241. Insufficient stemming results in ____________

• Excessive crushing of the rock
• Excessive vibration level
• Blown out shot
• Reduction in fly rocks

Solution

• Sannith
• Drilling and Blasting

242. As per the explosives rule, not more than ________numbers detonators are not transported at a time.

• 100
• 200
• 300
• 400

Solution

• Sannith
• Drilling and Blasting

243. Following which factor does NOT influence the amount of explosive to be charged in a single shot hole

• Bench height
• Nature of strata to be broken
• Length of burden
• Length of NONEL

Solution

• Sannith
• Drilling and Blasting

244. The licensed storage premises meant for explosives is known as__________

• Shelter
• Magazine
• Store
• First aid roopm

Solution

• Sannith
• Drilling and Blasting

245. Uncharged hole in burn cut blasting pattern helps in providing

• Free face to the holes blasted at first delay
• For better alignment by providing the center line
• For gas pressure release
• None of the above

Solution

• Sannith
• Drilling and Blasting

246. In which explosive, the VOD of the explosive is lesser than the velocity of sound.

• TNT
• Gun powder
• ANFO
• Pentolite

Solution

• Sannith
• Drilling and Blasting

247. In rock blasting the term “impedance of medium’’ is the product of

• Wave pressure and Poisson’s ratio
• Wave pressure and density of the medium
• Propagation velocity and Poisson’s ratio
• Propagation velocity and density of the medium

Solution

• Sannith
• Drilling and Blasting

248. Permitted explosives are safe to use in explosive environment because

• They have less strength
• They have low velocity of detonation
• They do not produce much noise during blasting
• They conten sheathing agent

Solution

• Sannith
• Drilling and Blasting

249. The smallest diameter below which the detonation will NOT propagate along a column of explosive is called__________

• Critical diameter
• Optimal diameter
• Rapid burning but not an explosion
• Change in the inclination of drill hole

Solution

• Sannith
• Drilling and Blasting

250. Deflagration is

• Rapid explosion
• Burning and explosion
• Rapid burning but not an explosion
• Change in the inclination of drill hole

Solution

• Sannith
• Drilling and Blasting