Q.

The lines in a space which are neither intersecting nor parallel, are called:

1 concurrent lines  
2 intersecting lines  
3 skew lines  
4 parallel lines  

Ans.

(3)

Ans.        skew lines

Explanation:

In a space, there are lines which are neither intersecting nor parallel. Infact, such pair of lines are non-coplanar and are called skew-lines.