Mechanical Aptitude Structural Mechanics and Materials Questions and Answers Flashcards
6 cards from real MECHANICAL APTITUDE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Mechanical Aptitude Structural Mechanics and Materials Questions and Answers flashcards as text
Tensile stress in a material is defined as:
Answer: Internal resisting force per unit area when the material is being pulled apart
Tensile stress is the internal force per unit cross-sectional area that resists being stretched or pulled apart along a member's length.
Engineering strain is calculated as:
Answer: Change in length divided by original length
Strain = ΔL / L₀, a dimensionless ratio measuring how much a material deforms relative to its original size.
Young's Modulus (Elastic Modulus) is the ratio of:
Answer: Stress to strain in the elastic region
Young's Modulus E = Stress / Strain within the elastic range, quantifying a material's stiffness — how much it resists elastic deformation.
What happens to a material that is loaded beyond its elastic limit?
Answer: It undergoes permanent (plastic) deformation
Beyond the elastic limit (yield point), plastic deformation occurs and the material retains a permanent set after the load is removed.
Shear stress acts on a cross-section in which direction?
Answer: Parallel to (tangential to) the cross-sectional area
Shear stress acts tangentially — parallel to the cross-sectional surface — as opposed to normal stress which acts perpendicular to it.
Which of the following typically has the highest tensile strength?
Answer: High-carbon steel
High-carbon steel can reach tensile strengths above 2,000 MPa, far exceeding aluminum alloys, concrete (which is weak in tension), and rubber.