Correct Answer - Option 2 : 700 Mpa
Explanation
Important tests for rails
a) Falling height test
b) Tensile test
c) Hammer test
Tensile Test
A test specimen is taken from the head of the rail section and subjected to the tensile test. The tensile strength of the rail should not be less than 72 kg/mm2 = 706.32 N/mm2 = 706 MPa, with a minimum elongation of 14% for medium manganese rails and 12 % for carbon quality rails.
So the closest option is (b)