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. |
Which of the following pairs regarding the effect of alloying elements in steels are not matched correctly?? |
| A. | Cobalt: It contributes to rerl hardness by hardening ferrite |
| B. | Molybdenum: It forms abrasion resisting particles |
| C. | Phosphorous: It improves machinability in free cutting steels |
| D. | Silicon: It reduces oxidation resistance |
| Answer» B. Molybdenum: It forms abrasion resisting particles | |
| 2. |
Which of the following is not the commercial name of polymethyl-methacrylate (PMMA)?? |
| A. | Styrofoam |
| B. | Lucite |
| C. | Perspex |
| D. | Plexiglass |
| Answer» B. Lucite | |
| 3. |
Cascade control is? |
| A. | The continuous adjustment of the set point index of an automatic control loop by a primary (master) controller |
| B. | Used when changes in process conditions cause serious upsets in the controlled variable |
| C. | Useful to control flow from temperature |
| D. | All of the above |
| Answer» E. | |
| 4. |
Corrosion is? |
| A. | A physical phenomenon |
| B. | A chemical phenomenon |
| C. | Same as erosion |
| D. | An uncontrollable phenomenon |
| Answer» C. Same as erosion | |
| 5. |
With increase in temperature, the electrical conductivity of semiconductors? |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | Either A or B, depends on the type of semi-conductor |
| Answer» B. Decreases | |
| 6. |
Which of the following manufacturing processes produces the strongest components ?? |
| A. | Forging |
| B. | Cold rolling |
| C. | Hot rolling |
| D. | Die casting |
| Answer» B. Cold rolling | |
| 7. |
Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)? |
| A. | A |
| B. | L |
| C. | A² |
| D. | Both A & B |
| Answer» E. | |
| 8. |
The trace metal present in insulin is? |
| A. | Cu |
| B. | Zn |
| C. | Fe |
| D. | Ni |
| Answer» C. Fe | |
| 9. |
Colloids can be purified by? |
| A. | Dialysis |
| B. | Reverse osmosis |
| C. | Coagulation |
| D. | Peptization |
| Answer» B. Reverse osmosis | |
| 10. |
Tip of the match stick contains a mixture of? |
| A. | K + S |
| B. | K + S + K‚ÇÇCr‚ÇÇO‚Çá |
| C. | S + K‚ÇÇCr‚ÇÇO‚Çá + White P |
| D. | None of these |
| Answer» D. None of these | |
| 11. |
In the acid Bessemer process, the hot metal should have the following com-positon.? |
| A. | S < 0.05% and P < 0.05% |
| B. | S < 0.05% and P < 1.5% |
| C. | S < 0.05% and P > 1.5% |
| D. | S > 1.5% and P < 0.05% |
| Answer» B. S < 0.05% and P < 1.5% | |
| 12. |
The hardenability of steel decreases with? |
| A. | Decrease in dislocation density |
| B. | Increase in solutionising temperature |
| C. | Increase in strength |
| D. | Decrease in grain size |
| Answer» E. | |
| 13. |
The expected efficiency of a single rivetted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.? |
| A. | Two |
| B. | Four |
| C. | Six |
| D. | Eight |
| Answer» B. Four | |
| 14. |
With increase in compression ratio, the volumetric efficiency of air compressor? |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | May increase or decrease (depends on the suction pressure) |
| Answer» B. Decreases | |
| 15. |
__________ welding will be the most suitable for butt welding two 20 cms thick boiler drum mild steel plates.? |
| A. | Electrical resistance |
| B. | Electroslag |
| C. | Plasma torch |
| D. | Submerged arc |
| Answer» C. Plasma torch | |
| 16. |
Dislocations are __________ defects.? |
| A. | Point |
| B. | Line |
| C. | Volume |
| D. | None of these |
| Answer» C. Volume | |
| 17. |
Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.? |
| A. | Grey |
| B. | Black |
| C. | Opaque |
| D. | White |
| Answer» B. Black | |
| 18. |
Thermoplastics are never moulded using? |
| A. | Injection moulding |
| B. | Blow moulding |
| C. | Extrusion |
| D. | Compression moulding |
| Answer» E. | |
| 19. |
__________ test is the appropriate test to determine whether a material is ductile or brittle.? |
| A. | Impact |
| B. | Cupping |
| C. | Hardness |
| D. | Tensile |
| Answer» B. Cupping | |
| 20. |
Cast iron has the unique property of high? |
| A. | Ductility |
| B. | Damping characteristics |
| C. | Hardness |
| D. | Malleability |
| Answer» C. Hardness | |
| 21. |
When the wavelength of incident X-rays increases, the angle of diffraction? |
| A. | Decreases |
| B. | Increases |
| C. | Remains constant |
| D. | Shows no systematic variation |
| Answer» B. Increases | |
| 22. |
Sulphur is melted in the sulphuric acid plant most commonly by employing? |
| A. | Electrical heater |
| B. | Steam heater |
| C. | Direct fuel oil fired heater |
| D. | Gas fired furnace |
| Answer» C. Direct fuel oil fired heater | |
| 23. |
Carburettor in a spark ignition engine is used to? |
| A. | Mix air-fuel in the desired ratio |
| B. | Maintain a constant speed at varying loads |
| C. | Adjust the stroke length |
| D. | Increase the compression ratio |
| Answer» B. Maintain a constant speed at varying loads | |
| 24. |
Monazite deposits constitute an important source for the following metal.? |
| A. | Thorium |
| B. | Titanium |
| C. | Molybdenum |
| D. | None of the above |
| Answer» B. Titanium | |
| 25. |
__________ is a non volatile film forming constituent of a paint.? |
| A. | Thinner |
| B. | Dryer |
| C. | Drying oil |
