Below are images of different typefaces belonging to different families. There are two families comprising of four letters each. Identify these letters and write them in the box provided.

Write the 8 letters (two families of four letters each) in the box below:



Shown below is an arrangement of closely stacked spheres. Assume each one to be in contact with its immediate neighbour. What is the total number of points where the spheres touch each other?
Shown on the left is a set of equations. Which option belongs to the same set? 
The words given below are written using a particular font. Identify the digit that does not belong to the same font.
Shown below are three perspective views of a solid object. How many surfaces does the object have? Assume hidden surfaces to be flat.
Which option will replace the question mark? 