Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

1.

If pn-junctions were built with nano wires then the next step is to build _________(a) Transistors(b) Logic gates(c) Resistors(d) TransducersThis question was posed to me in unit test.Query is from Nano Wires and Nano Cones in section Nano Materials of Applied Chemistry

Answer»

Right ANSWER is (B) Logic GATES

Easiest explanation: If pn-junctions were built with nano wires then the next step is to BUILD logic gates. By connecting SEVERAL pn-junction diodes the logic gates are produced.

2.

Sol-gel method is known since ____________(a) 1970(b) 1960(c) 1980(d) 1990The question was asked in an interview for internship.Asked question is from Sol-Gel Method and Chemical Reduction Method in section Nano Materials of Applied Chemistry

Answer» CORRECT option is (c) 1980

Best EXPLANATION: Sol-gel METHOD is known since 1980s. The technic is rediscovered in early 1970s when the glasses were PRODUCED without high temperature melting processes.
3.

The ideal super conductors exhibit __________(a) Meissner effect(b) Mesmeric effect(c) Mesomeric effect(d) Monomeric effectThis question was addressed to me during an internship interview.Origin of the question is Super Conductors topic in division Nano Materials of Applied Chemistry

Answer»

The correct choice is (a) MEISSNER EFFECT

Easy 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.

4.

To improve the composite of graphite _______ is used as a catalyst.(a) CO(b) NI(c) CO and NI(d) TIOThis question was posed to me in semester exam.The question is from Carbon Nano Tubes topic in division Nano Materials of Applied Chemistry

Answer»

Right OPTION is (c) CO and NI

For EXPLANATION: To IMPROVE the COMPOSITE of graphite CO and NI mixture is used as catalyst. They are used to synthesise the single walled CNT.

5.

The distance between the planes of the graphite is _________(a) 0.876nm(b) 0.223nm(c) 0.124nm(d) 0.335nmThe question was asked in quiz.My query is from Graphite topic in section Nano Materials of Applied Chemistry

Answer» CORRECT option is (d) 0.335nm

Best explanation: The distance between the PLANES is 0.335nm. ATOMS in the PLANE are bonded covalently with three of the four potential bonding sites SATISFIED.
6.

C60 is oxidised to form _______(a) C60O22(b) C60O24(c) C60O23(d) C60OI had been asked this question in an online quiz.I want to ask this question from Fullerenes and their Properties topic in chapter Nano Materials of Applied Chemistry

Answer»

Right choice is (d) C60O

The explanation: C60O is formed when the C60 is oxidised. If it is mixed with DISULPHIDE, the radical is forms SPONTANEOUSLY, whose stability DEPENDS on steric FACTORS.

7.

The boron bucky balls find potential use in __________(a) Diagnostics(b) Fuel(c) Fossils(d) LaboratoriesThis question was addressed to me in quiz.This interesting question is from Fullerenes and their Properties in division Nano Materials of Applied Chemistry

Answer» CORRECT answer is (a) DIAGNOSTICS

The EXPLANATION: The boron bucky balls FIND potential use in diagnostics. The boron bucky balls can also find potential use in THERAPEUTICS and organic solar cells.
8.

The boron bucky ball has _______ metal atoms.(a) 1(b) 2(c) 3(d) 4This question was posed to me by my school principal while I was bunking the class.My doubt stems from Fullerenes and their Properties in portion Nano Materials of Applied Chemistry

Answer»

The CORRECT ANSWER is (C) 3

To EXPLAIN I would say: The boron bucky balls have 80 CARBON atoms forming a sphere which encloses a complex of three metal atoms and one nitrogen atom.

9.

The transparent colourless solution solution is changed into pale yellow from ___________ in chemical reduction method.(a) pale blue(b) Purple(c) Pale red(d) Dark brownThis question was addressed to me during an online exam.This intriguing question comes from Sol-Gel Method and Chemical Reduction Method in portion Nano Materials of Applied Chemistry

Answer»

Correct answer is (C) Pale RED

For explanation I WOULD say: The transparent colourless solution is changed into pale yellow from pale red in the chemical reduction method. Later the dried powder of nano powder of nano SILVER is OBTAINED by freeze drying.

10.

Carbon nano tubes are also called as ________(a) Bucky tubes(b) Bulky tubes(c) Bulk tubes(d) Buck ballsI had been asked this question in an interview.This interesting question is from Carbon Nano Tubes topic in chapter Nano Materials of Applied Chemistry

Answer»

Right option is (a) Bucky tubes

For 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.

11.

