McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering , Chemical Engineering .
| 101. |
The fullerenes that are larger in diameter than nano tubes and having walls of different thickness are |
| A. | mega tubes |
| B. | carbon nano tubes |
| C. | bucky ball clusters |
| D. | polymers |
| Answer» A. mega tubes | |
| Explanation: the fullerenes that are larger in diameter than the nano tube and having walls of different thickness are mega tubes. they are having different sizes. | |
| 102. |
Mega tubes are used for |
| A. | transport |
| B. | chemical industries |
| C. | laboratories |
| D. | preparation of compounds |
| Answer» A. transport | |
| Explanation: mega tubes are used for the transport potentially. they are a variety of molecules of different sizes. they are larger than the nano tubes. | |
| 103. |
The chain, two dimensional and three dimensional polymers are formed under |
| A. | vacuum |
| B. | high pressure |
| C. | low pressure |
| D. | no pressure |
| Answer» B. high pressure | |
| Explanation: the chain, two dimensional and three dimensional polymers are formed under | |
| 104. |
Spherical particles based on the multiple layers surrounding a buck ball core is called |
| A. | nano onions |
| B. | nano particles |
| C. | nano clusters |
| D. | nano materials |
| Answer» A. nano onions | |
| Explanation: spherical particles based on the multiple layers surrounding a buck ball core are called nano onions. these are proposed mostly for lubricants. | |
| 105. |
The buckminister fullerene is naturally occurring element found in |
| A. | earth |
| B. | soot |
| C. | smoke |
| D. | fog |
| Answer» B. soot | |
| Explanation: buckminister fullerene is the smallest fullerene molecule containing pentagonal and hexagonal rings. they are natural elements and found first in soot. | |
| 106. |
The structure of C60 is called as |
| A. | isohedron |
| B. | truncated isohedron |
| C. | trigonal |
| D. | trigonal bipyramidal |
| Answer» B. truncated isohedron | |
| Explanation: the structure of c60 is called as truncated isohedron. this resembles a foot ball structure. it consists of pentagons and hexagons linkage. | |
| 107. |
The vander-waals diameter of C60 is |
| A. | 1.1nm |
| B. | 1.2nm |
| C. | 1.3nm |
| D. | 1.4nm |
| Answer» A. 1.1nm | |
| Explanation: the vander-waals diameter of c60 is 1.1nm. there are twenty hexagons and | |
| 108. |
The bond length of the C60 is |
| A. | 1.1 ao |
| B. | 1.2 ao |
| C. | 1.3 ao |
| D. | 1.4 ao |
| Answer» D. 1.4 ao | |
| Explanation: the bond length of the buckminister fullerene is about 1.4 ao. the silicon bucky balls are created around the metal ions. | |
| 109. |
Carbon nano tubes are the sheets of graphite about |
| A. | 0.1nm |
| B. | 0.2nm |
| C. | 0.3nm |
| D. | 0.4nm |
| Answer» D. 0.4nm | |
| Explanation: carbon nano tubes are the sheets of graphite about 0.4nm in diameter. they are rolled up to make nm in diameter. they are very small in size. | |
| 110. |
Carbon nano tubes are also called as |
| A. | bucky tubes |
| B. | bulky tubes |
| C. | bulk tubes |
| D. | buck balls |
| Answer» A. bucky tubes | |
| Explanation: carbon nano tubes are also called as bucky tubes because they are also made up of graphite and they are in the form of tubes instead of balls. so, they are also called as bucky tubes. | |
| 111. |
In how many methods the CNT can be prepared? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| Explanation: the carbon nano tubes can be prepared in 4 types. they are: 1. arc discharge method, 2. laser ablation method, 3. plasma torch method, 4. chemical vapour deposition method. | |
| 112. |
A water cooled surface is used in the process to collect |
| A. | nano particles |
| B. | nano tubes |
| C. | nano spheres |
| D. | nano sheets |
| Answer» B. nano tubes | |
| Explanation: a water cooled surface is used in the process to collect the nano tubes. while an inert gas is blend into chamber, the nano tubes settles on cooler surfaces. | |
| 113. |
Plasma torch method is similar to the |
| A. | laser ablation |
| B. | arc discharge |
| C. | chemical vapour decomposition |
| D. | electrolysis |
| Answer» B. arc discharge | |
| Explanation: plasma torch method is similar to the arc discharge method. it is first started to make the single walled cnt in 2005. | |
| 114. |
Plasma torch method produces of CNT per minute. |
| A. | 1gms |
| B. | 2gms |
| C. | 3gms |
| D. | 4gms |
| Answer» B. 2gms | |
| Explanation: plasma torch method is to produce 2gms of cnt per minute. a metal crystal is used. in a thermal plasma torch method is a high frequency oscillating current in a coil. | |
| 115. |
Chemical vapour decomposition is developed in an year |
| A. | 2001 |
| B. | 2002 |
| C. | 2006 |
| D. | 2007 |
| Answer» D. 2007 | |
| Explanation: chemical vapour decomposition is developed in the year 2007 at university of cincinnati, usa. in this method the substrate is prepared with a layer of metal catalyst nano particles. | |
| 116. |
CNT s are the strongest and stiffest materials in |
| A. | tensile strength |
