WorksheetsME5517 Revision Session
Total questions: 10
Worksheet time: 8mins
Why do we study nature, its designs and solutions, and derive principles that we can apply to modern materials?
(A) Look to nature for new ideas
(B) Efficient use of natural resources in a more sustainable manner
(C) The materials that nature has at its disposal are weak, but they are combined in a very ingenious way to produce tough components and robust designs.
(D) All the natural materials have better functionalities than engineering materials
Which of the following is/are natural materials?
(A) Sea shells
(B) Biological materials
(C) Wood
(D) Water
Biological (or natural) materials can be classified as:
(A) Soft and hard biological materials
(B) Biopolymers and biominerals
(C) Protein, sugar and mineral
(D) Biopolymers, biominerals, bioelastomers and biocellular materials
In the Mayers Heptahedron, which of the following is/are relevant to mechanical properties of biological systems:
(A) Self-assembly
(B) Hydration
(C) Ambient environment synthesis
(D) Hierarchy
Which of the following structural design elements can improve toughness:
(A) Helical structures
(B) Layered structures
(C) Gradient structures
(D) Tubular structures
How much enhancement of fracture toughness for hydrated nacre compared to the monolithic aragonite?
(A) The same
(B) Four times
(C) Eight times
(D) Three thousand times
What is the thickness of the “brick” platelets in abalone nacreous shells:
(A) ~ 20 – 50 nm
(B) ~ 400 nm
(C) ~ 20 – 50 µm
(D) ~ 400 µm
Which of the following is the second most abundant natural polymer?
(A) Collagen
(B) Cellulose
(C) Chitin
(D) Chitosan
In terms of the Classical Gibson-Ashby, what is the relationship between elastic modulus and relative density for open-cell structures?
(A) Linear
(B) Square
(C) 3/2
(D) Cubic
What are the characteristic regions in typical mechanical behavior of cellular structures?
(A) An elastic region
(B) A collapse plateau
(C) A plastic necking region
(D) A densification region
