|
"Smoke coming out of coal fired in chimney appears blue on a misty day". Why?
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|
0
|
2805
|
October 19, 2016
|
|
Why are danger signals red?
|
|
0
|
7540
|
October 19, 2016
|
|
"God has given the gift for us to see the sunrise and sunset". Explain the feeling of it?
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|
0
|
851
|
October 19, 2016
|
|
To look at the twinkling of stars is a wonderful experience". How its happening?
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|
0
|
856
|
October 19, 2016
|
|
Have you seen a rainbow in the sky after rain ? How it has formed?
|
|
0
|
1081
|
October 19, 2016
|
|
Why do a normal eye not able to see clearly the objects placed closer than 25 cm?
|
|
0
|
6898
|
October 19, 2016
|
|
Why sun does not appear red during noon hours?
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|
0
|
766
|
October 19, 2016
|
|
What is hypermetropia ? How is it corrected?
|
|
0
|
826
|
October 19, 2016
|
|
Which part of the eye acts as variable aperture for entry of light into the eye?
|
|
0
|
2134
|
October 19, 2016
|
|
What do you mean by least distance of distinct vision ? What is its value?
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|
0
|
469
|
October 19, 2016
|
|
What is "Near sightedness" or "Myopia"?
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|
0
|
412
|
October 19, 2016
|
|
What is "Iris" and "Pupil"?
|
|
0
|
521
|
October 19, 2016
|
|
Doctor advised to use 2D lens. What is its focal length?
|
|
0
|
7547
|
October 19, 2016
|
|
Why do we use lenses in spectacles to correct defects of vision?
|
|
0
|
473
|
October 19, 2016
|
|
Draw the diagram of scattering of sunlight
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|
0
|
1236
|
October 19, 2016
|
|
Draw the graph between angle of incidence and angle of deviation
|
|
0
|
2993
|
October 19, 2016
|
|
How do we see colours?
|
|
0
|
3246
|
October 19, 2016
|
|
A rainbow viewed from an airplane may form a complete circle
|
|
1
|
2793
|
October 19, 2016
|
|
Why does the sun appear reddish early in morning?
|
|
0
|
1074
|
October 19, 2016
|
|
Define power of accommodation?
|
|
0
|
7052
|
October 19, 2016
|
|
How can we appreciate the working of "Iris"?
|
|
0
|
2272
|
October 19, 2016
|
|
How do you appreciate the working of "Retina"?
|
|
0
|
1074
|
October 19, 2016
|
|
What is "Atmospheric refraction"?
|
|
0
|
22151
|
October 19, 2016
|
|
Choose the correct option by making hypothesis based on given assertion and reason. Give an explanation
|
|
1
|
491
|
October 19, 2016
|
|
Choose the correct option by making hypothesis based on given assertion and reason
|
|
1
|
1870
|
October 19, 2016
|
|
Define the following terms with respect to a prism,
|
|
1
|
3871
|
October 19, 2016
|
|
Two observers standing apart from one another do not see the "same" rainbow. Explain
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|
0
|
2339
|
October 19, 2016
|
|
Why rainbow appears as a bow ? Explain with a diagram
|
|
0
|
636
|
October 19, 2016
|
|
Draw the diagram of showing the defect of "Hypermetropia" and how it should be corrected
|
|
0
|
973
|
October 19, 2016
|
|
Draw the diagram of showing the defect of "Myopia" and how it should be corrected
|
|
0
|
1467
|
October 19, 2016
|