Concrete Technology (3150610) MCQs

MCQs of Durability & Permeability of concrete

Showing 1 to 9 out of 9 Questions
1.

efflorescence in cement is caused due to an excess of 

(a)

alkalis
(b)

iron oxide 
(c)

silica
(d)

alumina
Answer:

Option (a)

2.

fly ash can be used as 

(a)

partial replacement of water
(b)

partial replacement of cement 
(c)

partial replacement of fine aggregate
(d)

partial replacement of coarse aggregate 
Answer:

Option (b)

3.

the presence of common salt in sand result in 

(a)

corrosion of reinforcement 
(b)

scaling 
(c)

pitting 
(d)

all of the above 
Answer:

Option (a)

4.

the durability of concrete is due to its resistance to 

(a)

deterioration from environmental conditions
(b)

internal disruptive forces 
(c)

chemical attack 
(d)

all of the above 
Answer:

Option (d)

5.

the thermal conductivity of concrete decreases with the 

(a)

light weight aggregate
(b)

increase in the water/cement ratio 
(c)

decrease in the cement content 
(d)

all of the above 
Answer:

Option (d)

6.

in case of plain concrete exposed to sea waves, the grade of concrete should not be lower than 

(a)

M 15
(b)

M 20 
(c)

M 25
(d)

M 30
Answer:

Option (b)

7.

for high frost resistance, the concrete should be 

(a)

dense
(b)

free from cracks
(c)

air-entrained 
(d)

all of the above 
Answer:

Option (d)

8.

chloride enters the concrete from 

(a)

cement
(b)

mixing water
(c)

admixtures
(d)

all of the above 
Answer:

Option (d)

9.

the permeability of cement paste is mainly due to 

(a)

gel pores 
(b)

capillary pores
(c)

finer cement grains 
(d)

all of the above 
Answer:

Option (c)

Showing 1 to 9 out of 9 Questions