TOP 20 MECHANICAL ENGINEERING OBJECTIVE QUESTION WITH ANSWERS

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1. The elasticity is the property of a material which enables it to.
A. regain its original shape after deformation when the external forces are removed.
B. draw into wires by the application of a tensile force.
C. resist fracture due to high impact loads.
D. retain deformation produced under load permanently.

2. The property of a material which enables it to be drawn into wires with the application of a tensile force, is called.
A. plasticity.
B. elasticity.
C. ductility.
D. malleability.

3. Which of the following material has the maximum ductility?
A. Mild steel.
B. Copper.
C. Zinc.
D. Aluminium.

4. The property of a material which enables it to resist fracture due to high impact loads, is called toughness.
A. True.
B. False.

5. Which of the following property is essential for spring materials?A. Stiffness.
B. Ductility.
C. Resilience.
D. Plasticity.

6. When a bolt is subject to an external load, the stress inducced in the bolt will be.
A. Tensil stress.
B. Shear stress.
C. Combined tensile and shear stress.
D. Any one of these.

7. When a nut is tightened by placing a washer below it, the bolt will be subjected to.
A. Tensile stress.
B. Compressive stress.
C. Shear stress.
D. None of these.

8. The flange coupling, the bolts are subjected to.
A. Tensil stress.
B. Compressive stress.
C. Shear stress.
D. None of these.

9. When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the.
A. Initial tension.
B. External load applied.
C. Sum of the inital tension and external load applied.
D. Initial tension or external load, whichever is greater.

10. When the bolt is very yielding as compared to the connected members, then the resultant load on the bolt will be equal to the.
A. Initial tension.
B. External load applied.
C. Sum of the initial tension and external load applied.
D. Initial tension or external load, whichever is greater.

11.The mass per unit volume of a liquid at a standard temperature and pressure is called.
A. Specific weight.
B. Mass density.
C. Specific gravity.
D. None of these.

12.The volume per unit mass of a liquid is called specific volume.
A. Yes.
B. No

13.The weight per unit volume of a liquid at a standard temperature and pressure is called.
A. Specific weight.
B. Mass density.
C. Specific gravity.
D. None of these.

14.The specific weight of water in S. I. units is taken as.
A. 9.81 kN/m3.
B. 9.81 × 10'3 N/m3.
C. 9.81 × 10_6N/mm3.
D. Any one of these.

15. The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called.
A. Density of liquid.
B. Specific gravity of liquid.
C. Compressibility of liquid.
D. Surface tension of liquid.

16. A definite area of a space where some thermodynamic process takes place is known as.
A:- Thermodynamic system.
B:- Thermodynamic cycle.
C:- Thermodynamic process.
D:- Thermodynamic law.

17. An open system is one in which.
A:- Heat and work crosses the boundary of the system, but the mass of the working substance does not crosses the boundary of the system.
B:- Mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system.
C:- Both the heat and work as well as mass of the working substance crosses the boundary of the system.
D:- Neither the heat and work nor the mass of the working substance crosses the boundary of the system.

18. In an extensive property of a thermodynamic system.
A:- Extensive heat is transferred.
B:- Extensive work is done.
C:- Extensive energy is utilised.
D:- None of these.

19. Which of the following is correct?
A:- Absolute pressure = Gauge pressure + Atmospheric pressure.
B:- Gauge pressure = Absolute pressure + Atmospheric pressure.
C:- Atmospheric pressure = Absolute pressure + Gauge pressure.
D:- Absolute pressure = Gauge pressure - Atmospheric pressure.

20. Which of the following statement is correct?
A:- The heat and work are boundary phenomenon.
B:- The heat and work represent the energy crossing the boundary of the system.
C:- The heat and work are path functions.
D:- All of the above.

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