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. |
What is the value of entropy at 273°K ?$ |
| A. | 0 |
| B. | 1 |
| C. | ‚àû |
| D. | none of these |
| Answer» B. 1 | |
| 2. |
The capital & running costs of similar machines having unequal service life can be compared by the __________ method. |
| A. | equivalant annual cost |
| B. | rate of return |
| C. | present net worth |
| D. | capitalised cost |
| Answer» E. | |
| 3. |
During sensible heating of humid air |
| A. | relative humidity increases. |
| B. | dew point remains constant. |
| C. | dry bulb & wet bulb temperature increases. |
| D. | both 'b' & 'c'. |
| Answer» E. | |
| 4. |
In BOF, desiliconisation is a first order reaction. So the silicon content of the metal decreases |
| A. | linearly with time. |
| B. | exponentially with time. |
| C. | logarithmically with time. |
| D. | in proportion to the square root of time. |
| Answer» B. exponentially with time. | |
| 5. |
Principal alloying element in Elinvar (used for making hair springs for watches) is |
| A. | copper |
| B. | aluminium |
| C. | nickel |
| D. | zinc |
| Answer» D. zinc | |
| 6. |
Main alloying element in Elinvar used in precision instruments, hair springs for watches etc. is |
| A. | chromium |
| B. | nickel |
| C. | zinc |
| D. | aluminium |
| Answer» C. zinc | |
| 7. |
Two stroke engine compared to a four stroke engine has |
| A. | higher efficiency. |
| B. | less fuel consumption. |
| C. | higher power to weight ratio. |
| D. | lower initial cost. |
| Answer» D. lower initial cost. | |
| 8. |
In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm. |
| A. | 0.5 |
| B. | 1 |
| C. | 5 |
| D. | 20 |
| Answer» D. 20 | |
| 9. |
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. | |
| 10. |
Metalloids |
| A. | are good conductor of heat & electricity. |
| B. | act as electron donors with metals & as electron acceptor with non-metals. |
| C. | are not necessarily solids at room temperature. |
| D. | are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron. |
| Answer» E. | |
| 11. |
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 | |
| 12. |
The minimum and the maximum number of members required to form a Private Limited Joint Stock Company are respectively |
| A. | 7 and 30 |
| B. | 10 and 50 |
| C. | 2 and 50 |
| D. | 13 and 55 |
| Answer» D. 13 and 55 | |
| 13. |
Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.A. Induced draft fan B. Economiser C. Air preheater D. Steam superheater Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories ? |
| A. | A, C, B, D |
| B. | D, B, C, A |
| C. | D, C, B, A |
| D. | D, A, B, C |
| Answer» C. D, C, B, A | |
| 14. |
Fatigue life is expected to increase by |
| A. | increasing the size of the sample. |
| B. | smooth polishing of the surface of the sample. |
| C. | having compressive residual stresses at the surface. |
| D. | having tensile residual stresses at the surface. |
| Answer» D. having tensile residual stresses at the surface. | |
| 15. |
The most commonly used moderator in nuclear power plant is |
| A. | graphite |
| B. | light water |
| C. | heavy water |
| D. | berellium |
| Answer» B. light water | |
| 16. |
Holes in a plate for rivetted joints is preferably made by |
| A. | drilling |
| B. | tapping |
| C. | reaming |
| D. | punching |
| Answer» B. tapping | |
| 17. |
Identify the correct statement. |
| A. | Sphlerite is zinc oxide. |
| B. | The first law of the thermodynamics is stated as δE = δQ - δW. |
| C. | Lead can be produced in a blast furnace. |
| D. | T. ferrooxidans is a fungus that can be used for leaching chalcopyrite. |
| Answer» D. T. ferrooxidans is a fungus that can be used for leaching chalcopyrite. | |
| 18. |
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 | |
| 19. |
Property of a material to resist a tensile force without giving away is a measure of its |
| A. | stiffness |
| B. | toughness |
| C. | resilience |
| D. | tenacity |
| Answer» E. | |
| 20. |
The stress at which a metal fails by fatigue lies |
| A. | near the fracture point of the stress-strain curve. |
| B. | in the plastic range. |
| C. | in the elastic range. |
| D. | none of these. |
| Answer» D. none of these. | |
| 21. |
Biological shield in a nuclear reactor is generally provided to protect against the |
| A. | α-rays |
| B. | β-rays |
| C. | gamma rays & neutrons |
| D. | electrons |
| Answer» D. electrons | |
| 22. |
Chlorine acts as a bleaching agent only in the presence of |
| A. | dry air |
| B. | pure oxygen |
| C. | moisture |
| D. | sunlight |
| Answer» D. sunlight | |
| 23. |
In __________ process, there is an increase in entropy with no degradation of energy. |
| A. | isothermal expansion |
| B. | isochoric heat addition |
| C. | polytropic expansion |
| D. | isobaric heat addition |
| Answer» B. isochoric heat addition | |
| 24. |
The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 - T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by |
| A. | T1/(T1-T2) |
| B. | T2/(T1-T2) |
| C. | T1/T2 |
| D. | T2/T1 |
| Answer» C. T1/T2 | |
| 25. |
The following thermocouple may be used for measuring temperature upto 1873°K.$ |
| A. | Chromel-alumel |
