MCQOPTIONS
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MCQOPTIONS
This section includes 398 Mcqs, each offering curated multiple-choice questions to sharpen your Strength of Materials knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The ratio of maximum shear stress to average shear stress in case of a circular beam transmitting power is equal to |
| A. | 3?4 |
| B. | 5?4 |
| C. | 2?5 |
| D. | 4?3 |
| E. | 4?5 |
| Answer» E. 4?5 | |
| 102. |
When a strip made of iron and copper is heated |
| A. | It bends |
| B. | It gets twisted |
| C. | Iron bends on convex side |
| D. | Iron bends on concave side |
| E. | None of the above |
| Answer» E. None of the above | |
| 103. |
Two bars of sifferent materials are of the same size and are subjected to same tensile forces. If the bars have unit elongation in the ratio of 7 : 3, then the ratio of modulii of elasticity of the two materials is |
| A. | 8 ; 3 |
| B. | 3 ; 8 |
| C. | 64 ; 9 |
| D. | 9 ; 64 |
| E. | None of the above |
| Answer» B. 3 ; 8 | |
| 104. |
Clad metals are |
| A. | Non-ferrous materials |
| B. | Two or more dissimilar materials riveted together |
| C. | Two or more dissimilar materials joined together by welding |
| D. | Two or more dissimilar materials jointed together under very high hydraulic pressure |
| E. | None of the above |
| Answer» E. None of the above | |
| 105. |
Necking in case of ductile materials begins at the |
| A. | elastic limit point |
| B. | upper yield point |
| C. | lower yield point |
| D. | ultimate point |
| E. | None of the above |
| Answer» E. None of the above | |
| 106. |
According to Rankine's theory of failure, elastic failure occurs |
| A. | When the minor principal stress is equal to the elastic limits value in a simple tension test |
| B. | When the greatest principal stress reaches the elastic limit value in simple tension test |
| C. | When the greatest principal stress is equal to the stress corresponding to the upper yield limit in a tension test |
| D. | None of the above |
| E. | None of the above |
| Answer» C. When the greatest principal stress is equal to the stress corresponding to the upper yield limit in a tension test | |
| 107. |
The maximum strains at the end of plastic range of structural steel is about |
| A. | 0.11 percent |
| B. | 1.5 percent |
| C. | 11 percent |
| D. | 15 percent |
| E. | None of the above |
| Answer» C. 11 percent | |
| 108. |
The deformation of any structure takes place in such a manner that the work of deformation is a minimum. This is known as |
| A. | Principle of least work |
| B. | Law of minimum energy |
| C. | Law of conservation of energy |
| D. | Principle of failure of structure |
| E. | None of the above |
| Answer» B. Law of minimum energy | |
| 109. |
The numerical value of Young's modulus of elasticity in ascending order for glass, aluminium, copper, wrought iron and tungsten are given by |
| A. | Glass, aluminium, copper, wrought, iron, tungsten |
| B. | Aluminium, glass, copper, wrought, iron, tungsten |
| C. | Wrought iron, copper, aluminium, glass, tungsten |
| D. | Tungsten, wrought, iron, copper, aluminium, glass |
| E. | Copper, aluminium, glass, tungsten, wrought iron |
| Answer» B. Aluminium, glass, copper, wrought, iron, tungsten | |
| 110. |
In case of thin walled cylinders the ratio of longitudinal stress to shear stress is |
| A. | 2 |
| B. | 4 |
| C. | None of the above |
| Answer» B. 4 | |
| 111. |
A live load is one that |
| A. | Varies continuously |
| B. | Cannot be neglected |
| C. | Has lived and is no more in existence |
| D. | Remains constant |
| E. | Varies with time |
| Answer» B. Cannot be neglected | |
| 112. |
A sheet metal 2 mm thick having a shear strength of 40 kg/cm2 is to receive a punch hole of 35 mm diameter. The force required to make the punching will be |
| A. | 12,540 kg |
| B. | 88 kg |
| C. | 4400 kg |
| D. | 2200 kg |
| E. | 17,600 kg |
| Answer» C. 4400 kg | |
| 113. |
A mild steel bolt of net cross-sectional area 8.4 sq. cm, diameter 37 will be safe to take a tensile load of about |
| A. | 75 tonnes |
| B. | 40 tonnes |
| C. | 30 tonnes |
| D. | 50 tonnes |
| E. | 60 tonnes |
| Answer» D. 50 tonnes | |
| 114. |
A cantilever beam of square section is subjected to a load W at the free end. If the length of the beam is doubled and load reduced to half, the deflection at the free end as compared to original deflection would be |
| A. | 4 times |
| B. | 2 times |
| C. | 16 times |
| D. | half |
| E. | 8 times |
| Answer» B. 2 times | |
| 115. |
A beam of uniform strength is the one in which |
