Chapter 10: The Human Eye and the Colourful World — Online MCQ Test
SCIENCE · Grade 10 · CBSE(NCERT)
Practice Chapter 10: The Human Eye and the Colourful World with a free chapter-wise online MCQ test.
This chapter covers: Human eye Retina Iris Pupil Cornea Myopia Hypermetropia Cataract Atmospheric refraction Rainbow Dispersion.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 10: The Human Eye and the Colourful World — Important Questions & Answers
The image formed on the retina of the human eye is:
- A. Real and inverted
- B. Virtual and erect
- C. Real and erect
- D. Virtual and inverted
Answer: A. Real and inverted
The eye lens forms a real and inverted image on the retina. The brain interprets this image as erect.
The eye lens forms a real and inverted image on the retina. The brain interprets this image as erect.
Which part of the eye controls the size of the pupil?
- A. Retina
- B. Iris
- C. Cornea
- D. Optic nerve
Answer: B. Iris
The iris is a muscular diaphragm that controls the size of the pupil. This regulates the amount of light entering the eye.
The iris is a muscular diaphragm that controls the size of the pupil. This regulates the amount of light entering the eye.
When we enter bright sunlight, the pupil of the eye becomes smaller because:
- A. The retina changes its shape
- B. The iris contracts the pupil to reduce light entry
- C. The cornea becomes opaque
- D. The eye lens stops working
Answer: B. The iris contracts the pupil to reduce light entry
In bright light, the iris reduces the size of the pupil. This prevents too much light from entering the eye.
In bright light, the iris reduces the size of the pupil. This prevents too much light from entering the eye.
In myopia, a concave lens is used because it:
- A. Converges the rays before they enter the eye
- B. Diverges the rays so that the image forms on the retina
- C. Blocks excess light from entering the eye
- D. Increases the size of the pupil
Answer: B. Diverges the rays so that the image forms on the retina
In myopia, distant images are formed in front of the retina. A concave lens diverges incoming rays so that the eye lens focuses them on the retina.
In myopia, distant images are formed in front of the retina. A concave lens diverges incoming rays so that the eye lens focuses them on the retina.
A myopic eye has a far point of 50 cm. What lens should be used to correct vision for distant objects?
- A. Concave lens of power -2.0 D
- B. Convex lens of power +2.0 D
- C. Concave lens of power -0.5 D
- D. Convex lens of power +0.5 D
Answer: A. Concave lens of power -2.0 D
For a distant object, the correcting lens must form a virtual image at the far point, 50 cm from the eye. Thus f = -0.50 m and P = -2.0 D.
For a distant object, the correcting lens must form a virtual image at the far point, 50 cm from the eye. Thus f = -0.50 m and P = -2.0 D.