Question Gypsum is added in manufacturing of cement to Type Multiple_choice Option Increase strength inCorrect Option Decrease setting time Incorrect Option Decrease plasticity InCorrect Option Increase setting time correct Solution Gypsum prevents Flash Setting of cement during manufacturing. · It retards the setting time of cement (so increase the setting time) Marks 2 Question The compound causes the setting of cement is Type Multiple_choice Option 𝐶3 S Incorrect Option 𝐶2 S Incorrect Option 𝐶3 A Correct Option C4AF Incorrect 0 Solution Marks 2 0 Question Grade of the cement represents Type Multiple_choice Option Compressive strength of cement for 28 days Option Minimum compressive strength of Correct cement for 28 days Option Tensile strength of cement for 28 days Option Maximum compressive strength of Incorrect cement for 28 days Solution Grade of the cement represents 28 days minimum compressive strength in N/mm2. incorrect InCorrect Grade of the cement depends on two factors 1) Fineness of cement 2) Quality of raw materials With increase in both fineness and quality of raw materials grade of the cement increases. Cement with higher grades like 63, 73, 83…. are not manufactured as they require higher fineness. But cement with higher fineness is subjected to air setting. Marks 2 0 Question Quick setting cement is manufactured Type Multiple_choice Option by increasing gypsum inCorrect Option by increasing 𝐶3 A Incorrect Option by adding calcium chloride InCorrect Option by reducing gypsum correct Marks 2 0 Question Le-chatlier expansion for OPC should not be more than Type Multiple_choice Solution Option 20mm incorrect Option 8mm Incorrect Option 5mm InCorrect Option 10mm Correct Marks 2 0 Question For perfectly rounded aggregate angularity number is Type Multiple_choice Option 0 Correct Option 11 Incorrect Option 33 InCorrect Option 67 Incorrect Solution Solution Marks 2 0 Question What does the fineness modulus of aggregate indicates Type Multiple_choice Option Percentage passing incorrect Option Percentage retained Incorrect Option Mean size of the particle in a sample Correct Option Higher size of the particles in a sample Incorrect Solution Marks 2 0 Question Fineness modulus of sand used in construction ranges from Type Multiple_choice Option 2.2-2.6 incorrect Option 2.2-3.2 Correct Option 2.2-2.9 InCorrect Option 2.2-3.5 Incorrect 2 0 Solution Marks Question Bulking of sand is due to the Type Multiple_choice Option Water absorption incorrect Option Formation of films on particle Incorrect Option Hydration InCorrect Option Bulking Correct Solution Bulking is increase in volume because of the adsorption of moisture. When water is added to the dry sand, water forms a thin film around each particle because of the surface tension Marks 2 Question Soundness test of aggregate refers to Type Multiple_choice Option Resistance to expansion inCorrect Option Resistance to weathering correct Option Resistance to abrasion InCorrect Option Resistance to crushing InCorrect 0 Solution Soundness test: In case of aggregate, soundness is the resistance to weathering In this test aggregate is subjected to alternate immersion and drying Marks 2 0 Question Aggregate abrasion value test is conducted using i) Dorry testing machine ii) Devil testing machine iii) compaction factor apparatus iv) Hindell apparatus Type Multiple_choice Option Both i and iv inCorrect Option i, ii, iv Incorrect Option All the above InCorrect Option Both i, ii correct Solution There are three apparatus to determine the aggregate abrasion value. i. Los angels testing machine ii. iii. Dorry‟s testing machine Deval testing machine Marks 2 0 Question To determine the specific gravity of aggregate greater than 10mm size, instrument used is Type Multiple_choice Option Wire basket Correct Option Pycnomter Incorrect Option Density bottle InCorrect Option Lechatlier flask Incorrect Solution There are two apparatus to determine specific gravity of aggregate i) Pycnometer- used when size of aggregate is less than 10mm. ii) Wire basket - used when size is