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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following metals is least used in making magnesium alloys?(a) Aluminium(b) Zinc(c) Copper(d) Manganese |
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Answer» Correct answer is (c) Copper To explain I would say: Magnesium metal in itself is not one of the strongest metals and is hence adulterated with other materials to form strong alloys. Among the following, aluminium, zinc and manganese are highly used in making magnesium alloys. |
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| 2. |
What is the Vicker’s hardness of steel before the HPF process?(a) 150 Hv(b) 160 Hv(c) 170 Hv(d) 180 Hv |
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Answer» Right option is (c) 170 Hv For explanation: The HPF process in steels is considered to be a very important process, it involves heating the steel to high temperatures. The Vickers hardness of steel before HPF process is 170 Hv. |
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| 3. |
What is the kind of lattice in a delta iron?(a) Face centered cubic(b) Body centered cubic(c) Hexagonal closely packed(d) Tetragonal closely packed |
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Answer» The correct choice is (b) Body centered cubic The best I can explain: The delta form of solid state of iron, which is formed on cooling the melt, has a body centered cubic lattice structure. |
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| 4. |
In the given figure of a side blown converter, what does the question mark represent?(a) Tuyeres(b) Liquid metal(c) Trunnion for tilting(d) Wind box |
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Answer» The correct answer is (c) Trunnion for tilting To explain: The question mark is representing a trunnion. This trunnion is used for tilting the entire apparatus, which is giving the required angle to the side blown converter. |
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| 5. |
What is the purpose of auxiliary tuyeres?(a) Raise solidification efficiency(b) Drop solidification efficiency(c) Raise melting efficiency(d) Drop melting efficiency |
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Answer» Correct answer is (c) Raise melting efficiency Explanation: Auxiliary tuyeres are basically used for providing to increase melting efficiency. They are fitted in one or more number of rows. |
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| 6. |
Which of the following can be the casting temperature for magnesium alloys?(a) 630°C(b) 760°C(c) 850°C(d) 970°C |
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Answer» Right option is (b) 760°C Explanation: When it comes to casting of magnesium alloys, the casting temperatures have to be kept in real control, that is, if the temperatures go too high, the metal might catch fire. The temperature range for casting magnesium alloys is 720°C to 800°C. |
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| 7. |
What should the temperature ideally be to remove the casting after making of magnesium alloys?(a) Below 450°C(b) Below 300°C(c) Below 350°C(d) Below 300°C |
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Answer» Correct option is (d) Below 300°C To explain I would say: It is always advisable that the castings should never be removed too quickly, as it might lead to distortion of the cast because it is still hot. Therefore, when the temperature of the cast is below 300°C, the magnesium alloy cast can be removed. |
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| 8. |
In sand casting of magnesium alloys, what is the amount of silica sand used in an American mix?(a) 80 lb(b) 90 lb(c) 100 lb(d) 110 lb |
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Answer» Right option is (c) 100 lb To elaborate: It is mainly observed that magnesium alloys are manufactured with the help of sand molds only. The amount of silica sand used in magnesium alloys is 100 lbs in both the British mix and the American mix. |
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| 9. |
What is the Vickers hardness of steel after the HPF process?(a) 362 Hv(b) 462 Hv(c) 562 Hv(d) 662 Hv |
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Answer» The correct answer is (b) 462 Hv Explanation: The HPF process is a very essential process. The Vickers hardness of the material is found to change after this process is done. The Vickers hardness of steel after HPF process is 462 Hv. |
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| 10. |
In magnesium alloys, what is the maximum amount of allowed aluminum?(a) 11%(b) 13%(c) 19%(d) 24% |
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Answer» The correct answer is (a) 11% Best explanation: Magnesium alloys are basically a composition of various metals mixed with magnesium to improve its physical, chemical, mechanical and thermal properties. In this, the maximum allowable aluminum that can be added is only 11%. |
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| 11. |
What is the maximum temperature allowed to be given to the injection molding process?(a) 300°C(b) 320°C(c) 350°C(d) 400°C |
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Answer» The correct answer is (a) 300°C For explanation: The maximum allowable temperature that can be given to the system is 300°C, in this particular method of molding. |
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| 12. |
From the following volumes, which capacity the Pilot-scale bioreactor holds?(a) 100-1000L(b) 1000-10000L(c) 1-100L(d) less than 1L |
