In a shower, 10 cm of rainfall falls uniformly over 1 hectare of ground. Compute the volume of water (give the correct value in m^3).
Aptitude
Volume and Surface Area
Difficulty: Easy
Choose an option
-
A1000 m3
-
B900 m3
-
C1200 m3
-
D750 m3
Answer
Correct Answer: 1000 m3
Explanation
Introduction / Context:Uniform rainfall depth over an area yields a water “prism” of that depth. Volume is simply area multiplied by depth, with careful unit conversion to cubic metres (m^3).
Given Data / Assumptions:
- Rain depth = 10 cm = 0.10 m.
- Area = 1 hectare = 10,000 m^2.
Concept / Approach:Volume V = Area * Depth, ensuring both are in metres to produce m^3 directly.
Step-by-Step Solution:
V = 10,000 m^2 * 0.10 m = 1,000 m^3Verification / Alternative check:Convert to cm^3: 1,000 m^3 = 1,000 × 10^6 cm^3 = 10^9 cm^3 (useful cross-check).
Why Other Options Are Wrong:Values like 750 m^3 or 900 m^3 result from misusing hectare or depth units.
Common Pitfalls:Confusing m^2 and cm^2; forgetting that 1 hectare = 10,000 m^2; converting depth incorrectly.
Final Answer:1000 m3