McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
| 1. |
The property by which a body returns to its original shape after removal of the force is called |
| A. | plasticity |
| B. | elasticity |
| C. | ductility |
| D. | malleability |
| Answer» B. elasticity | |
| Explanation: when an external force acts on a body, the body tends to undergo some deformation. if the external force is removed and the body comes back to its original shape and size, the body is known as elastic body and this property is called elasticity. | |
| 2. |
The property of a material by which it can be beaten or rolled into thin plates is called |
| A. | malleability |
| B. | plasticity |
| C. | ductility |
| D. | elasticity |
| Answer» A. malleability | |
| Explanation: a material can be beaten into thin plates by its property of malleability. | |
| 3. |
Which law is also called as the elasticity law? |
| A. | bernoulli’s law |
| B. | stress law |
| C. | hooke’s law |
| D. | poisson’s law |
| Answer» C. hooke’s law | |
| Explanation: the hooke”s law is valid under the elastic limit of a body. it itself states that stress is proportional to the strain within the elastic limit. | |
| 4. |
The materials which have the same elastic properties in all directions are called |
| A. | isotropic |
| B. | brittle |
| C. | homogeneous |
| D. | hard |
| Answer» A. isotropic | |
| Explanation: same elastic properties in all direction is called the homogenity of a material. | |
| 5. |
A member which does not regain its original shape after removal of the load producing deformation is said |
| A. | plastic |
| B. | elastic |
| C. | rigid |
| D. | none of the mentioned |
| Answer» A. plastic | |
| Explanation: a plastic material does not | |
| 6. |
The body will regain it is previous shape and size only when the deformation caused by the external forces, is within a certain limit. What is that limit? |
| A. | plastic limit |
| B. | elastic limit |
| C. | deformation limit |
| D. | none of the mentioned |
| Answer» B. elastic limit | |
| Explanation: the body only regain its previous shape and size only upto its elastic limit. | |
| 7. |
The materials which have the same elastic properties in all directions are called |
| A. | isotropic |
| B. | brittle |
| C. | homogenous |
| D. | hard |
| Answer» A. isotropic | |
| Explanation: isotropic materials have the same elastic properties in all directions. | |
| 8. |
As the elastic limit reaches, tensile strain |
| A. | increases more rapidly |
| B. | decreases more rapidly |
| C. | increases in proportion to the stress |
| D. | decreases in proportion to the stress |
| Answer» A. increases more rapidly | |
| Explanation: on reaching the tensile stress to the elastic limit after the proportionality limit, the stress is no longer proportional to the strain. then the value of strain rapidly increases. | |
| 9. |
What kind of elastic materials are derived from a strain energy density function? |
| A. | cauchy elastic materials |
| B. | hypo elastic materials |
| C. | hyper elastic materials |
| D. | none of the mentioned |
| Answer» C. hyper elastic materials | |
| Explanation: the hyper elastic materials are derived from a strain energy density function. a model is hyper elastic if and only if it is possible to express the cauchy stress tensor as a function of the deformation gradient. | |
| 10. |
What the number that measures an object’s resistance to being deformed elastically when stress is applied to it? |
| A. | elastic modulus |
| B. | plastic modulus |
| C. | poisson’s ratio |
| D. | stress modulus |
| Answer» A. elastic modulus | |
| Explanation: the elastic modulus is the ratio of stress to strain. | |
| 11. |
The slope of the stress-strain curve in the elastic deformation region is |
| A. | elastic modulus |
| B. | plastic modulus |
| C. | poisson’s ratio |
| D. | none of the mentioned |
| Answer» A. elastic modulus | |
| Explanation: the elastic modulus is the ratio of stress and strain. so on the stress strain curve, it is the slope. | |
| 12. |
What is the stress-strain curve? |
| A. | it is the percentage of stress and stain |
| B. | it is the relationship between stress and strain |
| C. | it is the difference between stress and strain |
| D. | none of the mentioned |
| Answer» B. it is the relationship between stress and strain | |
| Explanation: the relationship between stress | |
| 13. |
Which point on the stress strain curve occurs after the proportionality limit? |
| A. | upper yield point |
| B. | lower yield point |
