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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 24

Q1 | any sudden change in cross section leads to the formaiton of area
  • stiff
  • stres concentratio n
  • any one ofabove
  • none of theabove
Q2 | the graphical representation of results of tensile test is known as                   
  • stress straincurve
  • s-n curve
  • creep curve
  • none of theabove
Q3 | in engineering stress we consider                  
  • original crosssection
  • instantaneou s cross section
  • cross section after the test
  • none of theabove
Q4 | during the tensile test, the length of specimen and its cross section area
  • increases, increases
  • decreases, increases
  • increases, decreases
  • decreases, decreases
Q5 | the test which come under the group of destructive tests is                        
  • dye penetrant test
  • ultrasonictest
  • eddy currenttest
  • none of theabove
Q6 | the tests which come under the group of destructive tests are                    
  • tensile and compressive test
  • shear and bend test
  • impact and fatigue test
  • any one ofabove
Q7 | the material which does not show the predefined yield stress, the yield stress can be determined by                        
  • prone stress method
  • proof stress method
  • any one ofabove
  • none of theabove
Q8 | the relation between true stress and engineering stress is                               
  • σe=σt(1+e)
  • σt=σe(1+e)
  • σt=σe(1-e)
  • σe=2σt(1+e)
Q9 | the relation between true strain and engineering strain is                           
  • e=ln(1+et)
  • et=ln(1+2e)
  • et=ln(1-2e)
  • et=ln(1+e)
Q10 | in tensile stress, necking occurs at a pointwhere                 
  • (dσt/det) =et
  • (det/dσt) =σt
  • (det/dσt) =et
  • (dσt/det) =σt
Q11 |                    property is not directly shown onthe stress strain curve
  • ductility
  • malleability
  • stiffness
  • all of the above
Q12 |                  is maximum value of stress upto which stress is directly proportional to strain
  • elastic limit
  • proportionallimit
  • yield stress
  • all of the above
Q13 |                is the stress at which material shows a specified amount of plastic deformation
  • yirld pointstress
  • proportionallimit
  • proof stress
  • ultimate tensile stress
Q14 | to calclulate proof stress, method isused
  • offset
  • bending
  • shear
  • all of the above
Q15 | for calculating a proof stress, a parallel line isdrawn at                 
  • 0.1% of yield elongation
  • 0.2% of total elongation
  • 0.2% of yield elongation
  • 0.1% of total elongation
Q16 |              is the maximum value of stress in theplastic region
  • uts
  • proof stress
  • yield stress
  • proportionalstress
Q17 | for ducttile material is the maximum value of stress the material can sustain
  • uts
  • proof stress
  • yield stress
  • proportionalstress
Q18 | Breaking Stress is also called as                      
  • proof stress
  • yield stress
  • fracture stress
  • uts
Q19 |                      is the minimum value of stress inplastic region
  • uts
  • proof stress
  • yield stress
  • breaking stress
Q20 | unit of toughness is                   
  • pascal
  • joule
  • newton
  • watts
Q21 | for brittle material its                       
  • yield stress and utsare very close
  • uts and breaking are very close
  • yield stress and uts and breaking are very close
  • none of theabove
Q22 | in tensile test, during strain hardening material after cold working shows                     in strength with decreased toughness
  • decrease
  • increase
  • no change
  • none of theabove
Q23 | during tensile test, if gauge length                   percentage elongation increases due to localised elongation
  • decreases
  • increases
  • same
  • all of the above
Q24 |                states that geometrically similar samples having constant L/D ratio shows same % elongation
  • hooke\s law
  • barba\s law
  • newton\slaw
  • none of theabove
Q25 | during tensile test, type of loadingshould be avoided
  • shear
  • eccentric
  • repetitive
  • all of the above