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.

Vishnu spends Rs. 5000 in buying 12 tables and some chairs. The cost of one table is Rs. 50 and that of one chair is Rs. 40. What is the ratio of the numbers of tables purchased?

What is the diameter (in cm) of a sphere of surface area 6.16 sq cm?

What is the sum of the measures of all the interior angles of a regular polygon of 5 sides?

What can be the maximum number of common tangent which can be drawn to two non-intersecting circles?

By what least number should 1200 be multiplied so that it becomes a perfect square?

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

The square root of 4096 is