How many triangles are there in the below figure?

What is the next term in this series?
L, D, O, E, R, F, ?

Thin wires can be pulled from a metal piece. For which property of the metal is it responsible?

Find the next term in the following series:
31, 38, 44, 51, __

Which metal starts floating when put in water?

Which metal does not react with oxygen even at higher temperatures?

Consider the given statement(s) and decide which of the given assumption(s) is/are implicit in the statement.
Statement:
"Tomorrow morning the hockey team will report by 9.00 am instead of 8:00 am for practise" said the coach.
Assumptions:
I. That day coach had some other work at 8:00 am.
II. They usually assemble for practice.

What percentage of carbon is in steel?