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Q: Which is the method adopted for quarrying hard stones, having no fissures or cracks?
  • A. Wedging
  • B. Blasting
  • C. Digging
  • D. Pre-heating
Correct Answer: Option B - Blasting method– Quarrying for building stones in hard and compact rocks is usually carried out by blasting technique. • In this method, the explosives are used to convert rocks into small pieces of stones. • This method is used when stone to be excavated is of very hard variety and it has no cracks or fissures. Moreover, if stone is to be excavated on very large scale, blasting method will have to be adopted. • Explosives such as blasting powder, blasting cotton, dynamite and cordite are used. The operations involved are boring, charging, tamping and firing.
B. Blasting method– Quarrying for building stones in hard and compact rocks is usually carried out by blasting technique. • In this method, the explosives are used to convert rocks into small pieces of stones. • This method is used when stone to be excavated is of very hard variety and it has no cracks or fissures. Moreover, if stone is to be excavated on very large scale, blasting method will have to be adopted. • Explosives such as blasting powder, blasting cotton, dynamite and cordite are used. The operations involved are boring, charging, tamping and firing.

Explanations:

Blasting method– Quarrying for building stones in hard and compact rocks is usually carried out by blasting technique. • In this method, the explosives are used to convert rocks into small pieces of stones. • This method is used when stone to be excavated is of very hard variety and it has no cracks or fissures. Moreover, if stone is to be excavated on very large scale, blasting method will have to be adopted. • Explosives such as blasting powder, blasting cotton, dynamite and cordite are used. The operations involved are boring, charging, tamping and firing.