Pick up the incorrect statement from the following. For performing compressive strength test of cement (A) Cement and standard sand mortar are used in the ratio of 1 : 3 (B) Water is added at the rate of (P/4) + 3.0 percentage of water where P is the percentage of water for standard consistency (C) A cube mould of 10 cm × 10 cm × 10 cm is used (D) The prepared moulds are kept in a atmosphere of 50% relative humidity

Pick up the incorrect statement from the following. For performing compressive strength test of
cement
(A) Cement and standard sand mortar are used in the ratio of 1 : 3
(B) Water is added at the rate of (P/4) + 3.0 percentage of water where P is the percentage of
water for standard consistency
(C) A cube mould of 10 cm × 10 cm × 10 cm is used
(D) The prepared moulds are kept in a atmosphere of 50% relative humidity
by

1 Answer

Answer :

Answer: Option A
by

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For determining the compressive strength test on cement is, the percentage amount of water to be added as (Pa = Percentage of water for required consistency) [ A ] 0.25 Pa + 2.5 [ B ] 0.25 Pa + 3.5 [ C ] 0.35 Pa + 2.5 [ D ] 0.35 Pa + 3.5

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Last Answer : [ B ] 0.25 Pa + 3.5

For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of (A) 1 : 2 (B) 1 : 3 (C) 1 : 4 (D) 1 : 6

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Pick up the incorrect statement from the following: (A) With passage of time, the strength of cement increases (B) With passage of time, the strength of cement decreases (C) After a period of 24 months, the strength of cement reduces to 50% (D) The concrete made with storage deteriorated cement, gains strength with time

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The percentage of water for making a cement paste of normal consistency varies from (a) 15 to 25% (b) 25 to 35% (c) 35 to 50% (d) 50 to 60%

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For different layers of cement concrete floor. Pick up the incorrect statement from the following: (A) The lowest layer consists of consolidated ground (B) A 10 cm thick clean sand is laid on consolidated ground (C) A 10 cm lime concrete (1 : 4 : 8) is laid on clean sand (D) A 10 cm thick cement concrete (1 : 2 : 4) is laid on top layer

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When percentage of mica present in sand is large, it (a) Reduces the strength of mortar, or concrete (b) Increases the strength of mortar or concrete (c) Has no effect on mortar, or concrete strength (d) Enhances the strength of mortar, or concrete, but only marginally

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The curing method is said to be good, when the relative humidity is kept [ A ] Greater than 80% [ B ] Less than 50% [ C ] 50% - 80% [ D ] None of the above

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Pick up the correct statement from the following: (A) Acid test is done to find out the weathering quality of stones (B) Attrition test is done to find out the rate of wear of stones which are used in road construction (C) Crushing test is done to find out the compressive strength of the stone (D) All the above

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For plastering the exposed brick walls, the cement sand mortar should be (A) 1 : 2 (B) 1 : 3 (C) 1 : 4 (D) 1 : 6

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Pick up the incorrect statement from the following: (A) Space between the exterior walls of a warehouse and bag piles should be 30 cm (B) Cement bags should preferably be piled on wooden planks (C) Width and height of the pile should not exceed 3 m and 2.70 m respectively (D) None of these

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Pick up the correct statement from the following: (A) Absolute humidity at a given temperature is equal to weight of moisture present in a unit volume (B) Relative humidity is the ratio of actual vapour pressure and saturation vapour pressure at the same temperature (C) Relative humidity is the ratio of the weight of the vapours present per unit volume to the weight of vapours which could be contained at the same temperature when fully saturated (D) All the above

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Pick up the incorrect statement from the following: (A) Horizontal D.P.C. is provided at plinth level in internal walls (B) D.P.C. is provided under door and verandah openings (C) Vertical D.P.C. is not provided in internal walls (D) Cement concrete is a rigid damp-proofing material

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A thick paste of cement, sand and water is called – (1) Concrete (2) R.C.C. (3) Mortar (4) Kiln

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If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is, (A) 20 % (B) 25 % (C) 30 % (D) 35 %

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