Description : While designing an air entrained concrete (A) Water cement ratio is reduced (B) Proportion of aggregates is reduced (C) An allowance for the entrained air is made (D) All the above
Last Answer : (D) All the above
Description : Pick up the correct statement from the following: (A) The weight of ingredients of concrete mix, is taken in kilograms (B) Water and aggregates are measured in litres (C) 20 bags of cement make one tonne (D) All the above
Last Answer : Answer: Option D
Description : For a good concrete (A) Aggregates should be hard and durable (B) Water should be free from organic materials (C) Cement should be sufficient to produce the required strength (D) All the above
Description : According to Water-Cement Ratio Law, the strength of workable plastic concrete (A) Depends upon the amount of water used in the mix (B) Does not depend upon the quality of cement mixed with aggregates (C) Does not depend upon the quantity of cement mixed with aggregates (D) All the above
Description : If 50 kg of fine aggregates and 100 kg of coarse aggregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is (A) 8 kg (B) 10 kg (C) 12 kg (D) 14 kg
Last Answer : Answer: Option C
Description : Pick up the correct statement from the following: (A) An increase in water content must be accompanied by an increase in cement content (B) Angular and rough aggregates reduce the workability of the ... The slump of the concrete mix decreases due to an increase in temperature (D) All the above
Description : For preparing ordinary concrete, the quantity of water used, is (A) 5% by weight of aggregates plus 20% of weight of cement (B) 10% by weight of aggregates plus 10% of weight of cement (C) ... aggregates plus 30% of weight of cement (D) 30% by weight of aggregates plus 10% of weight of cement
Description : Pick up the correct statement from the following: (A) Water cement paste hardens due to hydration (B) During hardening cement binds the aggregates together (C) Cement provides strength, durability and water tightness to the concrete (D) All the above
Description : Concrete gains strength due to (A) Chemical reaction of cement with sand and coarse aggregates (B) Evaporation of water from concrete (C) Hydration of cement (D) All the above
Description : The inert mineral material used for the manufacture of mortars and concrete is (a) Cement (b) Water (c) Aggregates (d) Admixture
Last Answer : (c) Aggregates
Description : Concrete gains strength due to [ A ] Chemical reaction of cement with sand and coarse aggregates [ B ] Evaporation of water from concrete [ C ] Hydration of cement [ D ] All the above
Last Answer : [ C ] Hydration of cement
Description : Shrinkage in concrete can be reduced by using (i) Low water cement ratio (ii) More amount of cement in the concrete (iii) Presaturated aggregates [ A ] i [ B ] i and ii [ C ] i and iii [ D ] i, ii and iii
Last Answer : [ C ] i and iii
Description : When each particle of aggregates is thinly coated with cement paste, a heterogeneous solid is formed, which is known as (A) Hydration (B) Gel (C) Concrete (D) None of these
Description : The ratio of various ingredients (cement, sand, aggregates) in concrete of grade M 200, is (A) 1 : 2 : 4 (B) 1 : 3 : 6 (C) 1 : 1½ : 3 (D) 1 : 1 : 2
Last Answer : (C) 1 : 1½ : 3
Description : For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are: (A) 70 litres of sand and 120 litres of aggregates (B) 70 kg of sand and 140 litres of ... C) 105 litres of sand and 140 litres of aggregates (D) 105 litres of sand and 210 litres of aggregates
Description : For the construction of cement concrete dams, the maximum permissible size of the aggregates, is (A) 40 mm (B) 50 mm (C) 60 mm (D) 70 mm
Last Answer : Answer: Option A
Description : If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is (A) M 100 (B) M 150 (C) M 200 (D) M 250
Description : Pick up the correct statement from the following: (A) Plain cement concrete is equally strong in compression as well as in tension (B) Slump test is performed to check concrete strength (C ... D) Fineness modulus is the index number expressing the relative sizes of both coarse and fine aggregates
Last Answer : Option D
Description : In the reinforced cement concrete structure, the steel reinforcement consists of . (a) Deformed bars (b) Cold twisted bars (c) Mildsteel and medium tensile steel bars (d) All of these
Last Answer : (d) All of these
Description : Pavement is said to be flexible if it contains (A) Water bound macadam surface (B) Stabilised soil base constructed of lime cement or tar (C) Bitumen-bound stone layer of varying aggregates (D) All the above
Description : Batching error means inaccuracy in the quantity of (A) Aggregates (B) Cement (C) Water (D) All the above
Description : For preparing a test-specimen, it is necessary (A) To mix cement and fine aggregate by dry hand (B) To mix coarse aggregates (C) To mix water to the cement, fine aggregates and coarse aggregates (D) All the above
Description : If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respectively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation (A) 0.1P + 0.3Y + 0. ... + 0.2Y + 0.01Z = W/C P (D) 0.5P + 0.3Y + 0.01Z = W/C P
Last Answer : Answer: Option B
Description : For given workability the grading requiring the least amount of water is one that gives (A) Greatest surface area for the given cement and aggregates (B) Least surface area for the given cement ... weight for the given cement and aggregates (D) Greatest weight for the given cement and aggregates
