midterm retest

Which of the following does NOT belong to the ceramic industry?

• Glass

• Cement

• Foams

• Sanitary ware

Which of the following monomers is the composition of natural rubber?

• isoprene

• propane

• propene

• isopropyl

Which of the following substances make up a glaze?

• silicon

• silicate

• sulfur

• manganese

Which of the following materials is a thermoset plastic?

• polyvinyl chloride

• polypropylene

• polyethylene tetrahalides

• Melamine formaldehyde

Which of the following polymers do(es) NOT melt and change its/their shape when heated?

• branched polymer

• linear polymer

• cross-linked polymer

• branched and linear polymers

Can thermoset plastics be reshaped into a new product after they set? Why?

• No, because molecules of thermoset plastics are bounded in cross-linked chains.

• No, because molecules of thermoset plastics are bounded in branched and linear chains.

• Yes, because molecules of thermoset plastics are bounded in branched chains.

• Yes, because molecules of thermoset plastics are bounded in linear chains.

Which of the following is CORRECT about ceramics?

• They are glazed stones          

• They are fired clay    

• They are ruined clay

• They are washed clay

Which of the following fibers is tolerant to mildew and microorganisms, resistant to chemicals and dries quickly after washed?

• Cotton

• silk     

• linen

• nylon

Which of the following is CORRECT about cellulose acetate?

• It is a semi-synthetic fiber

• It is a natural fiber

• It is an optical fiber   

• It is a synthetic fiber

Which of the following is a NOT a composite?

• wood

• bone

• cement

• concrete