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. |
The noble metals |
| A. | are exemplified by Na, K and Li. |
| B. | do not resist corrosion very strongly. |
| C. | are the lowermost in the electro-chemical series of metals. |
| D. | none of these. |
| Answer» D. none of these. | |
| 2. |
Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C is |
| A. | 3 |
| B. | 5 |
| C. | 0.5 |
| D. | 1.5 |
| Answer» C. 0.5 | |
| 3. |
Boiler tube size is specified by its thickness and __________ diameter. |
| A. | outside |
| B. | inside |
| C. | mean |
| D. | none of these |
| Answer» B. inside | |
| 4. |
A thermally thin body is the one for which |
| A. | Biot number is less than 0.1. |
| B. | Gallileo number is less than 0.1. |
| C. | Fourier number is less than 0.1. |
| D. | Fourier number is greater than 0.1. |
| Answer» B. Gallileo number is less than 0.1. | |
| 5. |
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the |
| A. | range is 15°F. |
| B. | approach is 10°F. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 6. |
Kinematic viscosity of water as compared to that of air is |
| A. | more |
| B. | same |
| C. | 15% more |
| D. | 15% less |
| Answer» E. | |
| 7. |
Grain hardness is measured by the __________ hardness testing method. |
| A. | Knoop |
| B. | Rockwell F |
| C. | Shore sceleroscope |
| D. | Vicker's |
| Answer» B. Rockwell F | |
| 8. |
Viscoelastic behaviour is observed in __________ materials. |
| A. | non-crystalline organic polymeric |
| B. | ceramic |
| C. | all crystalline |
| D. | all amorphous |
| Answer» B. ceramic | |
| 9. |
Difference at any instant between the value of the controlled variable and the set point is called the |
| A. | deviation |
| B. | derivative time |
| C. | error ratio |
| D. | differential gap |
| Answer» B. derivative time | |
| 10. |
Which of the following alloying elements when added in steel does not improve its lachinability ? |
| A. | Sulphur |
| B. | Phosphorous |
| C. | Copper |
| D. | Lead |
| Answer» D. Lead | |
| 11. |
Maximum change in the hardness of mar tensite occurs in the carbon content range of __________ percent in steel. |
| A. | 0.01 to 0.10 |
| B. | 0.2 to 0.4 |
| C. | 0.5 to 0.7 |
| D. | 0.8 to 1.0 |
| Answer» C. 0.5 to 0.7 | |
| 12. |
Milk is fat dispersed in water. It is an example of |
| A. | suspension |
| B. | emulsion |
| C. | gel |
| D. | solution |
| Answer» C. gel | |
| 13. |
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 | |
| 14. |
For dynamic strain measurement, the wheatstone bridge used is of __________ type. |
| A. | voltage sensitive null |
| B. | voltage sensitive deflected |
| C. | current sensitive deflected |
| D. | none of these |
| Answer» C. current sensitive deflected | |
| 15. |
To counteract the bad effects of strain hardening on a cold formed part, it must be |
| A. | tempered |
| B. | normalised |
| C. | annealed |
| D. | hardened |
| Answer» D. hardened | |
| 16. |
The fatigue resistance of a material is improved by the following technique. |
| A. | Anodising |
| B. | Carburising |
| C. | Ion nitriding |
| D. | Shot peening |
| Answer» E. | |
| 17. |
An atom bomb works on the principle of |
| A. | nuclear fission |
| B. | nuclear fusion |
| C. | both the nuclear fission & fusion |
| D. | ionisation |
| Answer» B. nuclear fusion | |
| 18. |
L.D. (Linz-Donawitz) converter is used in the production of |
| A. | copper |
| B. | steel |
| C. | zinc |
| D. | aluminium |
| Answer» C. zinc | |
| 19. |
The forms in which various metals and non metals occur in nature are called minerals. Which of the following is not a metallic ferrous mineral? |
| A. | Cassiterite |
| B. | Sphalerite |
| C. | Chalcopyrite |
| D. | Calcite |
| Answer» E. | |
| 20. |
In which of the following reactions, application of vacuum will help ? |
| A. | Number of gas molecules in the product side is more than that on the reactant side. |
| B. | Number of gas molecules in the reactant side is more than that on the product side. |
| C. | Number of gas molecules are the same on both the reactant & the product side. |
| D. | None of the above. |
| Answer» E. | |
| 21. |
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. | |
| 22. |
Cold chiesel & hammers are made of |
| A. | high speed steel |
| B. | high carbon steel |
| C. | forged steel |
| D. | mild steel |
| Answer» C. forged steel | |
| 23. |
The thermodynamic law, PVy = constant, is not followed by the |
| A. | free expansion of an ideal gas. |
| B. | adiabatic expansion of steam in turbine. |
| C. | adiabatic compression of air. |
| D. | ideal compression of air. |
| Answer» B. adiabatic expansion of steam in turbine. | |
| 24. |
The tensile strength of plastics ranges from __________ kg/mm2. |
| A. | 10 to 50 |
| B. | 50 to 100 |
| C. | 0.01 to 0.1 |
| D. | 0.1 to 10 |
| Answer» E. | |
| 25. |
The magnitude of water hammer caused in pipe flow is independent of the |
| A. | pipe length. |
| B. | fluid flow stoppage rate. |
| C. | fluid temperature. |
| D. | time of valve closure. |
| Answer» D. time of valve closure. | |
| 26. |
