CBSE Class 10 Mathematics
Question 31 of 35
Surface Areas and Volumes — Question Ex 13.5 Q4
Back to all questions Ex 13.5 Q4
Question In one fortnight of a given month, there was a rainfall of 10 cm in a river valley. If the area of the valley is 7280 km, show that the total rainfall was approximately equivalent to addition to the normal water of three rivers each 1072 km long. 75 m wide and 3 m deep.
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Mathematics | Surface Areas and VolumesWeb Content
CBSE Class 10 Surface Areas and Volumes — Complete Guide
This chapter carries 5-6 marks covering combination of solids, conversion problems, and frustum of a cone.
Quick Revision: Key Concepts
- Combination: Add CSAs (subtract hidden faces for TSA), add volumes
- Conversion: Volume is conserved when solid is melted and recast
- Frustum: V = ⅓πh(R² + r² + Rr), l = √[h² + (R−r)²]
- Water flow: Volume = cross-section area × speed × time
Most Important Questions
- SA and volume of combined solids (tent, capsule, toy)
- Solid melted and recast into smaller solids (find number)
- Frustum volume and surface area (bucket problems)
- Water flow and pipe problems
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