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Matter in Our Surroundings — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceMatter in Our Surroundings1 Mark
MCQ
Why does perspiration leave a cooling effect on our body:
  • ✓
    The sweat particles absorb heat from the body and get converted into vapour, thereby reducing its temperature
  • B
    The sweat particles release energy into the atmosphere and the temperature of the surroundings decrease.
  • C
    The sweat particles absorb energy from the body and get converted into vapour, thereby increasing the temperature.
  • D
    None of the above
✓

Answer

Correct option: A.
The sweat particles absorb heat from the body and get converted into vapour, thereby reducing its temperature
It happens due to evaporative cooling.
The sweat gets vaporized from the skin into the atmosphere, by absorbing heat from the body.
Thus the body cools down as it loses heat.

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