NPTEL Biomedical Nanotechnology Assignment Solutions
NPTEL Biomedical Nanotechnology Week 1 Assignment Answers 2023
1. How many gold atoms lined up in a row would fit in a one nanometer space? (assuming a covalent radius of 0.144nm each)
- None; an oxygen atom is bigger than 1 nm
- Three and a half
- Seven
- Seventy
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2. Nanomaterials are not only human-made materials; can you remember some examples of “non-intentionally made” nanomaterials, i.e. a nanomaterial that you can find in nature?
- Gold nanoparticles
- Viruses
- Nano-transistor
- A bacteria
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3. Which of the following organism give rise to the idea of a ‘smart window’?
- Spider
- Butterfly
- Skeleton flower
- Moth
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4. Scientists have developed nanostructured pillars (without any dopant) based on the wing pattern of insects. When they incubated motile bacterial cells with these structures, they exhibited a bactericidal effect. Which of the following is the appropriate reason for the bactericidal effects of nanostructures?
- Chemical degradation of the bacterial cells
- Physical damage to bacterial cells
- Biochemical reactions on the cell surface when it comes in contact with patterns
- Molecular changes in proteomic level when cells come in contact with patterns
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5. Materials and setup required for silver nanoparticles synthesis by laser ablation methods:
- Silver nitrate, Nd YAG laser, mirror, concave lens, ultra-pure water, CTAB
- Silver nitrate, Nd YAG laser, mirror, ultra-pure water, x-y-z stage, LiAlH4
- Silver slice, Nd YAG laser, mirror, convex lens, ultra-pure water, x-y-z stage
- Silver slice, Nd YAG laser, mirror, concave lens, ultra-pure water, x-y-z stage
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6. Surface plasmon resonance is caused by, and the event is exclusive to, respectively-
- Incoherent oscillation of conduction band electrons by incident light and Metal nanoparticles.
- Coherent oscillation of conduction band electrons by incident light and Polymeric nanoparticles
- Incoherent oscillation of conduction band electrons by incident light and Polymeric nanoparticles
- Coherent oscillation of conduction band electrons by incident light and Metal nanoparticles
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7. Biosynthesis of Cadmium sulphide nanocrystals done by
- Candida glabrata
- Schizosaccharomyces pombe
- Verticillium
- Both Candida glabrata and Schizosaccharomyces pombe
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8. A student incubated viral capsid in phosphate buffer (pH 9) during the nanoparticle synthesis. He observed the size of the capsid before and after incubation using dynamic light scattering. What will be his observation?
- 10% increase of viral dimension
- 10% decrease of viral dimension
- 50% increase of viral dimension
- 50% decrease of viral dimension
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9. What overall charge does the particle acquire in a particular medium called?
- Spectroscopy
- Zeta potential
- Potentiometric
- Electrical conductivity
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10. Assertion(A): The AFM measures the force of attraction between a probe and sample surface.
- Reason(R): Works only on the conducting samples
- Both Assertion and reason are correct
- Only Assertion is correct
- Both assertion and reason are incorrect
- Only reason is correct
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