Find the odd from the given alternatives?

Four number have been given out of which three are alike in some manner, while is different. Choose the odd one.

Find the odd one in the following.

Four words have been given of which three are alike in some way and one is different. Choose the odd one out.

Directions: In the following question four words have been given, out of which three are alike in some manner and the for one is different. Choose out the odd one.
Triangle
Rectangle
Circle
Square 

In each of the following questions, four numbers are given out of which three are like in some manner while one is different. Choose the one which is different from the rest three?

In each of the following questions, certain pairs of words are given, out of which the words in all pairs except one, bear a certain common relationship. Choose the pair in which the words are differently related?