Hardness of 5 materials A, B, C, D and E is A<B<C<D<E. If Steve wanted to pierce a nail into the board made from material C then from which material the nail can be made?

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Solution

The correct options are
C D
D E
Hardness of a substance is the resistance it offers to the substances being pushed through it. Harder the substance, more resistance it will provide to the substance being pushed through it. If the board is made from material C, then only those nails can pierce the board which are made from the materials harder than material C. So, the nail made from material D and E can pierce the board made of material C.

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