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By how much time day would have been sho...

By how much time day would have been shorter if the earth had no atmosphere ?

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The correct Answer is:
By about 4 minutes

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A : If the earth did not have an atmosphere, its average surface temperature would have been lower. R : In the absence of atmosphere, the green house effect will be absent.

Assertion : If earth did not have atmosphere, its average surface temperature would be lower than what it is now Reason : Green house effect of the atmosphere would be absent, if earth did not have atomosphere.

Assertion:- If earth did not have atomosphere, its average surface temperature would be lower than what it is now. Reason:- Greenhouse effect of the atmosphre would be absent, if earth did not have atmosphere.

LAKHMIR SINGH & MANJIT KAUR-THE HUMAN EYE AND THE COLOURFUL WORLD -Exercise
  1. The day is longer on the earth by about 4 minutes because :

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  2. We know that light refracts (or bends) when it goes from one medium to...

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  3. By how much time day would have been shorter if the earth had no atmos...

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  4. Which of the two is scattered more easily : light of shorter wavelengt...

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  5. What colour does the sky appear to an astronaut ?

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  6. What happens when a beam of sunlight enters a dusty room through a win...

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  7. Why does the sky appear blue on a clear day ?

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  8. Why does the sky appear dark (or black) to an astronaut instead of blu...

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  9. Why does the sun appear red at sunrise ?

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  10. Why does the sun appear red at sunset ?

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  11. Why are the 'danger signal' lights red in colour ?

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  12. The blue colour of sky is due to :

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  13. The red colour of the sun at the time of sunrise and sunset is because...

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  14. Which of the following is not caused by the atmospheric refraction of ...

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  15. The sky appears blue because some of the blue component of sunlight is...

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  16. Sunset is red because at that time the light coming from the sun has t...

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  17. Explain why, when the sun is overhead at noon, it appears white, but w...

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  18. Complete the following statements : When the sun is setting, the lig...

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  19. Graphs plotted by four students A, B, C and D for the experiment "To s...

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  20. What is meant by the power of accommodation of the eye ?

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