Question

For the construction of domes:
1. Heavier stones are preferred
2. Lighter stones are preferred
3. Stones are not preferred
4. Both lighter and heavier stones are preferred

Answer 1

Correct Answer - Option 2 : Lighter stones are preferred

Concept: 

Type of work	Recommended stone type	Reasons
Ornamental works (Carving work, construction of domes and arches)	Marble, close-grained sandstone	These are light in weight, soft and easy to work, and have pleasing colour and appearance.
Heavy engineering work	Granite	It is heavy, strong, durable and capable of resisting large thrust.
Arches	Fine-grained sandstone	Strong and durable.
Railway ballast	Coarse-grained sandstone, Quartzite	These are hard and compact.
Electrical switchboard	Slate, marble	Poor conductor of electricity.