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STD 11 - 10.2 , transmission of heat — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 10.2 , transmission of heat4 Marks
MCQ
A thin paper cup filled with water does not catch fire when placed over a flame. This is because
  • A
    the water cuts off oxygen supply to the paper cup
  • B
    water is an excellent conductor of heat
  • ✓
    the paper cup does not become appreciably hotter than the water it contains
  • D
    paper is a poor conductor of heat
✓

Answer

Correct option: C.
the paper cup does not become appreciably hotter than the water it contains
c
(c)

Thermal resistance of thin layer of paper is quite less, so heat reaches across the paper and water absorbs that heat. Temperature of paper does not rises beyond $100^{\circ} C$ and upto its burning temperature.

$\therefore$ Paper cup does not catches fire.

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