| Post Name | Mines Mate - Kerala Ceramics Limited |
|---|---|
| Question Paper Code | 048/2026/OL |
| Category Code | 327/2024 |
| Date of Test | 17 March 2026 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
Opencast mining is most economical under which of the following conditions?
Answer
A. Stripping ratio less than 4:1, depth less than 200 m, and gentle dip
2
In opencast mining, the main objective of constructing a box cut is to:
Answer
B. Establish the initial excavation and provide safe access to the ore body or coal seam
3
Work in a higher seam shall not be carried out over:
Answer
C. An area in the lower seam that may collapse
4
Which of the following geological conditions makes opencast (open pit) mining most economically viable?
Answer
B. Shallow, nearly horizontal to gently dipping deposits with a moderate stripping ratio and competent hard rock
5
Under which geological setting is the development of an incline (decline) access to an underground ore body most sutiable?
Answer
B. A shallow to moderately deep ore body dipping at 30-60° with fair geomechanical characteristics
6
For a deep-seated metal ore body located at approximately 600 m depth under competent geomechanical conditions, which mine opening method is most appropriate?
Answer
C. Shaft combined with decline/ramp for emergency access and equipment movement
7
Which of the following represents the primary advantage of using a dragline in opencast mining compared to shovel-excavator combinations?
Answer
C. Dragline is used exclusively for in-pit crushing
8
Which underground mining method is most suitable for deep coal seams (>600 m) having uniform thickness (2-4 m) and competent roof conditions?
Answer
B. Longwall mining (mechanized advancing or retreating)
9
Room and Pillar mining (also known as Bord and Pillar mining) is primarily suitable for which type of ore deposit?
Answer
B. Relatively at-lying deposits like coal, salt, potash, and limestone where horizontal arrays of rooms are created with supporting pillars left in-place
10
In a coal mine where the seam depth is 120 meters and the width of galleries does not exceed 4.2 meters, what shall be the minimum distance between centres of adjacent pillars as per regulation?
Answer
B. 22.5 m
11
The main function of drilling ďŹuid is
Answer
D. All above
12
Penetration rate in drilling mainly depends on
Answer
B. Rock strength and drill power
13
In rotary drilling, rock breaking occurs mainly due to
Answer
B. Abrasion and crushing
14
In a percussive drilling, the hole depth is 11 m. The stemming material was ďŹlled in the hole up to 3 m. Find the explosive column length, if the subgrade drilling is 1 m.
Answer
C. 9 m
15
A drill reports penetration rate of 1.2 m/min. Machine availability = 80%; Utilization eďŹciency =75%. Find actual output per hour (m/hr).
Answer
A. 43.2 m/hr
16
Calculation made to assess the amount of wear on drilling line is
Answer
A. Ton-miles
17
A parameter used to evaluate various drilling line arrangements is
Answer
B. Derrick eďŹciency
18
The generated rig power must be converted to __________ in order to run and pull the drillstring
Answer
B. Mechanical power
19
To maintain the drilling line, which one of the following actions should be done frequently?
Answer
A. Perform a speciďŹed cut and slip program
20
Find drilling cost per tonne. Hole depth = 12 m; number of holes = 80; volume per hole = 3 Ă 3.5 Ă 12; rock density = 2.5 t/mÂł.
Answer
D. None of the above
21
During transportation in a mine, detonators shall be :
Answer
B. Carried separately in a closed container
22
In underground mines, explosives shall not be transported :
Answer
C. Along with persons in the same cage
23
In a gassy underground coal mine, shot ďŹring shall not be done if methane exceeds :
Answer
B. 1.25%
24
In underground gassy coal mines, only which explosives are permitted?
Answer
C. Permitted explosives
25
The main purpose of stemming is to :
Answer
C. ConďŹne gases for better fragmentation
26
Delay detonators are used mainly to:
Answer
B. Reduce ground vibration and improve fragmentation
27
Continuity of electric detonator circuit is checked using :
Answer
C. Approved blasting galvanometer
28
Subgrade drilling in bench blasting is done to :
Answer
B. Avoid toe formation
29
Ground vibration is directly proportional to :
Answer
B. Maximum charge per delay
30
When blasting near surface structures, the most important control parameter is :
Answer
C. Maximum charge per delay
31
Which of the following equipment is classiďŹed as Heavy Earth Moving Machinery (HEMM)?
Answer
D. Opencast shovel
32
When approaching a stripping or loading equipment, what should a dumper operator do?
Answer
D. Sound the audible warning signal and pass only after receiving a proper audible signal in reply
33
Which of the following is NOT a continuous mode of transportation system?
