Quantitative Aptitude - Arithmetic Ability Questions

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

If Sin4A - Cos4A = 1 then (A/2) in degrees is 0° < A ≤ 90°

If tanA = x, then x is

Which value among 53, 64,126,27612 is the largest?

The sum of a non-zero number and thrice its reciprocal is 52/7. Find the number.

A boat is moving away from an observation tower. It makes an angle of depression of 60° with an observer's eye when at a distance of 50m from the tower. After 8 sec., the angle of depression becomes 30°. By assuming that it is running in still water, the approximate speed of the boat is

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

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