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. |
If Reynolds number is greater than 1, then the_____________________? |
| A. | Viscous force is larger than the inertia force |
| B. | Inertia force is larger than the viscous force |
| C. | Inertia force is larger than the surface tension force |
| D. | Inertia force is larger than the gravitational force |
| Answer» C. Inertia force is larger than the surface tension force | |
| 2. |
If a solid is compressed adiabatically in its elastic range, its _____________ remains constant ? |
| A. | Internal energy |
| B. | Enthalpy |
| C. | Entropy |
| D. | Temperature |
| Answer» D. Temperature | |
| 3. |
If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a _____________ reactor? |
| A. | Critical |
| B. | Breeder |
| C. | Fertile |
| D. | Heterogeneous |
| Answer» C. Fertile | |
| 4. |
Identify the false statement? |
| A. | Martensitic steels are less susceptible to pitting corrosion than austenitic steels |
| B. | Pitting corrosion is usually very localised |
| C. | Hydrogen embrittlement is facilitated by tensile stress |
| D. | Stress corrosion cracking is facilitated by tensile stress |
| Answer» B. Pitting corrosion is usually very localised | |
| 5. |
Identify the correct statement with reference to the extractive metallurgy of aluminium ? |
| A. | The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3 |
| B. | Approximately 80% of the aluminium deposited on the cathode comes from cryolite |
| C. | Sodium is deposited along with aluminium, but is immediately vaporised |
| D. | Anode effect sets in when the cryolite concentration goes below 40%. |
| Answer» B. Approximately 80% of the aluminium deposited on the cathode comes from cryolite | |
| 6. |
‘Ice point’ is designated on Fahrenheit temperature scale by__________________? |
| A. | 0° |
| B. | 32° |
| C. | 62° |
| D. | 212° |
| Answer» C. 62° | |
| 7. |
Hydrogen in liquid steels is dissolved_________________? |
| A. | As tiny gas bubbles |
| B. | In the atomic form |
| C. | In the ionic form |
| D. | In the molecular form |
| Answer» B. In the atomic form | |
| 8. |
Hydrogen can be ________________? |
| A. | Used in I.C. engines as fuel |
| B. | Liquefied & stored under cryogenic conditions |
| C. | Produced by electrolysis of water |
| D. | All (A), B. & C. |
| Answer» E. | |
| 9. |
Hydro-cyclone is a____________________? |
| A. | Crusher |
| B. | wet classifier |
| C. | Dry classifier |
| D. | Magnetic separator |
| Answer» C. Dry classifier | |
| 10. |
Hot working of lead is carried out at ___________________? |
| A. | 75°C |
| B. | 373°K |
| C. | 150°C |
| D. | Room temperature |
| Answer» C. 150°C | |
| 11. |
Hot extrusion of aluminium is done in the temperature range of ________________ °C ? |
| A. | 550-600 |
| B. | 450-500 |
| C. | 350-400 |
| D. | 250-300 |
| Answer» D. 250-300 | |
| 12. |
Hot & cold working of material causes its _______________ deformation? |
| A. | Visco-elastic |
| B. | Isotropic |
| C. | Elastic |
| D. | Plastic |
| Answer» E. | |
| 13. |
Hooke’s law_______________________? |
| A. | Applies to elastic deformation |
| B. | Applies beyond limit of proportionality in stress-strain curve |
| C. | States that stress is inversely proportional to strain upto elastic limit |
| D. | None of these |
| Answer» B. Applies beyond limit of proportionality in stress-strain curve | |
| 14. |
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 | |
| 15. |
Holes for riveting purposes should be preferably made by________________? |
| A. | Cutting torch |
| B. | Drilling |
| C. | Punching |
| D. | None of these |
| Answer» C. Punching | |
| 16. |
Highest cutting speed is achieved by the _______________ tool material ? |
| A. | High speed steel |
