IAS Interview Question Part 3

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Q. (1) What causes your eyes to close when you sneeze?

Image of What causes your eyes to close when you sneeze

Image of What Causes Your Eyes to Close When You Sneeze

Image of What causes your eyes to close when you sneeze

  • Sneezes are uncontrolled. You may close down your eyelids so that when you sneeze out germs they don’t fall on your eyes.

  • Our eyes shut because they are one of a series of muscles that pinch during that involuntary response.

  • The nose and eyes are associated by cranial nerves, so the piquancy from the sneeze driving up one nerve to the brain, then down another nerve to the eyelids triggering a blink for most people.

Q. (2) Why do chairs have four legs? Not 3 or 5?

Image of chairs

Image of Chairs

Image of chairs

  • One of the reason behind four legged chair is that thay are easy in manufacturing, it is much yielding to make square frame than triangular or Pentagon one, as square cut piece of wood or other material join together at 90 degree angles.

  • Other reason is comfort. A triangular or pentagon seat is not as comfortable for human as a square or other shaped seat.

  • Another reason for a four – legged chair is that if one of the legs is impaired, the chair needs all three legs to function.

  • While this isn’t much of a problem in today’s modern world, hundreds of years ago, this may have been more important.

Q. (3) How did the word “Goodbye” come to be?

The word ‘Goodbye’ originally comes from an old English phrase meaning ‘God be with you’.

Q. (4) Why does sugared coffee/tea taste bitter if we have it after tasting something sweet?

Image of coffee and sweets

Image of Coffee and Sweets

Image of coffee and sweets

  • This is known as sensory debility. Once your brain becomes addicted to a nonstop signal, it leads to ignore it, and targets on looking for dominant changes. So, if your brain is continually sensing sweet, sweet things become the norm, and your brain doesn’t concern them much.

  • However, do something desperate like eating a lemon or pickle, and your brain will be striking that as “extremely extra sour” due to the sudden change. Your brain recovers to “normal” after you let your senses rest a bit.

Q. (5) Why is moonlight white not yellow?

Image of moonlight

Image of Moonlight

Image of moonlight

  • Actual colour of moon is grey, colour you see comes from the surface of the moon which is mostly oxygen, silicon, magnesium, iron, calcium and aluminum.

  • The whiteness of moonlight is mainly on chronolical of fraility of moonlight. The moon is a poor reflector of light, which leads to lower intensity of light reflected towards earth.

  • As humans, we are incompetent to extricate colours in dim light, this results in we perceiving moonlight as white in colour.

  • Moonlight is too faint to stimulate the colour sensitive cells on our retina and the sensors generates white colour and sends it to our brain.

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