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Answer» Right option is (a) 100-1000L For explanation I would say: The Pilot-scale bioreactor vessel of capacity 100-1000L is built according to specifications determined from the bench-scale prototype. |
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| 13. |
What is the maximum thickness that can be allowed for a plastics sheet in a vacuum forming process?(a) 3 mm(b) 3.1 mm(c) 3.2 mm(d) 3.3 mm |
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Answer» Right choice is (c) 3.2 mm The best explanation: Vacuum forming process is one of the important processes that are employed in thermoforming processes. The maximum thickness of the plastic sheet has to be noted, as a clamp is to be fitted around the plastic sheet. The maximum allowable thickness of this plastic sheet is 3.2mm. |
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| 14. |
Where is the cupola situated above tuyeres for superheating, combustion or oxidizing zone?(a) 15cm to 30cm(b) 25cm to 40cm(c) 35cm to 50cm(d) 45cm to 60cm |
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Answer» Right answer is (a) 15cm to 30cm Easiest explanation: For superheating, combustion or oxidizing zone, the cupola is generally situated at the top, approximately 15cm to 30cm above the tuyeres. |
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| 15. |
Oxy-acetylene process is most suited for which of the following process of joining?(a) Metal wires(b) Metal sheets(c) Metal tubes(d) Metal bars |
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Answer» Right answer is (b) Metal sheets The best explanation: Oxy-acetylene process is most suited for the joining of metal sheets or for joining metal plates which are having a thickness of 2mm to 50mm. While joining, the molten metal flows together to form a continuous joint. |
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| 16. |
What amount of impurity is allowed for copper to be used in electric applications?(a) 0.1%(b) 0.2%(c) 0.3%(d) 0.4% |
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Answer» Correct option is (a) 0.1% Easiest explanation: Copper and its alloys find themselves a variety of applications in the field of electrical and micro electrical works. For copper to be able to get used in electric appliances, the maximum impurity that can be allowed is 0.1%. |
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| 17. |
What is the amount of nitrogen used in HPF steel?(a) Less than 0.03%(b) Less than 0.02%(c) Less than 0.04%(d) Less than 0.05% |
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Answer» The correct option is (b) Less than 0.02% The best I can explain: The nitrogen content which is used in HPF steel is very less in percentage composition. The amount of nitrogen used in terms of percentage weight is less than 0.02%. |
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| 18. |
What is the amount of boron used in HPF steel?(a) Less than 0.003%(b) Less than 0.007%(c) Less than 0.009%(d) Less than 0.057% |
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Answer» Right choice is (a) Less than 0.003% Easy explanation: The boron content which is used in HPF steel is extremely less in percentage composition. The amount of boron used in terms of percentage weight is less than 0.003%. |
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| 19. |
HPF steel is normalized at what temperature?(a) 800°C(b) 900°C(c) 1000°C(d) 1100°C |
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Answer» Correct option is (b) 900°C Explanation: The HPF steel has to be taken to high magnitudes of temperatures. The HPF steel or the hot press forming steel gets normalized at 900°C. |
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| 20. |
What is the amount of silicon used in HPF steel?(a) Less than 0.30%(b) Less than 0.20%(c) Less than 0.40%(d) Less than 0.50% |
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Answer» Correct answer is (d) Less than 0.50% Easiest explanation: The silicon content which is used in HPF steel is very less in percentage composition. The amount of silicon used in terms of percentage weight is less than 0.50%. |
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| 21. |
Which material is not used as an iron coating on the electrode used in arc welding?(a) Cellulose(b) Iron powder(c) Calcium fluoride(d) Steel |
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Answer» Correct answer is (d) Steel Explanation: Materials that are used as coating on the electrode, that are used in arc welding, are cellulose, iron powder, calcium fluoride and rutile. Iron is used for ease of weld, but not steel, though it mainly contains iron. |
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| 22. |
What is the amount of tungsten used in HPF steel?(a) Less than 0.03%(b) Less than 0.02%(c) Less than 0.04%(d) Less than 0.05% |
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Answer» Correct option is (d) Less than 0.05% The best I can explain: The tungsten content which is used in HPF steel is very less in terms of percentage composition. The amount of tungsten used in terms of percentage weight is less than 0.05%. |
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| 23. |
Which colour is obtained by copper alloys, when zinc is added to it?(a) Red(b) Blue(c) Silver(d) Yellow |