| B. | Carbide |
| C. | Cast alloy |
| D. | Plain carbon steel |
| Answer» C. Cast alloy | |
| 17. |
High speed steel tools retain their hardness upto a temperature of __________________ °C? |
| A. | 500 |
| B. | 750 |
| C. | 900 |
| D. | 1100 |
| Answer» D. 1100 | |
| 18. |
High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27°C with relative humidity ranging from _______________ percent ? |
| A. | 5 to 10 |
| B. | 15 to 25 |
| C. | 45 to 50 |
| D. | 75 to 80 |
| Answer» D. 75 to 80 | |
| 19. |
High endurance limit of carburised machine parts is because of the fact that carburisation __________________? |
| A. | Suppresses any stress concentration produced in the parts |
| B. | Enhances the yield point of the material |
| C. | Introduces a compressive layer on the surface |
| D. | Produces a better surface finish |
| Answer» D. Produces a better surface finish | |
| 20. |
Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called_______________________? |
| A. | Tempering |
| B. | Hardening |
| C. | Annealing |
| D. | Normalising |
| Answer» D. Normalising | |
| 21. |
Heating of ferromagnetic materials to a temperature above Curie temperature makes it ________________________? |
| A. | Insulator for heat & electricity transmission |
| B. | Ferritic |
| C. | Behave like paramagnetic materials |
| D. | Superconductor |
| Answer» D. Superconductor | |
| 22. |
Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by_________________? |
| A. | Conduction |
| B. | Convection |
| C. | Radiation |
| D. | Both A. & B. |
| Answer» D. Both A. & B. | |
| 23. |
Heat transfer by ______________ is almost absent in case of fluidised bed drying operation? |
| A. | Radiation |
| B. | Conduction |
| C. | Convection |
| D. | Both B. & C. |
| Answer» B. Conduction | |
| 24. |
Heat required to raise the temperature of a body by 1 °C is called its_______________? |
| A. | Heat capacity |
| B. | Specific heat capacity |
| C. | Thermal conductivity |
| D. | Water equivalent |
| Answer» B. Specific heat capacity | |
| 25. |
Heat release during phase change is observed in case of a/an_________________? |
| A. | Boiler |
| B. | Condenser |
| C. | Evaporator |
| D. | All A. B. & C. |
| Answer» C. Evaporator | |
| 26. |
Heat flow across a hollow sphere of inner radius ‘r1’ and outer radius ‘r2’ is directly proportional to__________________? |
| A. | (r2 – r1)/r1. r2 |
| B. | r1. r2/(r2 – r1) |
| C. | (r2 + r1)/r1. r2 |
| D. | r1. r2/(r2 + r1) |
| Answer» C. (r2 + r1)/r1. r2 | |
| 27. |
_______________ has a negative co-efficient of linear expansion? |
| A. | Iron |
| B. | Copper |
| C. | Rubber |
| D. | Nickel |
| Answer» C. Rubber | |
| 28. |
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 | |
| 29. |
Half life of a radioactive isotope corresponds to the time required for half of the _______________ to decay ? |
| A. | Atoms |
| B. | Neutrons |
| C. | Nucleons |
| D. | Electrons |
| Answer» B. Neutrons | |
| 30. |
Gross national product (GNP) means the total value of _______________ in a country ? |
| A. | Goods produced |
| B. | Gold reserve |
| C. | Earning of the citizens |
| D. | Taxes paid |
| Answer» B. Gold reserve | |
| 31. |
Good design of the casing of a centrifugal pump aims at minimising the __________________________? |
| A. | Cavitation |
| B. | Frictional losses |
| C. | Kinetic energy loss |
| D. | Static head |
| Answer» D. Static head | |
| 32. |
Glycerine 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. | Comparatively less weight of coolant is required |
| C. | Smaller radiator can be used |
| D. | All a, b & c |
| Answer» E. | |
| 33. |
Globular form of cementite is formed during the _________________ process ? |
| A. | Spheroidising |
| B. | Hardening |
| C. | Annealing |