| C. | elastic limit |
| D. | ultimate point |
| Answer» C. elastic limit | |
| Explanation: the curve will be stress strain proportional upto the proportionality limit. after these, the elastic limit will occur. | |
| 14. |
Which point on the stress strain curve occurs after the lower yield point? |
| A. | yield plateau |
| B. | upper yield point |
| C. | ultimate point |
| D. | none of the mentioned |
| Answer» A. yield plateau | |
| Explanation: the points on the curve comes in the given order, | |
| 15. |
Which point on the stress strain curve occurs after yield plateau? |
| A. | lower yield point |
| B. | upper yield point |
| C. | ultimate point |
| D. | breaking point |
| Answer» C. ultimate point | |
| Explanation: after the yield plateau the curve will go up to its maximum limit of stress which is its ultimate point. | |
| 16. |
Which point on the stress strain curve occurs after the ultimate point? |
| A. | last point |
| B. | breaking point |
| C. | elastic limit |
| D. | material limit |
| Answer» B. breaking point | |
| Explanation: after the ultimate point the value of stress will reduce on increasing of strain and ultimately the material will break. | |
| 17. |
Elastic limit is the point |
| A. | up to which stress is proportional to strain |
| B. | at which elongation takes place without application of additional load |
| C. | up to which if the load is removed, original volume and shapes are regained |
| D. | none of the mentioned |
| Answer» C. up to which if the load is removed, original volume and shapes are regained | |
| Explanation: the elastic limit is that limit up to which any material behaves like an elastic material. | |
| 18. |
What is the point P shown on the stress strain curve? |
| A. | upper yield point |
| B. | yield plateau |
| C. | elastic limit |
| D. | ultimate point |
| Answer» D. ultimate point | |
| Explanation: it is the point showing the maximum stress to which the material can be subjected in a simple tensile stress. | |
| 19. |
What is the point P shown in the stress- strain curve? |
| A. | lower yield point |
| B. | elastic limit |
| C. | proportionality limit |
| D. | breaking point |
| Answer» D. breaking point | |
| Explanation: the breaking point is the point where the material breaks. the breaking point will be the last point on the stress strain curve. | |
| 20. |
What is the point shown in the stress strain curve? |
| A. | elastic limit |
| B. | lower yield point |
| C. | yield plateau |
| D. | lower strain point |
| Answer» B. lower yield point | |
| Explanation: it is the lower yield point at which the curve levels off and plastic deformation begins. | |
| 21. |
Where is the necking region? |
| A. | the area between lower yield point and upper yield point |
| B. | the area between the plastic limit and elastic limit |
| C. | the area between the ultimate point and initial point |
| D. | the area between the ultimate point and rupture |
| Answer» D. the area between the ultimate point and rupture | |
| Explanation: necking is a tensile strain deformation which is cased in after the ultimate amount of stress occurs in the material. | |
| 22. |
What is the elastic modulus of steel? |
| A. | 69-79 gpa |
| B. | 41-45 gpa |
| C. | 190-217 gpa |
| D. | 330-360 gpa |
| Answer» C. 190-217 gpa | |
| Explanation: steel has an elastic modulus of 190-217 gpa. it has e higher than aluminum and magnesium alloys. but lower than tungsten and molybdenum alloys. | |
| 23. |
What is the elastic modulus of titanium alloys? |
| A. | 150-170 gpa |
| B. | 180-214 gpa |
| C. | 80-130 gpa |
| D. | 41-45 gpa |
| Answer» C. 80-130 gpa | |
| Explanation: titanium alloys have the elastic modulus in the range of 80 to 130 gpa. it is greater than aluminum and magnesium alloys but lesser than steel. | |
| 24. |
What is the order of elastic modulus for Nickel alloys, Lead alloys, Molybdenum alloys, alumina? |
| A. | pb < mo < ni < al2o3 |
| B. | ni < pb < mo < al2o3 |
| C. | pb < ni < mo < al2o3 |
| D. | pb < ni < al2o3 < mo |
| Answer» C. pb < ni < mo < al2o3 | |
| Explanation: lowest elastic modulus is of lead and its alloys of 14-18 gpa. ni and mo alloys have elastic modulus of 180-214 and 330-360 gpa respectively. al2o3 has highest e among the four of 415 gpa. | |
| 25. |
What property enhances with a decrease in E? |
| A. | flexibility |
| B. | stiffness |
| C. | hardness |
| D. | uts |
| Answer» A. flexibility | |
| Explanation: the lower the elastic modulus of material, the more flexible it is. bending of material becomes easier. on the other hand, stiffness decreases. | |
