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Subject :NSO    Class : Class 8

Which of the following has the highest tensile strength?

(A) Cotton

(B) Wool

(C) Silk

(D) Nylon.
Question 19 and 20 are the same then why answers are different? There is no change in both the question then how cotton can be the answer in 20th question and nylon be the answer for the 19th question?

Ans 1:

Class : Class 8
Isn't it nylon

Ans 2:

Class : Class 8
the question is repeated and the solution has no meaning

Ans 3:

Class : Class 8
What is the 20th question??

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