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Answer» Right option is (d) Yellow The explanation: It is one of the most unusual properties of copper alloys, that on addition of different materials in them, there is a change observed in its appearance, that is, the colour of the mixture starts changing. On addition of zinc metal in copper, the colour of the mixture changes to yellow. |
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| 24. |
Aluminium alloys are not susceptible to which of the following?(a) Macro shrinkage(b) Drossing(c) Micro shrinkage(d) Solidification shrinkage |
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Answer» Correct answer is (a) Macro shrinkage The best explanation: Aluminium alloys are susceptible to drossing, micro shrinkages and solidification shrinkages, but not to macro shrinkages. For the prevention of entering of dross in mold cavity, gating system is installed. |
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| 25. |
On which of the following factor, does weldability not depend?(a) Boiling point(b) Melting point(c) Thermal expansion(d) Thermal conductivity |
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Answer» Right answer is (a) Boiling point For explanation I would say: Weldability is dependent on five factors of the metal or alloying element. The factors being, melting point, thermal expansion, thermal conductivity, surface condition and change in the microstructure. |
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| 26. |
What is the density of copper alloys?(a) 6.67 g/cc(b) 7.87 g/cc(c) 8.93 g/cc(d) 5.77 g/cc |
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Answer» The correct choice is (c) 8.93 g/cc Best explanation: A steel is a mixture of iron and carbon and copper alloys are mixtures of mainly copper and a few other materials like zinc and nickel with it. The main copper alloys can be brass and bronze. The density of copper alloys in general is found to be 8.93 g/cc. |
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| 27. |
Electrodes used in spot welding are made up of which material?(a) Only Copper(b) Copper and tungsten(c) Copper and chromium(d) Copper and aluminium |
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Answer» Correct option is (d) Copper and aluminium To elaborate: The electrodes that are employed in the spot welding are required to possess a high amount of electrical and thermal conductivity. Hence, they are primarily made up of copper or copper and tungsten or copper and chromium. |
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| 28. |
Which of the following is not a material used for making an electrode in metal arc welding, for treating stainless steels?(a) Niobium(b) Columbium(c) Titanium(d) Potassium |
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Answer» Correct answer is (d) Potassium The explanation is: Stainless steels are best welded using the electric butt welding method and then followed by annealing at around 750°C to 800°C. Stainless steels can also be welded using the metal arc welding methods. For this the electrode which is needed is made up of niobium, titanium and columbium. These materials avoid the occurrence of the defect called weld decay. |
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| 29. |
In a neutral flame, what is the temperature in the inner core?(a) 3200°C(b) 2100°C(c) 1250°C(d) 2700°C |
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Answer» Right choice is (a) 3200°C Best explanation: When equal amount of oxygen and acetylene is made to react in a torch, a neutral flame gets produced. The inner core has a temperature of 3200°C, whereas the tip of the neutral flame has a temperature of 1250°C. |
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| 30. |
What is the flame temperature of acetylene?(a) 1700°C(b) 2200°C(c) 2800°C(d) 3200°C |
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Answer» Correct choice is (d) 3200°C Best explanation: Acetylene gas is a type of fuel gas that is used for the welding of thin sheets of steel which have a thickness of up to 50 mm. The flame temperature of acetylene gas is approximately about 3200°C. |
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| 31. |
What is the minimum temperature given before hot forging?(a) 100°C(b) 150°C(c) 200°C(d) 250°C |
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Answer» The correct choice is (c) 200°C For explanation: Hot forging is a method of forging articles at an extremely high temperature. But, before putting the article into the hot forging processes, it has to be heated to certain temperatures. The minimum temperature that has to be given to the article should be 200°C. |
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| 32. |
Which of the following material is not used as a flux in forge welding?(a) 2 parts of borax with one part of sal-ammoniac(b) Quartz sand(c) Calcined borax(d) 3 parts of borax with one part of sal-ammoniac |
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Answer» The correct option is (a) 2 parts of borax with one part of sal-ammoniac Best explanation: The metal which has to be welded, has to be first covered with flux. By covering it with flux, it cuts the metal from the air around and prevents from oxidation. The fluxes used for this purpose are quartz sand, calcined borax and 3 parts of borax with one part of sal-ammoniac. |
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| 33. |
Which effect is not seen in alloys on weldability?(a) Control of ductile-malleable transformation temperature(b) Provision for oxidation to molten metal(c) Reduction in segregation(d) Grain refinement |