greater than or equal to 10mm. Marks 2 0 Question What is the minimum mixing time for concrete suggested by IS456:2000 Type Multiple_choice Option 20mins inCorrect Option 5mins Incorrect Option 2mins InCorrect Option 2hrs correct Solution Mixing time should be 2-3minutes Mixing less than 2 minutes leads to honey combing Mixing time greater than 3 minutes leads to segregation Marks 2 0 Question with increase in size of aggregate in concrete Type Multiple_choice Option Strength decrease and workability Correct increase Option Strength increase and workability Incorrect decrease Option Strength increase and workability InCorrect increase Option Strength decrease and workability Incorrect decrease Solution For big size aggregate the total surface area to be wetted is less, also less paste is required for lubricating the surface to reduce internal friction. For a given water content big size aggregate give high workability and less strength Marks 2 Question Which of the following is the standard size of modular brick? Type Multiple_choice Option 19×9×9mm inCorrect Option 20x10x10mm Incorrect Option 20x10x10cm InCorrect Option 19x9x9cm correct Solution Standard or modular side of brick is 19x9x9 cm Nominal size of brick is- 20x10x10 cm 0 Marks 2 0 Question Which of the following increase shrinkage of bricks? Type Multiple_choice Option Alumina Correct Option Lime Incorrect Option Silica InCorrect Option Iron oxide Incorrect 2 0 Solution Marks Question Which is the dominant compound in brick earth? Type Multiple_choice Option Lime incorrect Option Silica Incorrect Option Alumina Correct Option Magnesia InCorrect Marks 2 0 Question Which of the following is the minimum compressive strength of first class brick? Type Multiple_choice Option 10.5Pa inCorrect Option 10.5MPa correct Option 10.5 kg/cm2 InCorrect Option 105Pa Incorrect Solution Solution For first class brick minimum compressive strength required is 10.5N/mm2 or 10.5MPa or 105kg/cm2 Marks 2 Question As per IS1077:1992, Water absorption of a brick used in construction shouldn't not be more than Type Multiple_choice Option 5 inCorrect Option 10 Incorrect Option 20 Correct Option 25 Incorrect Solution As per is 1077:1992, water absorption should not be more Than 20% for a brick used in construction, 15% for higher class bricks and 10% heavy duty bricks. Marks 2 Question Which of lime can be used in the moist conditions? Type Multiple_choice 0 0 Option Slaked lime Incorrect Option Quick lime Incorrect Option Pure lime InCorrect Option Hydraulic lime Correct Marks 2 0 Question Which of the following is the advantage of using lime in mortar? Type Multiple_choice Option Lime gives high strength incorrect Option Lime gives less shrinkage Incorrect Option Lime causes setting early InCorrect Option Lime causes high plasticity Correct 2 0 Solution Solution Marks Question Hydraulicity of hydraulic lime is because of presence of Type Multiple_choice Option Clay Correct Option Gypsum Incorrect Option Alkalis InCorrect Option Impurities Incorrect Marks 2 0 Question Which of the chemical causes strength to brick earth? Type Multiple_choice Option Silica inCorrect Option Iron oxide correct Option Alumina InCorrect Option Lime Incorrect 2 0 Solution Solution Marks Question Which of the moulding doesn't require tempering process? Type Multiple_choice Option Hand moulding inCorrect Option Table moulding Incorrect Option Plastic clay machine moulding InCorrect Option Dry clay machine moulding correct Solution Dry clay machine moulding does not require tempering and drying as no water is added for moulding. Marks 2 Question Which of the following has higher capacity of burning? Type Multiple_choice Option Clamp Incorrect Option Intermittent kiln Incorrect 0 Option Bull trench kiln InCorrect Option Hoffman's kiln Correct Solution Hoffman’s kiln has higher capacity of producing the bricks Marks 2 Question Which of the following is acidic igneous rock? Type Multiple_choice Option Basalt inCorrect Option Andesite Incorrect Option Gabbro InCorrect Option Granite correct Solution 0 