| A. | B.M. is same throughout the beam |
| B. | Deflection is same throughout the length |
| C. | Bending stress is same in every section along the longitudinal axis |
| D. | Shear stress is uniform throughout the beam |
| E. | None of the above |
| Answer» D. Shear stress is uniform throughout the beam | |
| 116. |
When the deformation arising from change of temperature is presented, the stresses set up are known as |
| A. | Compressive stresses |
| B. | Tensile stresses |
| C. | Shear stresses |
| D. | Thermal stresses |
| E. | None of the above |
| Answer» E. None of the above | |
| 117. |
The ratio of bending moment at the centre of a simply supported beam of effective length L subjected to a central load W with that when the load W is uniformly distributed, will be |
| A. | 8 |
| B. | 4 |
| C. | 2 |
| D. | 1 |
| E. | None of the above |
| Answer» D. 1 | |
| 118. |
In design of a shaft, pulley and key for a system |
| A. | Shaft is the weakest member |
| B. | Pulley is the weakest member |
| C. | Key is the weakest member |
| D. | All are designed equally strong |
| E. | None of the above |
| Answer» D. All are designed equally strong | |
| 119. |
Elasticity is the property of the material due to which it can be |
| A. | draw into wires |
| B. | beaten into sheets |
| C. | drawn into thinner sections |
| D. | rolled into bars |
| E. | None of the above |
| Answer» F. | |
| 120. |
The stress at neutral axis is |
| A. | Zero |
| B. | Minimum tensile |
| C. | Maximum compressive |
| D. | Maximum tensile |
| E. | Minimum compressive |
| Answer» B. Minimum tensile | |
| 121. |
The area around the centre of gravity of a cross-section within which any load applied will produce stress of only one sign throughout the entire cross-section, is known as |
| A. | Symmetrical |
| B. | Centroid |
| C. | Kern |
| D. | Neutral zone |
| E. | Balance zone |
| Answer» D. Neutral zone | |
| 122. |
The ratio of the area under the bending moment diagram between any two points along a beam to the flexural rigidity EI gives the change to the following parameter between the two points |
| A. | deflection |
| B. | shear force |
| C. | slope |
| D. | bending moment |
| E. | None of the above |
| Answer» D. bending moment | |
| 123. |
The deformation of a steel bar under its own weight as compared to the deformation caused by a direct load equal to the weight of the shaft will be |
| A. | Double |
| B. | Four times |
| C. | Same |
| D. | Half |
| E. | One fourth |
| Answer» E. One fourth | |
| 124. |
Two shafts of the same material are subjected to the same torque. If the first shaft is of solid circular section and the second shaft is of hollow section whose internal diameter is 2/3 of the outside diameter, the ratio of weights of hollow shaft to solid shaft would be |
| A. | 1 |
| B. | Less than 0.5 |
| C. | Between 0.5 to 0.99 |
| D. | 1.5 to 2 |
| E. | 1 to 1.5 |
| Answer» D. 1.5 to 2 | |
| 125. |
An underground pipeline is laid in spring at 35?C. If the pipe is unable to contract, during winter when temperature drops to 5?C, the pipe will be under |
| A. | hoop stress |
| B. | Compressive stress |
| C. | hoop and compressive stresses |
| D. | tensile stress |
| E. | None of the above |
| Answer» E. None of the above | |
| 126. |
The ratio of Bulk modulus to shear modulus for Poisson's ratio of 0.25 will be |
| A. | 5?3 |
| B. | 3?2 |
| C. | 2?3 |
| D. | 5?6 |
| E. | 1 |
| Answer» B. 3?2 | |
| 127. |
A steel bar of 5 mm is heated from 15?C to 40?C and it is free to expand. The bar will induce |
| A. | no stress |
| B. | shear stress |
| C. | tensile stress |
| D. | compressive stress |
| Answer» B. shear stress | |
| 128. |
Strain rosetters are used tc |
| A. | measure shear strain |
| B. | measure linear strain |
| C. | measure volumetric strain |
| D. | relieve strain |
| Answer» C. measure volumetric strain | |
| 129. |
Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is double that of spring 'B'. The stiffness of spring 'A' will be |
| A. | one-sixteenth |
| B. | one-eighth |
| C. | one-fourth |
| D. | one-half |
| Answer» E. | |
| 130. |
The torsional regidity of a shaft is expressed by the torque required to produce a twist of one radian per unit length of a shaft. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 131. |
The tensile strength of ductile materials is |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» D. | |
| 132. |
In case of an under-reinforced beam, the depth of actual neutral axis is |
| A. | same as |
| B. | less than |
| C. | greater than |
| Answer» C. greater than | |
| 133. |
The thermal stress in a bar is |
