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1) As compared to ordinary portland cement, high alumina cement has______________? a. higher initial setting time but lower final setting time b. lower initial setting time but higher final setting time c. higher initial and final setting times d. lower initial and final setting times
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2) Bulking of sand is maximum if moisture content is about____________? a. 2 % b. 4% c. 6% d. 10%
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3) 1% of voids in a concrete mix would reduce its strength by about______________? a. 5% b. 10 % c. 15% d. 20%
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4) Finer grinding of cement______________? a. affects only the early development of strength b. affects only the ultimate strength c. both (A. and (B. d. does not affect the strength
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5) Poisson’s ratio for concrete_______________? a. remains constant b. increases with richer mixes c. decreases with richer mixes d. none of the above
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6) The factor of safety for______________? a. steel and concrete are same b. steel is lower than that for concrete c. steel is higher than that for concrete d. none of the above
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7) The fineness modulus of fine aggregate is in the range of______________? a. 2.0 to 3.5 b. 3.5 to 5.0 c. 5.0 to 7.0 d. 6.0 to 8.5
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8) The compressive strength of 100 mm cube as compared to 150 mm cube is always_______________? a. less b. more c. equal d. none of the above
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9) If a beam fails in bond, then its bond strength can be increased most economi-cally by___________? a. increasing the depth of beam b. using thinner bars but more in number c. using thicker bars but less in number d. providing vertical stirrups
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10) If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called________________? a. balanced beam b. under-reinforced beam c. over-reinforced beam d. none of the above
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11) If the permissible stress in steel in tension is 140 N/mm2, then the depth of neutral axis for a singly reinforced rectangular balanced section will be___________________? a. 0.35 d b. 0.40 d c. 0.45 d d. dependent on grade of concrete also
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12) Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is_____________? a. M15 b. M20 c. M 10 d. M25
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13) Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is_______________? a. 28 liters b. 30 liters c. 32 liters d. 34 liters
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14) For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be________________? a. 0.75-0.80 b. 0.80-0.85 c. 0.85 – 0.92 d. above 0.92
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15) In case of hand mixing of concrete, the extra cement to be added is__________________? a. 5% b. 10% c. 15% d. 20%
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16) The individual variation between test strength of sample should not be more than______________? a. ±5% of average b. ± 10% of average c. ± 15% of average d. ±20% of average
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17) For walls, columns and vertical faces of all structural members, the form work is generally removed after_______________? a. 24 to 48 hours b. 3 days c. 7 days d. 14 days
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18) For walls, columns and vertical faces of all structural members, the form work is generally removed after______________? a. 24 to 48 hours b. 3 days c. 7 days d. 14 days
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19) One of the criteria for the effecvve width of flange of T-beam is bf =—+ bw +6Df 6 In above formula, l0 signifies_______________? a. effective span of T-beam b. distance between points of zero moments in the beam c. distance between points of maximum moments in the beam d. clear span of the T-beam
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20) For a continuous slab of 3 m x 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is__________________? a. 50 mm b. 75 mm c. 100 mm d. 120 mm
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