MCQOPTIONS
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MCQOPTIONS
This section includes 96 Mcqs, each offering curated multiple-choice questions to sharpen your Materials Mechanics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Which one of the following has the largest value of thermal coefficient? |
| A. | Brass |
| B. | Copper |
| C. | Steel |
| D. | Aluminium |
| Answer» E. | |
| 52. |
A composite bar of two sections of each of length 100mm, 150mm. When force is applied, all the sections causes an elongation of 0.1mm. What will the resultant strain in the bar? |
| A. | 0.0016 |
| B. | 0.00154 |
| C. | 0.00256 |
| D. | 0.0020 |
| Answer» B. 0.00154 | |
| 53. |
Which law states the when a number of loads are acting on a body, the resulting strain, according to principle of superposition, will be the algebraic sum of strains caused by individual loads? |
| A. | Hooke’s law |
| B. | Principle of superposition |
| C. | Lami’s theorem |
| D. | Strain law |
| Answer» C. Lami’s theorem | |
| 54. |
Which one of the following are true for the thermal expansion coefficient? |
| A. | αaluminium > αbrass> αcopper > αsteel |
| B. | αbrass > αaluminium > αcopper > αsteel |
| C. | αcopper > αsteel > αaluminium > αbrass |
| D. | αsteel > αaluminium > αbrass > αcopper |
| Answer» B. αbrass > αaluminium > αcopper > αsteel | |
| 55. |
A steel rod is heated from 25 to 250 degree celcius. Its coefficient of thermal expansion is 10⁻⁵ and E = 100 GN/m². if the rod is free to expand, the thermal stress developed in it is: |
| A. | 100 kN/m² |
| B. | 240 kN/m² |
| C. | Zero |
| D. | Infinity |
| Answer» D. Infinity | |
| 56. |
A composite rod is 1000mm long, its two ends are 40mm² and 30mm² in area and length are 300mm and 200mm respectively. The middle portion of the rod is 20mm² in area. If the rod is subjected to an axial tensile load of 1000N, what will be its total elongation (E = 200GPa)? |
| A. | 0.145mm |
| B. | 0.127mm |
| C. | 0.187mm |
| D. | 0.196mm |
| Answer» E. | |
| 57. |
Which test is conducted to measure the endurance limit of the material? |
| A. | Creep test |
| B. | Fatigue test |
| C. | Compression test |
| D. | Hardness test |
| Answer» C. Compression test | |
| 58. |
What will be the elongation of a bar of 1250mm² area and 90cm length when applied a force of 130kN if E = 1.05x 10⁵ N/mm²? |
| A. | 0.947mm |
| B. | 0.891mm |
| C. | 0.845mm |
| D. | 0.745mm |
| Answer» C. 0.845mm | |
| 59. |
A composite bar of two sections of equal length and equal diameter is under an axial pull of 10kN. What will be the stresses in the two sections? |
| A. | 3.18 N/mm² |
| B. | 2.21 N/mm² |
| C. | 3.45 N/mm² |
| D. | 2.14 N/mm² |
| Answer» B. 2.21 N/mm² | |
| 60. |
A cast iron T section beam is subjected to pure bending. For maximum compressive stress to be 3 times the maximum tensile stress, centre of gravity of the section from flange side is ____________ |
| A. | h/2 |
| B. | H/3 |
| C. | H/4 |
| D. | 2/3h |
| Answer» D. 2/3h | |
| 61. |
When a rectangular beam is loaded transversely, the maximum compressive stress develops on ____________ |
| A. | Bottom fibre |
| B. | Top fibre |
| C. | Neutral axis |
| D. | Every cross-section |
| Answer» C. Neutral axis | |
| 62. |
Consider two bars A and B of same material tightly secured between two unyielding walls. Coefficient of thermal expansion of bar A is more than that of B. What are the stresses induced on increasing the temperature? |
| A. | Tension in both the materials |
| B. | Tension in material A and compression in material B |
| C. | Compression in material A and tension in material B |
| D. | Compression in both the materials |
| Answer» E. | |
| 63. |
What will be the unit of compressive stress? |
| A. | N |
| B. | N/mm |
| C. | N/mm² |
| D. | Nmm |
| Answer» D. Nmm | |
| 64. |
When equal and opposite forces applied to a body, tend to elongate it, the stress so produced, is called ____________ |
| A. | Shear stress |
| B. | Compressive stress |
| C. | Tensile stress |
| D. | Transverse stress |
| Answer» D. Transverse stress | |
| 65. |
Which of the following stresses are associated with the tightening of a nut on a bolt?P. Tensile stress due to the streching of boltQ. Bending stress due to the bending of boltR. Torsional shear stress due to frictional resistance between the nut and the boltSelect the correct answer using the codes given below. |
| A. | P and Q |
| B. | P and R |
| C. | Only P |
| D. | R and Q |
| Answer» B. P and R | |
