NPTEL Sensors and Actuators Week 12 Assignment Answers 2025
1. Why do biosensors have microheaters beneath interdigitated electrodes (IDEs)?
- To increase the sensitivity of biosensors.
- Matrigel is only stable at elevated temperatures.
- To maintain normal human body temperature on the chip.
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2. Gold (Au) and platinum (Pt) interdigitated electrodes have a thin layer of chromium (Cr) or titanium (Ti) deposited beneath the electrodes. Why is this done?
- This prevents Au or Pt from reacting with the oxide below.
- This reduces the cost and usage of metals like Au/Pt.
- Metals like Au/Pt have poor adhesion to oxide, and a thin layer of Cr/Ti improves the adhesion.
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3. In FDM-based 3D printing, FDM is the acronym for______________.
- Fusion Deposition Method
- Fused Depletion Modeling
- Fused Deposition Modeling
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4. Which type of 3D-printing technique requires the use of UV light?
- Fused Deposition Modeling
- Metal Jetting
- Laminated Object Manufacturing
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5. Evaluate whether the following statement is True/False:
“Polyvinyl Alcohol (PVA) is a water-soluble 3D printing material.”
- True
- False
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6. Which properties were measured using an ETM sensor for phenotyping of breast cancer tissue?
- capacitance, elasticity, specific heat
- resistance, elasticity, thermal conductivity
- capacitance, viscosity, thermal conductivity
- resistance, viscosity, specific heat
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7. Complete the following statement:
“______________ is the screening test for breast cancer.”
- Electrocardiography
- Mammography
- Positron Emission Tomography
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8. Evaluate if the statement is true or false:
“Stage I is considered as the early stage of invasive breast cancer.”
- True
- False
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9. Evaluate whether the statement is true or false:
“SLA is a 3D printing technology that builds parts by extruding melted plastic onto the build plate one layer at a time.”
- True
- False
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10. Complete the following sentence:
“…………….is the most widely used 3D printing technology due to the low cost of machine and maintenance.”
- SLS
- SLA
- FDM
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