# SOM Unit-1 Simple Stresses and Strain

Updated on 2019/03/21 09:25

 QUESTIONStrain is defined as the ratio of  Change in volume to original volumeChange in length to original lengthChange in cross-sectional area to original cross- sectional areaAny one of above Show ! Answer: D
 QUESTION Young's modulus is defined as the ratio of  Volumetric stress and volumetric strainLateral stress ans lateral strainLongitudinal stress and longitudinal strainShear stress to shear strain Show ! Answer: C
 QUESTION The unit of Young's modulus is  mm/mmN/cmNN/cm2 Show ! Answer: D
 QUESTION Deformation per unit length in the direction of force is known as  StrainLateral strainLinear strainLinear stress Show ! Answer: C
 QUESTION In equal and opposite forces applied to a body tends to elongate it the stress so produced is called  Internal resistanceTensile stressTransverse stressWorking stress Show ! Answer: B
 QUESTION The materials having same elastic properties in all the direction is called  Ideal materialUniform materialIsotropic MaterialPractical material Show ! Answer: C
 QUESTION Modulus of rigidity is defined as the ratio of  Longitudinal stress and longitudinal strainVolumetric stress and volumetric strainLateral stress and lateral strainShear stress and shear strain Show ! Answer: D
 QUESTION The ultimate tensile stress of mild steel compared to ultimate compressive stress is  Samemorelessunpredictable Show ! Answer: B
 QUESTION Tensile strength of a material is obtained by dividing the maximum load during the test by the  Area at the time of fractureOriginal cross-sectional areaMinimum area after fractureNone of above Show ! Answer: B
 QUESTION The intensity of stress which causes unit strain is called  Unit stressBulk modulusModulus of rigidityModulus of elasticity Show ! Answer: D
 QUESTION Which of the following has no unit  Surface tensionBulk modulusstrainelasticity Show ! Answer: C
 QUESTION The property of material by virtue of which a body returns to its original shape after removal of the load is called  Plasticityelasticityductilitymalleability Show ! Answer: B
 QUESTION The material which exhibit the same elastic properties in all direction are called  Homogeneousinelasticisotropicisentropic Show ! Answer: C
 QUESTION The property of a material which allows it to be drawn into a smaller section is called  PlasticityDuctilityelasticitymalleability Show ! Answer: B
 QUESTION If a material is loaded beyond yield point stress  It becomes elasticIt becomes ductileIts resistance to fatigue to fatigue increasesIt loses its tendency to return its original shape Show ! Answer: D
 QUESTION A body is subjected to three mutually perpendicular stresses of equal intensity. The ratio of direct stress to corresponding volumetric strain is called  Poisson’s ratioBulk modulusModulus of rigidityModulus of elasticity Show ! Answer: B
 QUESTION A live load is one which  Remains constantVaries with timeVaries continuouslyNone of these Show ! Answer: C
 QUESTION Hook's law holds good only within  Elastic limitLimit of proportionalityLimit of yield pointNone of these Show ! Answer: B
 QUESTION Elasticity of M S specimen is defined by  Hooks lawYield pointProof stressPermanent set Show ! Answer: A
 QUESTION Poisson's ratio is defined as the ratio of  Longitudinal stress and Longitudinal strainLateral stress and Longitudinal stressLateral stress and Lateral strainNone of the above Show ! Answer: B
 QUESTION When it is indicated that a member is elastic, it means that when force is applied, it will  Not deformBe safestStretchNot stretch Show ! Answer: C
 QUESTION The ratio of lateral strain to the linear strain within elastic limit is known as  Young's modulusBulk modulusModulus of elasticityPoisson's ratio Show ! Answer: D
 QUESTION Limiting value of Poisson's ratio are  1 to -0.51 to +0.50 to +0.50 to -0.5 Show ! Answer: C
 QUESTION The modulus of elasticity for mild steel is approximately equal to  10 kN/mm280 kN/mm2100 kN/mm2210 kN/mm2 Show ! Answer: D
 QUESTION The unit of stress in S.I. units is  PaKgf/mm2Tonne/m2any one of these Show ! Answer: A
