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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