www.byjusexamprep.com Mock Test Solutions in English Questions 1. 2. 3. 4. The approximate ratio between the strength of cement concrete at 7 days and at 28 days is A. B. C. D. Which of the following materials offer great resistance to cracking or disintegration when subjected to fire? A. Glass B. Asbestos cement C. Aluminium D. Steel In an auditorium if the reverberation time works out to a value greater that 15 seconds is considered as A. very good B. good C. Very bad D. bad Consider the following statements. Which of these are correct? High water to cement ratio in concrete result in 1) Stronger mix 2) Better workable mix 3) Weak mix 4) Less bleeding 5. A. 1 and 2 B. 2 and 3 C. 3 and 4 D. 1 and 4 The role of super Plasticizer in a cement paste is to A. disperse the particles B. disperse the particles and to remove air bubbles C. disperse the particles, remove air bubbles and to D. retard setting retard setting 6. Consider the following stages in the manufacturing of bricks www.byjusexamprep.com 1) Weathering 2) Moulding 3) Tempering The correct sequence of these stages in the manufacturing of bricks 7. 8. 9. A. 1, 3, 2 B. 1, 2, 3 C. 2, 3, 1 D. 3, 2, 1 What is the percentage of fine aggregate of fineness modulus 2.6 to be combined with coarse aggregate of fineness modulus 6.8 for obtaining combined aggregate of fineness modulus 5.4? A. 33% B. 40% C. 50% D. 60% Thumb-nail and knife scratching test is to determine A. Hardness of stone B. Toughness of stone C. Strength of stone D. Durability of concrete During cement manufacturing, when clinkers are formed, kiln temperature approximately is A. 1200oC B. 1800oC C. 1500oC D. 1300oC 10. Corrosion resistance of stainless steel is due to A. Chromium B. Vanadium C. Carbon D. Sulphur 11. Drag lines are used to excavate A. Hard earth below ground level B. Soft earth below ground level C. Hard earth above ground level D. Soft earth above ground level 12. The test conducted for the calculation of basic compressive stress of masonry is: A. Vibration test B. Prism test C. CBR test D. Slump cone clay 13. Efflorescence test is conducted for burnt clay bricks to find out the A. presence of alkaline substance B. hardness C. soundness D. presence of cracks or holes 14. The apparatus used for determining the Soundness of cement is www.byjusexamprep.com A. Slump cone B. Le Chatelier apparatus C. Vicat’s needle D. UTM 15. The main constituent of cement which is responsible for initial setting of cement is A. Dicalcium silicate B. Tricalcium silicate C. Tricalcium aluminate D. None of the given answers 16. For testing compressive strength of hydraulic cement other than masonry cement as per IS 4031 – Part 6, the size of cube used is A. 150 mm B. 100 mm C. 70.6 mm D. 50 mm 17. Plywood has the advantage of A. Greater tensile strength in longer direction B. Greats-tensile strength in shorter direction C. Same tensile strength in both directions D. None of the given answers 18. A queen closer is A. Full brick B. Longitudinally C. D. brick brick brick 19. Inadequate compacting during concrete casting results in A. Honey combing B. Bleeding C. Segregation D. Bleeding and Segregation 20. The water cement ratio is expressed by A. based on volume of materials B. based on weight of materials C. based on density of materials D. based on percentage of materials used 21. Increased height of building or room give better ventilation due to A. Cross ventilation B. Wind effect C. Stack effect D. Combined effect 22. Effective height of a compound wall having proper foundation on the soil shall be taken as, if ‘H’ is the height of free end of wall from top of the footing. A. 0.85 H B. 1.0 H C. 1.50 H D. 2.00H 23. Direction: Each of the question consist of two statements, one labeled as the ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answer to these items using the www.byjusexamprep.com codes given below: Statement (I): Whereas shutter vibrators are preferred for use with pre-stressed beams, needle vibrators are preferred in foundation concreting. Statement (II): Needle vibrators are susceptible to get dysfunctional with leaking-in of cement slurry – which is not the case with the shutter vibrator. A. Both statement (I) and statement (II) are individually true and statement (II) is the correct explanation of statement (I) B. Both statement (I) and statement (II) are individually true and statement (II) is not the correct explanation of statement (I) C. Statement (I) is true but Statement (II) is false D. Statement (I) is false but statement (II) is true 