| 66. |
In a tensile test, near the elastic limit zone ____________ |
| A. | Tensile stress increases in linear proportion to the stress |
| B. | Tensile stress increases at a faster rate |
| C. | Tensile stress decreases at a faster rate |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 67. |
A tensile test was conducted on mild steel bar. The load at elastic limit was 250kN and the diameter of the steel bar was 3cm. What will be the value of stress? |
| A. | 35368 x 10⁴ N/m² |
| B. | 32463 x 10⁴ N/m² |
| C. | 35625 x 10⁴ N/m² |
| D. | 37562 x 10⁴ N/m² |
| Answer» B. 32463 x 10⁴ N/m² | |
| 68. |
For keeping the stress wholly compressive the load may be applied on a circular column anywhere within a concentric circle of diameter _____________ |
| A. | D/2 |
| B. | D/3 |
| C. | D/4 |
| D. | D/8 |
| Answer» D. D/8 | |
| 69. |
What will be the minimum diameter of a steel wire, which is used to raise a load of 4000N if the stress in the rod is not to exceed 95 MN/m²? |
| A. | 6mm |
| B. | 6.4mm |
| C. | 7mm |
| D. | 7.3mm |
| Answer» E. | |
| 70. |
The safe stress for a hollow steel column which carries an axial load of 2100 kN is 125 MN/m². if the external diameter of the column is 30cm, what will be the internal diameter? |
| A. | 25 cm |
| B. | 26.19cm |
| C. | 30.14 cm |
| D. | 27.9 cm |
| Answer» C. 30.14 cm | |
| 71. |
On bending of a beam, which is the layer which is neither elongated nor shortened? |
| A. | Axis of load |
| B. | Neutral axis |
| C. | Center of gravity |
| D. | None of the mentioned |
| Answer» C. Center of gravity | |
| 72. |
The transverse shear stress acting in a beam of rectangular cross-section, subjected to a transverse shear load, is ____________ |
| A. | variable with maximum at the bottom of the beam |
| B. | Variable with maximum at the top of the beam |
| C. | Uniform |
| D. | Variable with maximum on the neutral axis |
| Answer» E. | |
| 73. |
Which stress comes when there is an eccentric load applied? |
| A. | Shear stress |
| B. | Bending stress |
| C. | Tensile stress |
| D. | Thermal stress |
| Answer» C. Tensile stress | |
| 74. |
A round bar made of same material consists of 4 parts each of 100mm length having diameters of 40mm, 50mm, 60mm and 70mm, respectively. If the bar is subjected to an axial load of 10kN, what will be the total elongation of the bar in mm? |
| A. | 0.4/πE ( 1/16 + 1/25 + 1/36 + 1/49) |
| B. | 4/πE ( 1/16 + 1/25 + 1/36 + 1/49) |
| C. | 2/πE ( 1/16 + 1/25 + 1/36 + 1/49) |
| D. | 40/πE ( 1/16 + 1/25 + 1/36 + 1/49) |
| Answer» E. | |
| 75. |
If a bar of sections of two different length and different diameters are in a line and P load is acting axially on them then what will be the change in length of the bar? |
| A. | P/E x (L₁ + L₂) |
| B. | P/E x (A₁/L₁ + A₂/ L₂) |
| C. | P/E x (L₁/A₁ + L₂/A₂) |
| D. | E/P x (L₁/A₁ + L₂/A₂) |
| Answer» D. E/P x (L₁/A₁ + L₂/A₂) | |
| 76. |
A member ABCD is subjected to points load P₁=45kN, P₂, P₃=450kN and P₄=130kN. what will be the value of P necessary for equilibrium? |
| A. | 350kN |
| B. | 365kN |
| C. | 375kN |
| D. | 400kN |
| Answer» C. 375kN | |
| 77. |
What is the factor of safety? |
| A. | The ratio of total stress to the permissible stress |
| B. | The ratio of ultimate stress to the permissible stress |
| C. | The ratio of ultimate stress to the applied stress |
| D. | The ratio of ultimate stress to the modulus of elasticity |
| Answer» C. The ratio of ultimate stress to the applied stress | |
| 78. |
A block 100mm x 100mm base and 10mm height. What will the direct shear stress in the element when a tangential force of 10kN is applied to the upper edge to a displacement 1mm relative to lower face? |
| A. | 1Pa |
| B. | 1MPa |
| C. | 10MPa |
| D. | 100Pa |
| Answer» C. 10MPa | |
| 79. |
The phenomenon of slow growth of strain under a steady tensile stress is called ____________ |
| A. | Yielding |
| B. | Creeping |
| C. | Breaking |
| D. | None of the mentioned |
| Answer» C. Breaking | |
| 80. |
Stress in a beam due to simple bending is ____________ |
| A. | Directly proportional |
| B. | Inversely proportional |
| C. | Curvilinearly related |
| D. | None of the mentioned |
| Answer» B. Inversely proportional | |
| 81. |
The bending stress is ____________ |
| A. | Directly proportional to the distance of layer from the neutral layer |
| B. | Inversely proportional to the distance of layer from the neutral layer |
| C. | Directly proportional to the neutral layer |
