AP PSYCHOLOGY

Detailed explanation-1: -It wasn’t until the turn of the 20th century that Frenchman Alfred Binet (1857-1911) developed the first test resembling a modern intelligence test.

Detailed explanation-2: -Binet and Simon ultimately came up with a test that included 30 questions, such as asking about the difference between “boredom” and “weariness, ” or asking the test-taker to follow a moving object with just one eye. 6 This became known as the Binet-Simon Scale and was the first recognized IQ test.

Detailed explanation-3: -Alfred Binet (French: [binɛ]; 8 July 1857 – 18 October 1911), born Alfredo Binetti, was a French psychologist who invented the first practical IQ test, the Binet–Simon test.

Detailed explanation-4: -Mental age was first defined by the French psychologist Alfred Binet, who introduced the intelligence test in 1905.

Detailed explanation-5: -From Binet’s work, the phrase “intelligence quotient, ” or “IQ, ” entered the vocabulary. The IQ is the ratio of “mental age” to chronological age, with 100 being average. So, an 8 year old who passes the 10 year-old’s test would have an IQ of 10/8 x 100, or 125.