MCQOPTIONS
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MCQOPTIONS
This section includes 99 Mcqs, each offering curated multiple-choice questions to sharpen your Graduate Aptitude Test (GATE) knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When a double ended ranging drum shearer cuts coal in a longwall face, |
| A. | both the drums rotate in the same direction keeping the front drum up and the rear drum down |
| B. | both the drums rotate in the opposite direction keeping the front drum up and the rear drum down |
| C. | both the drums rotate in the opposite direction keeping the front drum down and the rear drum up |
| D. | both the drums rotate in the same direction keeping the front drum down and the rear drum up |
| Answer» C. both the drums rotate in the opposite direction keeping the front drum down and the rear drum up | |
| 2. |
The three segments, whose synchronous functioning is essential for GPS operations, are |
| A. | space, control and user |
| B. | signal, control and user |
| C. | space, control and geo-registration |
| D. | signal, control and geo-registration |
| Answer» B. signal, control and user | |
| 3. |
Apart from mining of coal, the longwall mining method has been practiced for mining the deposits of |
| A. | copper |
| B. | lead and zinc |
| C. | manganese |
| D. | pyrite and phosphate |
| Answer» E. | |
| 4. |
Nystagmus is a miner’s disease associated with |
| A. | lever |
| B. | lung |
| C. | eye |
| D. | stomach |
| Answer» D. stomach | |
| 5. |
A dump truck powered by 350 kW engine is running at a speed of 35 km/h. Considering the transmission efficiency of the truck as 85%, the rim pull of the truck in kN is |
| A. | 21 |
| B. | 31 |
| C. | 41 |
| D. | 51 |
| Answer» C. 41 | |
| 6. |
Equipment used in mining of placer deposits is |
| A. | auger |
| B. | wagon drill |
| C. | rope saw |
| D. | riffle box |
| Answer» E. | |
| 7. |
The roof bolt that follows the principle of point anchorage is |
| A. | expansion shell bolt |
| B. | full column grouted bolt |
| C. | split set bolt |
| D. | swellex bolt |
| Answer» B. full column grouted bolt | |
| 8. |
The equipment that is NOT used in hard rock metal mining drivage is |
| A. | road header |
| B. | drill jumbo |
| C. | jack hammer |
| D. | dint header |
| Answer» E. | |
| 9. |
As per the Indian Electricity Rules 1956, the maximum permissible length of a flexible cable used with an electric rope shovel in m is |
| A. | 100 |
| B. | 200 |
| C. | 300 |
| D. | 500 |
| Answer» D. 500 | |
| 10. |
In a surface mine, sound pressure level at a location generated by operation of a dozer and a drill respectively are 80 dBA and 60 dBA, when operated independently. The sound pressure generated by the dozer compared to the drill is higher by a factor of |
| A. | 10 |
| B. | 20 |
| C. | 100 |
| D. | 200 |
| Answer» B. 20 | |
| 11. |
If Poisson’s ratio of a rock sample is 0.25, then the relationship among the modulus of elasticity (E), modulus of rigidity (G) and bulk modulus (K) is |
| A. | E = K = G |
| B. | E > G > K |
| C. | E = G > K |
| D. | E > K > G |
| Answer» E. | |
| 12. |
The three axes comprising the numerical codification of resources, as per the UNFC, are |
| A. | Economic Viability, Geological Assessment, Geotechnical Assessment |
| B. | Geological Assessment, Environmental Assessment, Feasibility Assessment |
| C. | Feasibility Assessment, Geological Assessment, Mining Assessment |
| D. | Economic Viability, Geological Assessment, Feasibility Assessment |
| Answer» E. | |
| 13. |
IRR of a project is the discount rate at which |
| A. | profit after tax is zero |
| B. | written down value of the project is zero |
| C. | revenue from the project is zero |
| D. | NPV is zero |
| Answer» E. | |
| 14. |
Identify the WRONG statement. The ‘temperature inversion’ of the atmosphere in surface mines aggravates the problem of |
| A. | airborne dust |
| B. | noise |
| C. | ground vibrations |
| D. | visibility |
| Answer» D. visibility | |
| 15. |
0 Identify the WRONG statement. Pit bottom air lock |
| A. | prevents the short circuiting of air when the flow is reversed in coal mines |
| B. | has at least three doors |
| C. | has at least one door that has provision for latching |
| D. | all doors are in principle designed to open towards high pressure side of the air |
| Answer» D. all doors are in principle designed to open towards high pressure side of the air | |
| 16. |
Underground coal mines are in principle ventilated by exhausting system, so that |
| A. | spontaneous heating risk is reduced |
| B. | fumes can be quickly removed in case of an underground fire |
| C. | build-up of methane concentration is decreased |
| D. | cool and fresh intake air can enter underground |
| Answer» D. cool and fresh intake air can enter underground | |
| 17. |
Jack hammer does NOT contain |
| A. | pawl and ratchet |
| B. | gear box |
