MCQOPTIONS
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MCQOPTIONS
This section includes 427 Mcqs, each offering curated multiple-choice questions to sharpen your Materials Science knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
E, G, K and μ elastic modulus, shear modulus, bulk modulus and Poisson’s ratio respectively. To express the stress strain relations completely for this material, at least __________ |
| A. | E, G and μ must be known |
| B. | E, K and μ must be known |
| C. | Any two of the four must be known |
| D. | All the four must be known |
| Answer» D. All the four must be known | |
| 352. |
What is the relationship between modulus of elasticity and modulus of rigidity? |
| A. | C = E / 2(1 + μ) |
| B. | C = E / (1 + μ) |
| C. | C = 2E / (1 + μ) |
| D. | C = 2E / 2(1 + μ) |
| Answer» D. C = 2E / 2(1 + μ) | |
| 353. |
If the material has identical elastic properties in all directions, it is called ____________ |
| A. | Elastic |
| B. | Isotropic |
| C. | Plastic |
| D. | Homogeneous |
| Answer» C. Plastic | |
| 354. |
Why is the strain the fundamental property but not the stress? |
| A. | Because it is dimensionless |
| B. | Because it is a ratio |
| C. | Because it’s value is calculated in the laboratory |
| D. | No stress is the fundamental property |
| Answer» D. No stress is the fundamental property | |
| 355. |
What will be the approximate value of shear modulus of a material if the modulus of elasticity is 189.8 GN/m² and its Poissons ratio is 0.30? |
| A. | 73 GN/m² |
| B. | 80 GN/m² |
| C. | 93.3 GN/m² |
| D. | 103.9 GN/m² |
| Answer» B. 80 GN/m² | |
| 356. |
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» B. Plasticity | |
| 357. |
A tensile test was conducted on a steel bar. The gauge length of the bar was 10cm and the extension was 2mm. What will be the percentage elongation? |
| A. | 0.002 |
| B. | 0.02 |
| C. | 0.2 |
| D. | 2 |
| Answer» E. | |
| 358. |
The lateral strain is ___________ |
| A. | The ratio of axial deformation to the original length |
| B. | The ratio of deformation in area to the original area |
| C. | The strain at right angles to the direction of applied load |
| D. | The ratio of length of body to the tensile force applied on it |
| Answer» D. The ratio of length of body to the tensile force applied on it | |
| 359. |
Which of the following is not the unit of distance? |
| A. | Angstrom |
| B. | Light year |
| C. | Micron |
| D. | Milestone |
| Answer» E. | |
| 360. |
A rod 200cm long is subjected to an axial pull due to which it elongates about 2mm. Calculate the amount of strain? |
| A. | 0.001 |
| B. | 0.01 |
| C. | 0.02 |
| D. | 0.002 |
| Answer» B. 0.01 | |
| 361. |
Find the strain of a brass rod of length 100mm which is subjected to a tensile load of 50kN when the extension of rod is equal to 0.1mm? |
| A. | 0.01 |
| B. | 0.001 |
| C. | 0.05 |
| D. | 0.005 |
| Answer» C. 0.05 | |
| 362. |
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» C. Ductility | |
| 363. |
A bar of 40mm dia and 40cm length is subjected to an axial load of 100 kN. It elongates by 0.005mm. Calculate the Poissons ratio of the material of bar? |
| A. | 0.25 |
| B. | 0.28 |
| C. | 0.30 |
| D. | 0.33 |
| Answer» E. | |
| 364. |
The materials which have the same elastic properties in all directions are called __________ |
| A. | Isotropic |
| B. | Brittle |
| C. | Homogeneous |
| D. | Hard |
| Answer» B. Brittle | |
| 365. |
A rod of length L and diameter D is subjected to a tensile load P. Which of the following is sufficient to calculate the resulting change in diameter? |
| A. | Youngs modulus |
| B. | Poissons ratio |
| C. | Shear modulus |
| D. | Both Youngs modulus and shear modulus |
| Answer» B. Poissons ratio | |
| 366. |
The law which states that within elastic limits strain produced is proportional to the stress producing it is known as _____________ |
