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Subject :NSO    Class : Class 7

Which of the following statement(s) is/are incorrect?
(i) Two thin woollen sweaters are warmer than a thick woollen sweater.
(ii) It saves fuel if we cook food in a vessel which is blackened at the bottom and polished from the sides.
(iii) The cable wires between two poles are left loose because in summers, the wires do not break on expanding.

A Only (i) and (iii)
B Only (ii) and (iii)
C Only (iii)
D Only (i)

How will leaving it loose relate to expansion in summers? Summer should be replaced with winters and expanding we replaced with contracting..

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