MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot ? |
| A. | Temperature - entropy. |
| B. | Temperature - pressure. |
| C. | Enthalpy - entropy. |
| D. | Enthalpy-pressure. |
| Answer» B. Temperature - pressure. | |
| 2. |
Dielectric |
| A. | is an electrical insulating material. |
| B. | of low resistivity is preferred. |
| C. | should have high thermal conductivity. |
| D. | need not defy the corrosive action of chemicals. |
| Answer» B. of low resistivity is preferred. | |
| 3. |
Normalising of an object does not |
| A. | refine coarse grain structure obtained during hot working. |
| B. | improve ductility. |
| C. | improve yield strength. |
| D. | improve machanical properties. |
| Answer» C. improve yield strength. | |
| 4. |
Plasma is |
| A. | a high temperature neutral gas. |
| B. | nothing but ionised gas. |
| C. | a source of steady and highest controllable pressure. |
| D. | formed at very low temperature. |
| Answer» C. a source of steady and highest controllable pressure. | |
| 5. |
Iron content in Indian iron ore is about __________ percent. |
| A. | 80-85 |
| B. | 60-65 |
| C. | 40-45 |
| D. | 20-25 |
| Answer» C. 40-45 | |
| 6. |
The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is |
| A. | full annealing |
| B. | bright annealing |
| C. | patenting |
| D. | none of these |
| Answer» D. none of these | |
| 7. |
__________ of hard alloy and tool steel is done to make it easily machinable. |
| A. | Case carburising |
| B. | Tempering |
| C. | Normalising |
| D. | Annealing |
| Answer» C. Normalising | |
| 8. |
Which of the following mainly decides the current to be employed is arc welding ? |
| A. | Electrode size |
| B. | Plate thickness |
| C. | Voltage across the arc |
| D. | Welded portion length |
| Answer» B. Plate thickness | |
| 9. |
The trace metal present in insulin is |
| A. | Cu |
| B. | Zn |
| C. | Fe |
| D. | Ni |
| Answer» C. Fe | |
| 10. |
Cold cracking in the heat affected zone of a high strength steel weld can take place because of the |
| A. | retained austenite. |
| B. | martensite formation. |
| C. | relatively high sulphur content in the base metal. |
| D. | sufficient hydrogen present in the welding arc. |
| Answer» C. relatively high sulphur content in the base metal. | |
| 11. |
Drossing is a __________ operation. |
| A. | smelting |
| B. | dressing |
| C. | roasting |
| D. | dressing |
| Answer» D. dressing | |
| 12. |
Most of the phosphorous present in the blast furnace burden enters into |
| A. | hot metal |
| B. | flue gases |
| C. | slag |
| D. | refractory lining |
| Answer» B. flue gases | |
| 13. |
Photographic plates are coated with |
| A. | silver nitrate |
| B. | silver halide |
| C. | calcium silicate |
| D. | metallic silver |
| Answer» C. calcium silicate | |
| 14. |
Hardening of steel is not possible, unless it is heated __________ critical point. |
| A. | above the highest |
| B. | above the lowest |
| C. | between the first & second |
| D. | between the second & third |
| Answer» C. between the first & second | |
| 15. |
Lead pencil contains |
| A. | graphite |
| B. | lead sulphide |
| C. | lead |
| D. | both(b) & (c) |
| Answer» B. lead sulphide | |
| 16. |
Function of gear box is to |
| A. | reduce the speed. |
| B. | obtain variable speed. |
| C. | increase the speed. |
| D. | produce high torque. |
| Answer» C. increase the speed. | |
| 17. |
Pearlite comprises of |
| A. | 87% cementite & 13% Fe. |
| B. | 87% ferrite & 13% cementite. |
| C. | 93.33% ferrite & 6.67% C. |
| D. | 87% ferrite & 13% C. |
| Answer» C. 93.33% ferrite & 6.67% C. | |
| 18. |
Which of the following if present in iron ore, enhances its value ? |
| A. | Alumina |
| B. | Alkali oxide |
| C. | Lime & Magnesia |
| D. | None of these |
| Answer» D. None of these | |
| 19. |
The temperature range for which copper resistance thermometer can be used is __________ C |
| A. | 0 to 150 |
| B. | -200 to 150 |
| C. | 350 to 750 |
| D. | 500 to 900 |
| Answer» C. 350 to 750 | |
| 20. |
Paramagnetism method is not used for the composition determination of __________ in gases. |
| A. | oxygen |
| B. | oxides of nitrogen |
| C. | carbon dioxide |
| D. | any of these |
| Answer» D. any of these | |
| 21. |
An amplitude ratio of 0.1 corresponds to __________ decibels. |
| A. | 20 |
| B. | -20 |
| C. | 10 |
| D. | -10 |
| Answer» C. 10 | |
| 22. |
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a |
| A. | large area but small mass. |
| B. | high thermal conductivity. |
| C. | small specific heat. |
| D. | all'a', 'b' & 'c'. |
| Answer» E. | |
| 23. |
Pressure of 0.0001 absolute psi can be measured by __________ gauge. |
| A. | Mcloid |
| B. | Pirani |
| C. | thermocouple |
| D. | none of these |
| Answer» B. Pirani | |
| 24. |
As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise. |
| A. | 110 |
| B. | 85 |
| C. | 60 |
| D. | 45 |
| Answer» C. 60 | |
| 25. |
Dislocation cross-slip is difficult in those materials, which have |
| A. | large number of slip systems. |
| B. | high work hardening rate. |
| C. | coarse grain size. |
| D. | low stacking fault energy. |
| Answer» E. | |
| 26. |
Shrinkage allowance on pattern is provided to compensate for shrinkage when the |
