Igcse Model Questions Vol1 2025 Physics Question 35

Practice objective / multiple choice question 35 from the 2025 Igcse Model Questions Vol1 Physics examination.

Igcse Model Questions Vol1 2025 Physics Objective / Multiple Choice Medium Difficulty
Question 35 IGCSE_MODEL_QUESTIONS_VOL1 • 2025 • PHYSICS • objective

A steel rod 2.00 m long at \(20^{\circ}\text{C}\) has a coefficient of linear expansion \(\alpha = 1.2\times10^{-5}\,\text{K}^{-1}\) and Young's modulus \(E = 200\,\text{GPa}\). The rod is fixed rigidly at both ends so it cannot expand. The temperature is raised uniformly to \(120^{\circ}\text{C}\). (a) What thermal strain would the rod experience if it were free to expand? (b) What compressive stress is induced in the rod because of the constraints? (c) Given a yield stress of \(250\,\text{MPa}\), will the rod yield under this temperature change?

Answer Options

A. a) 1.0×10⁻³; b) 200 MPa (compressive); c) No, it will not yield
B. a) 1.2×10⁻³; b) 240 MPa (compressive); c) Yes, it will yield
C. a) 1.2×10⁻³; b) 240 MPa (tensile); c) No, it will not yield
Correct Answer D. a) 1.2×10⁻³; b) 240 MPa (compressive); c) No, it will not yield
Correct Answer
D
Correct Option:
a) 1.2×10⁻³; b) 240 MPa (compressive); c) No, it will not yield

About This Question

This is Igcse Model Questions Vol1 2025 Physics Question 35. It is one of the objective questions from the 2025 Igcse Model Questions Vol1 Physics examination.

Difficulty level: Medium .

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