Subject :NSO Class : Class 7
Preeti burnt a fibre X. She found that X is selfextinguishing and leaves a dull black bead which crushes easily to powder. Which of the following could be fibre X?
AWool
BSilk
CNylon
DBoth A and B
Ans 1:
Class : Class 7
Ans 2:
Class : Class 9
Ans 3:
Class : Class 7