The first tests to identify mental abilities were created specifically for children in order to distribute them (taking into account their intelligence) in different classes and schools. In this context, the IQ determined the level of intelligence or the intelligence of a child.
As a rule, IQ level is determined genetically and is inherited. Develop natural intelligence almost impossible. You can train on various tests and get a high IQ. The most common of these tests are the tests of D. Wechsler and G. Eysenck. G. Eysenck's test determines IQ (IQ) depending on the number of correctly answered questions. Test limited by time. The test is given 30 minutes. If it is necessary to determine the missing word in the question, then the quantity letters in the missing word are specified by dots. For example, the notation (. . . . .) Means that you need to define a five-letter word.
To calculate the IQ coefficient, a straight line formula on a plane was obtained. In general, the straight line formula has the form (Fig. 2):
For our case, we have (Fig. 3):
The test is taken from the book by G. Eysenck «Новые IQ тесты».
The test is limited in time. 40 tasks must be completed in 30 minutes. If you fail to meet the specified time, then you can answer the questions further, just the result will be irrelevant.