REVIEWER

Please answer the following questions and use this as your reviewer for the exam. Thanks.

I. Multiple Choice. Choose the letter that corresponds to the best answer and write the letter on the space provided before each number.

____ 1. Plastics are the materials obtained by mixing the __________ with the other ingredients which impart special engineering properties. A. Resin B. Monomer C. Catalyst D. Any polymer

____ 2. Which of the following polymers is not a thermoplastic?

A. Nylon B. PVC C. Polythene D. Bakelite

____ 3. Which of the following is a thermosetting polymer?

A. polystyrene B. polyolefins C. phenolic resins D. nylons

____ 4. Which of the following polymer exhibit a lower value of molar cohesion?

A. wool B. silk C. Vulcanized rubber D. polystyrene

____ 5. Which one of the following is used for making disposable cups?

A. LDPE B. PS C. PP D. PVC

____ 6. Which of these is not natural fiber?

A. cotton B. jute C. rayon D. silk ____ 7. Aluminum is used for making cooking utensils. Which of the following properties of aluminum are responsible for the same?

(i) Good thermal conductivity

(ii) Good electrical conductivity

(iii) Ductility

(iv) High melting point

A. (i) and (ii) B. (i) and (iii) C. (ii) and (iii) D. (i) and (iv)

____ 8. An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open. It reacts vigorously with water. Identify the element from the following:

A. Na B. Mg C. P D. Ca

____ 9. The most malleable metal is ____

A. aluminum B. gold C. iron D. silver ____ 10. The most abundant metal in the earth’s crust is____ A. Aluminum B. Iron C. Calcium D. Sodium ____ 11. Why are metals good conductors of electricity? A. They contain free electrons. C. They have high melting point. B. The atoms are lightly packed. D. All of these ____ 12. Which one of the following pairs of metals are most unlikely to corrode? A. Iron and lithium C. magnesium & potassium B. Copper and sodium D. silver & gold ____ 13. Which of the following statements is incorrect? A. Metals have high melting points. C. Metals are good conductors of heat. B. Lead and mercury are best conductors of heat. D. Pure metals have a shining surface. ____ 14. When ______ is mixed with nickel and chromium, we get stainless steel. A. Copper B. Zinc C. Iron D. Tin ____ 15. Which of the following mixture of metals is used in preparing brass? A. Zinc and copper C. Nickel and zinc B. Copper and iron D. Iron and nickel ____ 16. Which of the following is a property of ceramics? A. low strength C. low melting point B. resistant to corrosion D. bad insulation ____ 17. Porcelain is a type of ____________ ceramic. A. Whiteware B. stone C. abrasive D. cement ____ 18. Diamond and corundum are examples of ______________ ceramics. A. glass B. stone C. refractories D. abrasives ____ 19. Which class of engineering ceramics generally includes lubricant materials? A. sulphides B. carbides C. metalloids D. nitrites ____ 20. Which of the following characteristics does not belong to the ceramics? A. low density compared to metals C. high thermal conductivity B. high hardness & very brittle D. high corrosion resistance

II. Cite at least two key points to describe each of the following:

  1. a. abrasives b. refractories c. cements    d. rubbers
  2. a. acid rain    b. Eutrophication    c. Photochemical smog d. Temperature inversion