Quantitative Aptitude - Arithmetic Ability Questions

How many of the factors of 256 are perfect squares?

R is 80% more efficient than S. If S alone can make a book in 90 days, then R alone can make the book in how many days?

The length and breadth of a rectangle are 15 cm and 8 cm respectively. Find its area (in cm2)

If tanα = 2 - 1, then the value of  tanα - cotα = ?

In the following question, four groups of three numbers are given. In each group the second and third number are related to the first number by a Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

In the following question, four number pairs are given. The number on left side of (–) is related to the number on the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

The angle of elevation of an aeroplane from a point on the ground is 45°. After flying for 15 seconds, the elevation changes to 30°. If the aeroplane is flying at a height of 2500 metres, then the speed of the aeroplane in km/hr. is

The square root of 6084 is