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MidTerm solution(1) (3).docx

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ENGR 2220U Structure and Properties of Materials Mid-Term Examination Instructor: Ghaus Rizvi Time: 120 minutes Date: October 20, 2012 Instructions:         Closed book & closed laptop. A calculator is allowed. Answer all questions The questions do not carry equal marks. Spend your time accordingly. The total mark is 100 and the exam time is 120 minutes. The marks for each question are given besides the Q# No communication with others at any time. Data sheet is on the back Q-1 Multip
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    ENGR 2220U Structure and Properties of Materials   Mid-Term Examination Instructor: Ghaus Rizvi Time: 120 minutes Date: October 20, 2012 Instructions:    Closed book & closed laptop.    A calculator is allowed.    Answer all questions    The questions do not carry equal marks. Spend your time accordingly.    The total mark is 100 and the exam time is 120 minutes.    The marks for each question are given besides the Q#     No communication with others at any time.    Data sheet is on the back  Q-1 Multiple choice, each question carries equal marks (15) 1) Ceramics are: a. Hard and very tough  b. Hard but not tough c. Brittle and soft d. malleable and strong 2) Important properties of Metals are: a. Strong and brittle  b. Strong and ductile c. Hard and non-deformable d. Stiff and non-deformable 3) Some examples of polymers are: a. Cotton, Nylon, petroleum, silk and hemp fibers  b. Cotton, Nylon, silk, glass fibers and wool fibers c. Cotton, Nylon, glass fibers, wool, silk and hemp fibers d. Cotton, Nylon, silk, polyethylene and PVC 4) Which of the following statements is true? a. Biomaterials are materials that mainly contain hydrocarbons  b. Biomaterials have their srcins in agricultural products only c. Biomaterials should not produce toxic substances in human body d. Biomaterials easily degrade when exposed to sun light 5) Properties of Iron cannot be changed over a very wide range by imparting proper heat treatment a. True  b. False 6) Non-linear stress strain relationship is generally exhibited by a. Polymeric materials  b. Metallic materials c. Composites d. Ceramics 7) Poisson’s ratio is  a. The ratio of applied stress to the resulting strain  b. The ratio of lateral strain to the normal strain c. The ratio of applied stress to lateral strain 8) True stress on a body deformed by the application of a force is defined as: a. Force divided by the actual cross sectional area  b. Force multiplied by the actual cross sectional area c. Force multiplied by the srcinal cross sectional area  d. Force divided by the srcinal cross sectional area 9) A material is isotropic if it: a. has uniform composition  b. Exhibits uniform properties in all direction c. Exhibits different properties in different direction 10) The larger the difference in electro negativity between two atoms, the greater is the tendency to form ionic bonds a. T  b. F 11) The solubility of a solute in general a. decreases with increasing pressure  b. decreases with increasing temperature c. is higher when crystal structures of constituents are similar d. is lower when the atom sizes are similar 12) The equilibrium number of vacancies Nv is a function of the following parameters a. Total number of atomic sites  b. Temperature c. Forces between atoms   d.  Boltzmann’s constant  13) In a unit crystal, 110 represents a. a point within it  b. a direction in it c. a plane in it 14) Covalent bonds are in general a. Stronger than ionic bonds  b. Weaker than secondary bonds c. Non directional in nature d. Directional in nature 15) Polymorphism is defined as a. the property of a material which enables it to form different crystal structure under different conditions  b. the property of a material which enables it to form different crystal sizes under different conditions c. the property of a material which enables it to form different compositions under different conditions  Q1  (6 marks) Sketch the following directions ]210[  and ]121[  in cubic unit cell? (2) a) ]210[   b) ]121[   1/2   1/2   x   y   z  

MT2soln.pdf

Jul 23, 2017
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