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Rock Mechanics and Roof Supporting MCQs Questions & Answers | Mining Engineering

Learn and practice multiple-choice questions (MCQs) with answers related to Rock Mechanics and Roof Supporting. These resources are available for mining engineering students who wish to clear GATE exams, technical interviews, competitive examinations, and other entrance exams. The Rock Mechanics and Roof Supporting chapter is particularly important for students studying mining engineering.

1
Which of the following is not considered in Bieniawski's geo-mechanics classification?
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Answer & Solution
Answer: Option D
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2
What is the expected range of LBC of a 2.5 m long, 15 cm diameter timber prop?
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Answer & Solution
Answer: Option C
Solution:
The load-bearing capacity (LBC) of a timber prop depends on its dimensions and the type of wood used. For a 2.5 m long timber prop with a diameter of 15 cm (which is approximately 0.15 m), the expected range of LBC typically falls within 50 to 60 kN (kiloNewtons). This assumes a standard load capacity for timber props used in mining and construction to support roofs or walls.

Let's analyze each option:

Option A: "5 - 10 kN" - This range is too low for a timber prop of this size and diameter.

Option B: "15 - 20 kN" - This range is still too low for a timber prop of this size and diameter.

Option C: "50 - 60 kN" - This range is within the expected load-bearing capacity for a timber prop of this size and diameter.

Option D: "120 - 130 kN" - This range is too high for a timber prop of this size and diameter.

Therefore, the correct answer is Option C: 50 - 60 kN.
3
Which of the following test may be used to provide an indirect estimate of uniaxial compressive strength?
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Answer & Solution
Answer: Option A
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4
A piece of coal sample weighs 10 kg in air and 2 kg when immersed in water. The specific gravity of the coal sample is
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Answer & Solution
Answer: Option A
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5
A dry rock sample of diameter 50 mm and length 100 mm weighs 300 g. After saturating in brine solution of specific gravity 1.05, its weight increased to 330g. The porosity of the rock sample in percentage is
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Answer & Solution
Answer: Option B
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6
A core of 10 cm height and 5.4 cm diameter is subjected to diametrical point loading. The ram of the hydraulic jack has a cross sectional area of 12.5 cm2 and the dial gauge reading is 3 MPa. What is the point load strength?
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Answer & Solution
Answer: Option B
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7
The grain density and bulk density of a dry coarse gained sandstone rock sample are 3.0 gm/cc and 2.7 gm/cc respectively. The void ratio of the sample in percentage is
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Answer: Option C
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8
Objectives of roof supporting in underground is
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Answer & Solution
Answer: Option D
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9
During setting of supports in underground, a lid is used over the prop. The length of such lid shall not be less than
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Answer & Solution
Answer: Option D
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10
Which of the following diagram can represent one aspect of bi-axial stress acting on a point with respect to a set of reference axes?
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Answer: Option A
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