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Civil Engineering Objective Questions { Concrete Technology }

43.  According to IS : 382-1963, a good aggregate should be
A. chemically inert
B. sufficiently strong
C. hard and durable
D. all the above
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44.  An aggregate is known as cyclopean aggregate if its size is more than
A. 475 mm
B. 30 mm
C. 60 mm
D. 75 mm
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45.  Pick up the correct statement from the following :
A. The maximum size of a coarse aggregate, is 75 mm and minimum 475 mm
B. The maximum size of the fine aggregate, is 475 mm and minimum 0075 mm
C. The material haying particles of size varying from 006 mm to 0002 mm, is known as silt
D. All the above
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46.  If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than
A. 205 mm
B. 305 mm
C. 405 mm
D. 505 mm
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47.  In Q No 1246 the aggregates will be known as elongated aggregate if its length is not less than
A. 815 mm
B. 91 5 mm
C. 1015 mm
D. 1215 mm
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48.  An aggregate is said to be flaky, if its least dimension is less than
A. 2/3 mean dimension
B. 3/4 mean dimension
C. 3/5 mean dimension
D. 5/8 mean dimension
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49. Sand generally contains salt if it is obtained from :
A. nala beds -
B. river beds
C. sea beds
D. all the above
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