3. Stress concentration in static loading is more serious in (a) ductile materials (b) brittle materials (c) equally serious in both cases (d) depends on other factors (e) unpredictable. 4. Stress concentration in cyclic loading is more serious in (a) ductile materials (b) brittle materials (c) equally serious in both cases (d) depends on other factors (e) unpredictable. 5. Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to (a) dynamic loading (b) static loading (c) combined static and dynamic loading (d) completely reversed loading (e) all of the above.