Fullerenes are stable with __________ hybridization.(a) sp(b) sp^2(c) sp^3(d) sp^4This question was addressed to me in an online interview.My doubt stems from Fullerenes and their Properties topic in portion Nano Materials of Applied Chemistry

Answer»

Correct choice is (b) sp^2

The EXPLANATION: Fullerenes are STABLE with sp^2 hybridization of carbon ATOMS. The REACTIVITY is increased by ATTACHING active groups in their surfaces.

12.

Fabrics are extensively made out of nano materials like ___________(a) Carbon nano tubes(b) Fullerenes(c) Mega tubes(d) PolymersThis question was posed to me in an internship interview.My question comes from Applications of Nano Materials topic in chapter Nano Materials of Applied Chemistry

Answer»

Correct ANSWER is (b) Fullerenes

To explain I would say: Fabrics are EXTENSIVELY made out of NANO materials like fullerenes. The sports GOODS and CLEANING products are also made out of them.

13.

CNT is _________(a) Non toxic(b) Toxic(c) Very Safe(d) Not having grapheneThe question was asked in an international level competition.Question is from Properties and Uses of CNT in chapter Nano Materials of Applied Chemistry

Answer»

Right option is (b) Toxic

To explain: CNT is toxic. At some CONDITIONS it crosses the membrane barriers and reach organs which includes harmful EFFECTS like inflammatory.

14.

Bonding between the layers is _________(a) Strong(b) Weak(c) Very tightly bonded(d) Not bondedI got this question in homework.The question is from Graphite in section Nano Materials of Applied Chemistry

Answer» RIGHT answer is (b) Weak

Easiest EXPLANATION: Bonding between the LAYERS is weak VANDER waals forces. The covalent bonds are present in between the ATOMS of the planes.
15.

DNA detection through the ___________ by using the oligonucleotide functionalised gold nano crystals is developed.(a) Colorimetric(b) Diathermy(c) Electro therapy(d) Treatment tablesThis question was addressed to me in homework.My doubt stems from Applications of Nano Materials in section Nano Materials of Applied Chemistry

Answer»

The correct OPTION is (a) Colorimetric

The best EXPLANATION: DNA DETECTION through the colorimetric technique by USING the oligonucleotide functionalised gold nano crystals is developed. The nano particles are where anti bodies react and binds the hormone and move rapidly.

16.

__________ undergo hydrolysis and poly condensation reactions.(a) Metal ions(b) Metal carbonates(c) Metal nitrates(d) Metal oxidesThis question was posed to me at a job interview.My question comes from Sol-Gel Method and Chemical Reduction Method in portion Nano Materials of Applied Chemistry

Answer»

Correct ANSWER is (d) Metal oxides

To EXPLAIN: Metal oxides or metal CHLORIDES undergo hydrolysis and poly CONDENSATION reactions to FORM a collide which is a system composed of nano particles dispersed in a solvent.

17.

Preparation of super conductors by ceramic method by homogeneous mixture of the oxides __________ in their molar ratios.(a) Y2O3, BaCO3, CuO(b) Y2O3, BaCO3, Cu2O(c) Y2O4, BaCO3, CuO(d) YO3, BaCO3, CuOThe question was posed to me in an interview.My question is from Super Conductors in section Nano Materials of Applied Chemistry

Answer» RIGHT OPTION is (a) Y2O3, BaCO3, CuO

Easy explanation: Preparation of super conductors by ceramic METHOD by homogeneous mixture of the OXIDES Y2O3, BaCO3, CuO in their MOLAR ratios.
18.

The shifting of electrons in super conductors is prevented by _________(a) Quantum effect(b) Threshold energy level(c) Energy barrier(d) OrbitalsThis question was posed to me in homework.My query is from Super Conductors in division Nano Materials of Applied Chemistry

Answer»

Right option is (a) QUANTUM effect

Explanation: The shifting of electrons in super conductors is prevented by quantum energy. Electrons in normal METALS shift from one energy LEVEL to ANOTHER.

19.

Based on magnetic response super conductors are of __________ types.(a) 1(b) 2(c) 3(d) 4I have been asked this question in an online quiz.Query is from Super Conductors topic in section Nano Materials of Applied Chemistry

Answer»

The correct choice is (b) 2

Explanation: BASED on the MAGNETIC response SUPER CONDUCTORS are of two TYPES. They are ideal super conductors or hard super conductors.

20.

The earliest superconductors to be studied elaborately is ________(a) Niobium alloy(b) Copper alloys(c) Steel alloys(d) Iron alloyThis question was posed to me in an interview for internship.The above asked question is from Super Conductors in chapter Nano Materials of Applied Chemistry

Answer»

The correct OPTION is (a) Niobium alloy

Easy explanation: The earliest superconductors to be studied ELABORATELY are niobium alloy. The super conductivity can be understood with the HELP of QUANTUM PHYSICS.

