Concrete Technology - Section 1 (4)

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Concrete Technology - Section 1

This section is full with the important questions related to this field
and you can give test if you want to enhance the aptitude ability.

25.

The increased cohesiveness of concrete, makes it

A.	less liable to segregation
B.	more liable to segregation
C.	more liable to bleeding
D.	more liable for surface scaling in frosty weather
E.	none of these.

Answer: Option A

Explanation:

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26.

The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary method of proportioning

A.	1 : 1 : 2
B.	1 : 2 : 4
C.	1 : 3 : 6
D.	1 : 2 : 8
E.	1 : 4 : 10

Answer: Option E

Explanation:

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27.

An aggregate is said to be flaky if its least dimension is less than

A.	1/5th of mean dimension
B.	2/5th of mean dimension
C.	3/5th of mean dimension
D.	4/5th of mean dimension
E.	none of these.

Answer: Option C

Explanation:

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28.

Construction joints are provided

A.	where B.M. and S.F. are small
B.	where the member is supported by other member
C.	at 18 m apart in huge structures
D.	in concrete wall at sill level of windows
E.	all the above.

Answer: Option E

Explanation:

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29.

While compacting the concrete by a mechanical vibrator, the slump should not exceed

A.	2.5 cm
B.	5.0 cm
C.	7.5 cm
D.	10 cm
E.	15 cm

Answer: Option B

Explanation:

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30.

Curing

A.	reduces the shrinkage of concrete
B.	preserves the properties of concrete
C.	prevents the loss of water by evaporation
D.	all of the above.

Answer: Option D

Explanation:

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31.

The bulk density of aggregates does not depend upon :

A.	size and shape of aggregates
B.	specific gravity of aggregates
C.	grading of aggregates
D.	size and shape of the container
E.	none of these.

Answer: Option D

Explanation:

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32.

Proper proportioning of concrete, ensures

A.	desired strength and workability
B.	desired durability
C.	water tightness of the structure
D.	resistance to water
E.	all the above.

Answer: Option E

Explanation:

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