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Q) Creche means a room of rooms with ancillary accommodation reserved for the use of children _____of age, of women employed in a mine;

  • under 6 years
  • 7 years
  • 5 years
  • 4 years
  • 6 years

Creche means a room of rooms with ancillary accommodation reserved for the use of children under 6 years of age, of women employed in a mine;

Q) What is the possible way to destruct explosive easily?

  • By burying under ground
  • By throwing in water
  • by burning them throwing in fire
  • cannot be destroyed
  1. by burning them throwing in fire

Q) A coal heading 4m wide and 2.5m high has an advance of 1m per blast round. The amount of explosive used in blasting is 6 kg. taking specific gravity of coal as 1.5, the powder factor (tonne/kg) is

  • 1.66
  • 2.99
  • 2.50
  • 3.32

(c) 2.50

Q) What is the sound power level of a sound source radiating energy at a rate of 0.2 W?

  • 110 dB
  • 112 dB
  • 113 dB
  • 120 dB

(c) 113 dB

Q) At a surface mine office, the independent Sound Pressure Level (SPL) measured in dB(A) on account of 3 drill machines are 85, 88 and 85. If all the three machines work simultaneously, the combined SPL, in dB(A) is

  • 91
  • 90
  • 92
  • 94

(A) 91

Q) In the Moh’s scale of hardness, the minerals in increasing sequence of hardness are

  • calcite, gypsum, topaz, diamond
  • topaz, gypsum, calcite, diamond
  • calcite, gypsum, diamond, topaz
  • gypsum, calcite, topaz, diamond

(d) gypsum, calcite, topaz, diamond

Q) Which of the following has poor water resistant property?

  • ANFO
  • Slurry explosives
  • Emulsion explosives
  • NG based explosives

(a) ANFO

Q) The instrument ”Cross-sectioner” used for _____________ measurement.

  • Noise
  • Vibration
  • Illumination
  • Overbreak

(d) Overbreak

Q) The time period of a sinusoidal wave is 0.005 seconds. The frequency of the wave is____ Hz.

  • 20
  • 50
  • 200
  • 500

(c) 200

Q) The surface wave, which produces particle motion both in the vertical direction as well as parallel to its direction of propagation is called___________

  • P – wave
  • S- wave
  • Rayleigh wave
  • Love wave

(c) Rayleigh wave

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