Concrete Technology

• The light weight aggregates may be obtained from

1. Sedimentary rocks
2. Volcanic scoria
3. Metamorphic rocks
4. Igneous rocks

Ans: 2

• To obtain very high strength concrete, use

1. Barite
2. Granite
3. Magnetite
4. Volcanic scoria

Ans:  2

• The aggregates having moistures in pores and having its surface dry are called

1. Moist aggregates
2. Dry aggregates
3. Very dry aggregates
4. Saturated surface dry aggregates

Ans: 4

• The percentage of aggregates of FM 2.6 to be combined with coarse aggregates of FM 6.8 for obtaining the aggregates of  FM 5.4 is

1. 30%
2. 50%
3. 20%
4. 60%

Ans:  2

• For the construction of dams, the maximum permissible size of aggregates is

1. 40mm
2. 20mm
3. 60mm
4. 75mm

Ans: 1

• Primarily concrete consists of

1. Sand
2. Cement
3. Water
4. All

Ans: 4

• The impurity of mixing water which affects the setting time and strength is

1. Sodium sulphates
2. Sodium chlorides
3. Calcium chlorides
4. Sodium carbonates and bicarbonates

Ans: 4

• Water cement ratio is

1. Volume of water to cement
2. Weight of water to cement
3. Volume of cement to water
4. Both 1 and 2

Ans: 4

• After casting , ordinary mix

1. Shrinks when dried
2. Expands when dried
3. Shrinks when wet
4. None

Ans: 1

• The maximum quantity of ingredients present in cement production is

1. Alumina
2. Lime
3. Iron oxide
4. Silica

Ans: 2

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