Chapter Exam

Chapter 5: Human Eye and Colourful World — Online MCQ Test

Q: What is the maximum accommodation power of a normal human eye?

Answer: B. 4 diopters — The accommodation power of a normal human eye is approximately 4 diopters, which allows the eye to focus on objects from the near point (25 cm) to the far point (infinity).

Q: Which part of the human eye is responsible for controlling the amount of light entering the eye?

Answer: B. Iris — The iris is the colored part of the eye that controls the size of the pupil, thereby regulating the amount of light entering the eye.

Q: A person can see objects clearly at a distance of 50 cm but not beyond. What vision defect does this person have?

Answer: A. Myopia — The person has myopia (short-sightedness) as they can see nearby objects clearly but cannot focus on distant objects, indicating the near point is closer than 25 cm.

Q: A student with myopia has a far point of 100 cm. What power of lens is required to correct this vision defect? (Assume corrected far point at infinity)

Answer: B. -1 D — For myopia with far point at 100 cm, the lens power = -1/distance in meters = -1/1 = -1 D. A concave lens of -1 D is needed to shift the far point to infinity.

PHYSICAL SCIENCES · CLASS 10th · Telangana State Board

Practice Chapter 5: Human Eye and Colourful World with a free chapter-wise online MCQ test for Telangana State Board CLASS 10th PHYSICAL SCIENCES. This chapter covers: This chapter connects physics concepts to human anatomy and atmospheric phenomena. It explains the structure of the human eye accommodation power and vision defects (myopia hyperme.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 5: Human Eye and Colourful World — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 10th PHYSICAL SCIENCES — Chapter 5: Human Eye and Colourful World, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the maximum accommodation power of a normal human eye?

A. 1 diopter
B. 4 diopters ✓
C. 10 diopters
D. 25 diopters

Answer: B. 4 diopters
The accommodation power of a normal human eye is approximately 4 diopters, which allows the eye to focus on objects from the near point (25 cm) to the far point (infinity).

Which part of the human eye is responsible for controlling the amount of light entering the eye?

A. Cornea
B. Iris ✓
C. Lens
D. Retina

Answer: B. Iris
The iris is the colored part of the eye that controls the size of the pupil, thereby regulating the amount of light entering the eye.

A person can see objects clearly at a distance of 50 cm but not beyond. What vision defect does this person have?

A. Myopia ✓
B. Hypermetropia
C. Presbyopia
D. Astigmatism

Answer: A. Myopia
The person has myopia (short-sightedness) as they can see nearby objects clearly but cannot focus on distant objects, indicating the near point is closer than 25 cm.

Why does a rainbow form only when the observer's back is towards the sun?

A. The sun's rays must enter the water droplets and exit after refraction and internal reflection ✓
B. Rainbows can only form in morning light
C. The observer's position determines the angle of observation
D. Water droplets reflect light only in one direction

Answer: A. The sun's rays must enter the water droplets and exit after refraction and internal reflection
For a rainbow to form, sunlight must enter water droplets, undergo refraction, reflect internally, and exit at approximately 42° angle back toward the observer's eye, requiring the sun to be behind the observer.

A student with myopia has a far point of 100 cm. What power of lens is required to correct this vision defect? (Assume corrected far point at infinity)

A. -2 D
B. -1 D ✓
C. +1 D
D. +2 D

Answer: B. -1 D
For myopia with far point at 100 cm, the lens power = -1/distance in meters = -1/1 = -1 D. A concave lens of -1 D is needed to shift the far point to infinity.

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