Hooke's Law — Practice Quiz

Question 1

Hooke's law holds in the:

Accepted Answer

Elastic region (small strains)

Answer

Plastic region

Answer

Fracture region

Answer

Everywhere

Question 2

A wire of length L stretches by ΔL under tension F. If L is doubled keeping F and cross-section the same:

Accepted Answer

ΔL doubles

Answer

ΔL stays the same

Answer

ΔL halves

Answer

ΔL quadruples

Question 3

Stress in a wire under load is:

Accepted Answer

F/A

Answer

F·A

Answer

FA²

Answer

F/A²

Question 4

If strain is ε = 10⁻³ and Young's modulus Y = 2 × 10¹¹ Pa, stress is:

Accepted Answer

2 × 10⁸ Pa

Answer

2 × 10¹¹ Pa

Answer

2 × 10⁵ Pa

Answer

Cannot find

Question 5

Elastic potential energy per unit volume:

Accepted Answer

½·stress·strain

Answer

stress·strain

Answer

Y·ε²

Answer

½·Y²ε