railway RRB JE (CBT I + CBT II) Mock Test 2024 Draftsman Floor and Roof Types of Roofs

Lime terracing is provided with how much slope to drain off rainwater from roof to gutters?

1
1:60 to 1:100 
2
1:10 to 1:20
3
1:6 to 1:10
4
1:20 to 1:60
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