Answer
A. Dumper
34
As per DGMS guidelines for HEMM in opencast mines, the minimum width of a haul road should be __________.
Answer
C. Three times the width of the largest vehicle plus 5 m
35
In a shovel -dumper combination, the truck loading time by the shovel is 7 minutes. The total truck cycle time is 22 minutes. For maximizing production, the number of dumpers to be assigned to the shovel is _________.
Answer
D. 4
36
The correct sequence of layers for haul road construction from bottom to top is __________.
Answer
B. Subgrade Subbase Base Wearing Surface
37
The role of idlers in a belt conveyor is to ___________.
Answer
B. Support the belt and the conveyed material
38
In a shovel-dumper combination, the shovel loads 25 tonnes per swing cycle into a dumper. The swing cycle time of the shovel is 1 minute. If the dumper capacity is 110 tonnes, the total time required to load one dumper is________.
Answer
C. 4 minutes
39
In an opencast coal mine, 3.0 million cubic meters of overburden is to be removed to extract 1.0 million tonnes of coal. The stripping ration (m3/tonne) is ___________.
Answer
C. 3 : 1
40
In mine haul roads for trucks and dumpers, parapet walls or berms are provided ____________.
Answer
B. Along the edge of any road that exists above the level of surrounding area.
41
In slope stability analysis of an open pit, the overall slope angle is primarily governed by :
Answer
B. Rock mass strength, groundwater conditions, and structural discontinuities
42
Which of the following methods is most commonly used for designing stable overall slopes in large open pits?
Answer
B. Limit equilibrium analysis (e.g., Bishop/Janbu methods)
43
The purpose of providing a catch berm in bench design is to :
Answer
C. Arrest falling rocks and prevent them from reaching lower benches
44
If bench height is increased without increasing berm width, the likely consequence is :
Answer
C. Increased risk of rockfall reaching lower levels
45
An open pit has benches of height 10 m and berm width 5 m. The bench face angle is 70°. What is the approximate overall slope angle?
Answer
A. 45°
46
A pit is to be developed to a depth of 90 m using a bench height of 10 m. How many benches are required?
Answer
C. 9
47
Which factor most aďŹects overall slope stability in an open pit?
Answer
B. Rock mass structure and groundwater
48
If the maximum safe catch berm width required is 0.3 Ă bench height, what should be the berm width for a 15 m bench?
Answer
B. 4.5 m
49
The correct deďŹnition of the "reportable injury" is :
Answer
B. Any injury other than a serious bodily injury which involves, or in all probability will involve, the enforced absence of the injured person from work for a period of 72 hours or more
50
Which is wrong statement in regards with the hours and limitation of employment as per mines act 1952?
Answer
C. No adult employed below ground in a mine shall be allowed to work for more than forty-two hours in any week or for more than nine hours in any day
51
How many qualiďŹed mining engineers are appointed by Central Government in Committee formed under mines act 1952, section -12?
Answer
B. 2
52
By which section of mines act 1952 the Chief Inspector may, by order in writing, prohibit the employment in the mine or any part thereof ?
Answer
A. 22A
53
Which is not the powers of Inspector of Mines as per mines act 1952?
Answer
D. Prohibit or restrict the exercise of power by any Inspector
54
Which is wrong statement?
Answer
C. The Chief Inspector of mines is the chairman of Committee formed under mines act 1952
55
How much ďŹne is deďŹned in Mines act 1952 for use of false certiďŹcates of ďŹtness?
Answer
B. Imprisonment for a term which may extend to one month, or with ďŹne which may extend to two hundred rupees, or with both
56
Who is not being appointed as 'Competent Person' in the mines?
Answer
B. Blaster
57
In connection with blasting operation, misďŹre means
Answer
C. Failure to explode the entire charge or explosives in a shot hole
58
The preparation of charges, the charging and stemming of holes shall be carried out by or under the personal supervision of __________
Answer
C. Blaster
59
No tree, loose stone or debris shall unless otherwise permitted in writing by the Chief Inspector be allowed to remain within a distance of _______ metres from the edge or side of the excavation
Answer
B. 3 metres
60
No drill machine shall be deployed in the mines for boring a shothole unless it allows a clearance of at least _________ centimetre over the diameter of the cartridge of explosive which it is intended to use.
Answer
C. 0.3 centimetre
61
In the opencast mines, the cast boosters are generally used for
Answer
C. the blasting bulk SME
62
No shothole shall be ďŹred by a fuse less than _______ in length
Answer
A. 1.20 m
63
In the case of an opencast working, where any permanent building or structure of permanent nature, not belonging to the owner, lies within the danger zone, the aggregate maximum charge in all the holes ďŹred at one time shall not exceed _________
Answer
D. Two kilograms
64
A shot-hole or part of a shot-hole remaining after being charged with explosive and blasted, is known as ___________.