| B. | ductility |
| C. | elasticity |
| D. | energy |
| Answer» A. tensile strength | |
| Explanation: cnt s are the strongest and stiffest materials in tensile strength which is due to the covalent sp2 bonds between the individual carbon atoms. | |
| 117. |
CNT posses strength up to |
| A. | 100gpa |
| B. | 200gpa |
| C. | 400gpa |
| D. | 300gpa |
| Answer» A. 100gpa | |
| Explanation: cnt posses strength up to 100gpa. chemical vapour decomposition is mostly used because of its low cost and direct growth of catalyst on surface. | |
| 118. |
Standard single walled CNT withstands a pressure up to without deformation. |
| A. | 1gpa |
| B. | 2gpa |
| C. | 20gpa |
| D. | 25gpa |
| Answer» D. 25gpa | |
| Explanation: standard single walled cnt withstands a pressure up to 25gpa without deformation. it also possess strength up to 100gpa. | |
| 119. |
Multi walled CNT are concentric nano tubes. |
| A. | single |
| B. | double |
| C. | triple |
| D. | multiple |
| Answer» D. multiple | |
| Explanation: multi walled cnt are multiple concentric nano tubes nested with in one another which exhibit a striking telescoping property. | |
| 120. |
The nano tube may without friction. |
| A. | slides |
| B. | overlaps |
| C. | under laps |
| D. | collides |
| Answer» C. under laps | |
| Explanation: the nano tubes may slides without the friction and within its outer nano tube. this property is utilised to create a smallest rational motor and gigahertz mechanical oscillator. | |
| 121. |
CNT is |
| A. | conductor |
| B. | insulator |
| C. | semi conductor |
| D. | impure metal |
| Answer» C. semi conductor | |
| Explanation: cnt is semiconductor. because of symmetry and unique electronic structure of graphene, it is semi conducting material with small band gap between valence band and conducting band. | |
| 122. |
CNT exhibits a property called ballistic condition. |
| A. | false |
| B. | true |
| Answer» B. true | |
| Explanation: 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. | |
| 123. |
CNT is |
| A. | non toxic |
| B. | toxic |
| C. | very safe |
| D. | not having graphene |
| Answer» B. toxic | |
| Explanation: cnt is toxic. at some conditions it crosses the membrane barriers and reach organs which includes harmful effects like inflammatory. | |
| 124. |
CNT is used to make |
| A. | paper batteries |
| B. | high voltage batteries |
| C. | car batteries |
| D. | clock batteries |
| Answer» A. paper batteries | |
| Explanation: 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. | |
| 125. |
The microwave absorptions are used for |
| A. | military radars |
| B. | solar cells |
| C. | space elevators |
| D. | stab proof |
| Answer» B. solar cells | |
| Explanation: most promising applications of cnt is solar cells. it is due to their strong uv absorption characteristics. it is developed at niit. | |
| 126. |
CNT can store |
| A. | nitrogen |
| B. | carbondioxide |
| C. | hydrogen |
| D. | peroxides |
| Answer» C. hydrogen | |
| Explanation: cnt can store hydrogen. it can | |
| 127. |
CNT can be used for coating and absorption on the surface |
| A. | fibre |
| B. | design |
| C. | stains |
| D. | marks |
| Answer» A. fibre | |
| Explanation: cnt is also used in textiles. it can be used for coating and absorption on the | |
| 128. |
A spray of CNT mixture on ceramic coatings gives the ability to resist |
| A. | stains |
| B. | damage |
| C. | smoothness |
| D. | clearness |
| Answer» B. damage | |
| Explanation: 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. | |
| 129. |
5 METHODS OF SYNTHESIS(ARC-GROWTH, LASER ABLATION, CVD ROUTES, PLASMA CVD) |
| A. | 1992 |
| B. | 1991 |
| C. | 1990 |
| D. | 1993 |
| Answer» B. 1991 | |
| Explanation: 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. | |
| 130. |
The current used in the arc discharge method is about |
| A. | 100ma |
| B. | 200ma |
| C. | 300ma |
| D. | 400ma |
| Answer» A. 100ma | |
| Explanation: the current used in the arc discharge method is about 100ma. by arc | |
| 131. |
The carbon contained in the negative electrode sublimates. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: the carbon contained in the negative electrode sublimates because of high discharge temperature. this method is widely used method. | |
| 132. |
The substrate is heated to |
| A. | 200c |
| B. | 300c |
| C. | 400c |
| D. | 700c |
| Answer» D. 700c | |
| Explanation: the substrate is heated to 700c and a mixture of nitrogen and carbon containing acetylene or ethylene or ethanol or methane was passed. | |
| 133. |
A solid that offers no passage of electricity is called super conductors. |
| A. | conductance |
| B. | inductance |
| C. | resistance |
| D. | impedance |
| Answer» C. resistance | |
| Explanation: a solid that offers no resistance passage of electricity is called super conductors. they are very good conductors of electricity. | |
| 134. |
The phenomena of super conductors was first discovered by |
| A. | kammerlingh onnes |
| B. | neils bohr |
| C. | richard smalley |
| D. | otto lehman |