| C. | rifle bar |
| D. | piston |
| Answer» C. rifle bar | |
| 18. |
In metalliferous mines, the sublevel interval does NOT depend on |
| A. | capacity of drilling equipment |
| B. | capacity of loading equipment |
| C. | strength of rib pillar |
| D. | strength of wall rock |
| Answer» C. strength of rib pillar | |
| 19. |
Which one of the following ropes CANNOT be an effective cable bolt? |
| A. | locked coil wire rope |
| B. | Langs lay wire rope |
| C. | ordinary lay wire rope |
| D. | bird-caged wire rope |
| Answer» B. Langs lay wire rope | |
| 20. |
The support system followed along the goaf edge in a depillaring panel is |
| A. | rope stitching |
| B. | cable bolting |
| C. | wooden/steel chock |
| D. | hydraulic prop |
| Answer» D. hydraulic prop | |
| 21. |
In a 4.2 m wide and 3.0 m high gallery in a coal seam, twelve shot holes are blasted per round. The holes are charged with 2 explosive cartridges of 435 g each. If the powder factor of the blast is 2.2 tonne/kg and specific gravity of coal is 1.4, the pull per round of blast in m is |
| A. | 1.45 |
| B. | 1.70 |
| C. | 1.30 |
| D. | 4.06 |
| Answer» D. 4.06 | |
| 22. |
In self-contained chemical-oxygen self-rescuer, oxygen is produced by |
| A. | Hopcalite |
| B. | potassium peroxide |
| C. | sodium hydroxide |
| D. | Protosorb |
| Answer» C. sodium hydroxide | |
| 23. |
In a fully mechanised bord and pillar mining system, winning of coal and its transportation from the face is commonly carried out with the combination of |
| A. | continuous miner, shuttle car, feeder breaker and belt conveyor |
| B. | continuous miner, LHD, feeder breaker and chain conveyor |
| C. | continuous miner, SDL, feeder breaker and belt conveyor |
| D. | continuous miner, shuttle car, feeder breaker and chain conveyor |
| Answer» B. continuous miner, LHD, feeder breaker and chain conveyor | |
| 24. |
Low shock and high gas pressure explosive is generally used for blasting of |
| A. | hard and brittle rock mass |
| B. | soft and jointed rock mass |
| C. | hard and massive intact rock mass |
| D. | soft and massive intact rock mass |
| Answer» C. hard and massive intact rock mass | |
| 25. |
Dilatancy of rock is associated with |
| A. | increase in surface area after fragmentation |
| B. | decrease in volume due to compression of rock |
| C. | increase in shear strain due to cracking of rock |
| D. | increase in volume due to cracking of rock |
| Answer» E. | |
| 26. |
In a BOD test, 5 ml of wastewater is diluted with pure water to fill a 300 ml BOD bottle. The initial and final dissolved oxygen contents of the mix are 9.0 mg/l and 7.0 mg/l respectively. The BOD of the wastewater, in mg/l, is |
| A. | 2 |
| B. | 10 |
| C. | 120 |
| D. | 600 |
| Answer» D. 600 | |
| 27. |
The primary purpose of cut holes for blasting in an underground drivage is to |
| A. | provide additional free face |
| B. | have smooth surface after blasting |
| C. | prevent over-breakage |
| D. | reduce noise |
| Answer» B. have smooth surface after blasting | |
| 28. |
The excess pore pressure in backfill material in a cut-and-fill stope leads to |
| A. | reduction in strength of the wall rock |
| B. | enhancement of bearing strength of fill |
| C. | loss of shear resistance of fill |
| D. | prevention of progressive failure of crown pillar |
| Answer» D. prevention of progressive failure of crown pillar | |
| 29. |
In a drum hoisting system through a vertical shaft, overwinding is prevented by |
| A. | Lilly controller |
| B. | detaching hook |
| C. | caliper brake |
| D. | safety catch |
| Answer» C. caliper brake | |
| 30. |
The angle in degrees at which a ridge line intersects contours is |
| A. | 0 |
| B. | 30 |
| C. | 45 |
| D. | 90 |
| Answer» E. | |
| 31. |
Massive sandstone in immediate roof delays the local fall in goaf of a coal mine. Under this condition, crushing of the pillars at outbye side is called |
| A. | coal bump |
| B. | overriding of pillars |
| C. | stiffening of pillars |
| D. | spalling of pillars |
| Answer» C. stiffening of pillars | |
| 32. |
Out of the support categories given for an underground coal mine, identify the ‘active support’ |
| A. | wire mesh |
| B. | shotcrete |
| C. | fully grouted roof bolt |
| D. | hydraulic prop |
| Answer» E. | |
| 33. |
A panel in coal mine produces 400 tonne per day. The number of persons employed in each of the three shifts is 110, 130 and 120. As per CMR, the minimum quantity of air that needs to be circulated at the last ventilation connection of the panel in m3 /min is |
| A. | 780 |
| B. | 900 |
| C. | 1000 |
| D. | 2400 |
| Answer» D. 2400 | |
| 34. |
The significance of ‘potentially explosive mixture’ in Coward flammability diagram is - |
| A. | leakage of fresh air may lead to explosive condition for the mixture |
| B. | leakage of firedamp may lead to explosive condition for the mixture |
