Directions for: The questions consist of two statements each, printed as assertion and reason. While answering these questions you are required to choose any one of the following five responses A. If both the Assertion and the Reason are true and the Reason is a correct explanation of the Assertion. B. If both the Assertion and the Reason are true but the Reason is not a correct explanation of Assertion. C. If the Assertion is true but the Reason is false. D. If both the Assertion and the Reason are false. E. If Assertion is false but Reason is true.
Assertion: Woollen clothes keep the body warm in winter. Reason: Air is a bad conductor of heat.A) A
B) B
C) C
D) D
E) E
Correct Answer: A
Solution :
The fibres of woollen clothes have large interspaces and air is filled in these spaces. Since this air is immovable convection currents are not set up in it and so heat transmission by convection does not take place. Also since air is a bad conductor of heat, there is no heat- transmission by conduction also.
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