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 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 | |
| 2. |
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 | |
| 3. |
The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D.# |
| A. | 140 |
| B. | 180 |
| C. | 240 |
| D. | 280 |
| Answer» E. | |
| 4. |
Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10⁻² atm, the partial pressure of B is 10⁻³ atm and the partial pressure of AB is 1 atm, the equilibrium constant 'K' is# |
| A. | 10 atmv |
| B. | 10⁵ atm⁻¹ |
| C. | 10 (dimensionless) |
| D. | 10⁵ (dimensionless) |
| Answer» C. 10 (dimensionless) | |
| 5. |
Which of the following has the highest modulus of elasticity (about 7 x 10⁶ kg/cm²) ?# |
| A. | High speed steel |
| B. | Stainless steel |
| C. | Tungsten carbide |
| D. | Superalloys |
| Answer» D. Superalloys | |
| 6. |
Which of the following materials does not form adherent oxide film on surface? |
| A. | Copper |
| B. | Nickel |
| C. | Aluminium |
| D. | Gold & silver |
| Answer» E. | |
| 7. |
Cupola produces __________ iron. |
| A. | Pig |
| B. | Cast |
| C. | Wrought |
| D. | Carbon free |
| Answer» C. Wrought | |
| 8. |
Which of the following does not come under the category of electrochemical corrosion? |
| A. | Corrosion in organic liquids |
| B. | Atmospheric corrosion in moist gas or air |
| C. | Soil corrosion as in the case of underground pipes |
| D. | Corrosion in sea water and molten metals |
| Answer» B. Atmospheric corrosion in moist gas or air | |
| 9. |
Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m² of steel strip.# |
| A. | 5-10 |
| B. | 1000-1500 |
| C. | 120-500 |
| D. | 1500-3000 |
| Answer» D. 1500-3000 | |
| 10. |
Which of the following mainly decides the current to be employed is arc welding? |
| A. | Electrode size |
| B. | Plate thickness |
| C. | Voltage across the arc |
| D. | Welded portion length |
| Answer» B. Plate thickness | |
| 11. |
Saturated steam at a pressure of 25 kg/cm² is throttled to attain 5 kg/cm² . Then the outcoming steam will be# |
| A. | Wet |
| B. | Saturated |
| C. | Superheated |
| D. | None of these |
| Answer» D. None of these | |
| 12. |
What happens, when SO‚ÇÇ is passed through a solution of H‚ÇÇS in water?# |
| A. | Precipitation of sulphur takes place |
| B. | H‚ÇÇSO‚ÇÉ is formed |
| C. | Oleum is formed |
| D. | None of these |
| Answer» B. H‚Äö√á√áSO‚Äö√á√â is formed | |
| 13. |
The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K⁻¹mole⁻¹)# |
| A. | 2300 J |
| B. | 4600 J |
| C. | 230 J |
| D. | 2.3 x 106 J |
| Answer» B. 4600 J | |
| 14. |
The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr.# |
| A. | 100 |
| B. | 200 |
| C. | 1000 |
| D. | 2000 |
| Answer» C. 1000 | |
| 15. |
A metalloid possesses the characteristics of both the metals and non-metals. Which of the following is not a metalloid? |
| A. | Arsenic |
| B. | Antimony |
| C. | Lead |
| D. | None of these |
| Answer» D. None of these | |
| 16. |
Which of the following is the most suitable for removing fine particles (< 1 micron diameter) from air below its dew point? |
| A. | Venturi scrubber |
| B. | Electrostatic precipitator |
| C. | Cyclone separator |
| D. | Fabric filter |
| Answer» C. Cyclone separator | |
| 17. |
Which of the following gases cause global warming? |
| A. | Carbon monoxide |
| B. | Carbon dioxide |
| C. | Nitrogen |
| D. | Ozone |
| Answer» C. Nitrogen | |
| 18. |
Which of the following is not an ore of aluminium? |
| A. | Troosite |
| B. | Kaolin |
| C. | Alunite |
| D. | Cryolite |
| Answer» B. Kaolin | |
| 19. |
A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre.# |
| A. | 0.01 |
| B. | 0.1 |
| C. | 0.25 |
| D. | 0.5 |
| Answer» C. 0.25 | |
| 20. |
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 | |
| 21. |
The activity of pure hydrogen gas at 1000°C and 5 atm pressure# |
| A. | Is always less than 1 |
| B. | Is always greater than 1 |
| C. | Can be 5 |
| D. | Depends on the choice of the standard state |
| Answer» E. | |
| 22. |
Which of the following fastening devices has its both ends threaded? |
| A. | Bolt |
| B. | Stud |
| C. | Set screw |
| D. | Split nut |
| Answer» C. Set screw | |
| 23. |
Which of the following is a weak acid? |
| A. | HF |
| B. | HCl |
| C. | HI |
| D. | HBr |
| Answer» B. HCl | |
| 24. |
Which of the following metals can not be hot worked at room temperature? |
| A. | Zinc |
| B. | Nickel |
| C. | Lead |
| D. | Tin |
| Answer» C. Lead | |
| 25. |
__________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C.# |
| A. | Borosilicate |
| B. | High silica |
| C. | Supermax |
| D. | Lead |
| Answer» D. Lead | |