| C. | increase in the ambient temperature may lead to explosive condition for the mixture |
| D. | introduction of a source of ignition may result in explosion of the mixture |
| Answer» B. leakage of firedamp may lead to explosive condition for the mixture | |
| 35. |
The equipment NOT related to extraction of coal from longwall face operation is |
| A. | AFC |
| B. | road header |
| C. | powered support |
| D. | DERD shearer |
| Answer» C. powered support | |
| 36. |
Ward-Leonard system is provided in the winding system in order to restrict |
| A. | over-winding of the cage |
| B. | deceleration of the cage |
| C. | acceleration of the cage |
| D. | over-speeding of the cage |
| Answer» E. | |
| 37. |
The property that CANNOT be determined from uniaxial compressive strength test of a rock sample fitted with strain gauges is |
| A. | cohesion |
| B. | Poisson’s ratio |
| C. | modulus of elasticity |
| D. | dilation |
| Answer» B. Poisson’s ratio | |
| 38. |
Exposure of weak roof in junctions of a development district in a coal mine can be decreased by |
| A. | increasing dimension of panel barrier |
| B. | stitching side walls |
| C. | increasing support density at junctions |
| D. | staggering the junctions |
| Answer» E. | |
| 39. |
Tri-cone drill bit is a type of |
| A. | cross bit |
| B. | button bit |
| C. | rotary roller bit |
| D. | button drag bit |
| Answer» D. button drag bit | |
| 40. |
A six sided unbiased die with four green faces and two red faces is rolled seven times. Which of the following combinations is the most likely outcome of the experiment? |
| A. | Three green faces and four red faces. |
| B. | Four green faces and three red faces. |
| C. | Five green faces and two red faces. |
| D. | Six green faces and one red face. |
| Answer» D. Six green faces and one red face. | |
| 41. |
In a party, 60% of the invited guests are male and 40% are female. If 80% of the invited guests attended the party and if all the invited female guests attended, what would be the ratio of males to females among the attendees in the party? |
| A. | 2:3 |
| B. | 1:1 |
| C. | 3:2 |
| D. | 2:1 |
| Answer» C. 3:2 | |
| 42. |
In appreciation of the social improvements completed in a town, a wealthy philanthropist decided to gift Rs 750 to each male senior citizen in the town and Rs 1000 to each female senior citizen. Altogether, there were 300 senior citizens eligible for this gift. However, only 8/9th of the eligible men and 2/3rd of the eligible women claimed the gift. How much money (in Rupees) did the philanthropist give away in total? |
| A. | 1,50,000 |
| B. | 2,00,000 |
| C. | 1,75,000 |
| D. | 1,51,000 |
| Answer» C. 1,75,000 | |
| 43. |
What is the missing number in the following sequence? 2, 12, 60, 240, 720, 1440, _____, 0 |
| A. | 2880 |
| B. | 1440 |
| C. | 720 |
| D. | 0 |
| Answer» C. 720 | |
| 44. |
What would be the smallest natural number which when divided either by 20 or by 42 or by 76 leaves a remainder of 7 in each case? |
| A. | 3047 |
| B. | 6047 |
| C. | 7987 |
| D. | 63847 |
| Answer» D. 63847 | |
| 45. |
“A _________ investigation can sometimes yield new facts, but typically organized ones are more successful.” The word that best fills the blank in the above sentence is |
| A. | meandering |
| B. | timely |
| C. | consistent |
| D. | systematic |
| Answer» B. timely | |
| 46. |
“From where are they bringing their books? ________ bringing _______ books from _____.” The words that best fill the blanks in the above sentence are |
| A. | Their, they’re, there |
| B. | They’re, their, there |
| C. | There, their, they’re |
| D. | They’re, there, there |
| Answer» C. There, their, they’re | |
| 47. |
All professors are researchers Some scientists are professors Which of the given conclusions is logically valid and is inferred from the above arguments: |
| A. | All scientists are researchers |
| B. | All professors are scientists |
| C. | Some researchers are scientists |
| D. | No conclusion follows |
| Answer» D. No conclusion follows | |
| 48. |
In a factory, two machines M1 and M2 manufacture 60% and 40% of the autocomponents respectively. Out of the total production, 2% of M1 and 3% of M2 are found to be defective. If a randomly drawn autocomponent from the combined lot is found defective, what is the probability that it was manufactured by M2? |
| A. | 0.35 |
| B. | 0.45 |
| C. | 0.5 |
| D. | 0.4 |
| Answer» D. 0.4 | |
| 49. |
Velocity of an object fired directly in upward direction is given by V = 80 - 32 t, where t (time) is in seconds. When will the velocity be between 32 m/sec and 64 m/sec? |
| A. | (1, 3/2) |
| B. | (1/2, 1) |
| C. | (1/2, 3/2) |
| D. | (1, 3) |
| Answer» D. (1, 3) | |
| 50. |
Select the pair that best expresses a relationship similar to that expressed in the pair: water: pipe:: |
| A. | cart: road |
| B. | electricity: wire |
| C. | sea: beach |
| D. | music: instrument |
| Answer» C. sea: beach | |