| Answer» A. kammerlingh onnes | |
| Explanation: 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. | |
| 135. |
The earliest superconductors to be studied elaborately is |
| A. | niobium alloy |
| B. | copper alloys |
| C. | steel alloys |
| D. | iron alloy |
| Answer» A. niobium alloy | |
| Explanation: the earliest superconductors to be studied elaborately are niobium alloy. the super conductivity can be understood with the help of quantum physics. | |
| 136. |
The shifting of electrons in super conductors is prevented by |
| A. | quantum effect |
| B. | threshold energy level |
| C. | energy barrier |
| D. | orbitals |
| Answer» A. quantum effect | |
| Explanation: the shifting of electrons in super conductors is prevented by quantum energy. | |
| 137. |
The normal metal passes into super conducting state at |
| A. | high temperature |
| B. | low temperature |
| C. | critical temperature |
| D. | no temperature |
| Answer» C. critical temperature | |
| Explanation: the normal metal passes into super conducting state at critical temperature. most of the metals act as super conductors at low temperatures. | |
| 138. |
Based on magnetic response super conductors are of types. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| Explanation: based on the magnetic response super conductors are of two types. they are ideal super conductors or hard super conductors. | |
| 139. |
The ideal super conductors exhibit |
| A. | meissner effect |
| B. | mesmeric effect |
| C. | mesomeric effect |
| D. | monomeric effect |
| Answer» A. meissner effect | |
| Explanation: 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. | |
| 140. |
This functions as a super conductor at a critical temperature of |
| A. | 30ok |
| B. | 60ok |
| C. | 90ok |
| D. | 120ok |
| Answer» C. 90ok | |
| Explanation: this functions as a super conductor at a critical temperature of 900k. charged particles in solids can travel only in fixed directions or levels. | |
| 141. |
The constituents of this material that is yttrium, barium and copper are in |
| A. | 1:1:1 |
| B. | 1:2:2 |
| C. | 1:2:3 |
| D. | 1:2:1 |
| Answer» C. 1:2:3 | |
| Explanation: the constituents of this material | |
| 142. |
Annealing the homogeneous mixture to room temperature to retain its |
| A. | composition |
| B. | structure |
| C. | its properties |
| D. | composition, structure and its properties |
| Answer» D. composition, structure and its properties | |
| Explanation: annealing the homogeneous mixture to room temperature to retain its composition, structure and its properties. | |
| 143. |
Graphite has layered structure. |
| A. | three dimensional structure |
| B. | pyramidal |
| C. | planar |
| D. | bipyramidal |
| Answer» C. planar | |
| Explanation: graphite has layered planar structure. the individual layers are called as graphene. in each layer is arranged in the honey comb lattice. | |
| 144. |
Bonding between the layers is |
| A. | strong |
| B. | weak |
| C. | very tightly bonded |
| D. | not bonded |
| Answer» B. weak | |
| Explanation: bonding between the layers is weak vander waals forces. the covalent bonds are present in between the atoms of the planes. | |
| 145. |
The graphite is anisotropic. |
| A. | highly |
| B. | lightly |
| C. | not |
| D. | very less |
| Answer» A. highly | |
| Explanation: 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. | |
| 146. |
In oxygen containing atmospheres, the graphite readily converted into |
| A. | carbon-monoxide |
| B. | carbondioxide |
| C. | carbonmonosulphide |
| D. | carbon-disulphide |
| Answer» B. carbondioxide | |
| Explanation: in oxygen containing atmospheres, the graphite readily converted into carbondioxide at temperatures of 700oc and above. | |
| 147. |
Graphite is used in the arc lamp electrode. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: graphite is a good conductor of electricity. it conducts electricity due its large de localisation of electrons. so, graphite is used in the arc lamp electrodes. | |
| 148. |
The graphite undergoes corrosion in stainless steel. |
| A. | microbial corrosion |
| B. | crevice corrosion |
| C. | pitting corrosion |
| D. | high temperature corrosion |
| Answer» C. pitting corrosion | |
| Explanation: the graphite undergoes pitting corrosion in stainless steel. the creation of the small holes on the surface of the metal is called pitting corrosion. | |
| 149. |
The graphite is |
| A. | paramagnetic |
| B. | diamagnetic |
| C. | ferromagnetic |
| D. | ferrimagnetic |
| Answer» B. diamagnetic | |
| Explanation: the graphite is diamagnetic. it will float in the mid air above the strong magnet. sometimes graphite loses its lubricating properties. | |
| 150. |
Graphite is also called as |
| A. | white lead |
| B. | black lead |
| C. | white coal |
| D. | black coal |
| Answer» B. black lead | |
| Explanation: the graphite is also called as black lead. it has another name called as the plumbago. it is used in its massive mineral form. | |
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