Subject :NSO Class : Class 7
A scientist took a metal rod and a wooden rod and wrapped each of them in a piece
of paper. These were then heated as shown. It was found that the paper around the
metal rod does not burn whereas the one around the wooden rod catches fire. It is because
(A) Iron being a good conductor, conducts away heat given to paper
(B) Wood being an insulator, takes away all the heat
(C) Candle in case of iron rod, is near to the paper
(D) Paper, in first case, it thicker.
Ans 1:
Class : Class 7
i think it is "A".
Ans 2:
Class : Class 7
Ans 3:
Class : Class 7
option A
Ans 4:
Class : Class 7
The answer should be A because iron is a good conductor of heat it will take away all the heat given to paper and the paper will not burn.
But in case 2 , we see that there is a wooden rod we all know that wood is a good insulator of heat so it will catch fire easily and the paper wrapped on it will burn easily.