Quantitative Aptitude - Arithmetic Ability Questions

The external and the internal radii of a hollow right circular cylinder of height 15 cm are 6.75 cm and 5.25 cm respectively. If it is melted to form a solid cylinder of height half of the orignal cylinder, then the radius of the solid cylinder is

The line passing through (4,3) and (y,0) is parallel to the line passing through (­-1,-­2) and (3,0). Find y?

A well of diameter 3 m and depth 14 m is dug. The earth, taken out of it, has been evenly spread all around it in the shape of a circular ring of width 4 m to form an embankment. Find the height of embankment?

What is the value of (cos30° + 1/2) ?

If the sum of the interior angles of a regular polygon is 1260 deg , then how many sides does it have?

Find the greatest number which on dividing 391 and 318 leaves remainders 7 and 6 respectively.

The square root of which of the following numbers is irrational?