Solved question paper for CHEMISTRY Dec-2018 (B-TECH 1st-2nd)
Solved Question Paper
Engineering chemistry Dec-2018
PTU • B-TECH • Mechanical Engineering • 1st-2nd • Dec-2018
engineering chemistry previous year question papers on BRpaper are organized for students of Punjab Technical University’s Bachelor of Technology program, 1st-2nd semester. This section makes it easier to browse subject-wise old question papers for engineering chemistry, so students can review how questions are typically framed in past exams and get a sense of the exam pattern. Many students search for engineering chemistry previous year question paper while preparing for exams, and this page is built to support exactly that kind of subject-wise browsing and revision. BRpaper is not the official website of Punjab Technical University or any institution, and it does not publish official notices or academic updates.
PART A
1. Spectroscopy and its Applications:
An introduction UV/Visible Spectroscopy: Selection rules; Line widths and intensity of spectral lines; Principle and instrumentation; Electronic Transitions; Chromophores & auxochromes; Factors affecting λMax & intensity of spectral lines; Franck-Condon principle; Applications. IR Spectroscopy: Principle and instrumentation; Vibrational frequency; Fundamental modes of vibrations and types; Anharmonics; Factors affecting vibrational frequency; Applications. NMR Spectroscopy: Principle & instrumentation; Chemical shift; Spin-Spin Splitting; High-resolution NMR spectrum (PMR only). (7)
2. Photochemistry:
Introduction; Photo-physical & photochemical processes; Light sources in photochemistry; Beer-Lambert Law; Laws of Photochemistry; Quantum yield (primary and overall); Primary and secondary photochemical reactions; Jablonski diagram; Semiconductor photochemistry, Photovoltaic cells, Introduction to optical sensors, Introduction to supra-molecular photochemistry. (5)
3. Water and its Treatment:
Boiler feed water: Specification, Scales and sludge fermentation; Priming & foaming; Different methods of the water purifications and softening; Desalination of water; Water for domestic use: Specification; Disinfection of water.
4. Green Chemistry and its Applications:
Introductory overview - Definition and concepts of Green chemistry; Emergence of Green chemistry; Twelve principles of Green Chemistry with emphasis on the use of alternative feedstock (biofuels); Use of innocuous reagents in natural processes; Alternative solvents; Design of the safer chemicals; Designing alternative reaction methodology. Microwave and ultrasonic radiation in Green synthesis - Minimizing energy consumption. (4)
PART B
5. Corrosion and its Prevention:
Introduction; Different types of corrosion - Wet and Dry corrosion; Different types of surface films; Mechanisms of wet corrosion; Galvanic corrosion; Galvanic Series; Concentration cell corrosion and differential aeration corrosion; Soil and microbial corrosions; waterline, stress corrosions; Various methods of corrosion control. (5)
6. Polymers and Reinforced Composites:
Introduction; Functionality; Types of polymerization; Specific features of polymers; Structures - regularity and irregularity; Tacticity of polymers; Average molecular weights and size; Determination of molecular weight by number average method; Effect of molecular weight on the properties of polymers; Introduction to polymer reinforced composite. (5)
7. Nanochemistry:
Introduction; Materials self-assembly; Molecular vs. materials self-assembly; Self-assembling materials; Two-dimensional assemblies; Mesoscale self-assembly; Coercing colloids; Nanocrystals; Supramolecular structures; Nanoscale materials; Future perspectives. (5)
8. Petrochemicals:
Introduction; First, second & third generation petrochemicals; Primary Raw Materials for Petrochemicals. Natural gas: Natural gas treatment processes; Natural gas liquids; Properties of natural gas; Crude oil: Composition of crude oil- Hydrocarbon compounds; Non-hydrocarbon compounds; Metallic Compounds, Crude oil classification; Physical separation processes; Conversion processes; Production of ethylene and propylene
Solved Questions
Solved-
How can 1H NMR be used to distinguish p-CH3C6H4CH3 from C2H5C6H5?Short Answer 2 Marks Dec-2018 • PTU B-TECH
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May 2012 How 1H NMR can be used to distinguish p-CH3C6H4CH3 from C2H5C6H5 ?
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What is the range of peak identification region in IR spectrum?Short Answer 2 Marks Dec-2018 • PTU B-TECH
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May 2012 What is the range of peak identification region in IR spectrum?
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Milliequivalent per litre of hardness = ppm. Explain.Short Answer 2 Marks Dec-2018 • PTU B-TECH
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May 2012 Milliequivalent per litre of hardness = ________ ppm. Explain.