| 26. |
What is the unit of elastic modulus? |
| A. | mohs |
| B. | gpa |
| C. | kg |
| D. | n |
| Answer» B. gpa | |
| Explanation: elastic modulus is expressed in gpa. mohs is the unit used for hardness. | |
| 27. |
When applied stress is of shear type, the modulus of elasticity is known as |
| A. | bulk modulus |
| B. | modulus of resilience |
| C. | shear modulus |
| D. | stiffness |
| Answer» C. shear modulus | |
| Explanation: when the type of stress applied is shear, e is known as shear modulus. it is also known as modulus of rigidity. stiffness is measured in terms of e. | |
| 28. |
Which of the following tensile property is dimensionless? |
| A. | tensile stress |
| B. | elastic modulus |
| C. | true strain |
| D. | toughness |
| Answer» C. true strain | |
| Explanation: true strain is dimensionless property. tensile strength and elastic modulus are measured in mpa and gpa respectively. | |
| 29. |
What is a factor which controls the elastic modulus? |
| A. | alloying |
| B. | heat treatment |
| C. | interatomic forces |
| D. | cold working |
| Answer» C. interatomic forces | |
| Explanation: on a constant temperature and pressure, e only is function of two factors. | |
| 30. |
Stress should not exceed when in service. |
| A. | yield strength |
| B. | tensile strength |
| C. | fracture strength |
| D. | toughness |
| Answer» A. yield strength | |
| Explanation: above yield strength, material starts to deform plastically. it causes a change in dimensions and properties of a material. so material should be used below it. | |
| 31. |
Stress should not exceed when in mechanical working |
| A. | yield strength |
| B. | tensile strength |
| C. | fracture strength |
| D. | toughness |
| Answer» B. tensile strength | |
| Explanation: mechanical working process consists of plastic deformation. so it is performed above yield strength. but it is limited below tensile strength so as to avoid fracture. | |
| 32. |
Ductility of material is its ability to flow plastically under compressive load. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: ductility is a tensile property. it is studied under tensile loading. it is the ability to plastic flow without rupture. | |
| 33. |
Work per unit volume of the material is a known modulus of toughness. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: toughness is measured by the amount of work per unit volume of the material under static loading. work per unit volume of material is called modulus of toughness. | |
| 34. |
Which of the following cannot be determined using a torsion test? |
| A. | modulus of elasticity in shear |
| B. | torsion yield strength |
| C. | modulus of rupture |
| D. | young’s modulus |
| Answer» D. young’s modulus | |
| Explanation: modulus of elasticity in shear, torsion yield strength and modulus of rupture can all be determined by performing torsion test on material. | |
| 35. |
What is the use of weight head in a torsion testing equipment? |
| A. | holding the job only |
| B. | holding the job and applying twisting moment |
| C. | holding the job and measuring the twisting moment |
| D. | it is not a part of torsion testing equipment |
| Answer» C. holding the job and measuring the twisting moment | |
| Explanation: the main job of weight head is to hold the job and measure the twisting moment.while twisting head holds the other end of job and applies twisting moment. | |
| 36. |
Which of the following is used to measure how much the specimen is twisted? |
| A. | micrometer |
| B. | clinometer |
| C. | troptometer |
| D. | tropometer |
| Answer» C. troptometer | |
| Explanation: troptometer is an instrument which is used for measuring the angular distortion of the material. mocrometer and vernier callipers are used to measure length. tropometer measures amount of torsion for a bone. | |
| 37. |
Torsional stress multiplied with original cross sectional are is: |
| A. | maximum twisting load |
| B. | minimum twisting load |
| C. | minimum shear load |
| D. | yield shear load |
| Answer» A. maximum twisting load | |
| Explanation: torsional stress is given by the ratio of maximum twisting load and original are of cross section of the material. therefore, torsional stress multiplied with original cross sectional gives us maximum twisting load. | |
| 38. |
Plastic deformation can only occur in case of torsional force. |
| A. | true |
| B. | false |
| C. | topic 1.4 torsional stress and deformations |
| Answer» B. false | |
