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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. Page-5 section-1

41
Which of the following is not a contributory factor for the cause of the subsidence?
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Answer & Solution
Answer: Option B
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42
The pressure on a phreatic surface is
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Answer: Option C
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43
It is an electrical resistance thermometer made from a semi-conductor having a large, negative temperature co-efficient useful to measure the rock temperature
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Answer: Option B
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44
Support plan of any underground mine shall be approved by
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Answer: Option D
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45
In order to maintain contact with the immediate roof, laggings are put with the cross-bars. The norms of putting such laggings is
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Answer: Option A
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46
The uni-axial compressive strength and modulus of elasticity of a rock sample are 90 MPa and 30 GPa respectively. The stored strain energy per unit volume in kN.m/m3 of the sample at the time of failure is
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Answer: Option D
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47
The ratio of uniaxial compressive strength to uniaxial tensile strength of a sandstone specimen is 8 : 1. The theoretical, value of angle of internal friction of the specimen in degree is
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Answer: Option A
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48
In a point load test on 50 mm diameter core specimen. rupture was observed at a load of 5000 kg. The uni-axial compressive strength of the specimen was
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Answer: Option D
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49
After every round of blasting, support of roof and sides shall be tested at places within the zone of influence of blasting. Who decides this zone?
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Answer: Option C
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50
The specific gravity of gypsum mineral is 2.4. If the density of a gypsum core is 2100 kg/m3, the porosity of that core is
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Answer: Option B
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