21.

The fullerenes are extracted from soot using __________(a) Single step procedure(b) Two step procedure(c) Three step procedure(d) Multi step procedureI got this question in an interview for job.This is a very interesting question from Fullerenes and their Properties topic in division Nano Materials of Applied Chemistry

Answer»

The correct CHOICE is (d) Multi step procedure

For explanation I would say: The fullerenes are EXTRACTED from soot using multi step PROCESS. The PREPARATION is usually done by applying the large current between the GRAPHITE rods.

22.

Plasma torch method is used in the year ________(a) 2005(b) 2004(c) 2002(d) 2001The question was asked in final exam.The origin of the question is Carbon Nano Tubes topic in division Nano Materials of Applied Chemistry

Answer»

Correct choice is (a) 2005

The BEST I can explain: Plasma TORCH method is USED in the year 2005 at national research council of Canada. It is used to make the single WALLED CNT.

23.

The first molecule was prepared in ___________(a) 1988(b) 1985(c) 1996(d) 1982I got this question in examination.I need to ask this question from Fullerenes and their Properties topic in chapter Nano Materials of Applied Chemistry

Answer»

The correct option is (c) 1996

The explanation is: The first molecule was prepared in 1985 by Richard Smalley etal at rice UNIVERSITY, USA. They were awarded with noble PRIZE in 1996. The name fullerene is given as homage to buckminister fullerene.

24.

The fullerenes are composed with _________(a) Graphene sheets(b) Graphite(c) Lead(d) Other carbon materialsThe question was posed to me during a job interview.My question is taken from Fullerenes and their Properties in chapter Nano Materials of Applied Chemistry

Answer»

Right answer is (a) Graphene SHEETS

The explanation: The fullerenes are composed with stalked graphene sheets. The fullerenes are similar to the STRUCTURE of graphite. The only difference is they can be N sphere, tube or ELLIPSOID but graphene is layers.

25.

The extensively used nano particles as catalyst is_________(a) Silver(b) Copper(c) Gold(d) CeriumI have been asked this question during an internship interview.This interesting question is from Applications of Nano Materials topic in division Nano Materials of Applied Chemistry

Answer»

Right answer is (c) Gold

Easiest explanation: The EXTENSIVELY USED nano particles as CATALYST are gold. Some of them are molybdenum, cerium oxide and nickel.

26.

Nano particles target the rare _______ causing cells and remove them from blood.(a) Tumour(b) Fever(c) Infection(d) ColdThe question was posed to me in a national level competition.Asked question is from Applications of Nano Materials in chapter Nano Materials of Applied Chemistry

Answer»

Correct ANSWER is (a) Tumour

For explanation: Nano particles target the rare tumour causing cells and remove them completely from the BLOOD stream. They are ALSO USED in the MANY other drugs.

27.

Coating the nano crystals with the ceramics is carried that leads to ________(a) Corrosion(b) Corrosion resistant(c) Wear and tear(d) SoftI got this question in class test.Asked question is from Applications of Nano Materials in section Nano Materials of Applied Chemistry

Answer» CORRECT OPTION is (b) Corrosion resistant

The explanation is: Coating the nano crystals with the ceramics is carried that leads to the corrosion resistant and hard and WEAR resistant and AMBIENT DUCTILITY.
28.

The nano materials are used in the light emitted electro luminescence devices.(a) True(b) FalseThis question was posed to me by my college director while I was bunking the class.Query is from Applications of Nano Materials topic in section Nano Materials of Applied Chemistry

Answer»

Right OPTION is (a) True

To explain I would say: The nano particles are USED in the light electro luminescence DEVICES. The find APPLICATION in flat panel display technologies like television, computer monitor, etc.

29.

The ___________ and citrate solution are used as reducing agents in chemical reduction method.(a) Hydrazine hydrate(b) Hydrazine(c) Hydrazone(d) Semi carbazeneI got this question in an internship interview.My question is from Sol-Gel Method and Chemical Reduction Method topic in chapter Nano Materials of Applied Chemistry

Answer» RIGHT option is (a) Hydrazine hydrate

Explanation: The hydrazine hydrate and citrate SOLUTION are used as reducing AGENTS in CHEMICAL reduction method. The hydrazine hydrate is of 2-12ppm and citrate solution of 1PPM is used.
30.

