Building Materials (Concrete)

Q.1.     Shrinkage in concrete can be reduced by using
(a)        small maximum size of aggregate
(b)        large maximum size of aggregate
(c)        small maximum size of aggregate with high modulus of elasticity
(d)        large maximum size of aggregate with high modulus of elasticity

Q.2.     The rise of temperature in concrete would cause
(a)        contraction
(b)        expansion
(c)        no effect
(d)        contraction followed by expansion

Q.3.     Concrete made of Portland cement disintegrates in the presence of sulphates of
(a)        calcium
(b)        sodium
(c)        magnesium
(d)        all these

Q.4.     The product of disintegration in concrete made of Portland cement is/are
(a)        tri calcium aluminates
(b)        calcium sulpho aluminates
(c)        tri calcium silicates
(d)        all these

Q.5.     In concrete, resistance to chemical attack can be increased using a cement with
(a)        reduced tri calcium aluminate
(b)        increased tri calcium aluminate
(c)        reduced tri calcium silicate
(d)        increased tri calcium silicate

Q.6.     Resistance of concrete to water flow in pores, is called
(a)        honeycombing
(b)        workability
(c)        soundness
(d)        none of these

Q.7.     Impermeability can be increased by adopting
(a)        low water cement ratio
(b)        graded aggregate
(c)        continuous curing
(d)        all these

Q.8.     Increased impermeability in concrete results
(a)        increased resistance to weathering
(b)        reduced resistance to chemical attack and corrosion
(c)        both (a) and (b)
(d)        neither (a) nor (b)

Answer
1. d      2. b      3. d      4. b      5. a      6. d      7. d      8. a

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