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What is photovoltaic cell?Short Answer 2 Marks Dec-2018 • PTU B-TECH
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May 2023 Write a detailed note on the construction, working and chemistry behind the photovoltaic cell.
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Dec 2017
Write a detailed note on construction, working and chemistry behind photovoltaic cell.
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May 2014 Explain photovoltaic cells.
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Dec 2011 Describe photovoltaic cells.
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What is green solvent?Short Answer 2 Marks Dec-2018 • PTU B-TECH
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What is waterline corrosion?Short Answer 2 Marks Dec-2018 • PTU B-TECH
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Dec 2016 What is waterline corrosion?
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May 2015 What is Corrosion? Discuss the factors affecting corrosion.
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May 2013 What is differential air corrosion?
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May 2013 What do you understand by stress corrosion? Explain.
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May 2013 What is wet corrosion?
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May 2013 What are the factors which affect corrosion?
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May 2012 What do you understand by Galvanic corrosion?
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May 2012 What is galvanic corrosion?
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May 2011 What is wet corrosion?
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Dec 2011 What do you understand by corrosion and stress corrosion?
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Dec 2010 What is dry corrosion?
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Dec 2010 What do you understand by wet corrosion?
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Polymers have average molecular weights. Explain.Short Answer 2 Marks Dec-2018 • PTU B-TECH
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May 2022 ‘Weight average molecular weight is higher than number-average molecular weight of a polymer’. Explain.
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Define nanochemistry.Short Answer 2 Marks Dec-2018 • PTU B-TECH
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May 2017
What is nanochemistry?
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Dec 2016 Explain nanochemistry.
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Dec 2011 What is nanochemistry?
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What can be made from petrochemicals?Short Answer 2 Marks Dec-2018 • PTU B-TECH
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May 2023 Write briefly: i) What type of primary raw material is used for petrochemicals?
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May 2017
What are the primary raw materials for petrochemical industry? How can the primary raw material be converted to usable secondary and tertiary petrochemical products?
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May 2016 What are petrochemicals? What are the primary raw materials for petrochemicals?
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What is quantum yield?Short Answer 2 Marks Dec-2018 • PTU B-TECH
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Dec 2017
Define quantum yield. Give its mathematical expression.
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May 2016 Define quantum yield.
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May 2015 Define quantum yield. What are the reasons for low and high quantum yield?
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Dec 2015 Define quantum yield.
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Dec 2012 What is quantum yield?
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Dec 2010 Discuss quantum yield.
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Dec 2008 Define quantum yield and explain with specific examples.
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Dec 2005 What do you understand by quantum yield?
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Draw a neat and well labeled diagram of UV-Visible spectrophotometer. Name the light source for UV and visible range of electromagnetic radiations in this instrument. Name the materials used as sample-holder for the UV and visible regions of electromagnetic radiations.Long Answer 4 Marks Dec-2018 • PTU B-TECH
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What do you understand by equivalent and non-equivalent protons? Explain with the help of examples.Short Answer 2 Marks Dec-2018 • PTU B-TECH
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What is the standard reference used for measuring chemical shift and why?Short Answer 2 Marks Dec-2018 • PTU B-TECH
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Define Beer-Lambert law. Derive the equation.Long Answer 4 Marks Dec-2018 • PTU B-TECH
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May 2022 What is Lambert-Beer’s Law?
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May 2016 Define Beer-Lambert’s law. What are its limitations?
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Dec 2016 Define Beer-Lambert law. Derive the equation.
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May 2014 Define and explain Grotthus-Draper law and Lambert-Beer law.
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Dec 2014 Explain Beer-Lambert Law.
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Dec 2014 Explain Beer-Lambert Law.
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Dec 2012 Define Lambert-Beer law.
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Dec 2005 Explain Beer-Lambert Law.
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A 0.003 M solution of Co(NH3)6^3+ transmits 75% of incident light of 500 nm if the path length is 1 cm. Calculate the extinction coefficient and the percent absorption for a 0.01 M solution.Long Answer 4 Marks Dec-2018 • PTU B-TECH
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Calculate the amount of soda and lime required for softening 25000 L of water. The quality control lab has reported following salts and their quantities: Ca(HCO3)2 = 15 mg, Mg(HCO3)2 = 10 mg, MgSO4 = 18 mg, CaSO4 = 20 mg, CaCl2 = 8 mg and NaCl = 4 mg. (Atomic Weight of Ca = 40, Mg = 24, Cl = 35.5, Na = 23, S = 32, O = 16, H = 1)Long Answer 5 Marks Dec-2018 • PTU B-TECH
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May 2015 Calculate the amount of lime and soda required to soften 50,000 litres of water having following analysis: Ca(HCO3)2 = 8.1 mg; Mg(HCO3)2 = 5.0 mg; CaSO4 = 13.6 mg; MgCl2 = 2.0 mg; MgSO4 = 12.0 mg; NaCl = 4.7 mg.