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Answer» The correct option is (b) Provision for oxidation to molten metal Easy explanation: On weldability, there are some effects seen in the alloying elements. Some of them are Control of ductile-malleable transformation temperature, Reduction in segregation, Grain refinement and provision for deoxidation to the molten metal. |
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| 34. |
In forging dies, what is the minimum degree to which the drafts are made?(a) 1^o(b) 2^o(c) 3^o(d) 4^o |
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Answer» Right answer is (c) 3^o The explanation is: There are some types of allowances which have to be given to the system before the operations begin, like, shrinkage allowance, machining allowance and draft allowance. The minimum angle which can be given to the drafts is only 3^o. |
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| 35. |
The following figure represents which hand tool appliance?(a) Cross peen(b) Ball peen(c) Sledge(d) Straight pin |
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Answer» The correct option is (a) Cross peen The best explanation: Hand tools are often used when the work needed to be done is very short and can be done in small amount of time without the need of a machine, which would consume more energy and time. The following figure is that of a hand tool called as cross peen. |
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| 36. |
At what temperature does the high carbon steel get forged?(a) 950°C(b) 1510°C(c) 1150°C(d) 1290°C |
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Answer» Right answer is (c) 1150°C To explain: The high carbon steel is provided heat treatment, after this, the steel is allowed to quench and then tempered. They can be forged at a temperature of 1100°C. |
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| 37. |
Low carbon steels get forged at what temperature?(a) 670°C(b) 730°C(c) 820°C(d) 950°C |
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Answer» Right choice is (c) 820°C The explanation is: None. |
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| 38. |
What is the schedule rate for a Blacksmith in Lucknow?(a) Rs.350(b) Rs.150(c) Rs.30(d) Rs.150 |
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Answer» Correct choice is (a) Rs.350 Explanation: A blacksmith is a metalsmith who creates objects from wrought iron or steel by forging the metal, using tools to hammer, bend, and cut (cf. whitesmith). Blacksmiths produce objects such as gates, grilles, railings, light fixtures, furniture, sculpture, tools, agricultural implements, decorative and religious items, cooking utensils etc. |
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| 39. |
At what temperature does wrought irons get forged?(a) Below 1000°C(b) Below 1100°C(c) Below 1200°C(d) Below 1300°C |
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Answer» Right answer is (d) Below 1300°C The explanation is: Wrought irons are identified as alloys of iron which contain very low amount of carbon in them. Wrought irons can be forged at a temperature below 1300°C. |
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| 40. |
The ________________ is used for the application of the mortar between and around the stones as they are set into place.(a) hammer(b) tray(c) chisel(d) masonry trowel |
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Answer» Right answer is (d) masonry trowel To explain I would say: Filling in the gaps (joints) with mortar is referred to as pointing. Pointing in smaller joints can be accomplished using tuck pointers, pointing trowels, and margin trowels, among other tools. |
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| 41. |
Wrought ironwork is forged by a blacksmith using an __________(a) hammer(b) sponger(c) rafter(d) anvil |
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Answer» The correct option is (d) anvil To elaborate: Anvils are as massive as they are practical, because the higher their inertia, the more efficiently they cause the energy of striking tools to be transferred to the work piece. On a quality anvil, the smith’s hammer should rebound with almost as much energy as the smith puts into the downward stroke, ultimately making the smith’s job easier and less physically strenuous. |
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| 42. |
_________________ is required for preliminary studies of various aspects of a work or project.(a) Supplementary Estimate(b) Plinth Area Estimate(c) Revised Estimate(d) Abstract Estimate |
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Answer» Right choice is (d) Abstract Estimate The explanation is: to decide the financial position and policy for administrative sanction by the competent administrative authority. In case of commercial projects as irrigation projects as irrigation projects, residential building projects and similar projects which earn revenue income, the probable income may be worked out. |
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| 43. |
What is the SI unit for quality factor?(a) Hz(b) kHz(c) MHz(d) No unit |
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Answer» Correct option is (d) No unit To explain I would say: We know that Quality factor is equal to the resonant frequency divided by the bandwidth. It is one frequency divided by another hence it has no unit. |
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| 44. |
