Material Science week 4

9. What type of steel has carbon as its principal hardening agent? A. Alloy steel B. Stainless steel C. Galvanized steel D. Carbon steel

A. Alloy steel

21. What refers to a shape achieved by allowing a liquid to solidify in a mold? A. Casting B. Molding C. Forming D. All of the choices

A. Casting

13. Which of the following cast irons is a high-carbon-silicon alloy? A. Gray iron B. Malleable iron C. White iron D. Alloy iron

A. Gray iron

6. What do you call a polymer without additives and without blending with another polymer? A. Homo polymer B. Ethenic polymer C. Polyethylene D. Copolymer

A. Homo polymer

4. Some polymetric materials such as epoxies are formed by strong primary chemical bonds called ________. A. Metallic bond B. Van der Waals bond C. Cross linking D. Covalent bond

A. Metallic bond

35. Which one of the following materials is a ceramic material? A. Mica B. Copper C. Antimony D. Zinc sulphide

A. Mica

36. What is the most dominant constituent of cement? A. Silica B. Lime C. Alumina D. Magnesia

A. Silica

8. What is defined as an alloy of iron and carbon, with the carbon being restricted within certain concentration limits? A. Steel B. Wrought Iron C. Cast Iron D. Tendons

A. Steel

25. Porcelain is a type of ______ ceramic. A. whiteware B. stone C. abrasive D. cement

A. whiteware

17. Iron is said to be abundant in nature. About how many percent of the earth's crust is iron? A. 10% B. 5% C. 20% D. 8%

B. 5%

33. Which ceramics used in the medicine, electrical, electronics industries, and body armor? A. Crystalline ceramics B. Advanced ceramics C. Non-crystalline ceramics D. None of the above

B. Advanced ceramics

10. What type of steel has 0.8% carbon and 100% pearlite? A. Austenite B. Eutectoid C. Hyper-eutectoid D. Stainless steel

B. Eutectoid

23. What refers to glasses which are devitrified about 100oC below their softening point to form a very fine network of crystalline phase? A. Fused silica B. Glass ceramics C. Fused quartz D. Fiber glass

B. Glass ceramics

14. Which of the following cast irons is heat-treated for ductility? A. Gray iron B. Malleable iron C. White iron D. Ductile iron

B. Malleable iron

12. The use of acids to remove oxides and scale on hot-worked steels is known as_______. A. Tempering B. Pickling C. Machining D. Galvanizing

B. Pickling

2. The engineering materials known as "plastics" are more correctly called ____________. A. Polyvinyl chloride B. Polymers C. Polyethylene D. Mers

B. Polymers

16. What is the effect of aluminum in cast iron? A. To increase hardness above 0.5% B. To deoxidize molten cast iron C. To affect machinability, ductility, and shrinkage depending on form D. To reduce hardness by combining with sulfur below 0.5%

B. To deoxidize molten cast iron

39. The number of repeating units in a polymer is known as __________ A. monomer B. degree of polymerization C. molecule D. chain

B. degree of polymerization

31. During sintering densification is not due to A. atomic diffusion B. surface diffusion C. bulk diffusion D. grain growth

B. surface diffusion

19. A type of stereoisomerism in which atoms are linked in the same order but randomly positioned. A. Isotatic B. Syndiotactic C. Actactic D. none of these

C. Actactic

27. Which of the following is not a step in making ceramics? A. Powder pressing B. Sintering C. Alloying D. Vitrification

C. Alloying

20. A type of copolymer in which identical repeat units are clustered along the chain A. Random copolymer B. Alternating copolymer C. Block copolymer D. Graft copolymer

C. Block copolymer

3. What is the generic name of class of polymer which is commercially known as "nylon"? A. Polyacetals B. Polyamide C. Cellulose D. Polyester

C. Cellulose

37. Which of the following bonds are present in ceramic structures? A. Ionics bonds only B. Covalent bonds only C. Ionic, covalent and a mix of ionic and covalent bond D. Mix of ionic and covalent bond only

C. Ionic, covalent and a mix of ionic and covalent bond

40. Steel is a material that is primarily made of ____________ and _________ A. titanium, carbon B. Chromium, iron C. Iron, carbon D. Iron, titanium

C. Iron, carbon

24. Which of the following is a property of ceramics? A. Low strength B. Low melting point C. Resistant to corrosion D. Bad insulation

C. Resistant to corrosion

5. What refers to the tendency for polymers and molecular materials to from with an ordered, spatial, three-dimensional arrangement of monomer molecules? A. Stereo specificity B. Conductivity C. Retentivity D. Spatial configuration

C. Retentivity

15. Which cast iron is hard and wear resistant? A. Gray iron B. Ductile iron C. White iron D. Malleable iron

C. White iron

11. Galvanized steel are steel products coated with _________. A. Carbon B. Sulfur C. Zinc D. Nickel

C. Zinc

29. The word 'ceramic' meant for ______________. A. soft material B. hard material C. burnt material D. dry material

C. burnt material

18. In saturated Hydrocarbon, Hydrogen atom is bonded to _______ A. another hydrogen atom B. carbon atom and hydrogen atom C. carbon atom only D. neither hydrogen nor carbon atom

C. carbon atom only

1. Polymer comes from Greek words "poly" which means "many" and "meros" which means __________. A. metal B. material C. part D. plastic

C. part

32. The ceramic materials are A. Inorganic substances B. Brittle C. Good thermal insulators D. All of these

D. All of these

7. What term is used to describe a polymer that has rubberlike properties? A. Vulcanizer B. Elasticmer C. Polychloroprene D. Elastomer

D. Elastomer

28. Which material is commonly used in electronic devices? A. Alumina B. Titania C. Silica D. Germanium

D. Germanium

38. Which of the following is false about ceramic structures? A. They are made up of two or more different elements B. More complex than metal structures C. They are electrically neutral D. Less complex than metal structures

D. Less complex than metal structures

34. Which of the following properties ceramics do not possess A. Hardness B. Brittleness C. Elasticity at low temperature D. Malleability

D. Malleability

26. Diamond and corundum are examples of _____ ceramics. A. glass B. stone C. refractories D. abrasives

D. abrasives

30. Most commercial glasses consist of A. lime B. soda C. silica D. all of these

D. all of these

22. The Portland cement is manufacture from the following elements except: A. lime B. silica C. alumina D. asphalt

D. asphalt