Which number indicates doctors who are not married

Identify the diagram that best represents the relationship among the classes given below : Animals, land animals, sea animals

Find out the number of circles in the given figure:

The figure given on the left hand side is folded to form a box. Choose from the alternatives (1), (2), (3) and (4) the boxes that is similar to the box formed.

How many triangles are there in the figure

In a row of men, Manoj is 30th from the right and Kiran is 20th from the left. When they interchange their position, Manoj becomes 35th from the right. What is the total number of men in the row