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Explain q 32
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The image actually shows Question 22 (the circled number is 22, not 32). Here is the full explanation:
Q. 22 - WHO Classification: IQ Score for Moderate Mental Retardation
Correct Answer: (b) 35-49
WHO Classification of Mental Retardation (IQ-based)
According to the WHO, intelligence follows a normal distribution with a mean of 100. Individuals scoring 70 or below (roughly the lower 3% of the population) are considered mentally retarded. The WHO classifies the degrees as follows:
| Category | IQ Range |
|---|---|
| Mild mental retardation | 50 - 70 |
| Moderate mental retardation | 35 - 49 |
| Severe mental retardation | 20 - 34 |
| Profound mental retardation | Under 20 |
So the answer is (b) 35-49.
Why the Other Options Are Wrong
| Option | IQ Range | What it actually represents |
|---|---|---|
| (a) 20-34 | Severe mental retardation | Not moderate |
| (b) 35-49 | Moderate mental retardation | CORRECT |
| (c) 50-60 | Overlaps with mild range (50-70) | Not a standard WHO category boundary |
| (d) 60-65 | Within the mild range | Not moderate |
Key Memory Points
- Mild (50-70): Most common (about 70% of all cases). These individuals can often learn to adapt socially.
- Moderate (35-49): About 20% of cases. These children need significant support but may learn basic self-care.
- Severe (20-34): About 5% of cases. Most remain dependent throughout life.
- Profound (<20): Least common. Almost entirely dependent.
A useful mnemonic: "70-50-35-20" are the cutoff points going downward from mild to profound.
Note: The IQ ranges must not be applied too rigidly - IQ level is not necessarily constant across an individual's life span.
Reference: Park's Textbook of Preventive and Social Medicine (the question paper cites Ghai, 7th Ed., Pg. 79)
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