24. Direction: Each of the question consist of two statements, one labeled as the ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answer to these items using the codes given below: Statement (I): Though a non-elastic material, yet concrete exhibits a linear relationship between stress and strain at low values of stress. Statement (II): The modulus of elasticity of concrete is dependent on the elastic properties of aggregate and on curing. A. Both statement (I) and statement (II) are B. Both statement (I) and statement (II) are individually true and statement (II) is the correct explanation of statement (I) individually true and statement (II) is not the correct explanation of statement (I) C. Statement (I) is true but Statement (II) is false D. Statement (I) is false but statement (II) is true 25. Direction: Each of the question consist of two statements, one labeled as the ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answer to these items using the codes given below: Statement (I): In general, bricks cannot be used in industrial foundations. Statement (II): Heavy duty bricks can withstand higher temperatures. A. Both statement (I) and statement (II) are B. Both statement (I) and statement (II) are individually true and statement (II) is the correct explanation of statement (I) individually true and statement (II) is not the correct explanation of statement (I) C. Statement (I) is true but Statement (II) is false D. Statement (I) is false but statement (II) is true 26. The efficacy of pumpCrete is based primarily on 1) The capacity of pump 2) The aggregate size, which should not exceed 8 cm 3) The diameter of pipe being large, with more than 30 cm being desirable 4) The performance of the agitator A. 1 and 4 only B. 1 and 2 only www.byjusexamprep.com C. 3 and 4 only D. 2 and 3 only 27. When steel reinforcing bars are provided in masonry, the bars shall have an embedment with adequate cover in cement-sand mortar not leaner than A. 1 : 3 B. 1 : 4 C. 1 : 5 D. 1 : 6 28. The carbonation process is demonstrated more by A. Atmospheric corrosion B. Chloride corrosion C. Stress corrosion D. Hydrogen embrittlement 29. The bond between steel and concrete is mainly due to 1) Mechanical resistance 2) Pure adhesive resistance 3) Frictional resistance A. 1 and 2 only B. 1 and 3 only C. 2 and 3 only D. 1, 2 and 3 30. Which of the following statements are correct regarding the pull-out test on concrete? (i) It is performed on hardened concrete (ii) It never causes any damage to the concrete (iii) It can sometimes be considered to be a non-destructive test A. i and ii only B. ii and iii only C. i and iii only D. i, ii and iii www.byjusexamprep.com Solutions 1. C Sol. 2. B Sol. Asbestos cement is a mixture of cement and asbestos. This is usually about 10-15% of the total product, forming a hard material, It is often used as corrugated roofing on sheets garbage and farms. It has very high fire resistance. 3. C Sol. Reverberation time is the time required for the sound to “fade away” of decay in a closed space. It is defined as the time it takes for sound to decay by 60 dB. For a general purpose auditorium, reverberation time is desired to be between 1.5-2.5 second. A reverberation time less than 0.3 second and greater than 5 seconds is considered as very bad. 4. B Sol. High water to cement ratio in concrete is highly workable but is prove to segregation and bleeding. Hence it is also known as weak mix. 5. C Sol. The role of super Plasticizer in a cement paste is to disperse the particles, remove air bubbles and to retard setting 6. A Sol. . Manufacturing of bricks www.byjusexamprep.com Step (1) preparation of brick earth Step (2) moulding Step (3) drying Step (4) burning 7. A Sol. The FM for mix is given as: Let total Quantity be 100 and fine proportion be F. So, coarse proportion = 100-F F = 33.33 8. A Sol. Hardness is defined as the resistance of a material to deformation indentation, or penetration by means such as abrasion, drilling, impact, scratching and/or wear, measured by hardness tests such as brinell, knoop, rockwell or vickers. Thumb-nail and knife scratching test is also done to measure hardness of the material. 9. C Sol. Clinker is obtained as a result of incipient fusion end sintering at a temperature of about 1400 – 1500°C. Because ferric oxide has lower melting point than the other oxides, it acts as a flux. 10. A www.byjusexamprep.com Sol. Properties of alloying elements in stainless steel: (D) Carbon – increase hardness and strength (ii) Manganese – improves hot working properties (iii) Chromium – increase resistance to oxidation or corrosion (iv) Sulphur – improve machinability (v) Molybdenum – improves resistance to pitting 11. B Sol. Drag lines are used to excavate soft earth below ground level. 