One of the advantages of sol-gel method is able to get uniform and _________ powder.(a) Micro size(b) Large size(c) Nano size(d) Small sizeThe question was posed to me in semester exam.My doubt is from Sol-Gel Method and Chemical Reduction Method topic in portion Nano Materials of Applied Chemistry

Answer»

The correct option is (d) Small SIZE

To explain I would SAY: One of the advantages of sol-gel method is able to get uniform and small size powder. Another advantage of sol-gel method is to get NEW micro STRUCTURE and COMPOSITION at low temperature.

31.

The carbon contained in the negative electrode sublimates.(a) True(b) FalseThe question was posed to me in an interview.My query is from Carbon Nano Tubes topic in division Nano Materials of Applied Chemistry

Answer» RIGHT option is (a) True

The best I can explain: The carbon CONTAINED in the negative electrode sublimates because of HIGH discharge TEMPERATURE. This METHOD is widely used method.
32.

The phenomena of super conductors was first discovered by ___________(a) Kammerlingh Onnes(b) Neils bohr(c) Richard Smalley(d) Otto lehmanThe question was posed to me in examination.This intriguing question originated from Super Conductors in chapter Nano Materials of Applied Chemistry

Answer»

Right choice is (a) Kammerlingh Onnes

For explanation I would SAY: 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.

33.

The graphite is _________ anisotropic.(a) Highly(b) Lightly(c) Not(d) Very lessThe question was asked in a national level competition.My enquiry is from Graphite topic in portion Nano Materials of Applied Chemistry

Answer»

Right answer is (a) HIGHLY

The 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.

34.

The same composition produced at ______ when the C60 is ozonated.(a) 250K(b) 257K(c) 300K(d) 296KThe question was asked in an international level competition.Enquiry is from Fullerenes and their Properties in section Nano Materials of Applied Chemistry

Answer»

Correct answer is (d) 296K

For explanation I would say: The same COMPOSITION produced at 296K when C60 is ozonated. The compound decomposes at 257 K into TWO FORMS of C60O.

35.

When a method is used as an inclusion compound it is __________(a) Metallo fullerene(b) Non metallic fullerene(c) Buckminister fullerene(d) Boron bucky ballsI have been asked this question in a job interview.Question is taken from Fullerenes and their Properties in section Nano Materials of Applied Chemistry

Answer»

The CORRECT answer is (a) METALLO fullerene

Easy explanation: When a method is USED as an inclusion compound it is CALLED as metallo fullerene. One of the EXAMPLES is steel.

36.

For nano metres whose diameters less than ________ are used as welding purposes.(a) 10nm(b) 20nm(c) 30nm(d) 40nmI got this question during an interview.This question is from Nano Wires and Nano Cones topic in section Nano Materials of Applied Chemistry

Answer»

Right ANSWER is (a) 10nm

For explanation I would SAY: For NANO metres whose diameter is LESS than that of 10nm is mostly used for welding purposes. This REQUIRES precise control of heating mechanism.

37.

The __________ to the ceramics are superior coatings.(a) Nano particles(b) Nano powder(c) Nano crystals coating(d) Nano gelThe question was asked in a national level competition.Query is from Applications of Nano Materials topic in chapter Nano Materials of Applied Chemistry

Answer» RIGHT choice is (C) Nano crystals coating

Best EXPLANATION: The nano particles coatings to the ceramics are superior coatings. They make the ceramics CORROSION resistant.
38.

CNT can be used for coating and absorption on the surface _______(a) Fibre(b) Design(c) Stains(d) MarksThis question was addressed to me by my college professor while I was bunking the class.I'm obligated to ask this question of Properties and Uses of CNT topic in chapter Nano Materials of Applied Chemistry

Answer»

Right choice is (a) Fibre

The best EXPLANATION: CNT is also USED in textiles. It can be used for coating and ABSORPTION on the surface fibre for manufacturing fabric which is ANTI BACTERIAL.

39.

The substrate is heated to ________(a) 200C(b) 300C(c) 400C(d) 700CThe question was posed to me in a national level competition.The query is from Carbon Nano Tubes topic in section Nano Materials of Applied Chemistry

Answer»

Right CHOICE is (d) 700C

Easy EXPLANATION: The SUBSTRATE is heated to 700C and a mixture of nitrogen and carbon containing acetylene or ethylene or ETHANOL or methane was PASSED.

40.

In how many methods the CNT can be prepared?(a) 1(b) 2(c) 3(d) 4I have been asked this question in exam.This question is from Carbon Nano Tubes topic in section Nano Materials of Applied Chemistry

Answer»

The CORRECT CHOICE is (d) 4

The explanation is: 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.

41.

