Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd number group from the given alternatives.

Square of (7 ­- 4x) is

What is the reflection of the point (3,-5) in the origin?

Find k, if the line 4x - y = 1 is perpendicular to the line 5x - ky = 2?

Select the odd word from the given alternatives.

If the population of a town increases by 25% in the first year and increases by 36% in the second year, then what is the average rate (in percentage)of increase in the population?

Find the volume (in cub.cm) of a sphere of diameter 42 cm

Two trains, one 150 m long and the other 130m long, coming from opposite directions crosssed each other in 7.2 seconds. The sum of speed of the two trains every hour would then be