MCQOPTIONS
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MCQOPTIONS
This section includes 614 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The temperature required for full annealing in hyper-eutectoid steel is |
| A. | 30° C to 50° C above upper critical temperature |
| B. | 30° C to 50° C below upper critical temperature |
| C. | 30° C to 50° C above lower critical temperature |
| D. | 30° C to 50° C below lower critical temperature |
| Answer» D. 30° C to 50° C below lower critical temperature | |
| 2. |
Which of the following is not an application of nanomaterials? |
| A. | TV and computer monitors |
| B. | Cardiology |
| C. | Magnetic Resonance Imaging (MRI) |
| D. | Sunscreens and fuel cells |
| Answer» C. Magnetic Resonance Imaging (MRI) | |
| 3. |
Which one of the following is non-linear material? |
| A. | Zirconium oxide |
| B. | Magnetite |
| C. | Maghemite |
| D. | Lithium niobate |
| Answer» E. | |
| 4. |
Which type of material expands and contract in response to an applied electric field? |
| A. | Advanced material |
| B. | Smart material |
| C. | Biomaterial |
| D. | Nanomaterial |
| Answer» C. Biomaterial | |
| 5. |
Polymers are used in the chemical industry because of their ___________ |
| A. | Inert nature |
| B. | Light weight |
| C. | Low cost |
| D. | Easiness in fabricability |
| Answer» B. Light weight | |
| 6. |
Which one of the following is the best heat and corrosion resistant material? |
| A. | Metals |
| B. | Ceramics |
| C. | Polymers |
| D. | Semi-conductors |
| Answer» C. Polymers | |
| 7. |
Which of the following is not an aerospace material? |
| A. | Plastics |
| B. | Silica |
| C. | Aluminium alloys |
| D. | Polymers |
| Answer» E. | |
| 8. |
Which of the following is not an inorganic functional material? |
| A. | Ferroelectric |
| B. | Reverse micelles |
| C. | Magnetic field sensor |
| D. | Light detectors |
| Answer» C. Magnetic field sensor | |
| 9. |
Based on the important category, concrete and fibre glass are the examples of ___________ |
| A. | Ceramics |
| B. | Polymers |
| C. | Composites |
| D. | Semi-conductors |
| Answer» D. Semi-conductors | |
| 10. |
The temperature point at which the change ends on heating the steel is called |
| A. | lower critical point |
| B. | upper critical point |
| C. | point of recalescence |
| D. | point of decalescence |
| Answer» C. point of recalescence | |
| 11. |
Chromium when added to steel __________ the tensile strength. |
| A. | does not effect |
| B. | decreases |
| C. | increases |
| D. | None of these |
| Answer» D. None of these | |
| 12. |
The slow cooling of steel from the __________ results in a coarse grained structure. |
| A. | lower critical point |
| B. | upper critical point |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 13. |
The malleability is the property of a material by virtue of which a material |
| A. | regains its shape and size after the removal of external forces |
| B. | retains the deformation produced under load permanently |
| C. | can be drawn into wires with the application of a tensile force |
| D. | can be rolled or hammered into thin sheets |
| Answer» E. | |
| 14. |
Corrosion resistance of steel is increased by adding nickel and chromium. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 15. |
Silicon in cast iron |
| A. | makes the iron soft and easily machinable |
| B. | increases hardness and brittleness |
| C. | makes the iron white and hard |
| D. | aids fusibility and fluidity |
| Answer» B. increases hardness and brittleness | |
| 16. |
When a low carbon steel is heated upto lower critical temperature, |
| A. | there is no change in grain size |
| B. | the average grain size is a minimum |
| C. | the grain size increases very rapidly |
| D. | the grain size first increases and then decreases very rapidly |
| Answer» B. the average grain size is a minimum | |
| 17. |
A steel containing 16 to 18% chromium and about 0.12% carbon is called |
| A. | ferritic stainless steel |
| B. | austenitic stainless steel |
| C. | martensitic stainless steel |
| D. | nickel steel |
| Answer» B. austenitic stainless steel | |
| 18. |
The nuts and bolts are made from silicon steel. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 19. |
Chilled cast iron is produced |
| A. | by adding magnesium to molten cast iron |
| B. | by quick cooling of molten cast iron |
| C. | from white cast iron by annealing process |
| D. | none of these |
| Answer» C. from white cast iron by annealing process | |
| 20. |
The high speed steel has __________ percentage of tungsten. |
| A. | maximum |
| B. | minimum |
| C. | Can't say |
| D. | None of these |
| Answer» B. minimum | |
| 21. |
The steel produced by cementation process is known as __________ steel. |
| A. | blister |
| B. | crucible |
| C. | Can't say |
| D. | None of these |
| Answer» B. crucible | |
| 22. |
An aluminium alloy with 11% silicon is used for making engine pistons by die casting technique. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 23. |
Which of the following inpurity in cast iron makes it hard and brittle? |
| A. | Silicon |
| B. | Sulphur |
| C. | Manganese |
| D. | Phosphorus |
| Answer» C. Manganese | |
| 24. |
The iron ore mostly used for the production of pig iron is |
| A. | magnetite |
| B. | haematite |
| C. | limonite |
| D. | siderite |
| Answer» C. limonite | |
| 25. |
In a face centred cubic space lattice, there are |
| A. | nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre |
