What is full form of computer and what is computer

There is no full form of COMPUTER. Basically,  computer has been coined from the word Compute which means to Calculate. 

But people have coined a more elaborated form of the word COMPUTER based on its each letter. Same is given below.

C = Common

O = Operating

M = Machine

P = Particulary

U = Used for

T = Technical

E = Education and

R = Research

A computer is a digital electronic machine that can be programmed to carry out sequences of arithmetic or logical operations automatically. Modern computers can perform generic sets of operations known as programs. These programs enable computers to perform a wide range of tasks.

Explanation:

I hope it'll help you...

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.