NPTEL Sensors and Actuators Week 2 Assignment Answers 2025
1. Evaluate whether the below statement is true or false:
“The four basic components of MEMS are microelectronics, microsensors, micro actuators, and microstructures.”
- True
- False
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2. What does the “Class” number of a clean room denote?
- The pressure inside the cleanroom.
- The number of people permitted inside the room at a given time.
- The number of particles per cubic feet allowed inside the facility.
- The lifetime in years for faithful operation of the facility.
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3. Evaluate whether the below statement is true or false:
“Understanding the breath signatures using VOC sensors is non-invasive way of determining the disease.”
- True
- False
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4. As discussed in the lecture video on cleanroom equipments, which of the following equipment is used to maintain the temperature and humidity levels for the appropriate growth and preservation of cell and tissue culture?
- Autoclave
- Incubator
- Desiccator
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5. Which kind of microscope is generally used for observing cells and organisms in culture, in petri dishes, flasks or microplates?
- Stereo Microscope
- Metallurgical Microscope
- Inverted Microscope
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6. What does VOC stands for?
- Volatile Organic Chemical
- Volatile Organic Compound
- Viscous Organic Compound
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7. As discussed in the lecture video on sensors for VOC detection, TCOs such as indium tin oxide, zinc oxide, tin oxide etc., were used as sensing material. What do you mean by TCOs in this regard?
- Thin Conducting Oxides
- Thin Coating Oxides
- Transparent Conducting Oxides
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8. What is the difference between Piezo-electric and piezo-resistive sensors?
- There is no difference, both are different names of the same phenomenon.
- Piezo-electric sensors are easier to interface with data acquisition systems than piezo-resistive sensors.
- Piezo-electric sensors accumulate charge in response to mechanical force while piezo-resistive sensors cause a change in resistance in response to mechanical force.
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9. Resistive sensors are one of the most widely used sensors. What will happen with the resistivity of metals and semiconductors when the temperature is increased?
- Increases
- Decreases
- For metal increases and for semiconductor decreases
- For metal decreases and for semiconductor increases
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10. The silicon or glass substrates being processed during the microfabrication process flow are always preferably stored in vacuum in desiccators. What is the need of desiccation?
- To avoid bending of the wafer under pressure
- To avoid heating of the wafer
- To avoid dust particles and other gases from contaminating the substrate
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