CBSE Class 10 Science 2024-25: Chapter 10 Human Eye and Colourful World Refraction Competency-Based Questions with Answers; Download Free PDF

As the CBSE Class 10 board exams get closer, it’s important for students to understand the new exam pattern. Starting in the 2024-25 school year, CBSE will include 50% more competency-based questions. These questions will be both multiple choice and written, focusing on how to use what students have learned in real-life situations.

This article explores Chapter 10: Human Eye and Colourful World Refraction. It highlights key competency-based questions and provides answers to help students succeed. Prepare for your CBSE Class 10 Science exams with important competency-based questions from Chapter 10: Human Eye and Colourful World Refraction.

CBSE Class 10 Science Chapter 10: Human Eye and Colourful World Refraction Important Competency-Based Questions

Q1. If the Earth did not have an atmosphere, which of the following shows what you would see if you looked at the Sun?

(Note: You should never look at the Sun directly.)

Answer the following questions based on the information given below:

The far point and the near point refer to the visibility of objects close by and far away from the human eye respectively. These are the maximum and minimum distances at which an object is clearly visible to a person.

Ans.

Q2. The near point and the far point are determined with regards to the function of which part of the eye?

1. pupil

2. retina

3. eye-ball

4. ciliary muscles

Ans. 4. ciliary muscles

Q3. Which of these is a reason why a far-sighted person needs a convex lens to correct his vision?

1. The image forms in front of his retina.

2. The image forms behind the retina.

3. The image forms below the retina.

4. The image forms on the retina.

Ans. 2. The image forms behind the retina.

Q4. A person's near point is at 45 cm and far point is at 2 m.

What kind of corrective lens is BEST suited for his vision defect?

1. convex

2. concave

3. bifocal

4. plano-convex

Ans. 3. bifocal

Q5. Which of the following can be directly affected if the iris does not function properly?

1. identification of colours

2. the amount of light entering the eye

3. transmission of visual information to the brain

4. finer adjustments for focussing the objects

Ans. 2. the amount of light entering the eye

Q6. Rohan lit an incense stick in his room and after an hour observed that when a beam of sunlight entered his room through a small gap in the window, he was able to see the path of the beam.

Which of the following is most likely TRUE about the air present in the room?

1. It is a pure substance.

2. It is a compound.

3 It is a solution.

4. It is a colloid.

Ans. 4. It is a colloid.

Q7. In a medium like glass, the velocity of light increases as the wavelength increases.

Which of the following light would be the fastest in glass?

1. blue

2. violet

3. green

4. red

Ans. 4. red

Q8. Which of the following correctly gives the sequence of events that take place when human eye changes its focus from a distant object to an object closer to the eye?

1. ciliary muscles relax --> curvature of eye lens increases --> focal length of eye lens increases

2. ciliary muscles contract --> curvature of eye lens decreases --> focal length of eye lens increases

3. ciliary muscles relax --> curvature of eye lens decreases --> focal length of eye lens decreases

4. ciliary muscles contract --> curvature of eye lens increases --> focal length of eye lens decreases

Ans. 4. ciliary muscles contract --> curvature of eye lens increases --> focal length of eye lens decreases

Q9. Mars's atmosphere is composed mainly of carbon dioxide, nitrogen and argon and negligible amounts of oxygen, water vapour and methane.

Using the information given in the sentence above and knowledge about how rainbows are formed on Earth, explain why rainbow formation is impossible on Mars.

Ans. There is not enough water vapour in the atmosphere to cause scattering of light. 

Q10. Space is mostly vacuum, devoid of any medium.

(a) What colour does the Sun appear to the astronauts on International Space Station?

(b) Give reason for your answer to (a).

Ans. (a) white

(b) Since there is no medium to disperse or scatter the light coming from the Sun, it appears white.

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