Stress, strain and the Young modulus Quiz
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5 questions, one answer each
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1. A force of 200 N is applied to a wire of cross-sectional area 4.0 × 10⁻⁷ m². What is the stress?
- A. 5.0 × 10⁸ Pa
- B. 8.0 × 10⁻⁵ Pa
- C. 2.0 × 10³ Pa
- D. 5.0 × 10⁻⁹ Pa
2. 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. 2.3 × 10⁻³
- D. 1.5 × 10⁻³ m
3. Which quantity is given by the gradient of the straight section of a stress-strain graph?
- A. Stiffness k
- B. Breaking stress
- C. Young modulus
- D. Elastic strain energy
4. Which of these statements about a brittle material is correct?
- A. It has a long plastic region before it breaks
- B. It fractures with little or no plastic deformation
- C. It has a Young modulus of zero
- D. Its breaking stress is always greater than that of a ductile material
5. A student doubles the diameter of a wire of the same material and length. What happens to the Young modulus measured?
- A. It doubles
- B. It is four times larger
- C. It halves
- D. It is unchanged