| D. | Does not depend on the distance of layer from the neutral layer |
| Answer» B. Inversely proportional to the distance of layer from the neutral layer | |
| 82. |
What is the process in which the metal is cooled rapidly in water after heating the metal above the lower critical temperature to increase the hardness of the material? |
| A. | Quenching |
| B. | Tampering |
| C. | Hardening |
| D. | Annealing |
| Answer» B. Tampering | |
| 83. |
The thermal stress is a function of _____________P. Coefficient of linear expansionQ. Modulus of elasticityR. Temperature rise |
| A. | P and Q |
| B. | Q and R |
| C. | Only P |
| D. | Only R |
| Answer» E. | |
| 84. |
A rod of two sections of area 625mm² and 2500mm² of length 120cm and 60cm respectively. If the load applied is 45kN then what will be the elongation (E = 2.1x 10⁵ N/mm²)? |
| A. | 0.462mm |
| B. | 0.521mm |
| C. | 0.365mm |
| D. | 0.514mm |
| Answer» B. 0.521mm | |
| 85. |
A bar having two sections of cross sectional area of 100mm² and 200mm² respectively. The length of both the sections is 200mm. What will be the total strain in the bar if it is subjected to axial force of 100kN and E = 10⁵ N/mm²? |
| A. | 0.010 |
| B. | 0.015 |
| C. | 0.020 |
| D. | 0.030 |
| Answer» C. 0.020 | |
| 86. |
A diagram which shows the variations of the axial load for all sections of the pan of a beam is called ____________ |
| A. | Bending moment diagram |
| B. | Shear force diagram |
| C. | Thrust diagram |
| D. | Stress diagram |
| Answer» E. | |
| 87. |
The stress induced in a body, when subjected to two equal and opposite forces which are acting tangentially across the resisting section resulting the shearing of the body across its section is called ____________ |
| A. | Bending stress |
| B. | Compressive stress |
| C. | Shear strain |
| D. | Shear stress |
| Answer» E. | |
| 88. |
Which of the following stresses are associated with the tightening of a nut on a bolt?P. Crushing and shear stress in threadsQ. Bending stress due to the bending of boltR. Torsional shear stress due to frictional resistance between the nut and the boltSelect the correct answer using the codes given below: |
| A. | P and Q |
| B. | P and R |
| C. | Only P |
| D. | Only R |
| Answer» B. P and R | |
| 89. |
A material has a Poisson’s ratio of 0.5. If uniform pressure of 300GPa is applied to that material, What will be the volumetric strain of it? |
| A. | 0.50 |
| B. | 0.20 |
| C. | 0.25 |
| D. | Zero |
| Answer» E. | |
| 90. |
In a body loaded under plane stress conditions, what is the number of independent stress components? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 6 |
| Answer» D. 6 | |
| 91. |
If a bar of large length when held vertically and subjected to a load at its lower end, its won-weight produces additional stress. The maximum stress will be ____________ |
| A. | At the lower cross-section |
| B. | At the built-in upper cross-section |
| C. | At the central cross-section |
| D. | At every point of the bar |
| Answer» C. At the central cross-section | |
| 92. |
An axial pull of 20 kN on a bar of two equal lengths of 20cm as shown with their respective dimensions. What will be the total extension of the bar if the young’s modulus = 2×10⁵ ? |
| A. | 0.200mm |
| B. | 0.345mm |
| C. | 0.509mm |
| D. | 0.486mm |
| Answer» D. 0.486mm | |
| 93. |
An axial pull of 35000 N on a bar consisting of two lengths as shown with their respective dimensions. What will be the total extension of the bar if the young’s modulus = 2.1 x 10⁵ ? |
| A. | 0.153mm |
| B. | 0.183mm |
| C. | 0.197mm |
| D. | 0.188mm |
| Answer» C. 0.197mm | |
| 94. |
Match the following and give the correct code given in options: |
| A. | A – 1 B – 2 C – 4 |
| B. | A – 1 B – 4 C – 2 |
| C. | A – 3 B – 1 C – 2 |
| D. | A – 3 B – 4 C – 1 |
| Answer» E. | |
| 95. |
An axial pull of 35000 N is acting on a bar consisting of two lengths as shown with their respective dimensions. What will be the stresses in the two sections respectively in N/mm² ? |
| A. | 111.408 and 49.5146 |
| B. | 111.408 and 17.85 |
| C. | 97.465 and 49.5146 |
| D. | 97.465 and 34.263 |
| Answer» B. 111.408 and 17.85 | |
| 96. |
An axial pull of 1kN is acting on a bar of consisting two equal lengths as shown but of dia 10cm and 20cm respectively. What will be the stresses in the two sections respectively in N/mm² ? |
| A. | 0.127 and 0.0031 |
| B. | 0.034 and 0.0045 |
| C. | 0.153 and 0.003 |
| D. | 0.124 and 0.124 |
| Answer» B. 0.034 and 0.0045 | |