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May 2015 Calculate the quantity of lime and soda needed for softening 60,000 liters of water containing the following salts per liter: Ca(HCO3)2 = 8.6 mg, Mg(HCO3)2 = 7.0 mg, CaSO4 = 13.6 mg, MgSO4 = 12.3 mg, MgCl2 = 2.0 mg and NaCl = 4.9 mg.
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Dec 2014 Calculate the amount of lime and soda required for softening 90,000 liters of water containing the following salts per liter: Ca(HCO3)2 = 162 mg, CaSO4 = 136 mg and NaCl = 56.1 mg. Purity of lime is 92% and soda is 99%.
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May 2011 A water sample on analysis gave the following: Ca2+ = 30 mg/L, Mg2+ = 24 mg/L, CO3 = 32 mg/L, HCl = 50 mg/L, K = 10 mg/L. Calculate the quantities of lime (purity 90%) and soda (purity 94%) required to soften one million litres of water.
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May 2011 A water sample contains 40 ppm of Ca2+, 36 ppm of Mg2+, 48 ppm of SO4^2- and 366 ppm of HCO3-. Calculate the amount of lime and soda needed for softening.
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Dec 2011 Calculate the quantity of lime and soda needed for softening 50,000 litres of water containing the following salts per litre: Ca(HCO3)2 = 8.1 mg; Mg(HCO3)2 = 7.5 mg; CaSO4 = 13.6 mg; MgSO4 = 12.0 mg; MgCl2 = 2.0 mg and NaCl = 4.7 mg.
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Dec 2007 Calculate the amount of lime (91% pure) and soda (97.2% pure) required for softening one million litres of water containing H+ (free acidity) = 1.5 ppm; HCO3- = 396.5 ppm; Mg2+ = 42 ppm; Ca2+ = 90 ppm; FeSO4.7H2O = 14 ppm.
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May 2005 A sample of water was analyzed and found to contain temporary magnesium hardness 25 mg/lit. Permanent magnesium chloride hardness is 15 mg/lit and permanent calcium sulphates hardness 20 mg/lit. SiO2 = 300 mg/lit. Calculate the lime and soda required for softening 30,000 liters of hard water.
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What advantages does the use of ion-exchange resin provide over zeolite process for softening of hard water?Short Answer 3 Marks Dec-2018 • PTU B-TECH
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May 2019 What advantages does the use of ion-exchange resin provide over zeolite process for softening of hard water?
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What is atom economy? How is it different from percentage yield?Short Answer 4 Marks Dec-2018 • PTU B-TECH
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What are ultrasounds? How ultrasound waves can help the chemical reaction?Short Answer 4 Marks Dec-2018 • PTU B-TECH
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Dec 2016 What are ultrasounds? How ultrasound waves can help the chemical reaction?
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How corrosion can be prevented by proper designing?Short Answer 4 Marks Dec-2018 • PTU B-TECH
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Dec 2023 What do you understand by wet and dry corrosion? How the corrosion can be prevented?
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May 2022 What are the different methods of controlling corrosion? Explain sacrificial anodic protection method.
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May 2020 What are the various methods that need to be followed to control corrosion?
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May 2014 What are the protective measures against corrosion? Discuss.
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Discuss the mechanism of wet corrosion.Long Answer 4 Marks Dec-2018 • PTU B-TECH
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May 2020 Explain the mechanism of galvanic corrosion.
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May 2020 Explain the mechanism of wet corrosion.
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May 2019 Discuss the chemistry and mechanism of wet corrosion.
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Dec 2017
Explain the mechanism of electrochemical corrosion with example.
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May 2016 What is corrosion? Explain electrochemical theory of corrosion.
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May 2016 Explain differential metal corrosion.
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Dec 2016 Explain differential aeration corrosion.
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Dec 2016 Give the cause of corrosion.
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May 2015 Explain waterline corrosion.
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May 2015 Explain stress corrosion.
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May 2015 Explain the mechanism of electrochemical corrosion.
