HUMAN EYE AND COLOURFUL WORLD
(Each question is of 2 marks)
Class X (CBSE) Physics
1. Why when
the sun is overheated at noon, it appears white but when the same sun is near
the horizon at sunset, it appears red?
2. Why stars
twinkle at night?
3. Why ocean
is blue in colour?
4. When we
enter the dim light room from bright sunlight outside, why does it take time to
see the objects clearly?
5. How rainbow
is formed?
6. A boy uses
spectacles of focal length 50cm. name the defect of vision he is suffering
from.
7. A man can
read the number of distant bus clearly but he finds difficulty in reading book.
What disease he is having?
8. Astronauts
observe the sky as dark instead of blue why?
9. Why planets
do not twinkle?
10. Why is a
normal eye not able to see clearly the objects placed closer than 25cm.
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