 QUESTION The tensile strength of ductile materials is  its compressive strength.  equal toless thangreater thanNearly equal to Show ! Answer: C
 QUESTION The compression test is carried on  materials.  ductilebrittlemalleableplastic Show ! Answer: B
 QUESTION Poisson’s ratio lies in the range for most metals,  0.1 to 0.90.05 to 0.11 to 100.25 to 0.35 Show ! Answer: D
 QUESTION Isotropic material behavior can be expressed using  properties are  1234 Show ! Answer: D
 QUESTION Within elastic limit stress is  Inversely proportional to strainDirectly proportional to strainSquare root of strainEqual to strain Show ! Answer: B
 QUESTION The intensity of stress which causes unit strain is called  Unit stressModulus of rigidityBulk modulusModulus of elasticity Show ! Answer: D
 QUESTION A material obeys Hook’s law up to  Plastic limitElastic limitYield pointLimit of proportionality Show ! Answer: B
 QUESTION In a stress strain curve of mild steel there is a point at which there is increase in strain with no increase in stress. This point is called  point of failurepoint of ruptureyield pointnone of these Show ! Answer: C
 QUESTION The region in the stress-strain curve extending from origin to proportional limit is called  plastic rangeelastic rangesemi plastic rangesemi elastic range Show ! Answer: B
 QUESTION Deformation of a bar under its own weight as compared to that when subjected to a direct axial load equal to its own weight will be  The sameOne fourthHalfDouble Show ! Answer: C
 QUESTION A test specimen is stressed slightly beyond the yield point and then unloaded.Its yield strength will   DecreaseIncreaseRemains sameBecomes equal to ultimate tensile strength Show ! Answer: B
 QUESTION 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?  Young's modulusShear modulusPoisson’s ratioBoth Young's modulus and shear modulus Show ! Answer: D
 QUESTION During tensile-testing of a specimen using a Universal Testing Machine, the parameters actually measured include  True stress and true strainPoisson’s ratio and Young's modulusEngineering stress and engineering strainLoad and elongation Show ! Answer: D
 QUESTION Which of the following materials generally exhibits a yield point?  Cast ironMild steelSoft brassAluminum Show ! Answer: B
 QUESTION Which one of the following properties is more sensitive to increase in strain rate?  Yield strengthProportional limitElastic limitTensile strength Show ! Answer: B
 QUESTION For a linearly elastic, isotropic and homogeneous material, the number of elastic constants required to relate stress and strain is:   TwoThreeFourSix Show ! Answer: A
 QUESTION The unit of elastic modulus is the same as those of  Stress, shear modulus and pressureStrain, shear modulus and forceShear modulus, stress and forceStress, strain and pressure Show ! Answer: A
 QUESTION In a simple tension test, Hook’s law is valid up to the  Elastic limitLimit of proportionalityUltimate stressBreaking point Show ! Answer: B
 QUESTION The percentage elongation of a material as obtained from static tension test depends upon the  Diameter of the test specimenGauge length of the specimenNature of end-grips of the testing machineGeometry of the test specimen Show ! Answer: B
 QUESTION In a bolted joint two members are connected with an axial tightening force of 2200 N. If the bolt used has metric threads of 4 mm pitch, then torque required for achieving the tightening force is:  0.7 Nm1.0 Nm1.4 Nm2.8 Nm Show ! Answer: C
 QUESTION A tensile force P is acting on a body of length L and area of cross-section A. The change in length would be  P/LAEPE/ALPL/AEAL/PE Show ! Answer: C
 QUESTION The ratio of modulus of rigidity to modulus of elasticity for a Poisson's ratio of 0.25 would be  0.50.40.31 Show ! Answer: B
 QUESTION The ratio of bulk modulus to modulus of elasticity for a Poisson's ratio of 0.25 would be  0.660.331.331 Show ! Answer: A
 QUESTION If D is the diameter of the sphere, then volumetric strain is equal to  Two times the strain of diameter1.5 times the strain of diameterthree times the strain of diameterthe strain of diameter