In _________________ system the source of supply is lake or impounding reservoir at some elevation.(a) parallel(b) gravity distribution(c) pumps distribution(d) rain distribution |
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Answer» Correct choice is (b) gravity distribution The best I can explain: This system is possible when the source of supply is lake or impounding reservoir at some elevation above the city so that sufficient pressure can be maintained in the mains. |
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| 45. |
The four-sided slopes are not the characteristic feature of only Mansard roofs the _______________ also come with this feature.(a) mansard roof(b) gambrel Roof(c) salt Box Roof(d) pyramid roof |
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Answer» The correct answer is (a) mansard roof Best explanation: The four-sided slopes are not the characteristic feature of only Mansard roofs; the Pyramid roofs also come with this feature. As the name suggests, these roofs are shaped like pyramids, a roof with four sloping sides. These roofs are best-suited for smaller structures, like a farmhouse hut. These roofs are popular in the contemporary architecture, with many structures getting these roofs. The walls of these houses are symmetrical and easy to build. A lower degree pitch works best for such four-sided roofs. They would work even better if the walls were smaller and the roof made for a significant part of the house. It is not only aesthetically pleasing, but also more energy efficient. |
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| 46. |
__________ is a large open space located within a building. It is often used to light a central circulation or public area by daylight admitted through a glass roof or wall.(a) Atrium(b) Solarium(c) Translucent walls(d) Skylights |
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Answer» Right option is (a) Atrium Explanation: Atria provide some daylight to adjacent working areas, but the amount is often small and does not penetrate very far. The main function of an atrium is to provide a visual experience and a degree of contact with the outside for people in the working areas. The daylighting of successive storeys of rooms adjoining an atrium is interdependent and requires a balanced approach. |
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| 47. |
The four-sided slopes are not the characteristic feature of only Mansard roofs; the _______________ also come with this feature.(a) amnsard roof(b) gambrel Roof(c) salt Box Roof(d) pyramid roof |
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Answer» Correct answer is (a) amnsard roof For explanation I would say: The four-sided slopes are not the characteristic feature of only Mansard roofs; the Pyramid roofs also come with this feature. As the name suggests, these roofs are shaped like pyramids, a roof with four sloping sides. These roofs are best-suited for smaller structures, like a farmhouse hut. These roofs are popular in the contemporary architecture, with many structures getting these roofs. The walls of these houses are symmetrical and easy to build. A lower degree pitch works best for such four-sided roofs. They would work even better if the walls were smaller and the roof made for a significant part of the house. It is not only aesthetically pleasing, but also more energy efficient. |
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| 48. |
The number of treads in a flight is equal to __________(a) risers in the flight(b) risers plus one(c) risers minus one(d) risers plus three |
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Answer» The correct option is (c) risers minus one Best explanation: The part of the stairway that is stepped on. It is constructed to the same specifications (thickness) as any other flooring. The tread “depth” is measured from the outer edge of the step to the vertical “riser” between steps. The “width” is measured from one side to the other. |
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| 49. |
As a very general guideline it is recommended that the bottom of the pit should be at least _______ above groundwater level.(a) 0.5 m(b) 2 m(c) 12 m(d) 20 m |
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Answer» Correct option is (b) 2 m Best explanation: As a very general guideline it is recommended that the bottom of the pit should be at least 2 m above groundwater level, and a minimum horizontal distance of 30 m between a pit and a water source is normally recommended to limit exposure to microbial contamination.[1]However, no general statement should be made regarding the minimum lateral separation distances required to prevent contamination of a well from a pit latrine. For example, even 50 m lateral separation distance might not be sufficient in a strongly karstified system with a down gradient supply well or spring, while 10 m lateral separation distance is completely sufficient if there is a well developed clay cover layer and the annular space of the groundwater well is well sealed. |
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| 50. |
Which is not a type of reservoir?(a) Small ground level reservoirs(b) Large ground level reservoirs(c) Underground reservoirs(d) Sub-surface reservoir |
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Answer» Right option is (d) Sub-surface reservoir Best explanation: Types of Reservoirs- i. Underground reservoirs. ii. Small ground level reservoirs. iii. Large ground level reservoirs. iv. Overhead tanks. |
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