An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than_____.

A)
18.5 mm
B)
16.5 mm
C)
15.5 mm
D)
13.5 mm

Correct Answer :   13.5 mm

Recently Updated in Concrete Technology Questions
Which of the following compound is used for fine polishing?
A)
Nitric oxide
B)
Iron oxide
C)
Silicon carbide
D)
Aluminum oxide

Correct Answer : Option (D) :   Aluminum oxide

Explanation : Powder form of aluminum oxide is used for fine polishing process. It is surface treatment process.

Maximum nominal size of aggregates to be used in concrete may be as large as possible within the limits prescribed by __________
A)
IS 456-2010
B)
IS 456-2000
C)
IS 465-2000
D)
IS 513-1999

Correct Answer : Option (B) :   IS 456-2000

Explanation : Option can be eliminated because there is no such code. Maximum nominal size of aggregates to be used in concrete may be as large as possible within the limits prescribed by IS 456:2000.

Air contents should be _________ % by volume.
A)
1-2
B)
2-3
C)
3-4
D)
4-5

Correct Answer : Option (C) :   3-4

Explanation : This type of cement was first of all developed in U.S.A. It is recommended that air contents should be 03-04 % by volume.

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