Marks 2 0 Question Metamorphism of basalt lead to formation of Type Multiple_choice Option Gneiss inCorrect Option Schist correct Option Slate InCorrect Option Rhyolite Incorrect 2 0 Solution Marks Question Which of the following is a foliated rock? Type Multiple_choice Option Granite inCorrect Option Marble Incorrect Option Slate Correct Option Shale Incorrect Solution • These rocks have tendency to be split into thin sheets in a definite direction. • Foliated structure is very common in metamorphic rocks except marble Marks 2 0 Question For a good building stone compressive strength must be more than Type Multiple_choice Option 10MPa inCorrect Option 100MPa correct Option 40MPa InCorrect Option 3.5MPa Incorrect Solution Compressive strength of building stone should not be less than 3.5 N/mm2 Compressive strength of good building stone should not be less than 100N/mm2 Marks 2 Question The rock generally used for roofing, is Type Multiple_choice Option Granite Incorrect Option Pumice Incorrect Option Slate Correct Option Basalt Incorrect Marks 2 0 Question Smith test is conducted to determine Type Multiple_choice Option Durability of stone incorrect Option Hardness Incorrect Option Toughness InCorrect 0 Solution Option Presence of soluble matter correct Marks 2 0 Question Which of the following is a good fire-resistant stone? Type Multiple_choice Option Sandstone Correct Option Granite Incorrect Option Quartzite InCorrect Option Marble Incorrect Marks 2 0 Question Coefficient of hardness of stone varies from Type Multiple_choice Option 0-8 Solution Solution inCorrect Option 0-11 Incorrect Option 0-15 InCorrect Option 0-20 correct Marks 2 0 Question Which of the following component of paint absorbs oxygen from atmosphere? Type Multiple_choice Option Base inCorrect Option Vehicle Incorrect Option Drier InCorrect Option solvent correct 2 0 Solution Solution Marks Question Which of the following must be used in preparation of varnish? Type Multiple_choice Option resins inCorrect Option alcohol Incorrect Option water InCorrect Option turpentine correct Marks 2 0 Question What is the life time of a highly durable timber? Type Multiple_choice Option 5-10 years inCorrect Option Less than 5 years Incorrect Option Greater than 10 years InCorrect Option Greater than 30 years correct Solution Solution Marks 2 0 Question Heartwood is ___________. Type Multiple_choice Option Hard in nature and light in colour inCorrect Option Hard in nature and dark in colour Incorrect Option soft in nature and light in colour InCorrect Option soft in nature and dark in colour correct Marks 2 0 Question The metal which do not contain iron ores as main constituent are called as __________. Type Multiple_choice Option Ferrous metals inCorrect Option Non ferrous metals Incorrect Solution Option Pig iron metals InCorrect Option Cast iron metals correct Marks 2 0 Question What is the name of the part labelled as X? Type Multiple_choice Option Pith Correct Option Bast Incorrect Option Sap wood InCorrect Option Heart wood incorrect Solution Solution Marks 2 0 Question What is the name of the defect in timber? Type Multiple_choice Option Knot Correct Option Cup shakes Incorrect Option Star shakes InCorrect Option Radial shakes incorrect 2 0 Solution Marks Question Type Multiple_choice Option inCorrect Option Incorrect Option InCorrect Option correct Solution Marks 2 0 Question Type Multiple_choice Option inCorrect Option Incorrect Option InCorrect Option correct Solution Marks 2 0 Question Type Multiple_choice Option inCorrect Option Incorrect Option InCorrect Option correct Solution Marks 2 0 Question Type Multiple_choice Option inCorrect Option Incorrect Option InCorrect Option correct Solution Marks 2 0 Question Type Multiple_choice Option inCorrect Option Incorrect Option InCorrect Option correct Solution Marks 2 0 Question Type Option Multiple_choice inCorrect Option Incorrect Option InCorrect Option correct Solution Marks 2 0 Question Type Multiple_choice Option inCorrect Option Incorrect Option InCorrect Option correct Solution Marks 2 0