 QUESTION A rectangular bar when subjected to an axial pull P  Decrease in length and width and increase in thicknessDecrease in length and increase in width and thicknessIncrease in length and decrease in Width and thicknessIncrease in length, width and thickness Show ! Answer: C
 QUESTION Thermal Stress of unrestrained body will when the temperature of the body is incresead   IncreasedDecreasedRemains constantEither A or B Show ! Answer: C
 QUESTION Modulus of Elasticity E is a ratio of  Stress to strainStress to original lengthDeformation to original lengthAll of these Show ! Answer: A
 QUESTION Elongation for a taper bar with circular cross section is given by...   4PL/πEd2 d14πEd2 d1 /PL4PE/πLd2 d1None of above Show ! Answer: A
 QUESTION The maximum stress produced in a bar of tapering section is at...  Larger endSmaller endMiddleanywhere Show ! Answer: B
 QUESTION A composite section contains three different materials.The stress in all the different material will be   SameZeroDifferentNone of above Show ! Answer: C
 QUESTION A steel bar of 5 mm is heated from 15° C to 40° C and it is not free to expand. The bar will induce  no stressshear stresstensile stresscompressive stress Show ! Answer: D
 QUESTION When a bar fixed at both ends is cooled to - 5°C, it will develop  no stressshear stresstensile stresscompressive stress Show ! Answer: C
 QUESTION The stress at which the extension of the material takes place more quickly as compared to the increase in load, is called   elastic limityield pointultimate pointbreaking point Show ! Answer: B
 QUESTION The work done on a unit volume of material, as simple tensile force is gradually increased from zero to a value causing rupture, is called  modulus of elasticitymodulus of toughnessmodulus of resiliencenone of these Show ! Answer: B
 QUESTION The necking in case of ductile material begins at the  Elastic limit pointUpper yield pointLower yield pointUltimate point Show ! Answer: D
 QUESTION The temperature stress is a function of  Coefficient of linear expansion and and temperature riseTemperature rise and modulus of elasticity of the materialCoefficient of linear expansion and modulus of elasticityCoefficient of linear expansion, temperature rise and modulus of elasticity of the material Show ! Answer: D
 QUESTION If the radius of wire stretched by a load is doubled, then its Young's modulus will be  doubledremain unaffectedbecome one-fourthbecome four times Show ! Answer: B
 QUESTION Tensile strength of a material is obtained by dividing the maximum load during the test by the  area at the time of fractureoriginal cross-sectional areaaverage of (A) and (B)more or less depending on other factors Show ! Answer: B
 QUESTION Percentage reduction of area in performing tensile test on cast iron may be of the order of  50.00%0.00%10.00%20.00% Show ! Answer: B
 QUESTION True stress-strain curve for materials is plotted between  load/original cross-sectional area and change in length/original lengthload/instantaneous cross-sectional area original area and log.load/instantaneous area and instantaneous area/original areanone of the above Show ! Answer: B
 QUESTION During a tensile test on a specimen of 1 cm2 cross-section, maximum load observed was 8 kN and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is  4 kN/cm28 kN/cm216 kN/cm2None of above Show ! Answer: B
 QUESTION For steel, the ultimate strength in shear as compared to in tension is nearly  halfsameOne thirdOne Show ! Answer: A
 QUESTION The property of a material by virtue of which a body returns to its original, shape after removal of the load is called  plasticityelasticitymalleabilityductility Show ! Answer: B
 QUESTION For which material the Poisson's ratio is more than unity  steelcopperbrassnone of the above Show ! Answer: D QUESTION The property of a material by virtue of which it can be beaten or rolled into plates is called  reliabilityplasticityductilitymalleability Show ! Answer: D
