NPTEL Sensors and Actuators Week 5 Assignment Answers 2025
1. Evaluate whether the below statement is true or false:
“Silicon dioxide can act as a selective mask against diffusion at high temperatures.”
- True
- False
Answer :- For Answers Click Here
2. Considering COMSOL Multiphysics simulation, what should be the flow of the modelling ?
I. Make geometry
II. Post process results
III. Add materials
IV. Choose type of study
V. Apply physics conditions
- I, III, V, II, IV
- I, III, V, IV, II
- I, III, V, II, IV
Answer :-
3. Complete the following statement:
“ Miller indices describe the ………… of different crystal planes in the basic unit cell.”
- Flats
- Phase
- Orientation
Answer :-
4. Choose the correct statements with regards to thermal oxidation:
I. Room temperature silicon in air creates very thin layer of “native oxide”.
II. Dry oxidation is used for creating thicker oxide layers.
III. Wet oxidation is faster than dry oxidation.
- I and II
- I and III
- II and III
Answer :-
5. Which of the following was responsible for converting linearly polarized light to circularly polarized light in an ellipsometer ?
- Analyzer
- Polarizer
- Quarter wave plate
Answer :-
6. What is the angle between primary and secondary flats for <100> p-type silicon wafer?
- 180 degree
- 90 degree
- 45 degree
Answer :- For Answers Click Here
7. Evaluate whether the below statement is true or false:
“Evaporation and Sputtering are two different types of physical vapor deposition techniques.”
- True
- False
Answer :-
8. Complete the following statement as discussed in lecture based on COMSOL Multiphysics:
“Shape memory alloy is a type of …………material.”
- Ferromagnetic
- Ferroelastic
- Ferroelectric
Answer :-
9. Evaluate whether the below statement is true or false:
“There is no secondary flat in <111> p-type silicon wafer.”
- True
- False
Answer :-
10. Choose the correct statements with regards to MQ-3 gas sensor.
I. It is based on the principle of redox reaction.
II. Tin oxide acts as the gas sensing layer.
III. Nickel chromium alloy is the heating element. IV. It is used for detecting methane.
- II and III
- I, II, and IV
- I and III
- I, II, and III
Answer :- For Answers Click Here
