Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd word from the given alternatives.

Select the odd word/letters/number/number pair from the given alternatives.

Select the odd word/letters/number/number pair from the given alternatives.

In the following question, select the odd word pair from the given alternatives.

In the following question, select the odd word pair from the given alternatives.

If cot 240° = x, then the value of x is

Find the total surface area (in cm²) of a right circular cylinder of diameter 42 cm and height 14 cm

Two pipes, when working one at a time can fill a cistern in 2 hrs and 3 hrs, respectively while a third pipe can drain the cistern empty in 6 hrs. All the three pipes were opened together when the cistern was 1/6 full. How long will it take for the cistern to be completely full?