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___________________?

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___________________?

A. 4 tonnes/cm2
B. 8 tonnes/cm2
C. 16 tonnes/cm2
D. 22 tonnes/cm2
E. none of the above

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________________?

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________________?

A. of same magnitude as that of bar and applied at the lower end
B. half the weight of bar applied at lower end
C. half of the square of weight of bar applied at lower end
D. one-fourth of weight of bar applied at lower end
E. none of the above