Concrete Technology MCQs

Question 1

Pick up the correct statement from the following :

Accepted Answer

All the above

Answer

There should not be any loss of cement from the charged drum of the mixer

Answer

Cement should be mixed for at least one minute

Answer

10% of water is placed in the rotating drum before adding dry material

Question 2

If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is

Accepted Answer

18,900 litres

Answer

15,900 litres

Answer

16,900 litres

Answer

17,900 litres

Question 3

Joints in concrete structures, are provided

Accepted Answer

all the above

Answer

to reduce the tensile stresses likely to be developed due to evaporation of water

Answer

to minimise the change in the dimensions of the slab

Answer

to minimise the necessary cracking

Question 4

The main object of compaction of concrete, is :

Accepted Answer

all the above

Answer

to eliminate air holes

Answer

to achieve maximum density

Answer

to provide initimate contact between the concrete and embedded materials

Question 5

Too wet concrete may cause

Accepted Answer

all the above

Answer

weakness of concrete

Answer

excessive laitance

Answer

segregation

Question 6

Non-uniform compaction may cause the concrete

Accepted Answer

all the above

Answer

porous

Answer

non-homogeneous

Answer

reduced strength

Question 7

The compaction of concrete, improves

Accepted Answer

all the above

Answer

density

Answer

strength

Answer

durability

Question 8

For compacting plain concrete road surface of thickness less than 20 cm, we use

Accepted Answer

screed vibrator

Answer

internal vibrator

Answer

form vibrator

Answer

none of these

Question 9

The final operation of finishing floors, is known as

Accepted Answer

trowelling

Answer

screeding

Answer

floating

Answer

finishing