| D. | None of these |
| Answer» D. None of these | |
| 26. |
The single most imortant requirement for a turbine blade material is? |
| A. | Damping |
| B. | Resilience |
| C. | Creep resistaned |
| D. | DBTT |
| Answer» D. DBTT | |
| 27. |
Which of the following is an unconventional source of energy ?? |
| A. | Thermal power |
| B. | Hydroelectric power |
| C. | Nuclear-fusion power |
| D. | Solar power |
| Answer» E. | |
| 28. |
Enzymes belong to the category of? |
| A. | Proteins |
| B. | Carbohydrates |
| C. | Vitamins |
| D. | Fats |
| Answer» B. Carbohydrates | |
| 29. |
Lime contains about 90% CaO. Percentage CaO present in limestone is about? |
| A. | 25 |
| B. | 50 |
| C. | 70 |
| D. | 80 |
| Answer» C. 70 | |
| 30. |
Buoyancy force depends on the __________ the liquid.? |
| A. | Depth of immersion in |
| B. | Displaced mass of |
| C. | Surface tension of |
| D. | Viscosity of |
| Answer» C. Surface tension of | |
| 31. |
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 | |
| 32. |
Nitrogen is not an essential component of? |
| A. | Protein |
| B. | Urea |
| C. | Oils & fats |
| D. | Any of these |
| Answer» D. Any of these | |
| 33. |
Source of heat supply in a cupola is? |
| A. | Coke |
| B. | Charcoal |
| C. | Lumpy coal |
| D. | Pulverised coal |
| Answer» B. Charcoal | |
| 34. |
Stretcher strains found in a low carbon sheet are associated with the? |
| A. | Texture |
| B. | Dislocation density |
| C. | Yield point phenomenon |
| D. | Thickness of the sheet |
| Answer» D. Thickness of the sheet | |
| 35. |
High speed steel tools retain their hardness upto a temperature of __________ °C.? |
| A. | 500 |
| B. | 750 |
| C. | 900 |
| D. | 1100 |
| Answer» D. 1100 | |
| 36. |
Electrolytic reduction cell used for conversion of calcined Al2O₃ to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to? |
| A. | Achieve very high purity of aluminium (99.9%) |
| B. | Keep the electrolyte in liquid condition by the generation of heat |
| C. | Electrolytically dissociate alumina |
| D. | Both(b) & (c) |
| Answer» E. | |
| 37. |
Load cells used for the measurement of weight has? |
| A. | Compact & rugged construction with an accuracy of 0.1 to 1% |
| B. | No moving parts and incurs negligible deflection under load |
| C. | Provision of thermal compensation and is hermetically sealed |
| D. | All of the above |
| Answer» E. | |
| 38. |
Protection of ship hulls against sea water corrosion is done by coating with zinc because of the fact that zinc compared to iron is? |
| A. | Reduced preferentially |
| B. | Cheaper |
| C. | Oxidised preferentially |
| D. | Lighter |
| Answer» D. Lighter | |
| 39. |
'Flare tower' used in industry is meant for? |
| A. | Venting off (after burning) the excess inflammable/toxic gases at high pressure |
| B. | Absorbing the pollutant gases from the furnace exhaust |
| C. | Cooling of furnace exhaust gases |
| D. | None of these |
| Answer» B. Absorbing the pollutant gases from the furnace exhaust | |
| 40. |
__________ 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 | |
| 41. |
Dezincification is a form of corrosion, which specifically applies to? |
| A. | Steel |
| B. | Brass |
| C. | Stainless steel |
| D. | Babbit metal |
| Answer» C. Stainless steel | |
| 42. |
Minimum thermal efficiency of a steam boiler may be around __________ percent? |
| A. | 25 |
| B. | 45 |
| C. | 65 |
| D. | 20 |
| Answer» E. | |
| 43. |
Expansion device used in a window air-conditioner is a/an? |
| A. | Automatic expansion valve |
| B. | Thermostatic expansion valve |
| C. | Float valve |
| D. | Capillary tube |
| Answer» E. | |
| 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 of the above |
| Answer» C. Pine oil | |
| 45. |
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 | |
| 46. |
Change in volume of metals from absolute zero temperature to their melting points is? |
| A. | Almost same for all metals |
| B. | Different for different metals |
| C. | Less for low melting point metals |
| D. | Less for high melting point metals |
| Answer» B. Different for different metals | |
| 47. |
Pick out the correct combination about the role of various additives used in polymers.? |
| A. | Plasticiser : increases the polymer strength |
| B. | Heat stabiliser : increases the maximum service temperature |
| C. | Fillers: Does not affect the property of polymer but increases its weight |
| D. | Lubricants: increases the flexibility of polymers |
| Answer» D. Lubricants: increases the flexibility of polymers | |
| 48. |
"Internal energy of a gas obeying Vanderwall's equation of state, (p + a/v²)(V - b) = RT , depends upon its"? |
| A. | Pressure & temperature |
| B. | Pressure & specific volume |
| C. | Temperature & specific volume |
| D. | Temperature only |
| Answer» B. Pressure & specific volume | |
| 49. |
Role of a "collector" in froth floatation is to? |
| A. | Form a water repelling film on the mineral surface |
| B. | Create and stabilise the froth |
| C. | Act as a surface |
| D. | Collect the minerals according to their specific gravity |
| Answer» B. Create and stabilise the froth | |
| 50. |
The following type of bonding is strongly directional in solids.? |
| A. | Vander Waal's |
| B. | Ionic |
| C. | Metallic |
| D. | Covalant |
| Answer» E. | |