Quantitative Aptitude - Arithmetic Ability Questions

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.

Which of the following is a Pythagorean triplet?

How many of the factors of 256 are perfect squares?

The square of 11111 is

Find the curved surface area (in cm2) of a right circular cylinder of diameter 7 cm and height 6 cm.

Which of the following is in ascending order?

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

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.