Concrete Technology Mock test – 5 || Civil Engineering Mock tests Welcome to your Concrete Technology Mock test - 5 Take an exciting test in Concrete Technology You have only 20 mins to complete the test (25 Questions) Wish you all the best!!! Name Email 1. The ratio of the diameter of reinforcing bars and the slab thickness is (A) 1/4 (B) 1/5 (C) 1/6 (D) 1/82. For a continuous slab of 3 m × 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 mm3. If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is (A) 15,900 litres (B) 16,900 litres (C) 17,900 litres (D) 18,900 litres4. Pick up the correct statement from the following: (A) Calcium chloride acts as a retarder (B) Calcium chloride acts as an accelerator (C) Gypsum (calcium sulphate) acts as a retarder (D) Both (b) and (c)5. The operation of removing humps and hollows of uniform concrete surface, is known as (A) Floating (B) Screeding (C) Trowelling (D) Finishing6. The ratio of various ingredients (cement, sand, aggregates) in concrete of grade M 200, is (A) 1 : 2 : 4 (B) 1 : 3 : 6 (C) 1 : 1½ : 3 (D) 1 : 1 : 27. The datum temperature for maturity by Plowman, is (A) 23°C (B) 0° (C) - 5.6°C (D) - 11.7°C8. For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is (A) 1 : 3 : 6 (B) 1 : 1½ : 3 (C) 1 : 2 : 4 (D) 1 : 1 : 29. 1% of voids in a concrete mix would reduce its strength by about (A) 5 % (B) 10 % (C) 15% (D) 20 %10. The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for obtaining the aggregates of F.M. 5.4, is (A) 30 % (B) 40 % (C) 50% (D) 60 %11. The most useless aggregate is one whose surface texture is (A) Smooth (B) Granular (C) Glassy (D) Honey combed and porous12. The final operation of finishing floors, is known as (A) Screeding (B) Floating (C) Trowelling (D) Finishing13. The bulk density of aggregates, is generally expressed as (A) tonnes/cubic metre (B) kg/cubic metre (C) kg/litre (D) g/cm314. The top diameter, bottom diameter and the height of a slump mould are: (A) 10 cm, 20 cm, 30 cm (B) 10 cm, 30 cm, 20 cm (C) 20 cm, 10 cm, 30 cm (D) 20 cm, 30 cm, 10 cm15. Vicat's apparatus is used for (A) Fineness test (B) Consistency test (C) Setting time test (D) Soundness test16. Slump test of concrete is a measure of its (A) Consistency (B) Compressive strength (C) Tensile strength (D) Impact value17. The ratio of the length to breadth of a wooden float, is (A) 4.5 (B) 5.5 (C) 6.5 (D) 7.518. For concreting tunnel linings, transportation of concrete is done by (A) Pans (B) Wheel borrows (C) Containers (D) Pumps19. The grade of concrete not recommended by I.S. : 456, is (A) M 100 (B) M 200 (C) M 300 (D) M 50020. Slump test of concrete is a measure of its (A) Consistency (B) Compressive strength (C) Tensile strength (D) Impact value21. For an ordinary Portland cement (A) Residual does not exceed 10% when sieved through IS Sieve No. 9 (B) Soundness varies from 5 to 10 mm (C) Initial setting time is not less than 30 minutes (D) Compressive stress after 7 days, is not less than 175 kg/cm222. Transport of concrete by pumps, is done for a distance of (A) 100 m (B) 200 m (C) 300 m (D) 400 m23. Maximum percentage reinforcement in case of slabs is limited to (A) 2 (B) 4 (C) 6 (D) 824. An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. sieve No. 9, more than (A) 5 % (B) 10 % (C) 15% (D) 20 %25. Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is (A) 30 % (B) 40 % (C) 50% (D) 60 % Share to all