Quiz #4- Requires Respondus LockDown Browser_ 202309 - Structure & Prop. of Materials - 43380

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10/20/23, 9:06 PM Quiz #4- Requires Respondus LockDown Browser: 202309 - Structure & Prop. of Materials - 43380 https://learn.ontariotechu.ca/courses/24437/quizzes/55087 1/7 Quiz #4- Requires Respondus LockDown Browser Due Oct 6 at 11:03a.m. Points 15 Questions 15 Available Oct 6 at 10:44a.m. - Oct 6 at 11:03a.m. 19 minutes Time Limit 10 Minutes Allowed Attempts 2 Requires Respondus LockDown Browser Instructions This quiz was locked Oct 6 at 11:03a.m.. Attempt History Attempt Time Score LATEST Attempt 1 9 minutes 5 out of 15 Score for this attempt: 5 out of 15 Submitted Oct 6 at 10:54a.m. This attempt took 9 minutes. Quiz #4 You are allowed only one attempt. But 2 attempts have been enabled to account for login issues. Please note that all extra attempts will be monitored . 0 / 1 pts Question 1 If we take the natural log of the equation for diffusion coefficient, we get the equation of a straight line which has a slope of: -Q/R orrect Answer orrect Answer
10/20/23, 9:06 PM Quiz #4- Requires Respondus LockDown Browser: 202309 - Structure & Prop. of Materials - 43380 https://learn.ontariotechu.ca/courses/24437/quizzes/55087 2/7 -1/T You Answered You Answered -Q/T 1/T 1 / 1 pts Question 2 Which of the following is NOT TRUE for steady-state diffusion? The concentration gradient is constant There is no net transfer of mass Correct! Correct! The diffusion flux is constant The concentration profile is linear 0 / 1 pts Question 3 Lesser distortion in the crystal lattice is created under self-interstitial defect. True You Answered You Answered False orrect Answer orrect Answer 1 / 1 pts Question 4
10/20/23, 9:06 PM Quiz #4- Requires Respondus LockDown Browser: 202309 - Structure & Prop. of Materials - 43380 https://learn.ontariotechu.ca/courses/24437/quizzes/55087 3/7 The solution of the non-steady state equation applied in two situations is greatly simplified when: The resultant concentration is the same in the two situations. Correct! Correct! the absolute temperature is the same for the two situations. the applied surface concentration is same in the two situations. the distance from the surface is same for the two situations. 0 / 1 pts Question 5 The relationship between temperature and activation energy for diffusion is: Linear You Answered You Answered Constant orrect Answer orrect Answer Exponential 0 / 1 pts Question 6 Inter-diffusion is defined as: exchange of host atom and vacancy position diffusion of atoms of one solid material into another material orrect Answer orrect Answer diffusion of atoms between tetrahedral and octahedral interstitial sites You Answered You Answered
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10/20/23, 9:06 PM Quiz #4- Requires Respondus LockDown Browser: 202309 - Structure & Prop. of Materials - 43380 https://learn.ontariotechu.ca/courses/24437/quizzes/55087 4/7 0 / 1 pts Question 7 Diffusion of atoms generally requires less activation energy in BCC than FCC. True orrect Answer orrect Answer False You Answered You Answered 0 / 1 pts Question 8 The atoms of two elements having radii similar to each other tend to have lower solubility in each other. True You Answered You Answered False orrect Answer orrect Answer 0 / 1 pts Question 9 A polycrystalline material is best defined as a material that has: many grains of different sizes randomly aligned orrect Answer orrect Answer many grains of the same size randomly aligned You Answered You Answered
10/20/23, 9:06 PM Quiz #4- Requires Respondus LockDown Browser: 202309 - Structure & Prop. of Materials - 43380 https://learn.ontariotechu.ca/courses/24437/quizzes/55087 5/7 many grains of the same size uniformly aligned many grains of different sizes uniformly aligned 1 / 1 pts Question 10 Replacement of an impurity atom in the crystal lattice is called a . . . . . . . volume imperfections Vacancy defect Stacking defect Substitution impurity Correct! Correct! 0 / 1 pts Question 11 An element would diffuse at the same rate in different host metals if the temperature and concentration gradient are kept the same. True You Answered You Answered False orrect Answer orrect Answer 0 / 1 pts Question 12
10/20/23, 9:06 PM Quiz #4- Requires Respondus LockDown Browser: 202309 - Structure & Prop. of Materials - 43380 https://learn.ontariotechu.ca/courses/24437/quizzes/55087 6/7 Materials with many close-packed directions have generally more slip systems than those with fewer close-packed directions. True orrect Answer orrect Answer False You Answered You Answered 1 / 1 pts Question 13 Carbon atoms are found in the spaces between iron atoms in steel. This is defect is known as: interstitial Correct! Correct! Vacancy Substitutional Dislocation 0 / 1 pts Question 14 Which one of the following is not a zero-dimensional defect? Screw dislocation orrect Answer orrect Answer Substitution imperfection You Answered You Answered Vacancy defect
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10/20/23, 9:06 PM Quiz #4- Requires Respondus LockDown Browser: 202309 - Structure & Prop. of Materials - 43380 https://learn.ontariotechu.ca/courses/24437/quizzes/55087 7/7 1 / 1 pts Question 15 The boundaries that separate two small grains in polycrystalline materials are called . . . . . . Grain boundaries Correct! Correct! Screw boundaries Substitutional boundaries Quiz Score: 5 out of 15