| A. | Bernoulli’s law |
| B. | Hooke’s law |
| C. | Stress law |
| D. | Poisson’s law |
| Answer» C. Stress law | |
| 367. |
A circular rod of dia 30 mm and length 200mm is extended to 0.09mm length and 0.0045 diameters through a tensile force. What will be its Poissons ratio? |
| A. | 0.30 |
| B. | 0.31 |
| C. | 0.32 |
| D. | 0.33 |
| Answer» E. | |
| 368. |
Some structural members subjected to a long time sustained loads deform progressively with time especially at elevated temperatures. What is such a phenomenon called? |
| A. | Fatigue |
| B. | Creep |
| C. | Creep relaxation |
| D. | Fracture |
| Answer» C. Creep relaxation | |
| 369. |
Which one of the following pairs is NOT correctly matched? |
| A. | Visco-elastic – small plastic zone |
| B. | Orthotropic material – different properties in three perpendicular directions |
| C. | Strain hardening material – stiffening effect felt at some stage |
| D. | Isotropic material – same physical property in all directions at a point |
| Answer» B. Orthotropic material – different properties in three perpendicular directions | |
| 370. |
Find the strain of a brass rod of length 250mm which is subjected to a tensile load of 50kN when the extension of rod is equal to 0.3mm? |
| A. | 0.025 |
| B. | 0.0012 |
| C. | 0.0046 |
| D. | 0.0014 |
| Answer» C. 0.0046 | |
| 371. |
Youngs modulus of elasticity and Poissons ratio of a material are 1.25 x 10² MPa and 0.34 respectively. The modulus of rigidity of the material is __________ |
| A. | 0.9469 MPa |
| B. | 0.8375 MPa |
| C. | 0.4664 MPa |
| D. | 0.4025 MPa |
| Answer» D. 0.4025 MPa | |
| 372. |
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» B. Decreases more rapidly | |
| 373. |
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» C. Deformation limit | |
| 374. |
What is the relationship between Youngs modulus E, modulus of rigidity C, and bulk modulus K? |
| A. | E = 9KC / (3K + C) |
| B. | E = 9KC / (9K + C) |
| C. | E = 3KC / (3K + C) |
| D. | E = 3KC / (9K + C) |
| Answer» B. E = 9KC / (9K + C) | |
| 375. |
If E,G and K have their usual meanings, for an elastic material, then which one of the following be possibly true? |
| A. | G = 2K |
| B. | G = K |
| C. | K = E |
| D. | G = E = K |
| Answer» D. G = E = K | |
| 376. |
What is the relationship between the linear elastic properties Youngs modulus, bulk modulus and rigidity modulus? |
| A. | 1/E = 9/k + 3/G |
| B. | 9/E = 3/K + 1/G |
| C. | 3/E = 9/K + 1/G |
| D. | 9/E = 1/K + 3/G |
| Answer» E. | |
| 377. |
Consider the following statements: 1. Two-dimensional stresses applied to a thin plater in its own plane represent the plane stress condition. 2. Normal and shear stresses may occur simultaneously on a plane. 3. Under plane stress condition, the strain in the direction perpendicular to the plane is zero.Which of the above statements are correct? |
| A. | 2 only |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» E. | |
| 378. |
A tensile test was conducted on a mild steel bar. The diameter and the gauge length of bat was 3cm and 20cm respectively. The extension was 0.21mm. What is the value to strain? |
| A. | 0.0010 |
| B. | 0.00105 |
| C. | 0.0105 |
| D. | 0.005 |
| Answer» C. 0.0105 | |
| 379. |
i) Strain is a fundamental behaviour of a material.ii) Strain does not have a unit. |
| A. | Both i and ii are true and ii is the correct explanation of i |
| B. | Both i and ii are true but ii is not the correct explanation of i |
| C. | i is true but ii is false |
| D. | ii is true but i is false |
| Answer» C. i is true but ii is false | |
| 380. |
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» B. Elastic | |
| 381. |
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» B. Plastic modulus | |
| 382. |
What is a creep? |
| A. | Gradual increase of plastic strain with time at constant load |