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Dec 2015 Describe sacrificial anodic method for corrosion prevention with an example.
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May 2014 Define corrosion. Discuss the mechanism of wet corrosion.
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May 2012 Explain the mechanism of wet corrosion.
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Dec 2012 Describe the mechanism of electrochemical corrosion.
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Dec 2012 Explain dry corrosion.
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Dec 2012 Describe the mechanism of electrochemical corrosion.
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May 2011 Discuss the mechanism of wet corrosion.
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Dec 2011 Discuss mechanism of wet corrosion.
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May 2008 What is corrosion of metals? Explain electro-chemical corrosion with its mechanism.
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Dec 2008 Explain the type of corrosion with evolution of hydrogen ions.
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May 2007 Discuss briefly: Galvanic corrosion
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Dec 2007 Explain briefly galvanic cell corrosion.
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Dec 2007 Explain briefly pitting corrosion.
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Dec 2006 Discuss briefly Galvanic corrosion.
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What do you understand by tacticity? How can it affect the properties of polymers?Short Answer 4 Marks Dec-2018 • PTU B-TECH
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Dec 2023 Explain the Tacticity of Polymers.
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Dec 2017
What is meant by tacticity of polymers?
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May 2016 How polymers are classified on the basis of tacticity?
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Dec 2016 What do you understand by tacticity? How it can affect the properties of polymers?
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May 2015 What are atactic polymers?
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Dec 2011 What do you understand by tacticity in polymers? Explain different types.
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If 1000 g of a polymer with molecular weight 1000 g/mol and 1000 g of another polymer with molecular weight 10^6 g/mol are mixed, calculate the polydispersity index of the polymer.Long Answer 4 Marks Dec-2018 • PTU B-TECH
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Describe two dimensional assemblies.Short Answer 4 Marks Dec-2018 • PTU B-TECH
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May 2023 Write a short note on the following: a) Two dimensional assemblies
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Dec 2016 Describe two dimensional assemblies.
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What are nanoscale materials? Why are nanoparticles so important?Short Answer 4 Marks Dec-2018 • PTU B-TECH
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Dec 2016 What are nanoscale materials? How these are useful?
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May 2014 What are nanomaterials?
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May 2013 What do you understand by nanotechnology?
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Dec 2012 What are nanomaterials?
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What is the composition of crude oil? Discuss various petroleum products that come from crude oil.Short Answer 4 Marks Dec-2018 • PTU B-TECH
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May 2022 What is the composition of crude oil? Also, classify the crude oil in different categories.
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May 2020 Write a short note on classification of crude oil.
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May 2019 How will you classify crude oil?
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May 2019 Describe the composition of crude oil, emphasising on hydrocarbon and non-hydrocarbon components present in it.
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Dec 2016 Describe the composition of crude oil.
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May 2015 What is crude oil? Give composition and classification of crude oil.
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Dec 2012 What is Crude Oil? Give its composition and classification.
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What are petrochemicals? Discuss second generation petrochemicals.Short Answer 4 Marks Dec-2018 • PTU B-TECH
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May 2017
Write a brief note on second generation petrochemicals. Give examples.
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May 2015 Discuss third generations petrochemicals by giving suitable examples.
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Dec 2012 Describe the second generation petrochemicals. Discuss giving examples.
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FAQ
Frequently Asked Questions
Answers about this subject, solved papers, and preparation.
01 Where can I find engineering chemistry previous year question papers for Bachelor of Technology, 1st-2nd semester?
This page lists engineering chemistry question papers uploaded for Punjab Technical University Bachelor of Technology, 1st-2nd semester, organized for subject-wise browsing where available.
02 Are these official Punjab Technical University question papers?
BRpaper is not the official website of Punjab Technical University. These papers are shared for reference and revision purposes only and are not official university material.
03 How can previous year engineering chemistry papers help in exam preparation?
Reviewing past papers can help you understand how questions are typically framed, notice commonly repeated topics, and get a sense of the exam pattern before your own exam.
04 What kind of topics does engineering chemistry usually cover?
The question papers here relate to the official engineering chemistry syllabus set by the university for this course and semester.
05 Does this page include a engineering chemistry previous year question paper or solved answers?
This page focuses on providing access to the previous year question papers themselves. A separate question bank or solved answers may not be available for every paper.
06 Can I find papers for other subjects in the same Bachelor of Technology?
Yes, BRpaper organizes papers by university, course, stream, and semester, so you can browse other subjects within the same Punjab Technical University Bachelor of Technology.