorbs all the colours incident on it.
Q14: Why does a rose appear red in daylight?
A14: Because it reflects only red colour to our eye, out of all the seven colours of sun light falling on it.