When the other atoms tapped inside fullerenes to form inclusion compounds is known as ________(a) Exohedral fullerenes(b) Endohedral fullerenes(c) Exothermic fullerenes(d) Endothermic fullerenesI got this question in an internship interview.This intriguing question originated from Fullerenes and their Properties in portion Nano Materials of Applied Chemistry

Answer»

Right option is (b) Endohedral FULLERENES

To explain: When the other ATOMS tapped inside fullerenes to form inclusion compounds is KNOWN as endohedral fullerenes. The example is Tb3NeC84 which is egg SHAPED fullerene.

42.

A fullerene is any molecule composed entirely of the carbon not in the form of hollow ________(a) Sphere(b) Tube(c) Ellipsoid(d) CuboidI got this question in examination.I want to ask this question from Fullerenes and their Properties in division Nano Materials of Applied Chemistry

Answer» RIGHT answer is (d) Cuboid

To ELABORATE: A fullerene is any molecule composed entirely of CARBON not in the form of cuboid. Generally, the fullerenes are in the form of spherical, ELLIPSOID or tube.
43.

Mega tubes are used for __________(a) Transport(b) Chemical industries(c) Laboratories(d) Preparation of compoundsI had been asked this question during an interview.My question comes from Fullerenes and their Properties topic in portion Nano Materials of Applied Chemistry

Answer»

Correct option is (a) Transport

The best 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.

44.

While synthesizing the nano cones the plasma temperature is above _________(a) 1000^oC(b) 1500^oC(c) 2000^oC(d) 2500^oCI had been asked this question during an interview.My question is taken from Nano Wires and Nano Cones in section Nano Materials of Applied Chemistry

Answer»

The CORRECT OPTION is (C) 2000^oC

To elaborate: While synthesizing the nano cones the PLASMA temperature is above 2000^oC. In industrial process it is PRODUCED and decomposes the hydro carbons into carbon.

45.

A solid that offers no _________ passage of electricity is called super conductors.(a) Conductance(b) Inductance(c) Resistance(d) ImpedanceThis question was posed to me at a job interview.This interesting question is from Super Conductors topic in section Nano Materials of Applied Chemistry

Answer»

The CORRECT option is (c) Resistance

The best explanation: A SOLID that offers no resistance passage of ELECTRICITY is called super conductors. They are very GOOD conductors of electricity.

46.

CNT posses strength up to ________(a) 100Gpa(b) 200Gpa(c) 400Gpa(d) 300GpaI have been asked this question in homework.The doubt is from Properties and Uses of CNT in division Nano Materials of Applied Chemistry

Answer» CORRECT OPTION is (a) 100Gpa

To explain I would SAY: CNT posses STRENGTH up to 100Gpa. Chemical vapour decomposition is mostly used because of its low cost and direct growth of catalyst on SURFACE.
47.

Which of the following are the super conducting wires?(a) YBCO(b) Ni(c) Pt(d) AuI had been asked this question in unit test.My query is from Nano Wires and Nano Cones topic in chapter Nano Materials of Applied Chemistry

Answer»

The CORRECT OPTION is (a) YBCO

The BEST I can explain: The super conducting nano wires are YBCO. The metallic nano wires are Ni, Pt and Au. The semi conducting nano wires are INS, GAN and silicon wires.

48.

CNT s are the strongest and stiffest materials in ___________(a) Tensile strength(b) Ductility(c) Elasticity(d) EnergyI have been asked this question during an internship interview.I'd like to ask this question from Properties and Uses of CNT topic in portion Nano Materials of Applied Chemistry

Answer»

The correct answer is (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.

49.

Sol-gel method can produce __________ systems.(a) Uniform multi component(b) Non uniform multi component(c) Multi component(d) Non uniform multi componentThe question was posed to me in exam.The doubt is from Sol-Gel Method and Chemical Reduction Method topic in division Nano Materials of Applied Chemistry

Answer»

Correct answer is (a) UNIFORM MULTI component

Easiest explanation: Sol-gel method can PRODUCE uniform multi component systems. BETTER control over the reactions is one of the ADVANTAGES of sol-gel method.

50.

For high sensitivity or selectivity environmental sensors to sense the gaseous chemical like _________(a) CO2(b) NO3(c) O2(d) NOThis question was posed to me by my college director while I was bunking the class.This intriguing question comes from Applications of Nano Materials topic in portion Nano Materials of Applied Chemistry

Answer»

The correct option is (d) NO

Easy explanation: For high sensitivity or SELECTIVITY environmental SENSORS to sense the GASEOUS chemical like NO. The other GASES are that are to be sensed is CO, NO, NO2 and O3 in high traffic environments are fabricated.