WAEC Physics 2024 Objective — Question 30
Question 30 of 50 from the West African Examinations Council (WAEC) Physics 2024 Objective paper, with the correct answer and a full explanation.
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30. Which of the following terms has different dimension from the other?
- A. Stress x strain
- B. Stress/strain
- C. Pressure
- D. TorqueCorrect
Explanation
Stress=Force/Area=ML^-1T^-2. Strain=Extension/Length is dimensionless. Thus, stress x strain and stress/strain both have the same dimension as stress (ML^-1T^-2). Pressure=Force/Area=ML^-1T^-2. Torque=Force x distance=ML^2T^-2, which is different.
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