12. B Sol. Prism test is a laboratory test to calculate the compressive strength of a masonry prism. A masonry prism is an assemblage of masonry units and mortar that is constructed to serve as a test specimen for determining properties. 13. A Sol. Efflorescence test is conducted for burnt clay bricks to find out the presence of alkaline substance. For this the bricks are soaked in water at room temperature. After the water is evaporated check for pressure of white spots (salts) on the brick. It should be <50% of brick area for up to class 12.5 of bricks and <10% for higher classes. 14. B Sol. Soundness test: The purpose of this test is to detect the presence of uncombined lime in cement ‘or’ to www.byjusexamprep.com detect the change in volume of cement after setting. It is performed with the help of: 15. C Sol. Tricalcium aluminate – Initial settling, may even cause false settling if in excess. Does not provide strength. Tricalcium silicate – Responsible for one week strength. Dicalcium silicate – Responsible for 1 year strength. 16. C Sol. For testing compressive strength of cement, the standard size of cube according to IS 4031 – Part 6 is 70.6 mm. 17. C Sol. In plywood, veneers are placed one above the other with the direction of grains on successive layers at right angles. This cross graining of veneers makes the strength of the panel consistent across both directions. 18. B Sol. Queen closer: 19. A Sol. When concrete is not vibrated properly it may leave voids called honey combing. The exposed aggregate leaves a honey comb look and hence the name. 20. B www.byjusexamprep.com Sol. Water cement ratio is expressed in weight of materials since weight is fairly constant whereas volume may change due to change in pressure, temperature or humidity. 21. C Sol. Stack effect or chimney effect is the movement of air into and out of buildings, chimneys, flue gas stacks or other containers, resulting from air buoyancy. Buoyancy occurs due to difference in indoor to outdoor air density resulting from temperature and moisture differences. 22. C Sol. Effective height of a wall having lateral restraint as well as rotational restraint at bottom but no restraint at the top for example parapet walls with RCC roof having adequate bearing on the lower wall, or a compound wall with proper foundation on soil is taken as 1.50 H, where H height of wall from top of the footing. 23. B Sol. Shutter vibrators are clamped rigidly to the form work at the pre-determined points so that the form and concrete are vibrated. They consume more power for a given compaction effect than internal vibrators. These vibrators can compact upto 450mm from the face but have to be moved from one place to another as concrete progress. These vibrators operate at a frequency of 3000 to 9000 rpm at an acceleration of 4g. The external vibrators are more often used for pre-casting of thin in-situ sections of such shape and thickness as can not be compacted by internal vibrators. 24. B Sol. Both the given statements are correct but they are independent (not correct explanation) 25. B Sol. In general, bricks can’t be used in industrial foundations because they cannot resist high temperature in industries. 26. A www.byjusexamprep.com Sol. Efficiency of concrete pump depends on Length of horizontal pipe–300 to 400 m Length of vertical pipe Number of bends Diameter of pipe line (150 mm – 200 mm) Slump of concrete (> 75 mm) Capacity of pump Maximum size of Aggregate = 40 mm Performance of Agitation 27. A Sol. 28. A Sol. Carbonation occur when carbon dioxide from the air penetrates the concrete and reacts with hydroxides www.byjusexamprep.com such as calcium hydroxide to form carbonates This reaction reduces the pH of the pore solution as low as 8.5, at which the passive film on the steel is not stable. 29. D Sol. 1) Mechanical resistance is developed due to bearing stress against the rib. Whereas friction and adhesive property develop at the contact of steel and concrete. 30. C Sol. The pull-out test is performed on hardened concrete and causes some minor damage if performed completely until the bar is pulled out from the concrete. It can still be considered as a non-destructive test if minimum force is applied on the bar to check the level of hardening of the concrete and it is not pulled out.
