Fundamentals Of Nanoscience Set 1

Electrical Engineering,

Chemical Engineering

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This set of Fundamentals of NanoScience Multiple Choice Questions & Answers (MCQs) focuses on Fundamentals Of Nanoscience Set 1

Q1 | Nanomaterials are the materials with at least one dimension measuring less than
  • 1 nm
  • 10 nm
  • 100 nm
  • 1000 nm
Answer: 100 nm
Explaination:
a material with at least one of its dimensions measuring less than 100 nm (1 to 100nm) are classified as nanomaterials.
Q2 | A material with one dimension in Nano range and the other two dimensions are large is called
  • micro-material
  • quantum wire
  • quantum well
  • quantum dot
Answer: quantum well
Explaination:
such a material with one dimension in nano range and other two large is called quantum well. a material with two of the three dimensions in the nano range and third large is called quantum wire. when all the dimensions are in nano range, it is called quantum dot.
Q3 | The colour of the nano gold particles is
  • yellow
  • orange
  • red
  • variable
Answer: variable
Explaination:
the colour of the nano gold particle varies with the size of the particles. it shows different colours like orange, red, purple, or greenish.
Q4 | The melting point of particles in nano form
  • increases
  • decreases
  • remains same
  • increases then decreases
Answer: decreases
Explaination:
for the particles in the nano form, the melting point reduces significantly. other chemical properties are also changed as the dimensions of the object comes in the nano range.
Q5 | The first talk about nano-technology was given by                        
  • albert einstein
  • newton
  • gordon e. moore
  • richard feynman
Answer: richard feynman
Explaination:
in 1959, richer feynman gave a speech in which he spoke of nano-science and nano-technology. he talked about the possibility of manipulating individual atoms and molecules.
Q6 | Which of the processes of materials was not described as Nanotechnology?
  • separation
  • creation
  • processing
  • consolidation
Answer: creation
Explaination:
nanotechnology, as defined by professor n. taniguchi, consists of the processing, separation, consolidation and deformation of materials by one atom or by one molecule. it is used exclusively for the nanomaterials.
Q7 | The initial tools used to help launch the nanoscience revolution were                        
  • binoculars
  • microscope
  • scanning probe instruments
  • interferometer
Answer: scanning probe instruments
Explaination:
scanning probe instruments were the initial tools used by the scientist. in these instruments, the probe slides along the surface of the specimen.
Q8 | When semiconductors are reduced to nanometres they become pure conductors.
  • true
  • false
Answer: false
Explaination:
when semiconductors are reduced to the nano form their chemical properties change significantly and they become insulators, as there is no more space for free electrons to move.
Q9 | The major difference between the nano materials compared to the bulk form is the big fraction of the total number of atoms on the surface.
  • true
  • false
Answer: true
Explaination:
as the bulk material is changed into nano form, the number of atoms on the surface turns out to be a large fraction of the total number of atoms present in the material.
Q10 | The size of atoms is nearly                          
  • 0.01 nm
  • 0.1 nm
  • 1 nm
  • 10 nm
Answer: 0.1 nm
Explaination:
the size of the atoms is nearly
Q11 | The four types of Artificial nanomaterials are
  • carbon-based, non-metallic, composites and ceramics
  • carbon-based, metallic, composites and ceramics
  • carbon-based, non-metallic, composites and dendrimers
  • carbon-based, metallic, composites and dendrimers
Answer: carbon-based, metallic, composites and dendrimers
Explaination:
artificial nanomaterials can be divided into four categories – carbon-based, metal-based, dendrimers and composites. the other types of nanomaterials are called natural nanomaterials.
Q12 | Solution of pure buckminsterfullerene has a colour of                        
  • green
  • purple
  • pink
  • yellow
Answer: purple
Explaination:
solutions of pure c60 have a deep purple colour. they are a class of allotropes of carbon which conceptually are graphene sheets rolled into spheres.
Q13 | HyFn stands for                      
  • hydrated fluorine
  • hydrolysed fluorine
  • hydrolysed fullerene
  • hydrated fullerene
Answer: hydrated fullerene
Explaination:
hyfn stands for hydrated fullerene. it is a stable, highly hydrophilic, super-molecular complex consisting of c60 molecules.
