Stress, strain and the Young modulus Quiz
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5 questions, one answer each
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1. A rod of area 2.0 × 10⁻⁴ m² carries a tensile force of 6.0 kN. What is the stress?
- A. 3.0 × 10⁷ Pa
- B. 1.2 × 10⁰ Pa
- C. 3.0 × 10¹⁰ Pa
- D. 3.3 × 10⁻⁸ Pa
2. A 2.0 m wire extends by 1.0 mm. What is the strain?
- A. 5.0 × 10⁻⁴
- B. 2.0 × 10³
- C. 1.0 × 10⁻³
- D. 0.50
3. What does the gradient of the straight part of a stress–strain graph give?
- A. Breaking stress
- B. The Young modulus
- C. The stiffness of the sample
- D. The strain at failure
4. A metal has E = 2.0 × 10¹¹ Pa. What stress produces a strain of 1.5 × 10⁻³?
- A. 3.0 × 10⁸ Pa
- B. 1.3 × 10¹⁴ Pa
- C. 7.5 × 10⁻¹⁵ Pa
- D. 3.0 × 10¹⁴ Pa
5. A wire has a diameter of 0.40 mm measured to ± 0.01 mm. What is the percentage uncertainty in its cross-sectional area?
- A. 2.5%
- B. 5.0%
- C. 0.25%
- D. 10%