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Q: Which of the following is suitably used for rubble masonry and foundation work?
  • A. Basalt
  • B. Gnesis
  • C. Slate
  • D. Limestone
Correct Answer: Option A - Basalt and trap are hard and tough igneous stones which is difficult to work– • Special gravity 2.6-3 • Compressive strength 200-300 N/mm² Use– Rubble masonry, foundation work, suitable for road metal and concrete aggregates.
A. Basalt and trap are hard and tough igneous stones which is difficult to work– • Special gravity 2.6-3 • Compressive strength 200-300 N/mm² Use– Rubble masonry, foundation work, suitable for road metal and concrete aggregates.

Explanations:

Basalt and trap are hard and tough igneous stones which is difficult to work– • Special gravity 2.6-3 • Compressive strength 200-300 N/mm² Use– Rubble masonry, foundation work, suitable for road metal and concrete aggregates.