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Question 1 of 30
1. Question
Assertion: Blind spot is a small area of the retina which is insensitive to light where the optic nerve leaves the eye.
Reason: There are no rods or cones present at the junction of optic nerve and retina in the eye.CorrectIncorrect -
Question 2 of 30
2. Question
The defect of the eye in which the eyeball becomes too long is
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Question 3 of 30
3. Question
What type of image is formed by the eye lens on the retina?
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Question 4 of 30
4. Question
The amount of light entering the eye can be controlled by the
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Question 5 of 30
5. Question
At noon, the Sun appears white as
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Question 6 of 30
6. Question
Twinkling of stars is due to
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Question 7 of 30
7. Question
The splitting of white light into different colours on passing through a prism is called
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Question 8 of 30
8. Question
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
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Question 9 of 30
9. Question
The clear sky appears blue because
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Question 10 of 30
10. Question
One cannot see through the fog, because
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Question 11 of 30
11. Question
Refraction of light by the earth’s atmosphere due to variation in air density is called
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Question 12 of 30
12. Question
The deflection of light by minute particles and molecules of the atmosphere in all direction is called …………………….. of light.
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Question 13 of 30
13. Question
The air layer of atmosphere whose temperature is less then the hot layer behave as optically
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Question 14 of 30
14. Question
The focal length of the eye lens increases when eye muscles.
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Question 15 of 30
15. Question
The colour that is scattered the least by the tiny particles and the atoms/ molecules of the atmosphere is
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Question 16 of 30
16. Question
The image formed on the retina of the human eye is
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Question 17 of 30
17. Question
When a person is myopic, he/ she can clearly see
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Question 18 of 30
18. Question
The defect of vision in which the person is able to see distant object distinctly but cannot see nearby objects clearly is called
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Question 19 of 30
19. Question
The defect of myopia can be corrected by using
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Question 20 of 30
20. Question
Which of the following phenomenon contributes significantly to the reddish appearance of the sun at sunrise or sunset?
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Question 21 of 30
21. Question
Assertion: Concave mirrors are used as reflectors in torches, vehicle head-lights and in search lights.
Reason: When an object is placed beyond the centre of curvature of a concave mirror, the image formed is real and inverted.CorrectIncorrect -
Question 22 of 30
22. Question
Assertion: The near-point of a hypermetropic eye is more than 25 cm away.
Reason: Hypermetropia is corrected using spectacles containing concave lenses.CorrectIncorrect -
Question 23 of 30
23. Question
Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?
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Question 24 of 30
24. Question
The medical condition in which the lens of the eye of a person becomes progressively cloudy resulting in blurred vision is called
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Question 25 of 30
25. Question
The least distance of distinct vision for a normal eye is
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Question 26 of 30
26. Question
The defect of vision in which a person cannot see the distant objects clearly but can see nearby objects clearly is called
CorrectIncorrect -
Question 27 of 30
27. Question
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
CorrectIncorrect -
Question 28 of 30
28. Question
Near and far points of a young person normal eye respectively are
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Question 29 of 30
29. Question
Twinkling of stars is due to atmospheric
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Question 30 of 30
30. Question
The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light
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