The Young modulus Quiz
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5 questions, one answer each
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1. A wire of cross-sectional area 2.0 × 10⁻⁶ m² carries a tension of 50 N. What is the tensile stress?
- A. 4.0 × 10⁻⁸ Pa
- B. 1.0 × 10⁻⁴ Pa
- C. 2.5 × 10⁷ Pa
- D. 1.0 × 10⁸ Pa
2. A rod of original length 2.0 m extends by 1.0 mm. What is the strain?
- A. 5.0 × 10⁻⁴
- B. 2.0 × 10³
- C. 5.0 × 10⁻⁴ m
- D. 0.50
3. A wire has Young modulus 2.0 × 10¹¹ Pa. The stress in the wire is 1.0 × 10⁸ Pa. What is the strain?
- A. 2.0 × 10³
- B. 5.0 × 10⁻⁴
- C. 2.0 × 10⁻³
- D. 5.0 × 10⁻³
4. Two wires are made from the same material and have the same length. Wire P has twice the diameter of wire Q. The same tension is applied to each. What is the ratio of the extension of P to the extension of Q?
- A. 1 : 2
- B. 1 : 4
- C. 2 : 1
- D. 4 : 1
5. In Required practical 4, which reason explains why the diameter of the wire contributes the largest percentage uncertainty?
- A. It is measured with a ruler
- B. It is small and is squared in the area calculation
- C. It changes when masses are added
- D. It is measured only once