2020 Civil Engineering

Consider the following statements for selecting building stones : 1. Seasoning of stones is essential and is done by soaking in water 2. Specific gravity of stone is to be more than 2·7 3. Porosity of stone affects its durability 4. Climatic conditions decide the type of stone to be used in construction Which of the above statements are correct ?

Consider the following statements : 1. Hydrophobic cement grains possesses low wetting ability 2. Rapid-hardening cement is useful in concreting under static, or running water 3. Quick-setting cement helps concrete to attain high strength in the initial period 4. White cement is just a variety of ordinary cement free of colouring oxides Which of the above statements are correct ?

Consider the following statements : 1. Rich mixes are less prone to bleeding than lean ones 2. Bleeding can be reduced by increasing the fineness of cement Which of the above statements is/are correct ?

The yield of concrete per bag of cement for a concrete mix proportion of 1 : 1·5 : 3 (with adopting 2/3 as the coefficient) is

Consider the following statements : 1. Workability of concrete increases with the increase in the proportion of water content 2. Concrete having small-sized aggregates is more workable than that containing large-sized aggregate 3. For the same quantity of water, rounded aggregates produce a more workable concrete mix as compared to angular and flaky aggregates 4. A concrete mix with no slump shown in the slump cone test indicates its very poor workability Which of the above statements are correct ?

A steel wire of 20 mm diameter is bent into a circular shape of 10 m radius. If E, the modulus of elasticity, is 2 × 10⁶ kg/cm², then the maximum tensile stress induced in the wire is, nearly