 QUESTION Rupture stress is  breaking stressload at breaking point/Aload at breaking point/neck areamaximum stress Show ! Answer: C
 QUESTION Linear strain of 0.004 was observed in a steel wire when subjected to tensile pull. What will be the lateral strain if Poisson's ratio is 0.25?  -0.01+0.01+0.001-0.001 Show ! Answer: D
 QUESTION A steel bar of square cross-section (50 mm x 50 mm) and length 2 m elongates by 1 mm due to axial pull of 10 kN. If the lateral strain is 0.0002 then the change in side of the bar cross-section will be  +0.001 mm+0.01mm- 0.01 mm- 0.001 mm Show ! Answer: C
 QUESTION The change in length of a steel rod due to change in temperature depends on …  original lengthchange in temperaturecoefficient of expansionAll of theseShow ! Answer: D
 QUESTION A steel bar of diameter 50 mm is subjected to a tensile pull 10 kN which results in the diameter shrinking by 20 microns. The lateral strain in this case is …  4 x 10-42 x 10-48 x 10-44 x 10-4 Show ! Answer: A
 QUESTION An axial pull of 10 kN is applied to a mild steel bar of section area 200 sq mm. The normal stress induced will be …  50 Pa500 Pa50 MPa500 MPa Show ! Answer: C
 QUESTION A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under  Uniform throughoutIncrease uniformlyFirst increase and then decreaseIncrease uniformly first and then increase rapidly Show ! Answer: D
 QUESTION If the radius of wire is stretched by a load of doubled then its Young's modulus will be  DoubledHalfBecome four timeRemain unaffected Show ! Answer: D
 QUESTION The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight  Of same magnitude as that of bar and applied at the lower endHalf of the weight of bar applied at the lower endHalf of the square of weight of bar applied at lower endNone of above Show ! Answer: B
 QUESTION The elongation produced in a tapered shaft with end diameter d1 and d2 due to tensile or compressive axial load is proportional to  D1+ d21/( d1+d2 )d1d21/( d1d2) Show ! Answer: D
 QUESTION A cylindrical bar of length L meter, after application of load it deforms by l cm. The strains in bar is  100* l/L0.1*l/L0.01*l /Ll/L Show ! Answer: C
 QUESTION A composite bar made of steel and copper is heated up. The stresses developed in steel and copper will be ...  Compressive and tensileCompressive and bendingBending and tensileTensile and compressive Show ! Answer: D
 QUESTION The extension of a circular bar tapering uniformly from diameter d1 to d2 is same as of uniform circular bar of diameter  (d1+d2)/2(d1-d2)/2√( d1d2)√(d12-d22) Show ! Answer: C
 QUESTION The temperature stress is function of 1.Co-efficient of linear expansion 2.Temperature rise 3.Modulus of elasticity.  1 and 2 only1 and 3 only2 and 3 only1, 2 and 3 only Show ! Answer: D
 QUESTION A steel bar of 40 mm × 40 mm square cross-section is subjected to an axial compressive load of 200 kN. If the length of the bar is 2 m and E = 200 GPa, the elongation of the bar will be  1.25 mm2.70 mm4.05 mm5.40 mm Show ! Answer: A
 QUESTION 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?  Young's modulusShear modulusPoisson's ratioBoth Young's modulus and shear modulus Show ! Answer: D
 QUESTION A solid uniform metal bar of diameter D and length L is hanging vertically from its upper end. The elongation of the bar due to self weight is  Proportional to L and inversely proportional to square of DProportional to L2 and inversely proportional to square of DProportional of L but independent of DProportional of U but independent of D Show ! Answer: A
 QUESTION In terms of Poisson's ratio (μ) the ratio of Young's Modulus (E) to ShearModulus (G) of elastic materials is  2(1+ μ )2(1 − μ )0.5(1+ μ )0.5(1 − μ ) Show ! Answer: A
 QUESTION The relationship between Young's modulus (E), Bulk modulus (K) and Poisson'sratio (μ) is given by  E = 3 K (1 − 2μ )K = 3 E (1 − 2μ )E = 3 K (1 − μ )K = 3 E (1 − μ ) Show ! Answer: A
 QUESTION When a beam is said to be of uniform strength, then which one of the following statements is correct?  The bending moment is the same throughout the beamThe shear stress is the same throughout the beamThe deflection is the same throughout the beamThe bending stress is the same at every section along its longitudinal axis Show ! Answer: D
