Fundamentals Of Nanoscience Set 6

Electrical Engineering,

Chemical Engineering

Practice Mode Previous Next
On This Page

This set of Fundamentals of NanoScience Multiple Choice Questions & Answers (MCQs) focuses on Fundamentals Of Nanoscience Set 6

Q1 | CNT exhibits a property called ballistic condition.
  • false
  • true
Answer: true
Explaination:
cnt is very good thermal conductor and exhibit a property called as ballistic condition. single walled cnt at room temperature has thermal conductivity of 3500wm-1k-1.
Q2 | CNT is                    
  • non toxic
  • toxic
  • very safe
  • not having graphene
Answer: toxic
Explaination:
cnt is toxic. at some conditions it crosses the membrane barriers and reach organs which includes harmful effects like inflammatory.
Q3 | CNT is used to make                        
  • paper batteries
  • high voltage batteries
  • car batteries
  • clock batteries
Answer: paper batteries
Explaination:
a paper batteries is a battery engineered to use a paper thin sheet of cellulose infused with cnt. here cnt are used as electrodes allowing the storage devices to conduct electricity.
Q4 | The microwave absorptions are used for
  • military radars
  • solar cells
  • space elevators
  • stab proof
Answer: solar cells
Explaination:
most promising applications of cnt is solar cells. it is due to their strong uv absorption characteristics. it is developed at niit.
Q5 | CNT can store                    
  • nitrogen
  • carbondioxide
  • hydrogen
  • peroxides
Answer: hydrogen
Explaination:
cnt can store hydrogen. it can
Q6 | CNT can be used for coating and absorption on the surface                
  • fibre
  • design
  • stains
  • marks
Answer: fibre
Explaination:
cnt is also used in textiles. it can be used for coating and absorption on the
Q7 | A spray of CNT mixture on ceramic coatings gives the ability to resist                  
  • stains
  • damage
  • smoothness
  • clearness
Answer: damage
Explaination:
a spray of cnt mixture on ceramic coatings gives the ability to resist the damage while absorbing the laser light. this application is called optical power detectors.
Q8 | 5 METHODS OF SYNTHESIS(ARC-GROWTH, LASER ABLATION, CVD ROUTES, PLASMA CVD)
  • 1992
  • 1991
  • 1990
  • 1993
Answer: 1991
Explaination:
carbon nano tubes are observed in an year 1991 in the soot of the graphite during the arc discharge. first production of cnt was in 1992 by arc discharge method.
Q9 | The current used in the arc discharge method is about                    
  • 100ma
  • 200ma
  • 300ma
  • 400ma
Answer: 100ma
Explaination:
the current used in the arc discharge method is about 100ma. by arc
Q10 | The carbon contained in the negative electrode sublimates.
  • true
  • false
Answer: true
Explaination:
the carbon contained in the negative electrode sublimates because of high discharge temperature. this method is widely used method.
Q11 | The substrate is heated to                  
  • 200c
  • 300c
  • 400c
  • 700c
Answer: 700c
Explaination:
the substrate is heated to 700c and a mixture of nitrogen and carbon containing acetylene or ethylene or ethanol or methane was passed.
Q12 | A solid that offers no                    passage of electricity is called super conductors.
  • conductance
  • inductance
  • resistance
  • impedance
Answer: resistance
Explaination:
a solid that offers no resistance passage of electricity is called super conductors. they are very good conductors of electricity.
Q13 | The phenomena of super conductors was first discovered by                        
  • kammerlingh onnes
  • neils bohr
  • richard smalley
  • otto lehman
Answer: kammerlingh onnes
Explaination:
the phenomena of super conductors were first discovered by kammerlingh onnes. neils bohr given about atomic structure. richard smalley discovered the fullerene by laser ablation method. otto lehman coined the name liquid crystal.
Q14 | The earliest superconductors to be studied elaborately is                  
  • niobium alloy
  • copper alloys
  • steel alloys
  • iron alloy
Answer: niobium alloy
Explaination:
the earliest superconductors to be studied elaborately are niobium alloy. the super conductivity can be understood with the help of quantum physics.
Q15 | The shifting of electrons in super conductors is prevented by                    
  • quantum effect
  • threshold energy level
  • energy barrier
  • orbitals
Answer: quantum effect
Explaination:
the shifting of electrons in super conductors is prevented by quantum energy.
Q16 | The normal metal passes into super conducting state at                        
  • high temperature
  • low temperature
  • critical temperature
  • no temperature
Answer: critical temperature
Explaination:
the normal metal passes into super conducting state at critical temperature. most of the metals act as super conductors at low temperatures.
Q17 | Based on magnetic response super conductors are of                      types.
  • 1
  • 2
  • 3
  • 4
Answer: 2
Explaination:
based on the magnetic response super conductors are of two types. they are ideal super conductors or hard super conductors.
Q18 | The ideal super conductors exhibit
  • meissner effect
  • mesmeric effect
  • mesomeric effect
  • monomeric effect
Answer: meissner effect
Explaination:
the ideal super conductors exhibit meissner effect. the expulsion of magnetic flux from the interior of a piece of super conducting material as the material undergoes transition to super conducting phase.
Q19 | This functions as a super conductor at a critical temperature of                  
  • 30ok
  • 60ok
  • 90ok
  • 120ok
Answer: 90ok
Explaination:
this functions as a super conductor at a critical temperature of 900k. charged particles in solids can travel only in fixed directions or levels.
Q20 | The constituents of this material that is yttrium, barium and copper are in
  • 1:1:1
  • 1:2:2
  • 1:2:3
  • 1:2:1
Answer: 1:2:3
Explaination:
the constituents of this material
Q21 | Annealing the homogeneous mixture to room temperature to retain its                      
  • composition
  • structure
  • its properties
  • composition, structure and its properties
Answer: composition, structure and its properties
Explaination:
annealing the homogeneous mixture to room temperature to retain its composition, structure and its properties.
Q22 | Graphite has layered                    structure.
  • three dimensional structure
  • pyramidal
  • planar
  • bipyramidal
Answer: planar
Explaination:
graphite has layered planar structure. the individual layers are called as graphene. in each layer is arranged in the honey comb lattice.
Q23 | Bonding between the layers is                    
  • strong
  • weak
  • very tightly bonded
  • not bonded
Answer: weak
Explaination:
bonding between the layers is weak vander waals forces. the covalent bonds are present in between the atoms of the planes.
Q24 | The graphite is                    anisotropic.
  • highly
  • lightly
  • not
  • very less
Answer: highly
Explaination:
the graphite is highly anisotropic. since the phonons propagate quickly along the tightly bound planes but are slower to travel from one place to another.
Q25 | In oxygen containing atmospheres, the graphite readily converted into                    
  • carbon-monoxide
  • carbondioxide
  • carbonmonosulphide
  • carbon-disulphide
Answer: carbondioxide
Explaination:
in oxygen containing atmospheres, the graphite readily converted into carbondioxide at temperatures of 700oc and above.
Previous Next