Description : In the method of voids for determination of the quantity of cement paste, it is assumed that (A) Voids in coarse aggregates are filled by fine aggregates (B) Voids in fine aggregates are filled by ... of fine aggregates is equal to total voids in coarse aggregates plus 10% extra (D) All the above
Description : For given water content, workability decreases if the concrete aggregates contain an excess of (A) Thin particles (B) Flat particles (C) Elongated particles (D) All the above
Description : An excess of flaky particles in concrete aggregates (A) Decreases the workability (B) Increases the quantity of water and sand (C) More than 15% are not desirable (D) All the above
Description : Workability of concrete for a given water content is good if the aggregates, are (A) Rounded aggregate (B) Irregular aggregate (C) Angular aggregate (D) Flaky aggregate
Description : Internal friction between the ingredients of concrete, is decreased by using (A) Less water (B) Fine aggregates (C) Rich mix (D) More water and coarse aggregates
Description : Pick up the correct statement from the following: (A) The theory of formation of concrete is based on the phenomena of formation of voids (B) The bulking of sand is taken into account while ... sand and the sand completely flooded with water, have practically the same volume (D) All the above
Description : The internal friction between the ingredients to concrete is minimized by (a) Adopting coarse aggregates (b) Using more water (c) Reducing the surface area (d) All of these
Description : Workability of concrete for a given water content is good, if the aggregates are [ A ] Rounded [ B ] Irregular [ C ] Angular [ D ] Flaky
Last Answer : [ A ] Rounded
Description : Which of the following represents a carpet of sand-bitumen mix without coarse aggregates? (A) Mastic asphalt (B) Sheet asphalt (C) Bituminous carpet (D) Bituminous concrete
Description : For ensuring quality of concrete, use (A) Single sized aggregates (B) Two sized aggregate (C) Graded aggregates (D) Coarse aggregates
Last Answer : (C) Graded aggregates
Description : Pick up the correct statement from the following: (A) According to the petrological characteristics, concrete aggregates are classified as heavy weight, normal weight and light weight (B) According to ... glassy, smooth, granular, rough, crystalline, honey combed and porous (D) All the above
Description : The strength and quality of concrete, depend upon: (A) Grading of aggregates (B) Surface area of aggregates (C) Shape of aggregates (D) All the above
Description : The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be (A) Between 150 to 300 kg/cm2 (B) Between 350 to 600 kg/cm2 (C) Between 150 to 500 kg/cm2 (D) Below 200 kg/cm2
Description : The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is (A) Rounded aggregate (B) Irregular aggregate (C) Angular aggregate (D) Flaky aggregat
Description : Concrete containing (A) Siliceous aggregates, has higher co-efficient of expansion (B) Igneous aggregates, has intermediate coefficient of expansion (C) Lime stones, has lowest co-efficient of expansion (D) All the above
Description : The stones obtained by blasting are used as (A) Ballast in railways (B) Aggregates for concrete (C) Road metal (D) All the above
Description : Which of the following statement is correct (a) The maximum size of coarse aggregate should not exceed one fourth of the minimum dimension of the plain concrete member. (b) The maximum size of coarse ... aggregates of 40mm, 20mm and 10mm sizes are commonly used for concrete works (d) All the above
Last Answer : (d) All the above
Description : The function of aggregates in concrete is to serve as (a) Binding material (b) Filler (c) Catalyst (d) All the above
Last Answer : (b) Filler
Description : The strength of durability of concrete depends upon. (a) Size of aggregates (b) Grading of aggregates (c) Moisture contents of aggregates (d) All of these.
Last Answer : (d) All of these.
Description : Fly ash when added to concrete [ A ] Acts as aggregates [ B ] Acts as pozzolona [ C ] Improves appearance [ D ] Reduces setting time
Last Answer : [ B ] Acts as pozzolona
Description : The proportion of coarse aggregates to fire aggregates in structural concrete is usually [ A ] 0.50 - 1.25 [ B ] 1.25 - 4.50 [ C ] 1.50 - 2.50 [ D ] 0.25 - 0.75
Last Answer : [ C ] 1.50 - 2.50
Description : For reinforced concrete work, aggregates having a nominal size of -------- are generally used [ A ] 20 mm [ B ] 40 mm [ C ] 50 mm [ D ] 60 mm
Last Answer : [ A ] 20 mm
Description : In a mass concrete, the aggregates occupy a space of [ A ] 25% [ B ] 75% [ C ] 40% [ D ] 60%
Last Answer : [ B ] 75%
Description : The strength and quality of concrete depends upon (i)Grading of aggregates (ii)Shape of aggregates (iii)Surface area of aggregates (iv)Surface texture of aggregates [ A ] i, ii and iv [ B ] ii, iii and iv [ C ] i, iii and iv [ D ] i, ii, iii and iv
Last Answer : [ D ] i, ii, iii and iv
Description : Concrete contains (i)Siliceous aggregates, having higher coefficient of expansion (ii)Igneous aggregates, having intermediate coefficient of expansion (iii)Lime stones, having lowest coefficient of expansion [ A ] i and iii [ B ] ii and iii [ C ] i and ii [ D ] i, ii and iii
Last Answer : [ D ] i, ii and iii
Description : Portland cement consists mainly of (A) CaO & SiO2 (B) SiO2 & Al2O3 (C) CaO & Al2O3 (D) CaO & Fe2O3
Last Answer : (A) CaO & SiO2