MCQOPTIONS
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MCQOPTIONS
This section includes 69 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
A cylindrical metal bar of 12 mm diameter is located by an axial force of 20 kN results in a change in diameter by 0.003 mm. Poisson’s ratio is given by: (Assume modulus of rigidity = 80 GPa) |
| A. | 0.2923 |
| B. | 0.056 |
| C. | 0.025 |
| D. | 0.56 |
| Answer» B. 0.056 | |
| 52. |
If E, G and K denote Young’s modulus of elasticity, Modulus of rigidity and Bulk modulus, respectively, for an elastic material then which one of the following can be possibly true? |
| A. | G = 2K |
| B. | G = E |
| C. | K = E |
| D. | G = K = E |
| Answer» D. G = K = E | |
| 53. |
Poisson’s ratio is defined as the ratio of: |
| A. | Shear stress to share strain |
| B. | Longitudinal strain to lateral strain |
| C. | Lateral strain to longitudinal strain |
| D. | Axial stress to axial strain |
| Answer» D. Axial stress to axial strain | |
| 54. |
A material has a young’s modulus of 1.25 × 105 N/mm2 and a Poisson’s ratio of 0.25. The bulk modulus of the material will be |
| A. | 83 × 105 N/mm2 |
| B. | 0.83 × 105 N/mm2 |
| C. | 8.3 × 103 N/mm2 |
| D. | 8.3 × 105 N/mm2 |
| Answer» C. 8.3 × 103 N/mm2 | |
| 55. |
Poisson’s ratio for Aluminium is |
| A. | 0.13 |
| B. | 0.23 |
| C. | 0.33 |
| D. | 0.43 |
| Answer» D. 0.43 | |
| 56. |
If for a given material E = 2G, then the bulk modulus K will be |
| A. | E/3 |
| B. | E/2 |
| C. | E/4 |
| D. | E |
| Answer» B. E/2 | |
| 57. |
A_STRETCHED_RUBBER_HAS?$ |
| A. | Increased kinetic energy |
| B. | Increased potential energy |
| C. | Decreased kinetic energy |
| D. | Decreased potential energy |
| Answer» C. Decreased kinetic energy | |
| 58. |
Which of the following affects the elasticity of a substance? |
| A. | Hammering and annealing |
| B. | Change in temperature |
| C. | Impurity in substance |
| D. | All of the mentioned |
| Answer» E. | |
| 59. |
The_breaking_stress_of_a_wire_depends_upon$ |
| A. | Length of the wire |
| B. | Radius of the wire |
| C. | Material of the wire |
| D. | Shape of the cross-section |
| Answer» D. Shape of the cross-section | |
| 60. |
A substance breaks down by a stress of (106 N)/m2 . If the density of the material of the wire is 3√ó(103) kg/m3 , then the length of the wire of the substance which will break under its own weight when suspended vertically will be$ |
| A. | 66.6m |
| B. | 60.0m |
| C. | 33.3m |
| D. | 30.3m |
| Answer» D. 30.3m | |
| 61. |
The_diameter_of_brass_rod_is_4mm._Young’s_modulus_of_brass_is_9×109_N/m2._The_force_required_to_stretch_0.1%_of_its_length_is$ |
| A. | 360πN |
| B. | 36N |
| C. | 36π×10<sup>5</sup> N |
| D. | 144π×10<sup>3</sup>N |
| Answer» B. 36N | |
| 62. |
If in a wire of Young’s modulus Y, longitudinal strain is produced, then the value of potential energy stored in its unit volume will b?# |
| A. | YX<sup>2</sup> |
| B. | 0.5Y<sup>2</sup> X |
| C. | 2YX<sup>2</sup> |
| D. | 0.5YX<sup>2</sup> |
| Answer» E. | |
| 63. |
According to Hooke’s law of elasticity, if stress is increased, the ratio of stress to strain$ |
| A. | Increased |
| B. | Decreased |
| C. | Becomes zero |
| D. | Remains constant |
| Answer» E. | |
| 64. |
Energy stored in stretching a string per unit volume is |
| A. | 1/2√óstress√óstrain |
| B. | stress√óstrain |
| C. | Y(Strain)<sup>2</sup> |
| D. | 1/2 Y(Stress)<sup>2</sup> |
| Answer» B. stress‚Äö√†√∂‚àö‚â•strain | |
| 65. |
A cube is subjected to a uniform volume compression. If the side of the cube decreases by 2%, the bulk strain is |
| A. | 0.02 |
| B. | 0.03 |
| C. | 0.04 |
| D. | 0.06 |
| Answer» E. | |
| 66. |
There are two wires of same material and same length while the diameter of second wire is two times the diameter of first wire, then the ratio of extension the diameter of first wire, then the ratio of extension produced in the wire by applying same load will be |
| A. | 1:1 |
| B. | 2:1 |
| C. | 1:2 |
| D. | 4:1 |
| Answer» E. | |
| 67. |
The following wires are made of the same material. Which of these will have the largest extension, when the same tension is applied? |
| A. | Length = 50cm, diameter = 0.5mm |
| B. | Length = 100cm, diameter = 1mm |
| C. | Length = 200cm, diameter = 2mm |
| D. | Length = 300cm, diameter = 3mm |
| Answer» B. Length = 100cm, diameter = 1mm | |
| 68. |
Which is more elastic? |
| A. | Water |
| B. | Air |
| C. | Solid |
| D. | Crystal |
| Answer» B. Air | |
| 69. |
Amorphous solids do not melt at a sharp temperature, rather these have softening range. |
| A. | True |
| B. | False |
| Answer» B. False | |