Chapter 5: Human Eye and Colourful World — Online MCQ Test
PHYSICAL SCIENCES · CLASS 10th · Telangana State Board
Practice Chapter 5: Human Eye and Colourful World with a free chapter-wise online MCQ test.
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.
Chapter 5: Human Eye and Colourful World — Important Questions & Answers
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).
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.
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.
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.
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.
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.