निर्माण सामग्री – Construction Materials MCQ

निर्माण सामग्री: प्रश्न र उत्तर

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सही: ० / ०

621. Construction joints in beams and slabs should preferably be located where:

     कThe shear force is maximum खThe bending moment is maximum गThe shear force is minimum घThe beam meets a column
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     छलफल / प्रश्न उत्तरमा गल्ती छ

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622. When concrete is mixed in a batch mixer, the mixing time should generally be not less than about:

     क15 seconds ख2 minutes ग10 minutes घ30 minutes
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623. Weigh batching of concrete materials is preferred over volume batching because it:

     कIs more accurate, as it is not affected by bulking and loose packing of materials खRequires no equipment गUses less cement automatically घEliminates the need for water
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624. In a design mix of concrete, the proportions of ingredients are:

     कSelected only according to the volume of available sand खFixed in advance as 1:2:4 for all works गDecided by the mason on site घDetermined by calculations and trial mixes to achieve the required strength, workability and durability
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

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625. In concrete grade designations such as M20, the letter 'M' refers to:

     कModulus खMortar गMix घMetre
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626. A membrane-forming curing compound is applied to fresh concrete in order to:

     कIncrease the water-cement ratio खSeal the surface and reduce loss of moisture from the concrete गAccelerate the setting by heating घMake the surface rough for plastering
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

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627. Styrene butadiene rubber (SBR) latex is commonly used in repair works as a:

     कBonding agent between old and new concrete or mortar खRetarder for mass concrete गPigment for coloured concrete घRelease agent for formwork
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628. In self-compacting concrete, viscosity modifying agents (VMAs) are added mainly to:

     कIncrease the density of the concrete for shielding खAccelerate setting in cold weather गEntrain air for frost resistance घImprove cohesion and resistance to segregation and bleeding
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629. Calcium chloride should not be used as an accelerator in reinforced and prestressed concrete mainly because it:

     कMakes the concrete very light खPrevents the concrete from setting गPromotes corrosion of the embedded steel घReacts with aggregates to form gypsum
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630. Metakaolin, used as a highly reactive mineral admixture in concrete, is obtained by:

     कGrinding limestone very finely खCalcining kaolin (china clay) at a moderate temperature गBurning rice husk without control घCondensing silicon vapour in a furnace
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