Formula to calculate I.Q. is:

Appeared in: IGNOU PB Bsc Entrance-2023

Explanation

The Intelligence Quotient (IQ) is a score derived from standardized tests designed to assess human intelligence.
The original formula for calculating IQ is the ratio of Mental Age (MA) to Chronological Age (CA), multiplied by 100.
Mental Age (MA) is a measure of an individual's cognitive ability compared to the average ability of a particular age group.
Chronological Age (CA) is the person's actual age in years.
Multiplying the ratio by 100 provides a standardized whole number. An IQ of 100 indicates that a person's mental age is the same as their chronological age.

Option B: This formula incorrectly inverts the relationship between Mental Age and Chronological Age. It would result in a lower IQ for someone with advanced cognitive abilities (MA > CA).
Option C: This formula is mathematically incorrect for calculating a quotient. It involves adding the ages, which does not reflect the comparative nature of the IQ score.
Option D: Similar to the previous option, this formula is mathematically invalid. IQ is based on the ratio (division) of mental to chronological age, not their sum.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Calculation of Intelligence Quotient (IQ) as background academic context rather than a clinical decision trigger.
IQ testing is a key component of developmental screening in children to identify potential developmental delays or intellectual giftedness.
In clinical settings, IQ scores help in diagnosing and classifying intellectual disabilities, which is crucial for planning appropriate educational and support services.
What if? If a child's Mental Age is significantly lower than their Chronological Age (e.g., MA=6, CA=10), their IQ would be 60. This score falls into the 'Intellectual Disability' range, signaling the need for comprehensive assessment and specialized intervention.

How to Approach the Question

This is a factual recall question that tests your knowledge of a standard psychological formula.
First, identify the key terms in the question: 'Formula' and 'I.Q.' (Intelligence Quotient).
Recall the definition of IQ as a ratio between mental development and actual age.
Remember the specific components: Mental Age (MA) is the numerator, and Chronological Age (CA) is the denominator.
Scan the options to find the one that matches the correct formula: (MA / CA) × 100.
Eliminate options that use incorrect mathematical operations (like addition) or invert the formula.

Concept Tested & Keywords

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E6 Psychology Baron Misra 5e Part 2 p. 50-52

E6 Psychology Morgan King 9e Part 2 p. 129-131

E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart A (pp 1-232 of 464) p. 216-218

Practise the full IGNOU PB Bsc Entrance-2023

Attempt every question from this paper in a timed mock, then review the full solution for each one.