Match List-I (Name of stone) with List-II (Use of stone) and select the correct answer using the codes given below the lists.
| List-I | List-II |
|---|---|
| a.Granite | 1.Ornamental work |
| b.Marble | 2.Ballast |
| c.Chalk | 3.Rough stonework |
| d.Laterite | 4.Manufacture of cement |
Codes:
- Aa – 3, b – 1, c – 2, d – 4
- Ba – 2, b – 3, c – 1, d – 4
- Ca – 2, b – 1, c – 4, d – 3Correct
- Da – 1, b – 4, c – 2, d – 3
Solution
Concept
Engineering Uses of Stones
Formula
No
Step-by-step solution
1. Match Granite with Ballast (a - 2). 2. Match Marble with Ornamental work (b - 1). 3. Match Chalk with Manufacture of cement (c - 4). 4. Match Laterite with Rough stonework (d - 3). 5. Select Option C based on the matching codes.
Explanation
Option C is correct because each stone matches its specific engineering use: - Granite (a - 2) is a very hard igneous rock used as ballast for railway tracks. - Marble (b - 1) is an attractive metamorphic rock easily carved for ornamental and decorative work. - Chalk (c - 4) is a soft limestone composed mainly of calcium carbonate, making it a key raw material in manufacturing cement. - Laterite (d - 3) is a soft, porous rock suitable for rough stonework and cheap masonry blocks.
Shortcut
Remember key pairings: Marble is for Beauty/Ornament, Chalk is for Cement (both C), Granite is hard like railway Ballast, and Laterite is for rough Later/Local stonework. Match Marble (b-1) and Chalk (c-4) first to quickly eliminate wrong options.
Common mistake
A common mistake is confusing the uses of Chalk and Laterite, or misassociating Granite with rough stonework instead of railway ballast, leading students to incorrectly select options like B or A instead of C.
Correct answer: C) a – 2, b – 1, c – 4, d – 3