NPTEL Sensors and Actuators Week 4 Assignment Answers 2025
1. Complete the following sentence for SU 8:
“Soft bake is performed at___________ degrees centigrade.”
- 90
- 65
- 110
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2. Which amongst the following is the proper order for the processes related to photolithography?
I. Soft bake
II. Photoresist coating
III. Wafer Cleaning
IV. Primer coating
V. Exposure
VI. Alignment
VII. Development
- III – I – IV– II – V – VI– VII
- III – IV – II – I – VI – V – VII
- IV – I – II – VI – V – III – VII
- III – IV – I – II – V – VI – VII
Answer :-
3. Evaluate whether the below statement is true or false:
“Acetone is used as a photoresist stripper.”
- True
- False
Answer :-
4. As discussed in the session on the sensor used to understand the efficacy of the given drug, choose the best option when the drug is found effective.
- Cell lysis will occur, and the conductivity of the chip will decrease.
- Cell lysis will occur, and the conductivity of the chip will increase.
- Cell lysis will not occur, and the conductivity of the chip will increase.
- Cell lysis will not occur.
Answer :-
5. In the session on soft lithography, in which ratio of silicone elastomer and curing agent were used to prepare PDMS?
- 1:10
- 10:1
- 5:1
- 1:5
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6. Evaluate whether the below statement is true or false: “Matrigel acts as an extracellular matrix for the cells.”
- True
- False
Answer :-
7. Arduino is usually programmed using an IDE. What does IDE stand for in this context?
- Integrated Design Environment
- Integrated Development Environment
- Integrated Development Electronics
Answer :-
8. Complete the following sentence:
“………… is used for etching silicon dioxide during the fabrication processes.”
- BHF
- Acetone
- Isopropyl Alcohol
Answer :-
9. During the fabrication of interdigitated electrodes, which material is deposited before the deposition of a thick layer of gold for strong adhesion of gold to the substrate?
- Nickel
- Platinum
- Chrome
Answer :-
10. What is the optimum temperature and duration for curing the PDMS mold, as demonstrated during the lab session?
- 70 degree centigrade for 1 hour
- 80 degree centigrade for 2 hours
- 70 degree centigrade for 2 hours
- 60 degree centigrade for 1 hour
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