Quantitative Aptitude - Arithmetic Ability Questions

If the radius of the cylinder is decreased by 20%, then by how much percent the height must be increased, so that the volume of the cylinder remains same?

The area of a semicircle is 1925 cm2. Calculate its perimeter (in cm).

What is the area (in sq cm) of a regular hexagon of side 14 cm?

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

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

The slope of the line passing through the points (2,-1) and (x,5) is -1. Find x?

 What is the value of (sin60° - 2/√3) ?

Rs. 10000 is being compounded at 20% per annum. Calculate the amount after 2 years if the rate of interest is charged half yearly.