alleryStart learning →The base of a dam is made broader than the top because
ABroader base lowers the total cost of the dam
BPressure on the wall rises with depth as P = h rho g
CPressure on the wall falls with depth in a dam
DBroader base reflects sound away from water
Answer & Solution
Correct answer: B. Pressure on the wall rises with depth as P = h rho g
1. Water pressure on the dam wall grows with depth.
2. Greater pressure deep down means a stronger wall is needed there.
3. A broader base provides that strength.
4. So option A is correct.
_Source: Selina Concise Physics Class 9, Ch 4 Pressure in Fluids and Atmospheric Pressure (Mistral OCR'd PDF), section on application: dam_
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