Review EMAT Q1- Structure of Atoms, Mechanical Properties

What is the smallest unit of matter?

• Molecule

• Atom

• Particle

• Cell

What is the study of the arrangement of atoms in materials called?

• Metallurgy

• Material science

• Crystallography

• Quantum mechanics

What is the graphical representation of the relationship between stress and strain?

• Stress-strain curve

• Force diagram

• Tension graph

• Deformation chart

Answer explanation

The graphical representation of the relationship between stress and strain for a material is called a stress-strain curve. This curve illustrates how a material responds to applied stress (force per unit area) by exhibiting strain (deformation) as a result. The stress-strain curve provides valuable information about the material's mechanical properties, such as yield strength, ultimate tensile strength, and ductility. This data is crucial for designing and analyzing structures and components to ensure they can withstand the expected loads without failure.

What law describes the linear relationship between stress and strain within the elastic limit?

• Newton's Law

• Hooke's Law

• Ohm's Law

• Boyle's Law

Which of the following is NOT a mechanical property of a material?

• Hardness

• Density

• Elasticity

• Ductility

Which of the following is a mechanical property of a material?

• Melting point

• Conductivity

• Tensile strength

• Chemical reactivity

What is the measure of a material's resistance to indentation or scratching?

• Hardness

• Toughness

• Elasticity

• Ductility

What is the measure of a material's ability to resist deformation and under tensile stress and regain original shape upon removal of load?

• Hardness

• Toughness

• Elasticity

• Ductility

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

Particles in an atom that are neutral and have no charge are 

• negatrons 
• electrons 
• neutrons 
• protons