| B. | Gradual increase of elastic strain with time at constant load |
| C. | Gradual increase of plastic strain with time at varying load |
| D. | Gradual increase of elastic strain with time at varying load |
| Answer» B. Gradual increase of elastic strain with time at constant load | |
| 383. |
The Youngs modulus of elasticity of a material is 2.5 times its modulus of rigidity. Then what will be its Poissons ratio? |
| A. | 0.25 |
| B. | 0.33 |
| C. | 0.50 |
| D. | 0.60 |
| Answer» B. 0.33 | |
| 384. |
What is tensile strain? |
| A. | The ratio of change in length to the original length |
| B. | The ratio of original length to the change in length |
| C. | The ratio of tensile force to the change in length |
| D. | The ratio of change in length to the tensile force applied |
| Answer» B. The ratio of original length to the change in length | |
| 385. |
For an isotropic, homogeneous and elastic material obeying Hooke’s law, the number of independent elastic constants is ____________ |
| A. | 2 |
| B. | 3 |
| C. | 9 |
| D. | 1 |
| Answer» C. 9 | |
| 386. |
What is the bulk modulus of elasticity? |
| A. | The ratio of shear stress to shear strain |
| B. | The ratio of direct stress to direct strain |
| C. | The ratio of volumetric stress to volumetric strain |
| D. | The ratio of direct stress to volumetric strain |
| Answer» E. | |
| 387. |
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» B. Upper yield point | |
| 388. |
The unit of force in S.I. units is ? |
| A. | Kilogram |
| B. | Newton |
| C. | Watt |
| D. | Dyne |
| Answer» C. Watt | |
| 389. |
A solid cube is subjected to equal normal forces on all its faces. The volumetric strain will be x-times the linear strain in any of the three axes when? |
| A. | X=1 |
| B. | X=2 |
| C. | X=3 |
| D. | X=4 |
| Answer» D. X=4 | |
| 390. |
An experiment was done and it was found that the bulk modulus of a material is equal to its shear modulus. Then what will be its Poissons ratio? |
| A. | 0.125 |
| B. | 0.150 |
| C. | 0.200 |
| D. | 0.375 |
| Answer» B. 0.150 | |
| 391. |
Which of the relationship between E, G and K is true, where E, G and K have their usual meanings? |
| A. | E = 9KC / (3K + C) |
| B. | E = 9KC / (9K + C) |
| C. | E = 3KC / (9K + C) |
| D. | E = 3KC / (3K + C) |
| Answer» B. E = 9KC / (9K + C) | |
| 392. |
What will be the value of the Poisson’s ratio if the Youngs modulus E is equal to the bulk modulus K? |
| A. | 1/2 |
| B. | 1/4 |
| C. | 1/3 |
| D. | 3/4 |
| Answer» D. 3/4 | |
| 393. |
If a material had a modulus of elasticity of 2.1 kgf/cm² and a modulus of rigidity of 0.8 kgf/cm² then what will be the approximate value of the Poissons ratio? |
| A. | 0.26 |
| B. | 0.31 |
| C. | 0.47 |
| D. | 0.43 |
| Answer» C. 0.47 | |
| 394. |
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» C. Elastic limit | |
| 395. |
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» D. None of the mentioned | |
| 396. |
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» E. | |
| 397. |
The property of a material by which it can be drawn into thin wires is? |
| A. | Malleability |
| B. | Plasticity |
| C. | Ductility |
| D. | Elasticity |
| Answer» D. Elasticity | |
| 398. |
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» D. Breaking point | |
| 399. |
What is Hooke’s law for the 1-D system? |
| A. | The relation between normal stress and the corresponding strain |
| B. | The relation between shear stress and the corresponding strain |
| C. | The relation between lateral strain and the corresponding stress |
| D. | None of the mentioned |
| Answer» B. The relation between shear stress and the corresponding strain | |
| 400. |
Limit of proportionality depends upon ____________ |
| A. | Area of cross-section |
| B. | Type of loading |
| C. | Type of material |
| D. | All of the mentioned |
| Answer» B. Type of loading | |