| A. | directly |
| B. | indirectly |
| Answer» B. indirectly | |
| 134. |
Two closely coiled helical springs 'A' and 'B' are equal in all respects but the diameter of wire of spring 'A' is double that of spring 'B'. The stiffness of spring 'B' will be |
| A. | one-sixteenth |
| B. | one-eighth |
| C. | one-fourth |
| D. | one-half |
| Answer» B. one-eighth | |
| 135. |
The bending moment at the centre of a simply supported beam with a gradually varying load from zero at both ends to w per metre at the centre is wl / 4. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 136. |
In a simple bending theory, one of the assumption is that the plane sections before bending remain plane after bending. This assumption means that. |
| A. | stress is uniform throughout the beam |
| B. | strain is uniform throughout the beam |
| C. | stress is proportional to the distance from the neutral axis |
| D. | strain is proportional to the distance from the neutral axis |
| Answer» E. | |
| 137. |
In a beam subjected to pure bending, the intensity of stress in any fibre is |
| A. | equal to |
| B. | less than |
| C. | more than |
| D. | directly proportional to |
| Answer» E. | |
| 138. |
Which of the following materials can be used for absorption of shock? |
| A. | Rubber |
| B. | Wood |
| C. | sawdust |
| D. | Lead sheet |
| E. | Any of the above |
| Answer» F. | |
| 139. |
Two rods A and B are subjectd to equal load P. Rod A is tapering with bigger diameter D at the support and small end diameter as D/2. Rod B is of uniform cross section with diameter D. The ratio of elongation of rod A to that of B would be |
| A. | 4 |
| B. | 2 |
| C. | 1 |
| D. | None of the above |
| Answer» C. 1 | |
| 140. |
The moment of inertia of an area will be least with respect to |
| A. | Vertical axis |
| B. | Moment of area does not depend on axes |
| C. | Moment of area is same through all axes |
| D. | Central axis |
| E. | Horizontal axis |
| Answer» E. Horizontal axis | |
| 141. |
The weakness section of a diamond riveting is the section which passes through |
| A. | End row with one rivet only |
| B. | Row with maximum rivets |
| C. | All rows have same strength |
| D. | The first row |
| E. | Middle row |
| Answer» B. Row with maximum rivets | |
| 142. |
Shear stresses on mutually perpendicular planes are |
| A. | Equal |
| B. | Maximum |
| C. | Minimum |
| D. | Zero |
| E. | Unequal |
| Answer» B. Maximum | |
| 143. |
The ratio of hoop stress to longitudinal stress for thin spherical shells is |
| A. | 2 |
| B. | There is no such ratio for spherical shells |
| Answer» F. | |
| 144. |
If the slenderness ratio for a column is 100, then it is said to be a |
| A. | long |
| B. | medium |
| C. | short |
| Answer» B. medium | |
| 145. |
The web bukling in beams may be avoided by |
| A. | stiffening the web |
| B. | limiting the stress that can be used |
| C. | increasing the span |
| D. | any of the above methods |
| E. | None of the above |
| Answer» B. limiting the stress that can be used | |
| 146. |
Torsional rigidity is |
| A. | The torque that produces rotation of unit r.p.m. in a shaft |
| B. | The torque that transmits one HP at one r.p.m. |
| C. | The torque that produces a twist of one radian in a shaft of unit diameter |
| D. | The torque that produces a twist of one radian in a shaft of unit length |
| E. | None of the above |
| Answer» E. None of the above | |
| 147. |
An unknown weight falls through 1 cm on a collar rigidly attached to the lower end of a vertical bar 3 m long and 6 m2 in section. If the maximum instantaneous extension is 2 mm the value of stress would be |
| A. | 1500 kg/cm2 |
| B. | 500 kg/cm2 |
| C. | 1000 kg/cm2 |
| D. | 1333 kg/cm2 |
| E. | 667 kg/cm2 |
| Answer» E. 667 kg/cm2 | |
| 148. |
Hoop stress is |
| A. | Circumferential tensile stress |
| B. | Compressive stress |
| C. | Radial stress |
| D. | Longitudinal stress |
| E. | None of the above |
| Answer» B. Compressive stress | |
| 149. |
A beam supporting a uniformly distributed load over its entire length L is pinned at one end and passes over a roller support at a distance x from the other end. The value of x such that the greatest bending moment in the beam is as small as possible, will be |
| A. | 0.111 L |
| B. | 0.2 L |
| C. | 0.125 L |
| D. | 0.33 L |
| E. | 0.293 L |
| Answer» F. | |
| 150. |
The compression members tend to buckle in the direction of their |
| A. | Axis of load |
| B. | Perpendicular to the axis of load |
| C. | Minimum cross-section |
| D. | Least radius of gyration |
| E. | None of the above |
| Answer» E. None of the above | |