X
Courses » Defects in Crystalline Solids (Part-I)
Unit 2 - Week 1
Announcements
CourseAsk a Question Progress Mentor FAQ
A project of In association with Funded by
Powered by
© 2014 NPTEL - Privacy & Terms - Honor Code - FAQs -
Defects in Crystalline Solids (Part-I) - - Unit 2 -... https://onlinecourses.nptel.ac.in/noc18_mm11/u...
1 of 4 Wednesday 17 October 2018 12:41 AM
Course outline
How to access the portal
Week 1
Week 2 Week 3 Week 4 DOWNLOAD VIDEOS Week 5 Week 6 Week 7 Week 8 Lecture Notes
Lecture 01:
Introduction to Defects Lecture 02:
Equilibrium Points Defects Lecture 03: Energy of Vacancy Formation Lecture 04:
Vacancy Concentration Measurement Techniques Lecture 05:
Self-interstitial Defects+Frenkel Defects Quiz : Assignment 1
WEEK 1 - FEEDBACK - Defects in Crystalline Solids (Part-I) Assignment 1 Solution
Due on 2018-08-22, 23:59 IST.
1) 1 point
2) 1 point
3) 1 point
4) 1 point
5) 1 point
Assignment 1
The due date for submitting this assignment has passed.
As per our records you have not submitted this assignment.
Which one of the following defects is thermodynamically stable at room temperature
Point defects Line defects Surface defects Volume defects No, the answer is incorrect.
Score: 0
Accepted Answers:
Point defects
Which one of the following is not a zero dimensional defect
Vacancy defect Substitution Imperfection Schottky defect Screw dislocation No, the answer is incorrect.
Score: 0
Accepted Answers:
Screw dislocation
Twins (twin boundaries)comes under the category of
Point Imperfections Line Imperfections Volume Imperfection Surface Imperfection No, the answer is incorrect.
Score: 0
Accepted Answers:
Surface Imperfection
If no. of vacancies is 0, then Sconf(mix) =
0 1 Exp(1) Exp(-1)
No, the answer is incorrect.
Score: 0
Accepted Answers:
0
Configurational entropy Formation entropy Boltzman constant
Defects in Crystalline Solids (Part-I) - - Unit 2 -... https://onlinecourses.nptel.ac.in/noc18_mm11/u...
2 of 4 Wednesday 17 October 2018 12:41 AM
6) 1 point
7) 1 point
8) 1 point
9) 1 point
Enthalpy of formation No, the answer is incorrect.
Score: 0
Accepted Answers:
Formation entropy
Formation entropy of vacancy is very high Enthalpy of formation of vacancy is very high Vacancies can be easily removed from material
A very large increase in free energy is required to remove the last few vacancies from a system No, the answer is incorrect.
Score: 0
Accepted Answers:
A very large increase in free energy is required to remove the last few vacancies from a system
Monovacancies dominate at all temperatures up to melting temperature Magnitude of formation of di-vacancy is greater than that for two mono-vacancies No, the answer is incorrect.
Score: 0
Accepted Answers:
Magnitude of formation of di-vacancy is greater than that for two mono-vacancies
2x10-6 2x10-5 2x10-4 2x10-3
No, the answer is incorrect.
Score: 0
Accepted Answers:
2x10-5
Which of the following is NOT a technique to measure vacancy concentration
Density measurement Thermal expansion technique Heat capacity measurement Positron Annihilation Anisotropy No, the answer is incorrect.
Score: 0
Defects in Crystalline Solids (Part-I) - - Unit 2 -... https://onlinecourses.nptel.ac.in/noc18_mm11/u...
3 of 4 Wednesday 17 October 2018 12:41 AM
10) 1 point Accepted Answers:
Density measurement
Displacement of ion from regular location to interstitial location is known as:
Vacancy defect Line Imperfection Schottky’s defect Frenkel defect No, the answer is incorrect.
Score: 0
Accepted Answers:
Frenkel defect