| A. | metal changes from liquid state to solid state at freezing temperature. |
| B. | solid phase temperature drops from freezing temperature to the room temperature. |
| C. | liquid metal temperature drops from pouring temperature to room temperature. |
| D. | liquid metal temperature drops from pouring temperature to freezing temperature. |
| Answer» C. liquid metal temperature drops from pouring temperature to room temperature. | |
| 27. |
Spark plug is provided in a/an |
| A. | engine having carburettor. |
| B. | diesel engine. |
| C. | compression ignition engine. |
| D. | both(b) & (c). |
| Answer» B. diesel engine. | |
| 28. |
With increase in temperature, the electrical conductivity of a __________ decreases. |
| A. | semi-conductor |
| B. | metal or alloy |
| C. | dielectric |
| D. | none of these |
| Answer» B. metal or alloy | |
| 29. |
All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent. |
| A. | deuterium |
| B. | hydrogen |
| C. | neon |
| D. | helium |
| Answer» C. neon | |
| 30. |
Which of the following gases cause global warming ? |
| A. | Carbon monoxide |
| B. | Carbon dioxide |
| C. | Nitrogen |
| D. | Ozone |
| Answer» C. Nitrogen | |
| 31. |
Multistage compression of air as compared to single stage compression offers the advantage of |
| A. | power saving per unit weight of air delivered. |
| B. | moisture elimination in the inter-stage cooler. |
| C. | increased volumetric efficiency. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 32. |
Fine grained steels have |
| A. | high brittleness |
| B. | higher tendency to distort |
| C. | high ductility |
| D. | none of these |
| Answer» D. none of these | |
| 33. |
Isotropic materials have the same __________ in all directions. |
| A. | induced stresses |
| B. | density |
| C. | elastic properties |
| D. | thermal properties |
| Answer» D. thermal properties | |
| 34. |
The most important requirement for aluminium industry is the availability of cheap |
| A. | ore |
| B. | electrical power |
| C. | labour |
| D. | & abundant water |
| Answer» C. labour | |
| 35. |
Spheriodising of a material is a/an __________ process. |
| A. | normalising |
| B. | annealing |
| C. | tempering |
| D. | hardening |
| Answer» C. tempering | |
| 36. |
Potable water means the water used for |
| A. | fire-fighting |
| B. | cooling |
| C. | drinking |
| D. | evaporation to produce steam |
| Answer» D. evaporation to produce steam | |
| 37. |
One ton of refrigeration is not equivalent to the heat removal rate of |
| A. | 200 BTU/minute |
| B. | 50 kcal/minute |
| C. | 50 kJ/sec. |
| D. | 3.5 KW |
| Answer» D. 3.5 KW | |
| 38. |
Starting friction is low in case of the __________ lubrication. |
| A. | boundary |
| B. | hydrodynamic |
| C. | hydrostatic |
| D. | mixed/semi-fluid |
| Answer» D. mixed/semi-fluid | |
| 39. |
Ultimate strength in tension as compared to that in shear for steel is |
| A. | half |
| B. | one third |
| C. | one and half times |
| D. | one fourth |
| Answer» D. one fourth | |
| 40. |
Which of the following heat treatment processes is usually applied to castings ? |
| A. | Tempering |
| B. | Annealing |
| C. | Normalising |
| D. | Carburising |
| Answer» E. | |
| 41. |
Non-ferrous alloys used for making cutting tools need not have high |
| A. | abrasion resistance |
| B. | toughness |
| C. | red hardness |
| D. | cutting speed |
| Answer» C. red hardness | |
| 42. |
Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses. |
| A. | forging |
| B. | cold rolling |
| C. | hot rolling |
| D. | casting |
| Answer» C. hot rolling | |
| 43. |
Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be |
| A. | more |
| B. | less |
| C. | same |
| D. | either more or less; depends on the climatic conditions. |
| Answer» C. same | |
| 44. |
Glycerene is used as a coolant in cooling of some engines instead of water, because |
| A. | its higher boiling point (290 C) increases its heat carrying capacity. |
| B. | compartively less weight of coolant is required. |
| C. | smaller radiator can be used. |
| D. | all a, b & c. |
| Answer» E. | |
| 45. |
Cold working of a material results in increase in hardness, which is termed as the __________ hardening. |
| A. | cold |
| B. | work |
| C. | age |
| D. | induction |
| Answer» C. age | |
| 46. |
Temperature attained in soldering of metals is about __________ C. |
| A. | 150-300 |
| B. | 400-500 |
| C. | 650-800 |
| D. | 1000-1100 |
| Answer» B. 400-500 | |
| 47. |
The machanism involved in the removal of metal in drilling operation is by |
| A. | compression |
| B. | extrusion |
| C. | shearing |
| D. | both 'b' & 'c' |
| Answer» E. | |
| 48. |
Thermal conductivity of a material does not depend upon its |
| A. | mass |
| B. | volume |
| C. | surface area |
| D. | all 'a', 'b' & 'c' |
| Answer» E. | |
| 49. |
The normal stress is the same in all directions at a point in a fluid, only when the fluid |
| A. | is at rest & has zero viscosity. |
| B. | is frictionless. |
| C. | fluid layer has no motion relative to an adjacent layer of fluid. |
| D. | is incompressible & frictionless. |
| Answer» E. | |
| 50. |
A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/sec2 is |
| A. | 8.82 |
| B. | 9.81 |
| C. | 10.88 |
| D. | 0.95 |
| Answer» B. 9.81 | |