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Question
Physics
Assertion: Woolen clothes keep the body warm in winter. Reason: Air is a bad conductor of heat.
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Q.
Assertion :
Woolen clothes keep the body warm in winter.
Reason :
Air is a bad conductor of heat.
AIIMS
AIIMS 2002
Thermal Properties of Matter
A
If both the assertion and reason are true and reason is a correct explanation of the assertion
33%
B
If both assertion and reason are true but assertion is not a correct explanation of the assertion
34%
C
If the assertion is true but the reason is false
32%
D
If both assertion and reason are false
1%
Solution:
Woolen fibres enclose a large amount of air in them. Both wool and air are the bad conductors of heat and their coefficient of thermal conductivity is small. Thus they prevent any loss of heat from our body.