If two unequal rolling loads of unequal weight roll along a beam, the maximum bending moment will occur

A.Under heavy load
B.Under light load when centre of the beam bisects the distance between the resultant of the loads and light wheel
C.Under heavy load when the centre of the beam oisects the distance between the resultant of the loads and ligh wheel
D.Under heavy load when the centre of the load is at the centre of beam
E.Under heavy load when the centre of the lighy load is at the centre of the beam.

Tensile stress is

A.Stress due to any force
B.Stress due to change in length under a load
C.Stress caused by varying load
D.Stress measured by the ratio of the increase or decrease in length of the unloaded piece
E.Stress measured by the ratio of the increase or decrease in length of the unloaded piece under tensile force