[amp_mcq option1=”Force per unit length” option2=”Force per unit volume” option3=”Force per unit area” option4=”None of these” correct=”option3″]
The correct answer is C. Force per unit area.
Stress is a measure of the internal forces acting on a material per unit area. It is a tensor quantity, meaning that it has both magnitude and direction. Stress can be caused by a variety of factors, including applied loads, temperature changes, and chemical reactions.
The SI unit of stress is the pascal (Pa), which is equal to one newton per square meter (N/m2).
Option A is incorrect because force per unit length is called linear stress.
Option B is incorrect because force per unit volume is called volumetric stress.
Option D is incorrect because stress is a real quantity that can be measured.