 QUESTION If the value of Poisson's ratio is zero, then it means that  The material is rigidThe material is perfectly plasticThere is no longitudinal strain in the materialThe longitudinal strain in the material is infinite Show ! Answer: A
 QUESTION Which of the following pairs are correctly matched?Resilience ....... Resistance to deformation. 2. Malleability ..... Shape change. 3. Creep ............ Progressive deformation. 4. Plasticity ....... Permanent deformation.  2, 3 and 4 1, 2 and 3 1, 2 and 4 1, 3 and 4 Show ! Answer: A
 QUESTION E, G, K and μ represent the elastic modulus, shear modulus, bulk modulus andPoisson's ratio respectively of a linearly elastic, isotropic and homogeneous material. To express the stress-strain relations completely for this material, at least  E, G and μ must be knownE, K and μ must be knownAny two of the four must be knownAll the four must be known Show ! Answer: C
 QUESTION A taper bar of length l with diameter D at base and having specific weight w is suspended freely under its own weight. The elongation of bar will be  wl3 /6Ewl3 /Ewl3 /4Ewl3 /3E Show ! Answer: A
 QUESTION The change in the unit volume of a material under tension with increase in its Poisson's ratio will  IncreaseDecreaseRemain sameIncrease initially and then Decrease Show ! Answer: B
 QUESTION The value of Young's modulus E in terms of Shear modulus G and Bulk modulus K is  9KG/(K+G)9KG/(G+K)9KG/(K+3G)None of the above Show ! Answer: B
 QUESTION A conical bar of diameter D, axial length L, weight density w is placed vertically. If Young's modulus of the material is E , then change in its axial length will be  wL2/2EWL2/6EwL2/8EwL/8E Show ! Answer: B
 QUESTION The ultimate tensile stress for mild steel is  the ultimate compressive stress.  equal toless thanmore thanNearly equal to Show ! Answer: C
 QUESTION The shear modulus of most materials with respect to the modulus of elasticity is  equal to halfless than halfmore than halfnone of these Show ! Answer: B
 QUESTION A bar of length L and constant cross section(A) is hanging vertically. What would be total increase in length due to self weight(W)?  WL/AE2WL/AEWL/2AENone of these Show ! Answer: C
 QUESTION A bar of circular cross section varies uniformly from a cross section 2D to D. If extension of the bar is calculated treating it as a bar of average diameter, then the percentage error will be   10253350 Show ! Answer: A
 QUESTION A mild steel bar is in two parts having equal lengths. The area of cross section of Part I is double that of Part II. If the bar carries an axial load P, then the ratio of elongation in Part I to that in Part II will be  240.50.25 Show ! Answer: C
 QUESTION The bulk modulus of elasticity of a material is twice its modulus of rigidity. The Poisson’s ratio of the material is   1/72/73/74/7 Show ! Answer: B
 QUESTION In an experiment it is found that the bulk modulus of a material is equal to its shear modulus. The Poisson’s ratio is  0.120.250.380.5 Show ! Answer: A
 QUESTION If equal and opposite forces applied to a body tend to elongate it, the stress so produced is called  Internal resistanceTensile stressCompressive stressWorking stress. Show ! Answer: B
 QUESTION When a bar subjected to an axial pull P, it  Decrease in length and width and increase in thicknessDecrease in length and increase in width and thicknessIncrease in length and decrease in Width and thicknessIncrease in length, width and thickness Show ! Answer: C
 QUESTION A cube is subjected to three mutually perpendicular stresses σ each. If E=Young's modulus & ν =Poisson's ratio of the material, the volumetric strain in the cube is  (3σ/E)*(1+ν)(3σ/E)*(1-ν)(3σ/E)*(1+2ν)(3σ/E)*(1-2ν) Show ! Answer: D
 QUESTION The percentage reduction in the area of cross section of a cast iron member during tensile test would be  More than 50 %25-50 %10-25 %Negligible Show ! Answer: D
