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WorksheetsCIVIL WAR Day 3(Sep 17)-LSGD
Total questions: 10
Worksheet time: 10mins
Name
Class
Date
1.
Why should slaked lime not be stored in damp environments?
a)
It reacts with CO₂
b)
It gains strength
c)
It forms calcium nitrate
d)
It forms cracks
2.
Which component reacts with lime in autoclaving to form calcium hydrosilicate?
a)
Limestone powder
b)
Quartz sand
c)
Gypsum
d)
Sand
3.
Which IS code relates to laboratory testing methods for lime?
a)
IS 1624
b)
IS 456
c)
IS 6932
d)
IS 712
4.
Which impurity is considered harmful and undesirable for good quality lime?
a)
Pyrites
b)
Iron oxide
c)
Clay
d)
Free form of Silica
5.
Lime putty is a mixture of:
a)
Lime and water
b)
Lime and gypsum
c)
Lime and cement
d)
Lime and sand
6.
Identify the incorrect statement
a)
The initial and final setting time of high alumina cement is 3.5 hr and 5 hr respectively
b)
The amount of water required for the initial setting time cement is 0.75p%
c)
Ratio of percentage of alumina to iron oxide should not be less than 0.66
d)
IS 8112 1989 recommends 43 grade cement for construction of buildings, roads, irrigation etc.
7.
Method of finding fineness of cement is
a)
Sieve test
b)
Air permeability method
c)
Wagner’s turbidimeter method
d)
All of the above
8.
Initial and final setting time of low heat cement respectively
a)
1 hr and 10 hr
b)
5 minute and 30 minute
c)
3.5 hr and 5 hr
d)
30 minute and 10 hr
9.
Heat of hydration is generated by the compounds in order
a)
C4AF > C3A > C3S > C2S
b)
C3A > C2S > C4AF > C3S
c)
C3A > C3S > C2S > C4AF
d)
C3A > C3S > C4AF > C2S
10.
The major reason for the whiteness of white portland cement is
a)
reduction in manganese oxide content
b)
reduction in ferric oxide content
c)
reduction in chromium oxide content
d)
reduction in oxides of nickel
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