| D. | Normalising |
| Answer» C. Annealing | |
| 34. |
Glass reacts with___________________? |
| A. | H2SO3 |
| B. | HF |
| C. | HNO3 |
| D. | K2Cr2O7 |
| Answer» C. HNO3 | |
| 35. |
_____________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C ? |
| A. | Borosilicate |
| B. | High silica |
| C. | Supermax |
| D. | Lead |
| Answer» D. Lead | |
| 36. |
‘GASOHOL’ widely used in Brazil as a motor fuel is a mixture of alcohol and____________________? |
| A. | Petrol |
| B. | LPG |
| C. | Light hydrocarbon gases (e.g. butane or propane) |
| D. | None of these |
| Answer» B. LPG | |
| 37. |
Gas turbine normally employs a constant _______________ cycle? |
| A. | Pressure |
| B. | Temperature |
| C. | Volume |
| D. | None of these |
| Answer» B. Temperature | |
| 38. |
Gantt charts are used for streamlining the__________________? |
| A. | Inventory control |
| B. | Production schedule |
| C. | Sales forecasting |
| D. | Quality control |
| Answer» C. Sales forecasting | |
| 39. |
Ganister contains maximum percentage of_________________? |
| A. | FeO |
| B. | SiO2 |
| C. | MgO |
| D. | MnO2 |
| Answer» C. MgO | |
| 40. |
Gage pressure within a spherical droplet of a fluid is ‘p’. What will be gage pressure within a bubble of the same size & of the same fluid ? |
| A. | p |
| B. | 2 p |
| C. | 0.5 p |
| D. | 0.25 p |
| Answer» C. 0.5 p | |
| 41. |
_________________ furnace is generally used in the non-ferrous foundries ? |
| A. | Direct arc |
| B. | Indirect arc |
| C. | Resistance |
| D. | Induction |
| Answer» C. Resistance | |
| 42. |
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 | |
| 43. |
Function of fusible plug in a boiler is to ______________________? |
| A. | Drain out water and sludge from the boiler during repair |
| B. | Put off fire in the furnace when water level in the boiler falls to unsafe limit |
| C. | Guard the boiler in case of abnormal rise in steam pressure |
| D. | All A, B. & C |
| Answer» C. Guard the boiler in case of abnormal rise in steam pressure | |
| 44. |
Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother ? |
| A. | Cresylic acid |
| B. | Xanthaies |
| C. | Pine oil |
| D. | All A, B. & C. |
| Answer» C. Pine oil | |
| 45. |
Friction factor for fluid flow in pipe does not depend upon the________________? |
| A. | Pipe length |
| B. | Pipe roughness |
| C. | Fluid density & viscosity |
| D. | Mass flow rate of fluid |
| Answer» B. Pipe roughness | |
| 46. |
Force between the molecules of the same substance is called ______________________ force? |
| A. | Adhesive |
| B. | Cohesive |
| C. | Molecular |
| D. | Vander Walls |
| Answer» C. Molecular | |
| 47. |
For the Stoke’s law to be valid in the case of a falling sphere in a fluid, the_____________________? |
| A. | Reynolds number (based on sphere diameter) should be < 1 |
| B. | Flow around the sphere should be in turbulent region |
| C. | Sphere must be metallic |
| D. | Fluid density should be constant |
| Answer» D. Fluid density should be constant | |
| 48. |
For the irreversible reaction, Ca+ 2C = Ca C2 , Δ H°298 = – 60000 J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be__________________? |
| A. | 30,000 J |
| B. | 60,000 J |
| C. | 90,000 J |
| D. | 2,40,000 J |
| Answer» D. 2,40,000 J | |
| 49. |
For separating small pieces of metal from engine oil of a car, the best separating technique is the _____________________ ? |
| A. | Chromatography |
| B. | Evaporation |
| C. | Filtration |
| D. | Fractional distillation |
| Answer» D. Fractional distillation | |
| 50. |
For preparation of porous bearings by powder metallurgy, preferred particle shape is___________________? |
| A. | Spherical |
| B. | Nodular |
| C. | Irregular |
| D. | No preferred shape |
| Answer» B. Nodular | |