 QUESTION For steel, the yield strength in shear as compared to that in tension is nearly  SameHalfOne thirdDouble Show ! Answer: B
 QUESTION The Young's modulus of a wire is defined as the stress which will increase the length of the wire compared to its original length by...   HalfDoubleSameOne third Show ! Answer: C
 QUESTION The value of Poisson's ratio for cast iron is...  0.01 to 0.10.25 to 0.330.4 to 0.60.23 to 0.27 Show ! Answer: D
 QUESTION Stress increasing with time at a constsnt load is ...  CreepingYieldingBreakingNone of above Show ! Answer: A
 QUESTION   Assertion (A): Hook’s law is the constitutive law for a linear elastic material. Reason (R) : Formulation of the theory of elasticity requires the hypothesis that there exists a unique unstressed state of the body, to which the body returns whenever all the forces are removed.  Both A and R are individually true and R is the correct explanation of ABoth A and R are individually true but R is not the correct explanation of AA is true but R is falseA is false but R is true Show ! Answer: A
 QUESTIONMatch List I with List II and select the correct answer using the codes givenbelow the Lists: A. Ultimate strength    1. Internal structure B. Natural strain       2. Change of length per unit instantaneous length C. Conventional strain  3. Change of length per unit gauge length D. Stress               4. Load per unit area  A-1, B-2, C-3, D-4 A-4, B-3, C-2, D-1 A-1, B-3, C-2, D-4 A-4, B-2, C-3, D-1
 QUESTION Assertion (A): Stress-strain curves for brittle material do not exhibit yield point.Reason (R): Brittle materials fail without yielding.  Both A and R are individually true and R is the correct explanation of ABoth A and R are individually true but R is NOT the correct explanation of AA is true but R is falseA is false but R is true Show ! Answer: A
 QUESTION When a composite unit consisting of a steel rod surrounded by a cast iron tube is subjected to an axial load.Assertion (A): The ratio of normal stresses induced in both the materials is equal to the ratio of Young's moduli of respective materials.Reason (R): The composite unit of these two materials is firmly fastened together at the ends to ensure equal deformation in both the materials.   Both A and R are individually true and R is the correct explanation of ABoth A and R are individually true but R is not the correct explanation of AA is true but R is falseA is false but R is true Show ! Answer: A
 QUESTION A mild steel specimen is tested in tension up to fracture in a Universal Testing Machine. Which of the following mechanical properties of the material can be evaluated from such a test? Modulus of elasticity 2. Yield stress 3. Ductility 4. Tensile strength 5. Modulus of rigidity Select the correct answer using the code given below:  1, 3, 5 and 62, 3, 4 and 61, 2, 5 and 61, 2, 3 and 4 Show ! Answer: D
 QUESTION Which one of the following pairs is NOT correctly matched?  Uniformly distributed stress Force passed through the centroid of the cross-sectionElastic deformation  Work done by external forces during deformation is dissipated fully as heatPotential energy of strain  Body is in a state of elastic deformationHooke's law  Relation between stress and strain Show ! Answer: B
 QUESTION Two bars of same material having diameters in ratio 1:2 are subjected to tensile pull of same magnitude. The tensile stress induced will be in the ratio …  1:44:11:22:1 Show ! Answer: B
 QUESTIONAbove figure indicates ..... condition  Linear ElasticLinear plasticLinear elastic – perfectly plasticPerfect elastic – linearly plastic Show ! Answer: A
 QUESTIONAbove figure indicates ..... conditionLinear ElasticLinear plasticLinear elastic – perfectly plasticPerfect elastic – linearly plastic Show ! Answer: C
 QUESTION Above figure indicates stress strain curve for...  Cast ironMild SteelAluminumPure copper Show ! Answer: B
 QUESTIONAbove figure indicates stress strain curve for...Cast ironMild SteelAluminumPure copper Show ! Answer: C
 QUESTIONAbove figure indicates stress strain curve for ...  Cast ironMild SteelAluminumPure copper Show ! Answer: A
