Gradually applied static loads do not change with time their:
Try it first: pick an option, then read the explanation.
Correct answer: D. All options are correct
Asked in SSC JE 25/01/2018 (Morning)
Detailed Explanation
Loads are classed by how they vary with time. A static load is applied slowly and then stays constant. A dynamic load changes with time — moving vehicles, machinery vibration, wind gusts, earthquakes, impact.
Why “All options are correct” Is Correct
Because a static load is applied gradually and then held steady, it causes no acceleration of the structure, and its magnitude, direction and point of application all stay the same with time. So all the options are correct.
Why the Other Options Are Wrong
- A. magnitude: True, but direction and point of application are also unchanged.
- B. direction: True, but magnitude and point of application are also unchanged.
- C. point of application: True, but magnitude and direction are also unchanged.
Key Point
Static load: constant magnitude, direction and position; no inertia effects.
Key Concepts for Students
- A suddenly applied load produces twice the stress of the same load applied gradually.
- Dead loads are the typical static loads.
- Moving and impact loads need dynamic or impact factors.
Practice more: this is question 2 in Force Analysis MCQs – Part 1. Try the whole set and check every answer instantly.