Question

Which of the following can be the unit of stress?

1. Pa or N/m²
2. psi or pound of force/square inch
3. MPa or 106 Pa
4. GPa or 109 Pa
-1, 2
-2,3
-3,4
-1, 2, 3, 4

Answer 1

The correct units for stress or pressure can be 1. Pa or N/m², 2. psi or pound of force per square inch, 3. MPa or 10⁶ Pa, and 4. GPa or 10⁹ Pa, commonly used in different contexts and regions.

Step-by-step explanation:

The units of stress or pressure mentioned in the question can all be correct, depending on the circumstances in which they are used. They include:

• Pa or N/m² (Pascal or newton per square meter)
• psi or pound of force per square inch (pound per square inch)
• MPa or 10⁶ Pa (megapascal or million pascals)
• GPa or 10⁹ Pa (gigapascal or billion pascals)

One pascal is defined as one newton of force exerted over one square meter. This can be too small for practical purposes, hence the use of larger units like kPa, MPa, and GPa, or different systems' units like psi (common in the United States).