 QUESTION In the below figure, corresponding to point c isElastic limitUpper yield pointLower yield pointProportional limit point Show ! Answer: C
 QUESTION A bar of square cross section is subjected to an axial tensile force such that the longitudinal strain in the bar is e. If the Poisson’s ratio of the bar is 0.3 the volumetric strain in the bar will be  0.4 e0.6 e3 e1.6 e Show ! Answer: A
 QUESTION If all the dimensions of a prismatic bar of square cross section suspended freely from the ceiling of a roof are doubled then the total elongation produced by its own weight will increase  eight timesfour timesthree timestwo times Show ! Answer: B
 QUESTION A given material has Young’s modulus E, modulus of rigidity G and Poisson’s ratio 0.25.The ratio of Young’s modulus to modulus of rigidity of the material is  3.7532.51.5 Show ! Answer: C
 QUESTION A cylindrical bar of 20 mm diameter and 1 m length is subjected to a tensile test. Its longitudinal strain is 4 times that of its lateral strain. If the modulus of elasticity is 2 x 105N/mm2, then its modulus of rigidity is  8 x 106 N/mm28 x 105 N/mm20.8 x 104 N/mm20.8 x 105 N/mm2 Show ! Answer: D
 QUESTION A cylindrical bar of 20 mm diameter and 1 m length is subjected to a tensile test. Its longitudinal strain is 4 times that of its lateral strain. If the modulus of elasticity is 2 x 105N/mm2, then its modulus of rigidity is  8 x 106 N/mm28 x 105 N/mm20.8 x 104 N/mm20.8 x 105 N/mm2 Show ! Answer: D
 QUESTION A bar of uniform cross section is subject to uni-axial tension and develops a strain in the direction of the force of 1/800. Assuming m = 1/3, the change of volume per unit volume will be   1/10001/12001/24001/4800 Show ! Answer: C
 QUESTION A bar 4 cm in diameter is subjected to an axial load of 4 t. The extension of the bar over a gauge length of 20 cm is 0.03 cm. The decreases in diameter is 0.0018 cm. The Poisson’s ratio is   0.250.300.330.35 Show ! Answer: B
 QUESTION A bar 30 mm in diameter was subjected to tensile load of 54 kN and the measured extension on 300 mm gauge length was 0.112 mm and change in diameter was 0.00366 mm. Poisson’s ration will be  0.250.3260.3560.28 Show ! Answer: B
 QUESTION A mild steel bar is in two parts having equal lengths. The area of cross section of Part I is double that of Part II. If the bar carries an axial load P, then the ratio of elongation in Part I to that in Part II will be   241/21/4 Show ! Answer: C
 QUESTION A composite bar is made of strips of materials 1 and 2, each having area of cross section 50 mm2. Under an applied load of 3 kN, stress in material 1 is 20 N/mm2. If E for material 1 is 100 kN/mm2, what is the value of E for material 2.  50 kN/mm2100 kN/mm2150 kN/mm2200 kN/mm2 Show ! Answer: D
 QUESTION A round steel rod a of diameter D and length L is subjected to an axial load P. another steel bar B tapered with diameter D at one end uniformly tapering to diameter 0.4D at the other end, length L is also subjected to same axial load P. the ratio of change in length in bar A to the change in length in bar B is  2.51.60.80.4 Show ! Answer: D
 QUESTION A cube of of mild steel is subjected to principal stress p,p,p in 3 directions. The Poisson’s ratio of mild steel is 0.3. The ratio of volumetric strain to longitudinal strain in any direction is  1.21.82.43.0 Show ! Answer: D
 QUESTION A steel bar of square section tapering from 25mm X 25mm at one end to 20 mm X 20 mm at the other end is subjected to an axial force of 10 kN. The length of the bar is 1 meter and its young’s modulus is 100 kN/mm2 what is the change in the length of the bar  2 mm0.2 mm0.02 mm0.01 mm Show ! Answer: B
 QUESTION A bar 50 mm long is subjected to a tensile stress. If the change in its length is 0.025 mm and young’s modulus is 100 kN/mm2, the stress in bar is  250 N/mm2100 N/mm250 N/mm225 N/mm2 Show ! Answer: C
