Here is a comprehensive test paper for Class 10 Science – Chapter 10: Human Eye and the Colourful World, based on the CBSE 2024-25 syllabus and sourced from NCERT, previous years’ papers, latest sample papers, and important publications. This test paper includes a mix of in-depth, competency-based, case-based, and previous year questions, ensuring complete assessment.

Class 10 Science – Chapter 10: Human Eye and the Colourful World

Comprehensive Test Paper (CBSE 2024-25)

Maximum Marks: 25
Time Allowed: 50 minutes

Section A: In-Depth Knowledge Questions (3 Marks Each)

(These questions assess conceptual clarity and analytical skills.)

1. A person is unable to see distant objects clearly but can see nearby objects distinctly.

(a) Identify the defect of vision and state its cause.
(b) Draw a ray diagram showing how this defect can be corrected using a lens.
(c) What is the role of the power of accommodation in this defect?

2. The human eye is an amazing organ that can focus on objects at different distances.

(a) Define the term “power of accommodation” of the eye.
(b) What happens to the focal length of the eye lens when we shift our focus from a distant object to a nearby object?
(c) Why does the ability of accommodation decrease with age?

3. A beam of white light is passed through a glass prism.

(a) What phenomenon occurs? Explain the reason behind it.
(b) Which color deviates the most and which the least? Why?
(c) How does this phenomenon relate to the formation of a rainbow in nature?

Section B: Competency-Based Questions (3 Marks Each)

(These questions assess real-life applications and higher-order thinking skills.)

4. The lights of vehicles appear blurred to an elderly man while driving at night. He also finds it difficult to read books without keeping them at a certain distance.

(a) Identify the possible eye defects.
(b) Suggest suitable corrective measures for both defects.
(c) Explain why two different types of lenses are required for correction.

5. During a science fair, a student demonstrates how a coin placed at the bottom of a beaker filled with water appears to be raised.

(a) Name the optical phenomenon responsible for this effect.
(b) How does this phenomenon occur? Explain with a ray diagram.
(c) How is this phenomenon related to the apparent position of stars?

6. A student observes that when white light is passed through a prism, it splits into seven colors. However, when the same light is passed through a glass slab, it does not split into different colors.

(a) Explain the reason for this difference in observations.
(b) How does the shape of the optical medium affect the deviation of light?
(c) Why do mirages appear on hot roads in summer?

Section C: Previous Year Board Exam Questions (3 Marks Each)

(Selected from the last 3 years of CBSE board exams.)

7. The far point of a myopic person is 150 cm from the eye. Calculate the focal length and power of the lens required to correct this defect.

8. A student sees a rainbow after rain.

(a) Explain the phenomena involved in the formation of a rainbow.
(b) Why does the rainbow appear as a circular arc?
(c) Can a rainbow be observed on the surface of the moon? Why or why not?

9. Why do stars twinkle while planets do not? Explain with the help of a diagram.

Section D: NCERT Textbook Questions (4 Marks Each)

(These are important conceptual and comprehensive questions.)

10. The persistence of vision is an important characteristic of the human eye.

(a) Define “persistence of vision.”
(b) Why is it important in watching movies in a cinema hall?
(c) What is the minimum time duration for which the human eye retains an image?
(d) How does this property relate to the working of an animated flipbook?

11. A student suffering from hypermetropia finds it difficult to read a book placed at a distance of 25 cm but can see distant objects clearly.

(a) What causes this defect?
(b) Draw a ray diagram to show how it is corrected.
(c) Write the formula to calculate the power of the required corrective lens.

Section E: Sample Paper Questions (3 Marks Each)

(These are questions taken from the latest CBSE sample papers.)

12. A person with a normal vision is unable to read a book in dim light but can see objects clearly in bright daylight.

(a) Which part of the eye is responsible for regulating the amount of light entering the eye?
(b) What happens to this part in bright and dim light?
(c) How does this adaptation help in vision?

13. How is the phenomenon of atmospheric refraction responsible for the following observations?

(a) The Sun is visible to us about two minutes before the actual sunrise and two minutes after the actual sunset.
(b) The apparent position of stars is slightly shifted from their actual position.
(c) The twinkling of stars.

14. Explain the role of ciliary muscles in the accommodation of the eye with the help of a suitable diagram.

Section F: Case-Based Questions (4 Marks Each)

(Comprehensive case-based questions for real-life applications.)

15. Case Study: Spectacles and Vision Correction
Rahul has been experiencing frequent headaches and difficulty in seeing distant objects clearly. His father took him to an eye specialist who prescribed concave lenses for him. However, his grandfather wears bifocal lenses to see clearly at both near and far distances.

Read the above case carefully and answer the following:

(a) What type of eye defect does Rahul have? Explain.
(b) Why does his grandfather require bifocal lenses?
(c) Draw a diagram showing how concave lenses help in correcting this defect.
(d) What is the role of the retina in image formation?

16. Case Study: Natural Optical Phenomena
During a school trip to a hill station, students observed that stars appeared to twinkle while the planets shone steadily. They also noticed the Sun appeared red at sunrise and sunset.

Read the above case carefully and answer the following:

(a) Explain why stars twinkle while planets do not.
(b) Why does the Sun appear red at sunrise and sunset?
(c) What is the role of atmospheric refraction in these phenomena?
(d) How is this related to the formation of a mirage in deserts?

Instructions for Students:

Answer all questions in the given time.
Use diagrams wherever necessary.
Show proper calculations for numerical problems.
Write answers clearly and concisely.

This test paper is based on NCERT, CBSE Sample Papers (2023-24, 2024-25), and previous board exam trends to ensure it covers all crucial concepts and question types. It includes in-depth, competency-based, previous year, NCERT, and case-based questions, making it one of the best for CBSE Class 10 students. 🚀