Nala beds
River beds
Sea beds
None of these
C. Sea beds
10 %
12 %
15 %
25 %
1 : 3 : 6 mix
1 : 1 :2 mix
1 : 2 : 4 mix
1 : 1.5 : 3 mix
Water content and its temperature
Shape and size of the aggregates
Air entraining agents
All the above
Length 30 cm, breadth 25 cm, height 30 cm
Length 39 cm, breadth 25 cm, height 32 cm
Length 27 cm, breadth 27 cm, height 48 cm
Length 220 cm, breadth 25 cm, height 40 cm
Extremely low
Very low
Low
High
10 cm
15 cm
20 cm
25 cm
0.003
0.0003
0.00003
0.03
0.207 l
0.25 l
0.293 l
0.333 l
8 kg
10 kg
12 kg
14 kg
7.30
7.35
7.40
7.45
2000 bags
2200 bags
2400 bags
2700 bags
Shear strength
Tensile strength
Compressive strength
None of these
Internal vibrator
Screed vibrator
Form vibrator
None of these
Cement should be mixed for at least one minute
10% of water is placed in the rotating drum before adding dry material
10% of water is added after placing the other ingredients in the drum
All the above
Lime stone and clay
Gypsum and lime
Pozzolana
Lime, pozzolana and clay
According to the petrological characteristics, concrete aggregates are classified as heavy weight, normal weight and light weight
According to the shape of the particles, concrete aggregates are classified as rounded irregular, angular and flaky
According to the surface texture of the particles, the concrete aggregates are classified as glassy, smooth, granular, rough, crystalline, honey combed and porous
All the above
Admixtures accelerate hydration
Admixtures make concrete water proof
Admixtures make concrete acid proof
Admixtures give high strength
Single size coarse aggregate is roughly 0.45
Graded coarse aggregate is roughly 0.040
Fine aggregate is roughly 0.45
All the above
Only (i)
(i) and (ii)
(i) and (iii)
All (i), (ii) and (iii)
100 kg/cm2
150 kg/cm2
200 kg/cm2
250 kg/cm2
10 kg
12 kg
14 kg
16 kg
When one thrusts one's hand into a bag of cement, one should feel warm
The colour of the cement is bluish
By rubbing cement in between fingers, one should feed rough
All the above
2 %
4 %
6 %
8 %
Smooth
Granular
Glassy
Honey combed and porous
To eliminate air holes
To achieve maximum density
To provide intimate contact between the concrete and embedded materials
All the above
Economy
Durability
Workability
All the above
Weight 50 kg
Height 18 cm
Plan area 3000 sq. cm
All the above
An increase in water content must be accompanied by an increase in cement content
Angular and rough aggregates reduce the workability of the concrete
The slump of the concrete mix decreases due to an increase in temperature
All the above
Rapid rate during the first few days and afterwards it continues to increase at a decreased rate
Slow rate during the first few days and afterwards it continues to increase at a rapid rate
Uniform rate throughout its age
None of these
Colour
Strength
Controlling setting time
None of these