162.  Expansion joints are provided if the length of concrete structures exceeds
A. 10 m
B. 15 in
C. 15 in
D. 45 m

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163.  According to the recommendations of IS : 456-1978, the expansion joints
A. are provided where plane changes abruptly
B. are provided to ensure minimum resistance
C. are supported on separate columns
D. all the above

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164.  Construction joints are generally provided in concrete
A. roads
B. retaining walls
C. lining of canals
D. all the above

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165.  Pick up the correct statement from the following :
A. Construction joints are necessarily planned for their locations
B. Expansion joints are provided to accommodate thermal expansion
C. Construction joints are provided to control shrinkage cracks
D. All the above

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166.  An aggregate which passes through 25 mm IS sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than
A. 225 mm
B. 185 mm
C. 165 mm
D. 135 mm

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167. The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is
A. rounded aggregate
B. irregular aggregate
C. angular aggregate
D. flaky aggregate

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168.  Workability of concrete for a given watercentent is good if the aggregates, are
A. rounded aggregate
B. irregular aggregate
C. angular aggregate
D. flaky aggregates

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