Which standardized test begins by determining the mental age of the subject and then asks progressively more difficult questions until the subject can no longer answer?

Stanford Binet test

Explanation:

Stanford Binet test was designed by Binet to measure the overall ability of a person, cognitive intelligence, intelligence, etc. This test measures the impairment related to cognitive ability such as learning disabilities, in a person. This test measures the different factors such as memory, reasoning, knowledge, and processing, etc. There are different types of IQ test such as long IQ tests and small IQ tests.

Thus Stanford Binet test begins by determining the mental age of the subjects and ask progressively more difficult questions until the subject no longer answers.

Stanford-Binet test

Explanation:

Stanford-Binet test is used to measure the intelligence. It uses five factors of cognitive ability. The five factors are knowledge, fluid reasoning, visual-spatial processing, quantitative reasoning and working memory, both nonverbal and verbal responses of the person being tested are measured in this test.

All the five factors are given a weight and the score of test is combined and reduced to a ratio that is known as IQ. It is the most standardised test currently in use. It has been revised many times. It is developed form of Bienet-Simon Scale.