Here you will find extra questions for class 10 science Chapter 11 Human Eye and Colourful World. Answers are also provided below each question. Students are suggested to go through each and every question to score better in their exam.
Extra Questions for Human Eye and Colourful World
Very Short Answer Questions (VSA)
Question
Name two parts of the eye which refract light rays (or bend light rays).
Answer
Two parts of the eye which refract light rays (or bend light rays) are Cornea and Eye-lens.
Question
What kind of lens is present in the human eye?
Answer
Convex lens is present in the human eye.
Question
What is the name of:
(a) the curved, transparent front surface of the eye?
(b) the light-sensitive layer in the eye?
Answer
(a) The name of the curved, transparent surface is cornea.
(b) The name of the light-sensitive layer in the eye is retina.
Question
Where is the image formed in a human eye?
Answer
the image formed in a human eye at retina.
Question
Name that part of the eye which is equivalent to the photographic film in a camera.
Answer
The part of the eye which is equivalent to the photographic film in a camera is retina.
Question
What is the function of the lens in the human eye?
Answer
The major function of the lens in the human eye is to change its shape and thickness to focus light on the retina.
Question
Name the part of the eye:
(a) Which controls the amount of light entering the eye.
(b) on which the image is formed.
(c) which changes the focal length of eye.
Answer
(a) The part of the eye which controls the amount of light entering the eye is iris.
(b) the part of the eye on which the image is formed is retina.
(c) the part of the eye which changes focal length of eye-lens is ciliary muscles.
Question
What job does the pupil of the eye do?
Answer
According to the intensity of light around the eye, Pupil expands or contracts.
Question
How does the eye adjust to take account of an increase in brightness?
Answer
The pupil of our eye contracts to adjust the eye to take account of an increase in brightness.
Question
Name the part of the retina which is insensitive to light.
Answer
the part of the retina which is insensitive to light is blind spot.
Question
Out of rods and cones in the retina of your eye:
(a) which detect color?
(b) which work in dim light?
Answer
(a) Cones detect color.
(b) Rods work in dim light.
Question
Which part of the eye contains cells which are sensitive to light?
Answer
Retina contains cells which are sensitive to light.
Question
Name two types of cells in the retina of an eye which respond to light.
Answer
The two types of cells in the retina of an eye which respond to light are Rods and Cones.
Question
State whether the following statement is true or false: The image formed on our retina is upside-down.
Answer
True, The image formed on our retina is upside-down.
Fill in the Blanks:
Fill in the following blanks with suitable words:
(a) Most of the refraction of light rays entering the eye occurs at the outer surface of the ________
(b) The part of eye sensitive to light is ________
(c) The part of eye which alters the size of the pupil is ________
(d) When light is dim, the pupil becomes ________
(e) The iris controls the ________amount of entering the eye.
(f) The ciliary muscles control the shape of the ________
(g) To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made ________
(h) To bring light from a near object to a focus on the retina of the eye, the convex eye-lens needs to be made ________
Answer
(a) Most of the refraction of light rays entering the eye occurs at the outer surface of the cornea.
(b) The part of eye sensitive to light is retina.
(c) The part of eye which alters the size of the pupil is iris.
(d) When light is dim, the pupil becomes larger.
(e) The iris controls the amount of light entering the eye.
(f) The ciliary muscles control the shape of the eye-lens.
(g) To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made thinner.
(h) To bring light from a near object to a focus on the retina of the eye, the convex eye-lens needs to be made thicker.
Short Answer Type Questions (SA)
Question
Why is a normal eye not able to see clearly the objects placed closer than 25 cm ?
Answer
All the power of accommodation of the eye is exhausted at a distance of 25 cm. The maximum accommodation of the eye is reached when the object is placed at 25 cm from the eye. After this the ciliary muscles cannot make the eye-lens thicker. This is why a normal eye not able to see clearly the objects placed closer than 25 cm.
Question
What changes take place in the shape of eye-lens: (a) when the eye is focused on a near object?
(b) when the eye is focused on a distant object?
Answer
(a) when the eye is focused on a near object eye-lens become thicker.
(b) When the eye is focused on a distant object the eye-lens becomes thinner.
Question
The eyes of a person are focused (i) on a nearby object, and (ii) on a distant object, turn by turn. In which case:
(a) the focal length of eye-lens will be the maximum?
(b) the converging power of eye-lens will be the maximum?
Answer
(a) The focal length of eye-lens will be the maximum when the eyes of a person are focused on a distant object.
(b) The converging power of eye-lens will be the maximum when the eye of a person is focused on a nearby object.
Question
How is the amount of light entering the eye controlled?
Answer
The part of eye which control the amount of light entering the eye is iris. It is responsible for the adjustment of pupil according to the intensity of light received by the eye. If the amount of light received by the eye is large, then the iris contracts the pupil and reduces the amount of light entering the eye. If the amount of light received by the eye is small, then the iris expands the pupil so that more light may enter the eye.
Question
What happens to the eye when you enter a darkened cinema hall from bright sunshine? Give reason for your answer.
Answer
at first we cannot see anything clearly when we enter the cinema hall from bright sunshine outside. This just for a short period of time. After that our vision improves. The reason behind that is, in bright sunshine the pupil of our eye is small and when we just enter the darkened room very little light enters our eye due to which we cannot see properly. After a while, when the pupil of our eye expands, more light enters our eye and we can see clearly.
Benefits of Extra Questions for CBSE Class 10 Science
Practicing extra questions for CBSE Class 8 Science can offer several benefits to students. Here’s a list of some of these advantages:
- Enhanced Understanding: Extra questions often cover different aspects of a topic, helping students gain a deeper understanding of the subject matter.
- Improved Problem-Solving Skills: Extra questions often involve complex problem-solving, which can sharpen a student’s analytical skills.
- Exam Preparedness: Solving extra questions can help students become more confident and better prepared for their CBSE Class 8 Science exams.
- Higher Scores: Practicing extra questions can lead to better performance in exams, as it exposes students to a wider range of question types and formats.
- Thorough Revision: Going through additional questions reinforces what students have already learned in class, ensuring comprehensive revision.
- Concept Clarity: Extra questions may cover topics from different angles, aiding in clarifying any doubts or misconceptions students may have.
- Time Management: Regular practice of extra questions can improve time management skills during exams, allowing students to complete the paper within the allotted time.
- Increased Confidence: Successfully solving extra questions can boost a student’s confidence in their knowledge and abilities.
- Preparation for Competitive Exams: For students considering future competitive exams, practicing extra questions can be valuable in building a strong foundation.
- Deeper Engagement: Extra questions often require students to think critically and engage more deeply with the subject matter, fostering a love for learning.
- Adaptability: Exposure to a variety of questions helps students become adaptable and better prepared for unexpected questions in exams.
- Holistic Learning: Extra questions often cover real-world applications and practical scenarios, contributing to a more holistic understanding of science concepts.
- Peer Comparison: Students can use extra questions to benchmark their performance against their peers and identify areas where they need improvement.
- Long-Term Retention: Practicing extra questions aids in long-term retention of knowledge, making it easier for students to recall information when needed.
- Fulfilling Curiosity: Science is a subject that often piques curiosity. Extra questions can satisfy a student’s thirst for knowledge by delving deeper into interesting topics.
- Better Grades: Ultimately, the more students practice, the better their chances of achieving higher grades in their CBSE Class 8 Science exams.
Incorporating extra questions into your study routine can be a valuable strategy to excel in CBSE Class 8 Science and build a strong foundation for future scientific studies.