A room of internal dimension 4m x 5m x 3.5m (L x B x H)

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A room of internal dimension 4m x 5m x 3.5m (L x B x H) has 20 cm thick walls and two doors of size 1m x 2m. The required area of Damp Proof Course (sq.m) is _____________

1. 3.3 to 3.4
2. 9.3 to 3.4
3. 5.3 to 3.4
4. 4.3 to 3.4

Correct Option: A

(3.3 to 3.4)
Total parameter of wall = 4 + 5 + 4 + 5 = 18 m
Subtract width of two doors 2 × (1m)
Thickness of wall = 0.2 m
Area for DPC = 16 × 0.2 = 3.2 sq m