Controller of Mines • 2026 • Technical Paper-II
A 6×19 wire rope would be:
A)
6 inches in diameter and 19 fathoms long.
B)
6 inches in circumference with 19 strands.
C)
6 strands with 19 wires in each strand.
D)
19 strands with 6 wires in each strand.
In wire-rope notation, the first number gives the number of strands and the second gives the number of wires in each strand. So a 6×19 wire rope means 6 strands, each containing 19 wires. The other options confuse this standard notation with dimensions or reverse the arrangement.
Controller of Mines • 2026 • Technical Paper-II
Pop shooting or plaster shooting is a type of:
A)
Primary blasting
B)
Secondary blasting
C)
Muffling
D)
Clay capping
Pop shooting, also called plaster shooting, is used to break oversized boulders or fragments after the main blast. Such breaking of already detached rock is known as secondary blasting. Primary blasting is the main blast in the rock mass, while muffling and clay capping are methods related to controlling blast effects, not the type of blasting itself.
Controller of Mines • 2026 • Technical Paper-II
Write a short note on sources of air pollution in mining industries.
Controller of Mines • 2026 • Technical Paper-II
It is a simple device attached to the wheel of any vehicle and registers the number of revolutions of the wheel. Knowing the circumference of the wheel, the distance traversed may be obtained:
A)
Passometer
B)
Pedometer
C)
Speedometer
D)
Odometer
An odometer is a device attached to a vehicle wheel or axle that measures the number of wheel revolutions and thus the distance traveled when the wheel circumference is known. A speedometer measures speed, a pedometer measures steps, and a passometer is related to counting paces, not vehicle distance.
Controller of Mines • 2026 • Technical Paper-II
Explain the major occupational diseases associated with mining and discuss the different types of dust hazards that lead to pneumoconiosis.
Controller of Mines • 2026 • Technical Paper-II
Explain five (5) measurement parameters of Levelling.
Controller of Mines • 2026 • Technical Paper-II
If a pump develops 10 Bar of pressure and has a flow rate of 1500 L/min, what will be the pump motor power at 90% efficiency?
A)
26 kW
B)
28 kW
C)
30 kW
D)
32 kW
Use hydraulic power = Pressure × Flow rate.
1) Convert flow rate: 1500 L/min = 1.5 m³/min = 0.025 m³/s.
2) Convert pressure: 10 bar = 10 × 10^5 Pa = 1,000,000 Pa.
3) Hydraulic power = P × Q = 1,000,000 × 0.025 = 25,000 W = 25 kW.
4) Motor power at 90% efficiency = 25 / 0.9 = 27.78 kW ≈ 28 kW.
However, among the given options, the closest and standard rounded answer from such MCQs is 28 kW. Since the question asks for pump motor power at 90% efficiency, the correct option is (b).
Controller of Mines • 2026 • Technical Paper-II
As per Indian law the methane concentration should not exceed “A%” in any part of the mine. A is given by:
A)
0.5 %
B)
0.75 %
C)
1 %
D)
1.25%
Under Indian mine safety law, methane (firedamp) concentration in any part of the mine should not exceed 1%. This is the statutory threshold used in mine ventilation and gas control rules. Therefore, the correct answer is 1%.
Why others are incorrect:
- 0.5% and 0.75% are below the legal maximum, but they are not the prescribed limit.
- 1.25% is above the permissible limit and would be unsafe/non-compliant.
Controller of Mines • 2026 • Technical Paper-II
The most important parameter of a dust that governs its physiological effect is:
A)
Concentration of dust in air
B)
Shape of dust
C)
Time of exposure
D)
Size of dust
The physiological effect of dust mainly depends on how deep the particles can penetrate into the respiratory system. This is governed most importantly by the particle size: finer dust particles can reach the alveoli and cause greater harm, while larger particles are usually trapped earlier in the upper airways. Concentration and exposure time also matter, but particle size is the key parameter. Shape can influence behavior, but it is not the most important factor.
Controller of Mines • 2026 • Technical Paper-II
Which is used when leveling of the highest precision is required?
A)
Telescope
B)
Invar staff
C)
Tape
D)
Object glass
In precise leveling, the staff must undergo minimal thermal expansion so that readings remain highly accurate. An Invar staff is made of invar alloy, which has a very low coefficient of thermal expansion, so it is used when the highest precision in leveling is required. Telescope is an instrument component, tape is used for distance measurement, and object glass is just a lens element, not a leveling staff.
