Building Materials, Third Edition

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4. The commercially successful fibres in fibre reinforced concrete are of
   (a) asbestos (b) glass
   (c) steel (d) carbon


5. The pull out resistance of fibres in fibre reinforced concrete does not depend upon
   (a) number of fibres crossing the crack
   (b) length of fibres
   (c) diameter of fibres
   (d) tensile strength of fibres


6. The thickness of ferrocement may be
   (a) 20 mm (b) 50 mm
   (c) 75 mm (d) 100 mm


7. No fines concrete is
   (a) light weight concrete (b) heavy weight concrete
   (c) fibre reinforced concrete (d) ferrocement


8. Which of the following is not a light weight concrete
   (a) No fines concrete (b) Cellular concrete
   (c) Foam concrete (d) Prestressed concrete


9. Concrete recommended for radiation shielding is
   (a) light weight concrete (b) heavy weight concrete
   (c) fibre reinforced concrete (d) ready mixed concrete


10. Which one of the following types of concrete is most suitable in extreme cold climates?
    (a) Air-entrained (b) Ready mix concrete
    (c) Vacuum concrete (d) Heavy weight concrete


11. Bacterial concrete is one that
    (a) is affected by bacteria
    (b) is placed in marine conditions
    (c) is used in polluted environment
    (d) has auto crack healing capacity


12. Self-compacting concrete is characterized by
    (a) high powder component
    (b) high water-powder ratio
    (c) cementitious materials up to 30%.
    (d) rough surface finish.

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1. (d) 2. (d) 3. (d) 4. (a) 5. (d) 6. (a) 7. (c) 8. (d) 9. (b) 10. (a)


2. (d) 12. (a)