Civil Engineering Concrete Technology Mock test – 2 Welcome to your Concrete Technology Mock test - 2 Take an exciting test in the topic of Concrete Technology You have only 20 mins to complete the test (25 Questions) Wish you all the best!!! Name Email 1. Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is A. 30% B. 40% C. 50% D. 60% E. 70%2. Batching error means inaccuracy in the quantity of A. aggregates B. cement C. water D. all the above.3. Pick up the incorrect statement from the following: A. The bottom and top ends of slump mould are parallel to each other B. The axis of the mould is perpendicular to the end faces C. The internal surface of the mould is kept clean and free from set cement D. The mould is in the form of a frustum of hexagonal pyramid4. The maximum thickness of concrete floor of a cement warehouse, is A. 10 cm B. 15 cm C. 20 cm D. 25 cm E. 30 cm5. An aggregate is said to be flaky, if its least dimension is less than A. 2/3 mean dimension B. 3/4 mean dimension C. 3/5 mean dimension D. 5/8 mean dimension E. none of these.6. Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is A. 30% B. 40% C. 50% D. 60% E. 70%7. Ordinary concrete is not used for concrete grade A. M 100 B. M 150 C. M 200 D. M 250 E. M 4008. For construction of structures in sea water, the cement generally preferred to, is A. Portland-pozzolana cement B. quick setting cement C. low heat Portland cement D. rapid hardening cement E. none of these.9. The light weight aggregates are obtained from A. sedimentary rocks B. metamorphic rocks C. igneous rocks D. volcanic source.10. The final operation of finishing floors, is known as A. screeding B. floating C. trowelling D. finishing11. ISI has specified full strength of concrete after A. 7 days B. 14 days C. 21 days D. 28 days E. none of these.12. Separation of coarse aggregates from mortar during transportation, is known A. bleeding B. creeping C. segregation D. shrinkage E. none of these.13. According to the recommendations of IS : 456-1978, the expansion joints A. are provided where plane changes abruptly B. are provided to ensure minimum resistance C. are supported on separate columns D. do not carry reinforcement across them E. all the above.14. C.R.R.I. charts are used to obtain a relatioship between strength of concrete and A. water cement ratio B. workability C. grading of aggregate D. fineness modulus E. none of these.15. You are asked to construct a massive dam, the type of cement you will use, is A. ordinary Portland cement B. rapid hardening cement C. low heat cement D. blast furnace slag cement E. white cement.16. Hardening of cement occurs at A. rapid rate during the first few days and afterwards it continues to increase at a decreased rate B. slow rate during the first few days and afterwards it continues to increase at a rapid rate C. uniform rate throughout its age D. none of these.17. 1S. Sieve Nos. 10 mm and 4.75 mm are geneally used for grading of A. coarse aggregates B. fine aggregates C. neither (a) nor (b) D. both (a) and (b) E. none of these.18. Too wet concrete may cause A. weakness of concrete B. excessive laitance C. segregation D. lower density E. all the above.19. Addition of pozzolana to cement A. decreases workability B. increases strength C. increases heat of hydration D. decreases curing time E. none of these.20. Specified compressive strengh of concrete is obtained from cube tests at the end of A. 3 days B. 7 days C. 14 days D. 21 days E. 28 days.21. Water required per bag of cement, is A. 7 kg B. 14 kg C. 21 kg D. 28 kg E. 35 kg22. Pick up the incorrect statement from the following: A. A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive equantity of water B. The strength of concrete decreases as the water cement ratio increases C. If the water cement ratio is less than 0.45, the concrete is not workable and causes honey-combed structure D. Good compaction by mechanical vibrtions, increases the strength of concrete23. Pick up the correct statement from the following: A. Segregation is necessary for a workable concrete B. Consistency does not affect the workability of concrete C. If the slump increases, workability decreases D. If the concrete mix is dry, the slump is maximum E. None of these.24. For compacting plain concrete road surface of thickness less than 20 cm, we use A. internal vibrator B. screed vibrator C. form vibrator D. none of these.25. Workability of concrete for a given water content is good if the aggregates, are A. rounded aggregate B. irregular aggregate C. angular aggregate D. flaky aggregates.