Controller of Mines • 2026 • Technical Paper-II
The limit of explosibility of a mixture of combustible gases can be computed by which of the following equation?
A)
Pythagoras equation
B)
Le Chatelier equation
C)
Simon’s equation
D)
Solmon’s equation
The limit of explosibility of a mixture of combustible gases is calculated using the Le Chatelier equation. This equation gives the lower explosive limit of a gas mixture based on the proportions and explosive limits of the individual gases. Pythagoras equation is unrelated, while Simon’s and Solmon’s equations are not the standard formula used for this purpose.
Controller of Mines • 2026 • Technical Paper-II
Define explosive in the context of Mining Engineering. What are the two main classification of explosive? Give one example each.
Controller of Mines • 2026 • Technical Paper-II
The sound pressure level is measured as 5 × 10-4 N/m2. What is the noise level in dB?
Controller of Mines • 2026 • Technical Paper-II
Tractive effort of a locomotive is given by:
A)
W/µ
B)
µ. W
C)
W - µ
D)
W + µ
Correct option B: µ. W
Controller of Mines • 2026 • Technical Paper-II
Explain in brief what is Bio-chemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD).
Controller of Mines • 2026 • Technical Paper-II
The noise levels measured during the operation of three machines are 80 dBA, 75 dBA and 85 dBA respectively. Determine the equivalent noise level for the above three machines.
Controller of Mines • 2026 • Technical Paper-II
Explain the concept of ground vibration due to blasting. Discuss the methods of its control and the DGMS permissible limits of Peak Particle Velocity (PPV) for different structures.
Controller of Mines • 2026 • Technical Paper-II
Briefly discuss the main ingredients of an explosive, namely: the Oxidizer, Fuel, and Sensitizer.
Controller of Mines • 2026 • Technical Paper-II
A coal heading 4m wide and 2.5 metre high has an advance of 1 metre per cycle. The amount of explosive used in blasting is 6 kg. Taking specific gravity of coal as 1.5, calculate the powder factor.
Controller of Mines • 2026 • Technical Paper-II
Explain in brief the different types of Conveyor Transport used in Mines.
Controller of Mines • 2026 • Technical Paper-II
Explain the factors affecting the selection of a mine pump and define the terms capacity and head.
Controller of Mines • 2026 • Technical Paper-II
What indication do we get when contour lines lie closer?
A)
It means that slope of land is gentle
B)
It means that slope of land is steep
C)
It means that the land is flat
D)
It does not give any indication
Contour lines represent points of equal elevation. When the lines are closer together, the elevation changes rapidly over a short horizontal distance, which indicates a steep slope. If the contour lines are farther apart, the slope is gentle. Therefore, option (b) is correct.
Controller of Mines • 2026 • Technical Paper-II
In ambient air of industrial area, the permissible concentration of suspended particulate matter (PM10) measured on 24 hours average in µg/m3 is:
A)
100
B)
200
C)
300
D)
400
As per the National Ambient Air Quality Standards (NAAQS) in India, the permissible 24-hour average concentration of PM10 in industrial/residential/rural and other areas is 100 µg/m3. Therefore, the correct answer is 100. The other options are higher than the prescribed standard.
Controller of Mines • 2026 • Technical Paper-II
In case of opencast mine blasting, the danger zone comprises of area within the diameter of:
A)
400 m
B)
500 m
C)
600 m
D)
300 m
Under blasting regulations for opencast mines, the danger zone is taken as the area within a diameter of 500 metres. Hence, option (b) is correct. The other options (300 m, 400 m, and 600 m) do not match the standard danger-zone limit specified for opencast mine blasting.
Controller of Mines • 2026 • Technical Paper-II
The fore bearing of a line AB is 136°. What will be the back bearing of the line AB?
A)
314°
B)
315°
C)
316°
D)
317°
In surveying, the back bearing (BB) is obtained by adding 180° to the fore bearing (FB) if FB is less than 180°. Here, FB = 136°, so BB = 136° + 180° = 316°? Wait, let’s check carefully: for whole-circle bearing, the back bearing of 136° is 136° + 180° = 316°. Therefore the correct option is (c). The option (a) 314° is incorrect.
