Q. A simply supported rolled steel joist 8 m long carries a uniformly distributed load over it span so that the maximum bending stress is 75 N/mm². If the slope at the ends is 0.005 radian and the value of E = 0.2 × 106 N/mm2, the depth of the joist, is

• (A) 200 mm
• (B) 250 mm
• (C) 300 mm
• (D) 400 mm