<prompt> Intelligence quotient is calculated as:Mental ageChronological age x100Chronological ageMental Age x100Mental age x Chronological ageMental age chronological age2  <response>: Ans. A. Mental age Chronological age x100An intelligence quotient IQ is a total score derived from several standardized tests designed to assess human intelligence. The intelligence quotientIntelligence quotient IQ refers to mental age MA expressed as a ratio of chronological age CA multiplied by 100. Intellect comprises perception, memory, recognition, conceptualization, convergent and divergent reasoning, verbal ability and motor competence. . There are various intelligence tests that have been devised. Few of them are Phataak adaptation of Bayley scale, Kulshrestha adaptation of Standford Binet test. 