Stoneware pipes used for sewers for carrying sewage normally is joined by __________ joint. |
| A. | spigot and socket |
| B. | flanged iron |
| C. | collar |
| D. | expansion |
| Answer» B. flanged iron | |
| 27. |
Joining of thin foils is preferred to be done by |
| A. | gamma rays |
| B. | X-rays |
| C. | microwaves |
| D. | gas welding |
| Answer» D. gas welding | |
| 28. |
The most commonly used combustion system manufactured in India for the thermal power plant boilers is the __________ combustion system. |
| A. | pulverised fuel |
| B. | travelling grate stoker firing |
| C. | circulating fluidised bed |
| D. | fluidised bed |
| Answer» B. travelling grate stoker firing | |
| 29. |
Enzymes belong to the category of |
| A. | proteins |
| B. | carbohydrates |
| C. | vitamins |
| D. | fats |
| Answer» B. carbohydrates | |
| 30. |
For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys. |
| A. | 250 |
| B. | 500 |
| C. | 1000 |
| D. | 3000 |
| Answer» C. 1000 | |
| 31. |
The thermal efficiency of a heat engine giving an output of 4 KW with an input of 10000 Joules/sec is __________ percent. |
| A. | 40 |
| B. | 80 |
| C. | 10 |
| D. | 25 |
| Answer» B. 80 | |
| 32. |
A boy weighing 110lb climbs up a 50 ft high vertical destination in 100 seconds. Horse power of the boy is __________ hp. |
| A. | 0.1 |
| B. | 0.5 |
| C. | 0.8 |
| D. | 1 |
| Answer» B. 0.5 | |
| 33. |
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. | 30000 J |
| B. | 60000 J |
| C. | 90000 J |
| D. | 240000 J |
| Answer» D. 240000 J | |
| 34. |
The type of water filter normally employed/ preferred for treating small quantities of water in railway stations and individual industries is the __________ filter. |
| A. | rapid sand |
| B. | pressure |
| C. | gravity |
| D. | slow sand. |
| Answer» C. gravity | |
| 35. |
The most detrimental impurity in high pressure boiler feed water is |
| A. | suspended salt |
| B. | dissolved salt |
| C. | silica |
| D. | turbidity |
| Answer» D. turbidity | |
| 36. |
On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the __________ of the input signal. |
| A. | frequency |
| B. | amplitude |
| C. | damping |
| D. | none of these |
| Answer» B. amplitude | |
| 37. |
Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress. |
| A. | working |
| B. | bearing |
| C. | yield |
| D. | none of these |
| Answer» B. bearing | |
| 38. |
The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is |
| A. | more |
| B. | equal |
| C. | less |
| D. | double |
| Answer» B. equal | |
| 39. |
In the blast furnace, incorporation of water vapour in the blast gives the following effect. |
| A. | Increases the reducing potential of the gas. |
| B. | Increases the flame temperature. |
| C. | No significant change occurs. |
| D. | Increases the hydrogen content in the metal. |
| Answer» B. Increases the flame temperature. | |
| 40. |
In a furnace with heating element temperature at 1700°C, the dominant machanism of heat transfer will be |
| A. | conduction |
| B. | radiation |
| C. | natural convection |
| D. | forced convection |
| Answer» C. natural convection | |
| 41. |
Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature. |
| A. | copper |
| B. | steel |
| C. | aluminium |
| D. | brass |
| Answer» B. steel | |
| 42. |
The swift cup test evaluates the following property of a sheet metal. |
| A. | Stretchability |
| B. | Drawability |
| C. | Bendability |
| D. | None of these |
| Answer» C. Bendability | |
| 43. |
Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas) |
| A. | T |
| B. | 1/p |
| C. | y |
| D. | 1/ρ |
| Answer» C. y | |
| 44. |
Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog? |
| A. | Nitrogen oxides |
| B. | Hydrocarbons |
| C. | both 'a' & 'b' |
| D. | Carbon monoxide |
| Answer» D. Carbon monoxide | |
| 45. |
Oxide layer formed on the non-ferrous metal surface after its annealing is |
| A. | removed by acid pickling. |
| B. | hammered into the surface. |
| C. | removed with coarse emery cloth. |
| D. | left as such to protect the surface. |
| Answer» B. hammered into the surface. | |
| 46. |
Electrometallurgical methods of metal extraction is normally used for those metals |
| A. | whose oxide/ore is not reduced by carbon. |
| B. | which fall in the category of alkali & alkaline earth metals. |
| C. | which stands higher in the electrochemical series of the metal. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 47. |
Gas turbine normally employs a constant __________ cycle. |
| A. | pressure |
| B. | temperature |
| C. | volume |
| D. | none of these |
| Answer» B. temperature | |
| 48. |
Machine tool bodies are usually made of |
| A. | cast iron |
| B. | mild steel |
| C. | wrought iron |
| D. | copper alloys |
| Answer» B. mild steel | |
| 49. |
__________ wire is never used for making the heating element. |
| A. | Nichrome |
| B. | Kanthal |
| C. | Invar |
| D. | None of these |
| Answer» D. None of these | |
| 50. |
Which of the following is not found in iron-carbon equilibrium diagram ? |
| A. | Curie point |
| B. | Peritectic point |
| C. | Eutectic point |
| D. | Eutectoid point |
| Answer» B. Peritectic point | |