| B. | Copper-constantan |
| C. | Platinum-platinum rhodium |
| D. | Iron-constatan |
| Answer» D. Iron-constatan | |
| 26. |
The suction and delivery pressure for a two stage compressor are 1 and 25 atm respectively. The intermediate stage pressure would be around __________ atm. |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» B. 10 | |
| 27. |
Which of the following commonly used condenser tube materials has the lowest thermal conductivity? |
| A. | Admirability brass. |
| B. | Stainless steel. |
| C. | Aluminium brass. |
| D. | Titanium. |
| Answer» C. Aluminium brass. | |
| 28. |
__________ test can be termed as the semi-distructive test. |
| A. | Impact |
| B. | Torsion |
| C. | Hardness |
| D. | Charpy |
| Answer» D. Charpy | |
| 29. |
With increase in steam pressure, its specific volume decreases |
| A. | rapidly first and then slowly. |
| B. | linearly. |
| C. | slowly first and then rapidly. |
| D. | exponentially. |
| Answer» B. linearly. | |
| 30. |
The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm mole, its fugacity at 300 K would be |
| A. | 3171Pa |
| B. | 3567Pa |
| C. | 1.01 x 105Pa |
| D. | 5000Pa |
| Answer» C. 1.01 x 105Pa | |
| 31. |
Use of water as a manometric liquid suffers from the disadvantage of its |
| A. | low vapour pressure. |
| B. | corrosive nature. |
| C. | high vapour pressure. |
| D. | high boiling point. |
| Answer» D. high boiling point. | |
| 32. |
Out of the following, the alloy which has equal percentage of constituents, is |
| A. | white metal |
| B. | gun metal |
| C. | duralumin |
| D. | constanton |
| Answer» E. | |
| 33. |
Working of linear variable differential transducer (LVDT) is based on the principle of variable |
| A. | capacitance |
| B. | resistance |
| C. | mutual inductance |
| D. | none of these |
| Answer» D. none of these | |
| 34. |
Which is the only metal that exists in liquid state at room temperature? |
| A. | Sodium |
| B. | Mercury |
| C. | Lithium |
| D. | Strontium |
| Answer» C. Lithium | |
| 35. |
Electrostatic separation of minerals from each other is based on their differences in the following property. |
| A. | Densities. |
| B. | Magnetic permeabilities. |
| C. | Electrical conductivities. |
| D. | Hardness. |
| Answer» D. Hardness. | |
| 36. |
Chalcopyrite is an ore of |
| A. | lead |
| B. | aluminium |
| C. | copper |
| D. | zinc |
| Answer» D. zinc | |
| 37. |
Pig iron is a product of |
| A. | electric arc furnace |
| B. | cupola |
| C. | blast furnace |
| D. | open hearth furnace |
| Answer» D. open hearth furnace | |
| 38. |
Pearlite comprises of |
| A. | 87% cementite & 13% Fe. |
| B. | 87% ferrite & 13% cementite. |
| C. | 93.33% ferrite & 6.67% C. |
| D. | 87% ferrite & 13% C. |
| Answer» C. 93.33% ferrite & 6.67% C. | |
| 39. |
Spheriodising of a material is a/an __________ process. |
| A. | normalising |
| B. | annealing |
| C. | tempering |
| D. | hardening |
| Answer» C. tempering | |
| 40. |
In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material ? |
| A. | Tin |
| B. | Lead |
| C. | Zinc |
| D. | Glass |
| Answer» E. | |
| 41. |
Which of the following rays has the least wavelength? |
| A. | Ultraviolet rays |
| B. | Infrared rays |
| C. | Cosmic rays |
| D. | X-rays |
| Answer» D. X-rays | |
| 42. |
The capacity of a material to absorb energy depends upon both its strength & stiffness. The term 'stiffness' of a material is the opposite of its |
| A. | flexibility |
| B. | plasticity |
| C. | hardness |
| D. | hardenability |
| Answer» B. plasticity | |
| 43. |
If the pH value of a solution of sodium chloride is 7; then what will be the pH value of the solution after its electrolysis ? |
| A. | 7 |
| B. | < 7 |
| C. | > 7 |
| D. | 0 |
| Answer» D. 0 | |
| 44. |
Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner ? |
| A. | Output & fineness |
| B. | Velocity |
| C. | Both (a) & (b) |
| D. | None of these |
| Answer» D. None of these | |
| 45. |
Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution |
| A. | A1 is more alkaline than solution A2. |
| B. | A1 is highly acidic. |
| C. | A2 is very slightly acidic. |
| D. | both(b) & (c). |
| Answer» E. | |
| 46. |
Thermodynamic cycle involved in the working of a thermal power plant is the __________ cycle. |
| A. | Joule |
| B. | Carnot |
| C. | Rankine |
| D. | Brayton |
| Answer» D. Brayton | |
| 47. |
Thermoplastics are never moulded using |
| A. | injection moulding |
| B. | blow moulding |
| C. | extrusion |
| D. | compression moulding |
| Answer» E. | |
| 48. |
Austempering of steel requires.it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to$ |
| A. | sorbite |
| B. | bainite |
| C. | martensite |
| D. | troostite |
| Answer» C. martensite | |
| 49. |
Oxygen cylinders used for autogenous (cutting/welding) purposes are |
| A. | seamless & made of steel. |
| B. | heat treated before use. |
| C. | made by sand casting. |
| D. | welded steel cylinders. |
| Answer» B. heat treated before use. | |
| 50. |
Liquid nitrogen containers can be made from |
| A. | ferritic stainless steel |
| B. | HSLA steel |
| C. | titanium |
| D. | austenitic stainless steel |
| Answer» C. titanium | |