Unit 2 - Practice Quiz

1 Which of the following equations correctly represents the relationship between the number average molecular weight of a polymer (), the molecular weight of the monomer (), and the degree of polymerization ()?

2 Which of the following polymers is classified as an inorganic polymer?

3 Based on the mechanism of polymerization, Nylon 6,6 is an example of which type of polymer?

4 Which molecular structure generally results in a polymer with high density, high melting point, and high tensile strength due to efficient packing?

5 What is the term used to describe a polymer where the substituent groups are arranged randomly along the polymer chain?

6 How does the degree of crystallinity in a polymer affect its chemical resistance?

7 The temperature below which a polymer becomes hard, brittle, and glassy, and above which it becomes soft and rubbery, is known as:

8 Which of the following factors generally decreases the Glass Transition Temperature () of a polymer?

9 How does the presence of bulky/rigid side groups (like phenyl in Polystyrene) affect ?

10 Which of the following is the monomer unit for Natural Rubber?

11 The process of heating natural rubber with sulfur to improve its elasticity and strength is called:

12 Buna-S is an elastomer formed by the copolymerization of:

13 Which polymer is commonly known as Teflon and possesses high thermal stability and non-stick properties?

14 What is the primary application of Poly(methyl methacrylate) (PMMA)?

15 Which of the following is a condensation polymer used prominently in electrical switches and handles due to its thermosetting nature?

16 Which of the following is a biodegradable polymer?

17 Polyhydroxybutyrate (PHB) belongs to which class of polymers?

18 What is the primary mechanism for the degradation of biodegradable polymers like Poly(glycolic acid) (PGA) in the body?

19 Which polymer is commonly used for making biodegradable surgical sutures?

20 Conducting polymers primarily owe their electrical conductivity to:

21 Which was the first conducting polymer discovered, treated with iodine vapor?

22 The process of adding an oxidizing or reducing agent to a conjugated polymer to increase its conductivity is called:

23 In the context of conducting polymers, p-doping involves:

24 Which charge carrier is formed when an electron is removed from a polymer chain with a non-degenerate ground state (like Polypyrrole), creating a radical-cation?

25 Which charge carrier is unique to polymers with a degenerate ground state (like trans-polyacetylene)?

26 When two polarons combine in a conducting polymer, they form a spinless dication called a:

27 How does doping affect the energy band gap of a conjugated polymer?

28 Which of the following is a common application of conducting polymers?

29 What is the primary function of a lubricant?

30 Which mechanism of lubrication occurs when the lubricant film is thick enough to completely separate the moving surfaces (fluid film lubrication)?

31 Boundary lubrication is required when:

32 Which additives are used in lubricants to prevent metal-to-metal contact under very high loads and temperatures?

33 What does a high Viscosity Index (VI) indicate about a lubricating oil?

34 The lowest temperature at which an oil gives off enough vapor to ignite momentarily when a flame is brought near is called:

35 The temperature at which a lubricating oil ceases to flow or pour is known as:

36 Graphite acts as a solid lubricant because:

37 Which chemical property of a lubricant is determined by the amount of KOH (in mg) required to neutralize the free acid in 1 gram of oil?

38 Molybdenum disulfide () is an example of:

39 What is the specific role of anti-oxidants as lubricant additives?

40 The 'Cloud Point' of a lubricant is the temperature at which:

41 In the synthesis of Silicone polymers, hydrolysis of dichlorosilane () followed by condensation yields:

42 Which of the following best describes the structure of High Density Polyethylene (HDPE)?

43 Which of the following is NOT a factor affecting the Glass Transition Temperature ()?

44 Polyvinyl Chloride (PVC) is synthesized via which mechanism?

45 What is the primary charge transport mechanism in conducting polymers?

46 Why are biodegradable polymers like Polycaprolactone (PCL) used in drug delivery systems?

47 Which lubricant property is defined as the resistance of a liquid to flow?

48 Which of the following is an example of an addition polymer?

49 What is the role of dopants like or in polyacetylene?

50 An emulsion of oil and water (semi-solid) used as a lubricant is typically known as: