Density, Hooke's law and stress-strain Quiz
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5 questions, one answer each
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1. A material has density 7800 kg m⁻³. What is the mass of 2.0 × 10⁻³ m³ of it?
- A. 3.9 × 10⁶ kg
- B. 0.26 × 10⁻⁶ kg
- C. 16 kg
- D. 3.9 kg
2. A spring has a spring constant of 200 N m⁻¹. What force is needed to extend it by 5.0 cm, within the Hooke's law region?
- A. 10 N
- B. 4.0 × 10³ N
- C. 1000 N
- D. 0.025 N
3. A wire of cross-sectional area 2.0 × 10⁻⁶ m² carries a tension of 100 N. What is the stress?
- A. 2.0 × 10⁻⁸ Pa
- B. 5.0 × 10⁷ Pa
- C. 5.0 × 10⁻⁸ Pa
- D. 2.0 × 10⁸ Pa
4. A wire of original length 1.50 m extends by 1.5 mm. What is the strain?
- A. 1.0 × 10⁻³
- B. 1.0 × 10³
- C. 1.0 × 10⁻³ m
- D. 2.3 × 10⁻³
5. Which statement correctly describes a brittle material?
- A. It stretches a long way before breaking
- B. It shows a large plastic region
- C. It fractures suddenly with little or no plastic deformation
- D. It always has a low breaking stress