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In a tensile testing experiment on a specimen of 1 cm2 area, the maximum load observed was 5 tonnes and neck area 0.25 cm2. The ultimate tensile strength of specimen is
1. 2.5 tonnes/cm2
2. 10 tonnes/cm2
3. 5 tonnes/cm2
4. 20 tonnes/cm2

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Correct Answer - Option 3 : 5 tonnes/cm2

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/cm2

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