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  • Question
  • When one enters a dark room after being in bright light one is not able to see anything clearly for a while because


  • Options
  • A. the retina of the eye moves forward
  • B. the retina of the eye moves backward
  • C. the iris is unable to dilate the pupil immediately to be able to see things
  • D. the eye has no power of accommodation

  • Correct Answer
  • the iris is unable to dilate the pupil immediately to be able to see things 

    Explanation

    The size of the pupil of the eye automatically adjusts itself  according to the intensity of light passing through it;if the intensity is more , the size is less, if less, it is more. So in our case the pupil should dilate i.e, increase in size to be able to see in the dark . This switchover takes sometime. But here the entry into the dark room is immediate . So the eye has no time to adjust itself and hence is not able to see at all for a while.


  • More questions

    • 1. When was the first elevator built?

    • Options
    • A. 1743
    • B. 1739
    • C. 1760
    • D. 1785
    • Discuss
    • 2. The hardest form of carbon is

    • Options
    • A. coke
    • B. graphite
    • C. diamond
    • D. charcoal
    • Discuss
    • 3. The mica belt of the Himalayas, the major part of it is situated in

    • Options
    • A. Andhra Pradesh
    • B. Bihar
    • C. Rajasthan
    • D. West Bengal
    • Discuss
    • 4. The first 'Financial Service Park' for industry being set up at

    • Options
    • A. Guragaon
    • B. Surat
    • C. Bangalore
    • D. Pune
    • Discuss
    • 5. http://www.CuriousTab.com - is an example of what?

    • Options
    • A. A URL
    • B. An access code
    • C. A directory
    • D. A server
    • Discuss
    • 6. First human heart transplant operation conducted by Dr. Christiaan Barnard on Louis Washkansky, was conducted in

    • Options
    • A. 1967
    • B. 1968
    • C. 1958
    • D. 1922
    • Discuss
    • 7. The working language(s) of the UNESCO is/are

    • Options
    • A. French only
    • B. English only
    • C. English and French
    • D. English, French and Russian
    • Discuss
    • 8. Ralph Samuelson was only 18 when he invented this sporting item in 1922. What was that?

    • Options
    • A. Golf tee
    • B. Motorboat
    • C. Water skis
    • D. Hang glider
    • Discuss
    • 9. Rahul Dravid also made Test debut along with Sourav Ganguly in the same match.He scored 95 runs. How many fours did he hit in that innings of 95 runs?

    • Options
    • A. 6
    • B. 10
    • C. 5
    • D. 7
    • Discuss
    • 10. The smallest glaciers are

    • Options
    • A. mountain or alpine glaciers
    • B. continental glaciers
    • C. piedmont glaciers
    • D. None of the above
    • Discuss


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