The load on a spring per unit deflection is called:
Try it first: pick an option, then read the explanation.
Correct answer: A. stiffness
Asked in SSC JE 24/01/2018 (Evening)
Detailed Explanation
Springs are characterised by how much load produces one unit of deflection.
Why “stiffness” Is Correct
That ratio W/δ is the stiffness (spring constant or rate), in N/mm.
Why the Other Options Are Wrong
- B. proof resilience: Proof resilience is energy at the proof load.
- C. proof stress: Proof stress is the wire stress at the proof load.
- D. proof load: Proof load is the greatest load without permanent set.
Key Point
Stiffness k = W/δ; for a close coil k = Gd⁴/(64R³n).
Key Concepts for Students
- Flexibility = 1/k.
- Series springs: 1/k adds; parallel: k adds.
- Stiffness ∝ d⁴ and ∝ 1/(R³n).
Practice more: this is question 9 in Spring MCQs – Part 1. Try the whole set and check every answer instantly.