Which character is used to denote a single-line comment

What should come in place of the question mark (?) in the given series?

8, 21, 34, 47, 60, ?

Select the set in which the numbers are related in the same way as are the numbers of the following set.

Select the option that represents the letters that when placed from left to right in the blanks below will complete the given letter series.

Select the option that represents the correct order of the given words as they would appear in an English dictionary.

1. Diamond

Which of the following terms will replace the question mark (?) in the given series?

MFT, NIS, PLQ, SON, WRJ, ?

Answer these questions based on the following information.

There are 4 red balls, 4 green balls and 6 blue balls, in a box

Select the option in which the given figure is embedded (rotation is NOT allowed).

What would be the symbol on the opposite side of '≠ ' if the given sheet is folded to form a cube?