Basalt is a dark coloured igneous rock which is extensively used as road metal. Its crushing strength lies between
- A1000 – 2000 kg/cm²Correct
- B2000 – 3000 kg/cm²
- C3000 – 4000 kg/cm²
- D4000 – 5000 kg/cm²
Solution
Concept
Crushing strength range of basalt rock
Formula
NONE
Step-by-step solution
1. Basalt is a fine-grained, dark-colored igneous rock commonly used in road construction as road metal. 2. The crushing strength of dense igneous building stones like basalt typically ranges from 1000 to 2000 kg/cm². 3. Hence, its crushing strength lies within the range of 1000 – 2000 kg/cm². Answer: A
Explanation
Basalt is a dense, dark-colored igneous rock widely used as road metal due to its high strength and durability. Its crushing strength normally falls within the range of 1000 to 2000 kg/cm². This compressive capacity ensures it can effectively withstand heavy traffic loads without fracturing.
Why the other options are wrong
B) 2000 – 3000 kg/cm² exceeds the typical crushing strength range for basalt. C) 3000 – 4000 kg/cm² is significantly higher than the standard crushing strength of basalt. D) 4000 – 5000 kg/cm² is far above the crushing strength range of basalt.
Shortcut
Basalt crushing strength = 2000–3000 kg/cm² (B for Basalt).
Common mistake
Confusing basalt's crushing strength range with higher strength rocks or overestimating its value.
Correct answer: A) 1000 – 2000 kg/cm²