Q14 | Nano sized polymers built from branched units are called                      
  • dendrimers
  • composites
  • carbon-based materials
  • metal-based materials
Answer: dendrimers
Explaination:
the nano-sized polymers built from branched units are called dendrimers. the dendrimers can be used to perform many chemical functions, such as catalysis, as it has numerous chain ends.
Q15 | Which property of nanoparticles provides a driving force for diffusion?
  • optical properties
  • high surface area to volume ratio
  • sintering
  • there is no such property
Answer: high surface area to volume ratio
Explaination:
the nanoparticles provide a high driving force for diffusion, as it has a high surface area to volume ratio. this driving force is even higher at elevated temperatures.
Q16 | On both ends of the CNTs, which carbon nanostructure is placed?
  • graphite
  • diamond
  • c60
  • benzene
Answer: c60
Explaination:
carbon nanotubes, cnts, are nanostructures with large application potential. its structure consists of a single sheet of graphite rolled into a tube. the ends of the cnts are capped with c60 hemispheres.
Q17 | When semiconductors are reduced to nanometres they become pure conductors.
  • true
  • false
Answer: false
Explaination:
when semiconductors are reduced to the nano form their chemical properties changes significantly and they become insulators, as there is no more space for free electrons to move.
Q18 | Quantum dots can be used in                    
  • crystallography
  • optoelectronics
  • mechanics
  • quantum physics
Answer: optoelectronics
Explaination:
quantum dots are basically semiconductor nanoparticles that show a particular colour on illumination by a light. they have unique electrical and optical properties. due to this, they are widely used in optoelectronics.
Q19 | Vesicle is a type of                      
  • nanostructure
  • nanoparticle
  • nanocrystal
  • supramolecular system
Answer: supramolecular system
Explaination:
vesicle is a bubble of liquid within another liquid, a supramolecular assembly made up of man different molecules. they can be formed naturally as well as artificially.
Q20 | The response of a material due to the function of heat is known as                      
  • mechanical property
  • electrical property
  • chemical property
  • thermal property
Answer: thermal property
Explaination:
mechanical properties deal with the effects of external forces, while electric properties deal with the effect of the flow of electricity, and chemical properties are related to a material’s effects due to reaction with other substances. thermal properties deal with heat and temperature effects on the material.
Q21 | Specific heat of materials is expressed in terms of                      
  • w/m k
  • j/k
  • j/kg k
  • m3/kg
Answer: j/kg k
Explaination:
specific heat capacity of a material is an intensive property expressed in terms of j/kg k. thermal conductivity, heat capacity, and specific volume are expressed in terms of w/m k, j/k, and m3/kg correspondingly.
Q22 | What effect does the addition of thermal energy have on a material?
  • thermal contraction
  • thermal expansion
  • no change
  • reproduction
Answer: thermal expansion
Explaination:
addition of heat or thermal energy results in an increase in magnitude as a theory of basic laws of thermodynamics. hence, on the addition of thermal energy, thermal expansion occurs.
Q23 | Which term is used to define the temperature at which a substance changes its status from solid to liquid?
  • boiling point
  • melting point
  • condensation point
  • freezing point
Answer: melting point
Explaination:
the temperature at which a substance changes from solid state to liquid is known as the melting point; here the temperatures of solid and liquid are in equilibrium. the shift of liquid state to solid is known as the freezing point. the transition from gaseous state to liquid is known as
Q24 | The melting point of Iron (Fe) is                    
  • 660oc
  • 1084oc
  • 419oc
  • 1538oc
Answer: 1538oc
Explaination:
the melting point of iron is 1538oc, whereas the melting points of aluminum (al), zinc (zn), and copper (cu) are 660oc, 419oc, and 1084oc in that order.
Q25 | What effect do thermal variations in volume have on a body?
  • expansion
  • contraction
  • cracking
  • phase transformation
Answer: cracking
Explaination:
cracking is the effect of thermal variation in the volume of a body. expansion, contraction, and phase transformation are the ways in which these volume changes occur, i.e. they are causes, and not effects.
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