 QUESTION A steel bolt passes centrally through a brass tube. At the the ends washers and nuts are provided. Nuts are tightened so as to produce a compressive stress of 50 N/mm2 in brass tube. The area of cross section of brass tube and steel bolt is 500 mm2 each. Esteel = 2Ebrass.What is the stress developed in steel rod.  200 N/mm2 (tensile)200 N/mm2 (compressive)50 N/mm2 (tensile)100 N/mm2( compressive)
 QUESTION The extension of a circular bar tapering uniformly from diameter d1 at one end to diameter d2 at the other end, and subjected to an axial pull of P is  the extension of a circular bar of diameter d1 d2 subjected to the same load P.  equal toless thangreater thanSometimes less, Sometime more Show ! Answer: A
 QUESTION A specimen of 1.2 cm2 cross sectional area and a length 10 cm is tested under tension . The max load recorded by universal testing machine is 60Kn, the area at the neck 0.8cm2 the ultimate strength of the material is  750 N/mm2600 N/mm2500 N/mm2None of these Show ! Answer: C
 QUESTION During a tensile test on a specimen of 1cm2 cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2.Ultimate tensile strength of specimen is  4 tonnes/cm28 tonnes/cm216 tonnes/cm222 tonnes/cm2 Show ! Answer: B
 QUESTION A spherical ball of volume 1000 cm3 is subjected to a hydrostatic pressure of 18 N/mm2. If bulk modulus of ball is 180 N/mm2. The change in the volume the ball will be  1000 mm3100 mm310 mm35 mm3 Show ! Answer: B
 QUESTION A composite bar is made of aluminum and steel strips each of 200 mm2 area of cross section. If E steel = 3 E aluminum and stress in steel is 15 N/mm2, due to an axial load P, what is the value of P ?  12 kN6 kN4 kN2 kN Show ! Answer: C
 QUESTION A copper bar 2 cm diameter is completely encased in steel tube or inner diameter 2 cm and outer diameter 4 cm. Under an axial load, stress in a steel tube is 100 N/mm2 , If E steel = 2*E copper, what will be stress in copper bar  300 N/mm 2 100 N/mm 2 50 N/mm 2  33.33 N/mm 2
 QUESTION A composite bar of copper and steel is heated. The ratio of tensile force in steel and compressive stress in copper will be  10.5225 Show ! Answer: A
 QUESTIONFor the circular bar as shown above,if the elastic modulus and coefficient of thermal expansion for steel are 200 GPa and 11.7 × 10-6 per °C respectively and for copper 70 GPa and 21.6 × 10-6 per °C respectively and if the temperature of the rod is raised by 50°C, then the free expansion of the rod will be  1.1025 mm (Tensile)1.1025 cm (Compressive)1.1025 mm (Compressive)0.1025 mm (Tensile) Show ! Answer: C
 QUESTIONRefering the above figure if the free expansion of the stepped shaft is 1.1025 mm(Compressive) then the deflection responsible for the temperature stress induced will be ....   0.0725 mm0.7025 mm0.7025 cm1.7025 mm Show ! Answer: B
 QUESTIONIf a rigid beam of negligible weightis supported in a horizontal position by two rods of steel and aluminum, 2 m and 1 m long having values of cross – sectional areas 1 cm2 and 2 cm2 and E of 200 GPa and 100 GPa respectively and if a load P is applied as shown in the figure then for the rigid beam to remain horizontal ....  The forces on both sides should be equalThe force on aluminum rod should be twice the force on steelThe force on the steel rod should be twice the force on aluminumThe force P must be applied at the centre of the beam Show ! Answer: B
 QUESTIONFor the stepped shaft as shown in the figure if Es = 210 GN/m2 and Eb = 105 GN/m2, then the maximum normal stress in section CD will be .....   12.73 N/m212.73 MN/m12.73 MN/m212.73 KN/m2 Show ! Answer: C
 QUESTIONFor the stepped shaft as shown in the figure if Es = 210 GN/m2 and Eb = 105 GN/m2, then the maximum normal stress in section AB will be .....   88.42 N/m288.42 GN/m288.42 KN/m288.42 MN/m2 Show ! Answer: D
 QUESTIONFor the stepped shaft as shown above, if the deflections in AB, BC, CD sections are 6.3157x10-5m,1.3466x10-5m, and 1.5154x10-5m respectively, then the net elongation of the stepped shaft will be....  9.1777 x10-5 cm9.1777 x10-5m9.1777 x10-5mm9.1777 x10-3mm Show ! Answer: B
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Created by Vishal E on 2019/03/21 09:25

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