I.Q tests were developed during the 1920s by French psychologists in an attempt to categorize French children into different groups of intelligence. The French I.Q test for children was taken and then bettered by American psychologists, who then produced a method of I.Q testing which most people are familiar with today - a version which has been described as one of the most influential scientific inventions of this century (trust the Americans to take the credit).

How the scoring works is that the participant's number of correct answers is compared to the average expected score of someone their age, this score is then multiplied by 100 which is only don to make the number prettier and more rounded. For instance:

participants score = 10
expected score = 10


ps10 / es10 = 1          

1 x 100 = 100 , thus the participant has an I.Q of 100.

This I.Q of 100 is also the statistical average I.Q of the human population, and most people tend to lie between 90 - 110. I myself have an I.Q of 132 (as of 2005, but I have lost many a braincells since then). Frankly I think using and I.Q test to measure one's intelligence is stupid and completely inaccurate (as seen by my result) as there are many different types of intelligence most of which aren't tested under traditional I.Q tests.

Bodily-Kinesthetic

This area has to do with movement and doing. People are generally good at physical activities such as sports or dance and often prefer activities which use movement.

Interpersonal

This area has to do with interaction with others. People in this category are usually extroverts and are characterized by their sensitivity to others' moods, feelings, temperaments and motivations, and their ability to cooperate in order to work as part of a group.

Verbal-Linguistic

Verbal-linguistic intelligence has to do with words, spoken or written. People with verbal-linguistic intelligence display a facility with words and languages.

Logical-Mathematical

This area has to do with logic, abstractions, inductive and deductive reasoning, and numbers.

Naturalistic

This area has to do with nature, nurturing and relating information to one's natural surroundings. This is the eighth and newest of the intelligences, added to the theory in 1999.

Intrapersonal

This area has to do with introspective and self-reflective capacities. Those who are strongest in this intelligence are typically introverts and prefer to work alone.

Visual-Spatial

This area has to do with vision and spatial judgment. People with strong visual-spatial intelligence are typically very good at visualizing and mentally manipulating objects.

Musical

This area has to do with rhythm, music, and hearing. Those who have a high level of musical-rhythmic intelligence display greater sensitivity to sounds, rhythms, tones, and music.


 
There is also suggestion of an emotional intelligence, but this seems to be contrite effort to be P.C and provide a way for every dumbass to feel that they are intelligent in one way or another. Lets just stick to the most reliable source of intelligence measurement : NCEA.