| B. | fourteen atoms out of which eight atoms are located at the corners of the cube and six atoms at the centres of six faces |
| C. | seventeen atoms out of which twelve atoms are located at the twelve corners of the hexagonal prism, one atom at the centre of each of the two hexagonal faces and three atoms are symmetrically arranged in the body of the cell |
| D. | none of the above |
| Answer» C. seventeen atoms out of which twelve atoms are located at the twelve corners of the hexagonal prism, one atom at the centre of each of the two hexagonal faces and three atoms are symmetrically arranged in the body of the cell | |
| 26. |
The machinability of aluminium increases when __________ is added to aluminium. |
| A. | copper |
| B. | magnesium |
| C. | silicon |
| D. | lead and bismuth |
| Answer» E. | |
| 27. |
The defect which takes place due to imperfect packing of atoms during crystallisation is known as |
| A. | line defect |
| B. | surface defect |
| C. | point defect |
| D. | none of these |
| Answer» D. none of these | |
| 28. |
The catalysts are used to accelerate the chemical reaction during the process of ploymerisation of plastics. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 29. |
Spheroidal grey cast iron has graphite flakes. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 30. |
Nichrome contains more iron than Inconel. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 31. |
The temperature in the upper part of the blast furnace (zone of reduction) is __________ that of the middle part. |
| A. | equal to |
| B. | less than |
| C. | more than |
| D. | None of these |
| Answer» C. more than | |
| 32. |
Aluminium has low density and addition of silicon improves its fluidity and therefore, its castability. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 33. |
In low carbon steels, presence of small quantities of sulphur improves |
| A. | weldability |
| B. | formability |
| C. | machinability |
| D. | hardenability |
| Answer» D. hardenability | |
| 34. |
The maximum solubility of carbon in austenite is 1.7% at 1130° C. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 35. |
Which of the following is a point imperfection? |
| A. | Vacancy |
| B. | Interstitial imperfection |
| C. | Frenkel imperfection |
| D. | all of these |
| Answer» E. | |
| 36. |
Babbit metal contains |
| A. | 50% tin and 50% antimony |
| B. | 66% tin, 30% copper and 4% antimony |
| C. | 88% tin, 4% copper and 8% antimony |
| D. | 92% tin, 6% copper and 2% antimony |
| Answer» D. 92% tin, 6% copper and 2% antimony | |
| 37. |
Polyvinylchloride (PVC) is a __________ material. |
| A. | thermoplastic |
| B. | thermosetting |
| C. | Can't say |
| D. | None of these |
| Answer» B. thermosetting | |
| 38. |
The process which improves the machinability of steels, but lowers the hardness and tensile strength, is |
| A. | normalising |
| B. | full annealing |
| C. | process annealing |
| D. | spheroidising |
| Answer» E. | |
| 39. |
Which of the following material has maximum malleability? |
| A. | Lead |
| B. | Soft steel |
| C. | Wrought iron |
| D. | Copper |
| Answer» B. Soft steel | |
| 40. |
The ability of a material to undergo large permanent deformation with the application of a tensile force, is called ductility. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 41. |
Silicon is added in low carbon steels to |
| A. | make the steel tougher and harder |
| B. | make the steel of good bending qualities |
| C. | raise the yield point |
| D. | all of these |
| Answer» B. make the steel of good bending qualities | |
| 42. |
The ductility is the property of a material due to which it |
| A. | can be drawn into wires |
| B. | breaks with little permanent distortion |
| C. | can be rolled or hammered into thin sheets |
| D. | can resist fracture due to high impact loads |
| Answer» B. breaks with little permanent distortion | |
| 43. |
The machine tool guide ways are usually hardened by |
| A. | vacuum hardening |
| B. | martempering |
| C. | induction hardening |
| D. | flame hardening |
| Answer» E. | |
| 44. |
When a steel containing more than 0.8% carbon is cooled slowly below the lower critical point, it consists of |
| A. | mainly pearlite |
| B. | mainly ferrite |
| C. | ferrite and pearlite |
| D. | pearlite and cementite |
| Answer» E. | |
| 45. |
In induction hardening __________ is high. |
| A. | current |
| B. | voltage |
| C. | frequency |
| D. | temperature |
| Answer» D. temperature | |
| 46. |
In corrosion resistant properties, bronzes are __________ to brasses. |
| A. | superior |
| B. | inferior |
| C. | Can't say |
| D. | None of these |
| Answer» B. inferior | |
| 47. |
Tin base white metals are used where the bearings are subjected to |
| A. | large surface wear |
| B. | elevated temperatures |
| C. | light load and pressure |
| D. | high pressure and load |
| Answer» B. elevated temperatures | |
| 48. |
The malleability is the property of a material due to which it can be rolled or hammered into thin sheets. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 49. |
Cast iron is used in those parts which are subjected to shocks. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 50. |
Admirality gun metal contains |
| A. | 60% copper, 35% zinc and 5% manganese |
| B. | 76% copper, 20% silicon and 4% zinc |
| C. | 82% copper, 12% zinc and 6% manganese |
| D. | 88% copper, 10% tin and 2% zinc |
| Answer» E. | |