Correct Answer - Option 3 : 5 tonnes/cm
2
Concept:
Ultimate tensile strength is corresponding to the maximum load and cross-sectional area of the specimen at the start of the test.
Ultimate tensile strength = \(\frac{{maximum\;load}}{{original\;cross - sectional\;area}}\)
Calculation:
Given:
Area = 1 cm2 and maximum load = 5 tonnes
So ultimate tensile strength =
\(\frac{{5\;tonnes}}{{1\;c{m^2}}}\) = 5 tonnes/cm
2