| Explanation: the above given statement is false as plastic deformation can occur in case of tensile, compressive and torsional load after a point. after this point, the body cannot recover its original shape. | |
| 39. |
What is the unit of polar moment of inertia? |
| A. | m2 |
| B. | m5 |
| C. | m3 |
| D. | m4 |
| Answer» D. m4 | |
| Explanation: polar moment of inertia denoted by j, is given by integration of radius square with respect to small area of cross- | |
| 40. |
Torque is moment. |
| A. | twisting |
| B. | shear |
| C. | bending |
| D. | couple |
| Answer» A. twisting | |
| Explanation: a cylindrical shaft is subjected to twisting moment or torque when a force is acting on the member tangentially at some radius in a plane of its cross section. | |
| 41. |
Shear stress on a solid bar and hollow bar is same for given dimension. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: shear stress for a hollow bar and a solid bar are different dimensions as the hollow bar has two dimensions, outer and inner radius because of which calculation is different than the solid bar which has only one diameter. | |
| 42. |
In which of the following the angle of twist increases fast for a small amount of torque? |
| A. | cold working condition |
| B. | hot working condition |
| C. | warm working condition |
| D. | the increase is the same for cold working, hot working and warm working |
| Answer» B. hot working condition | |
| Explanation: when the torsion test is conducted in hot working, it is observed that for a slight change in torque on the given specimen the angle of twist increase fast as | |
| 43. |
Torsion is denoted by |
| A. | r |
| B. | q |
| C. | t |
| D. | n |
| Answer» C. t | |
| Explanation: if the moment is applied in a plane perpendicular to the longitudinal axis of the beam (or) shaft it will be subjected to torsion. torsion is represented or denoted by t. | |
| 44. |
The SI units for torsion is |
| A. | n m |
| B. | n |
| C. | n/m |
| D. | m |
| Answer» A. n m | |
| Explanation: as torsion is a product of perpendicular force and radius, the units will be n m. | |
| 45. |
torsion is produced when twisting couple coincides with the axis of the shaft. |
| A. | exact |
| B. | pure |
| C. | nominal |
| D. | mild |
| Answer» B. pure | |
| Explanation: when a member is subjected to the equal and opposite twisting moment at its ends, then the member is said to be subjected under pure torsion. pure torsion is often produced when the axis of the twisting couple coincides with the axis of the shaft. | |
| 46. |
Which of the following is known as Re- entrant mouthpiece? |
| A. | external mouthpiece |
| B. | convergent mouthpiece |
| C. | internal mouthpiece |
| D. | cylindrical mouthpiece |
| Answer» C. internal mouthpiece | |
| Explanation: according to the position, mouthpieces are classified as an external mouthpiece and internal mouthpiece. if the tube projects inside the tank, it is called an internal mouthpiece or re-entrant or borda’s | |
| 47. |
What is the general value for coefficient of contraction? |
| A. | 0.64 |
| B. | 0.67 |
| C. | 0.66 |
| D. | 0.7 |
| Answer» A. 0.64 | |
| Explanation: the ratio of the area of a jet at vena contracta to the area of orifice is known as the coefficient of contraction. the value of cc varies from 0.61 to 0.69 for different orifices. generally, for sharp edged orifice the value of cc may be taken as 0. 64. | |
| 48. |
The Cd value for internal mouthpiece running free is |
| A. | 0.6 |
| B. | 0.5 |
| C. | 0.7 |
| D. | 0.8 |
| Answer» B. 0.5 | |
| Explanation: the cd value for internal mouthpiece running free is 0.5. | |
| 49. |
is the velocity with which water reaches the notch or before it flows over it. |
| A. | velocity of contact |
| B. | velocity of moment |
| C. | velocity of approach |
| D. | velocity of head |
| Answer» C. velocity of approach | |
| Explanation: the velocity of approach is defined as the velocity with which water reaches the notch or weir before it flows over it. this velocity of approach creates an additional head “ha” equal to va2 / 2g and effect head over the notch is increased to h+ha. | |
| 50. |
Which of the following is also known as V notch? |
| A. | trapezoidal |
| B. | stepped |
| C. | triangular |
| D. | sharp edged |
| Answer» C. triangular | |
| Explanation: a triangular notch also called a v notch is of triangle shape with apex down. the expression of the discharge over triangular notch or weir is q = 8/15 cd (2g) 1/2 × h 5/2. | |
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