Question

A 10-year-old child has a Mental Age of 12. What is the child’s IQ?

• A. 100
• B. 110
• C. 120
• D. 130

Hint:

If Mental Age is higher than Chronological Age, the IQ will always be above 100. If they are the same, the IQ is exactly 100.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Intelligence Quotient (IQ) is a measure used to express the relative intelligence of a person. The concept of IQ was originally derived using a ratio between mental age and chronological age.

Step 2: Key Formula or Approach:
The formula developed by William Stern is: $$IQ = \frac{MA}{CA} \times 100$$ Where $MA$ is Mental Age and $CA$ is Chronological (Actual) Age.

Step 3: Detailed Explanation:
Given: $MA = 12$, $CA = 10$. \[ IQ = \frac{12}{10} \times 100 \] \[ IQ = 1.2 \times 100 \] \[ IQ = 120 \]

Step 4: Final Answer:
The child’s IQ is 120.