691. Plastic bitumen is generally used for
A. road pavements
B. expansion joints
C. crack fillings
D. none to these.

692. Bitumen emulsion is
A. a liquid containing bitumen in suspension
B. a paint
C. used as anti-corrosive paint
D. all the above.

693. Bitumen felt
A. is used as water proofing material
B. is used as damp proofing material
C. is made from bitumen and hessian fibres
D. all the above.

694. Mastic asphalt is normally used for
A. sound insulation
B. water proofing
C. fire proofing
D. none to these.

695. The filler used in plastic bitumen, is
A. shale powder
B. talc powder
C. asbestos powder
D. plastic powder

696. Bitumen felt is used for
A. water proofing
B. damp proofing
C. both (a) and (b)
D. neither (a) nor (b).

697. A ferrous metal is
A. cast iron
B. wrought iron
C. steel
D. all the above.

698. Depending on the chemical composition and mechanical properties, iron may be classified as
A. cast iron
B. wrought iron
C. steel
D. all the above.

699. Iron ore may contain
A. carbon
B. silicon
C. sulphur
D. all the above.

700. Pig iron is manufactured from the ores by
A. dressing
B. calcination and roasting
C. smelting
D. all the above.

NOTE
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