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Science
10th
grade
Human Eye and the Colourful World | Chapter Assessment | English | Grade 10
6 questions
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- 1. Multiple Choice
Which flow is correct to see the nearby objects clearly?
Ciliary muscles relaxed - lens becomes thinner - focal length increases
Ciliary muscles contracts - lens becomes thicker - focal length decreases
Ciliary muscles relaxed - lens becomes thicker - focal length increases
Ciliary muscles contracts - lens becomes thinner - focal length decreases
- 2. Multiple Choice
A person is unable to see distant object clearly. S/he also finds it difficult to read newspaper sometimes. What can be the defect with his/her eyes?
Myopia
Hypermetropia
Presbyopia
Cataract
- 3. Multiple Choice
Select the odd one out?
Excessive curvature of the eye lens
Elongation of the eyeball
Concave lens
Farsightedness
- 4. Multiple Choice
We see reddish color sky during sunset and sunrise. Select the incorrect statement.
Light travels more in the atmosphere
Sun is near the horizon
Red color is scattered most
Blue color is scattered by the particles
- 5. Multiple Choice
The white light dispersed into a spectrum of seven colors. What will happen if a second identical prism is placed in an inverted position?
Seven colors will further break down into 49 colors
Spectrum will recombine into the white light
No change
Spectrum will recombine and become blue light
- 6. Multiple Choice
Choose the odd one out.
Twinkling of stars is due to the atmospheric refraction of starlight.
The path of the rays of light varies, the apparent position of star fluctuates.
The atmospheric refraction occurs in the medium of constant refractive index.
The starlight, on entering the earth's atmosphere, undergoes refraction before it reaches the earth.
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