Mechanical Engineering MCQs

Page No. 129

If the radius of wire stretched by a load is doubled, then its Young’s modulus will be_______________?


adoubled

✖


bhalved

✖


cbecome four times

✖


dremain unaffected

✓


View Answer remain unaffected

Tensile strength of a material is obtained by dividing the maximum load during the test by the_________________?


aarea at the time of fracture

✖


boriginal cross-sectional area

✓


caverage of A. and B.

✖


dminimum area after fracture

✖



The Young’s modulus of a wire is defined as the stress which will increase the length of wire compared to its original length________________?


ahalf

✖


bsame amount

✓


cdouble

✖


done-fourth

✖


View Answer same amount

The intensity of stress which causes unit strain is called_______________?


aunit stress

✖


bbulk modulus

✖


cmodulus of rigidity

✖


dmodulus of elasticity

✓


View Answer modulus of elasticity

During a tensile test on a specimen of 1 cm 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___________________?


a4 tonnes/cm2

✖


b8 tonnes/cm2

✓


c16 tonnes/cm2

✖


d22 tonnes/cm2

✖


View Answer 8 tonnes/cm2

Which of the following has no unit __________________?


akinematic viscosity

✖


bsurface tension

✖


cbulk modulus

✖


dstrain

✓


View Answer strain

In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is_________________?


amore

✖


bless

✓


csame

✖


dmore/less depending on composition

✖


View Answer less

Which of the following materials is most elastic_________________?


arubber

✖


bplastic

✖


cbrass

✖


dsteel

✓


View Answer steel

The value of Poisson’s ratio for steel is between_________________?


a0.01 to 0.1

✖


b0.23 to 0.27

✖


c0.25 to 0.33

✓


d0.4 to 0.6

✖


View Answer 0.25 to 0.33

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________________?


aof same magnitude as that of bar and applied at the lower end

✖


bhalf the weight of bar applied at lower end

✓


chalf of the square of weight of bar applied at lower end

✖


done-fourth of weight of bar applied at lower end

✖



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