The concept of Intelligence Quotient (IQ) was devised by:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → William Stern
In 1912 the German psychologist William Stern devised the concept of Intelligence Quotient (IQ): mental age divided by chronological age, multiplied by 100.
The other names belong to the same story of intelligence testing. Alfred Binet, with Simon, gave the concept of mental age in 1908; Lewis Terman studied gifted children with IQs of 130 and above from 1925; David Wechsler is known for the most widely used intelligence tests and defined intelligence by its value for adaptation to the environment.
Note: A similar question was also asked in CUET (UG) 2023 on 29-05-2023 (Slot 1) and 02-07-2023 (Slot 3), and in CUET (UG) 2024 on 19-07-2024 (Slot 1).
NCERT (2025-26): “Assessment of Intelligence … In 1908, when the scale was revised, they gave the concept of Mental Age (MA), which is a measure of a person’s intellectual development relative to people of her/his age group. A mental age of 5 means that a child’s performance on an intelligence test equals the average performance level of a group of 5-year olds. Chronological Age (CA) is the biological age from birth. A bright child’s MA is more than her/his CA; for a dull child, MA is below the CA. Retardation was defined by Binet and Simon as being two mental age years below the chronological age. In 1912, William Stern, a German psychologist, devised the concept of Intelligence Quotient (IQ). IQ refers to mental age divided by chronological age, and multiplied by 100.…” |