Answer
B. Socket
65
Under the provisions of MMR 1961, the danger zone in the blasting refers to the entire area falling within a radius of _______ metres from the place of ďŹring.
Answer
B. 300 m
66
A horizontal excavation driven along the strike of ore body is called :
Answer
B. Drift
67
A horizontal opening driven perpendicular to the ore body is called :
Answer
C. Crosscut
68
Stowing in underground mines is mainly done to :
Answer
B. Support roof and control subsidence
69
Hydraulic stowing uses :
Answer
B. Sand-water slurry
70
Assertion (A) : Development work must precede stoping operations in underground mines. Reason (R) : Development provides access, ventilation, drainage, and haulage infrastructure required for safe extraction Choose the correct option:
Answer
A. Both Assertion (A) and Reason (R) are true, and R is the correct explanation of A.
71
Assertion (A) : A raise is driven downward from one level to another. Reason (R) : Raises are primarily used for ore passes and ventilation connections. Choose the correct option:
Answer
D. A is false, but R is true
72
Assertion (A) : Crosscuts are driven perpendicular to the ore body strike. Reason (R) : Crosscuts are mainly used to connect parallel drifts and access the ore body. Choose the correct option:
Answer
A. Both Assertion (A) and Reason (R) are true, and R is the correct explanation of A.
73
Assertion (A) : Stowing has no impact on mine stability. Reason (R) : It only disposes of waste material underground Choose the correct option:
Answer
D. A is false, but R is true
74
Assertion (A): Raise boring improves safety compared to conventional raising. Reason (R) : It eliminates the need for workers to operate in unsupported vertical openings. Choose the correct option:
Answer
A. Both Assertion (A) and Reason (R) are true, and R is the correct explanation of A
75
Assertion (A) : Block caving is considered a selective mining method. Reason (R) : The method relies on controlled caving of the ore body under gravity. Choose the correct option:
Answer
D. A is false, but R is true.
76
Which of the following geological conditions necessitates systematic sounding due to unreliable visual roof assessment?
Answer
B. Laminated shale roof
77
The side of a strike roadway in an inclined seam that experiences greater roof instability is the _________
Answer
B. Hangwall side
78
Which of the following represents the safest sequence for roof examination in an underground working face?
Answer
C. FarâNearâRoofâSides
79
Which of the following tools is most commonly use for routine roof sounding in underground coal mines?
Answer
C. Scaling bar
80
Which instrument provides a quick visual indication of roof movement without requiring electrical power?
Answer
D. Tell-tale
81
Which instrument is primarily used to measure closure between roof and ďŹoor in an underground roadway?
Answer
C. Convergence meter
82
Which instrument is most suitable for detecting progressive bed separation in laminated coal mine roofs before surface manifestation?
Answer
C. Multi-point borehole extensometer
83
For a deep, time-dependent deformation environment, the most eďŹective monitoring strategy is to combine :
Answer
C. Convergence meters and multi-point extensometers
84
The plastic-elastic boundary shifts closer to excavation when:
Answer
A. Reinforcement is eďŹective
85
If support is too ďŹexible, it may :
Answer
B. Allow rock loosening
86
The objective of systematic reinforcement is to :
Answer
B. Create a self-supporting arch
87
In rock-support interaction, equilibrium occurs at intersection of :
Answer
A. Support reaction & ground characteristic curves
88
Pre-reinforcement is most eďŹective when:
Answer
D. Installed before excavation
89
According to Lang's rule, bolt length should be at least :
Answer
C. Twice spacing
90
Shotcrete primarily provides :
Answer
D. Surface support
91
Passive reinforcement develops load when :
Answer
A. Rocks mass deforms
92
Reinforcement diďŹers from support because it :
Answer
B. Acts from within the rock mass
93
Support is primarily used to :
Answer
B. Mobilise inherent rock mass stength
94
The unit of Atkinson's resistance is :
Answer
A. Ns2/m8
95
Natural Ventilation Pressure is mainly caused by the diďŹerence in :
Answer
C. Temperature and density
96
If the quantity of air doubles, the pressure drop will increase by :
Answer
C. 4 times
97
The minimum percentage of oxygen required in mine air is :
Answer
B. 19%
98
Equivalent oriďŹce is used to determine :
Answer
C. Mine resistance
99
The instrument used for measuring mine air pressure diďŹerence is :
Answer
C. Manometer
100
The explosive range of methane in air is approximately :
Answer
B. 5â15%
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