Match the following lists :
| List-I | List-II |
|---|---|
| P.Trap and Basalt | 1.Damp proofing and partitions |
| Q.Sandstone | 2.Rough stone for masonry work |
| R.Laterite | 3.Tile stone for roofing |
| S.Slate | 4.Road metal and concrete aggregate |
Select the correct answer using the code given below :
- A1 3 2 4
- B4 2 3 1
- C3 4 2 1
- D4 3 2 1Correct
Solution
Concept
Common stones and their uses
Step-by-step solution
1. Trap and basalt: hard and tough, used as road metal and concrete aggregate → 4. 2. Slate: splits into thin sheets, used for damp proof courses and partitions → 1. 3. Laterite: porous, cut into blocks and used as rough stone for masonry → 2. 4. Sandstone: used as a tile or flag stone (roofing and paving) → 3.
Explanation
Each stone is selected for its properties: hard igneous rocks for aggregate, slate for thin sheets, laterite for rough walling and sandstone as tile stone.
Why the other options are wrong
The other codes assign road metal to slate or sandstone, which are too soft or lamellar.
Shortcut
Basalt = road metal; slate = DPC; laterite = rough masonry.
Common mistake
Mixing sandstone and laterite.
Correct answer: D) 4 3 2 1