Concrete Technology Mid  II, September  2014
1.For complete hydration of cement the w/c ratio needed is

Less than 0.25

more than 0.25 but less than 0.35

more than 0.35 but less than 0.45

more than 0.45 but less than 0.60

Answer: C
2.Before testing setting time one should test for

soundness

strength

fineness

consistency

Answer: D
3.A splitting tensile test is performed on cylinder of diameter D and length L. If the ultimate load is P, then splitting tensile strength of concrete is given by

P/DL

2P/DL

4pL/D3

2pD/L

Answer: B
4.To make one cubic meter of 1:2:4 by volume concrete the volume concrete, the volume of Coarse aggregate required is

0.95m^{3}

0.85m^{3}

0.75m^{3}

0.65m^{3}

Answer: B
5.Durability of concrete is proportional to

sand content

water content

aggregate ratio

cement aggregate ratio

Answer: D
6.Poisson’s ratio for concrete ranges between

0.1

0.15 and 0.25

0.25 and 0.30

0.30 and 0.35

Answer: D
7.Finess modulus of aggregate is between

23.5

3.5 5.0

5  6.0

6  7

Answer: D
8.If slump of concrete mix is 60mm, then its workability is

low

medium

high

very high

Answer: C
9.If compaction factor is 0.95, then workability of concrete is

very low

low

medium

hight

Answer: D
10.Light weight concrete is used in

heat resistance

air conditioning of building

non loading bearing wall

reducing thickness

Answer: B
11.Workability of concrete can be imposed by addition of ……………….
Answer: Zinc
12.Split strength of concrete can be determine by ………………….
Answer: Brazillion test
13.Separation of ingredients from concrete during transportation is called …………………
Answer: Segregation
14.The property of fresh concrete in which the water in the mix trends to rise to the surface while Placing and compaction is called …………………
Answer: Bleeding
15.Stress – strain curve for cement concrete is almost linear up to ……………….
Answer: 0.5 times ultimate stress
16.Young’s modulus of concrete Ec is ……………….
Answer:
17.Poisson’s ration for concrete ranges between ……………….
Answer: 0.30 to 0.35
18.Workability of concrete mix with low water cement ration is determine by ………………
Answer: Tensile strength test
19.For a thick and heavily reinforced structures workability of concrete should be ………………
Answer: Low
20.Water cement ratio is generally expressed in volume of water required per…………… cement bag
Answer: 50kg