Building Materials Quick Revision

🔴 BUILDING MATERIALS — MCQs (WITH ANSWERS) 1. Increase in cement fineness mainly causes A. Increase in strength always B. Decrease in heat of hydration C. Increase in heat and shrinkage D. No effect on setting Answer: C --- 2. False set in cement A. Reduces strength permanently B. Is same as flash set C. Can be removed by remixing D. Occurs due to excess water Answer: C --- 3. Unsoundness in cement is mainly caused by excess A. Gypsum B. Silica C. Magnesium oxide D. Alumina Answer: C --- 4. Increase in C three A content in cement results in A. Higher sulphate resistance B. Lower sulphate resistance C. Higher long-term strength D. Lower heat of hydration Answer: B --- 5. Le Chatelier test is used to detect A. Free lime only B. Magnesium oxide only C. Both free lime and magnesium oxide D. Gypsum content Answer: A --- 6. Frog in a brick is provided mainly to A. Increase compressive strength B. Reduce efflorescence C. Improve bond with mortar D. Reduce water absorption Answer: C --- 7. Efflorescence in bricks generally affects A. Strength B. Durability C. Appearance D. Shape Answer: C --- 8. Over-burnt bricks are characterized by A. Low strength and good bonding B. High strength and poor bonding C. Low density and high absorption D. Uniform red colour Answer: B --- 9. Bricks during service life generally A. Shrink continuously B. Expand slightly C. Remain dimensionally stable D. Disintegrate Answer: B --- 10. Hardness of stone should not be confused with A. Strength B. Durability C. Toughness D. Porosity Answer: C --- 11. Presence of feldspar in stone mainly increases A. Strength B. Durability C. Resistance to weathering D. Decay Answer: D --- 12. Higher porosity of stone results in A. Higher durability B. Lower durability C. Higher strength D. No effect Answer: B --- 13. Hydraulic lime sets mainly due to A. Carbonation B. Silicates and aluminates C. Gypsum reaction D. Drying Answer: B --- 14. Fat lime compared to hydraulic lime shows A. Faster strength gain B. Less shrinkage C. More shrinkage D. Higher durability Answer: C --- 15. Strength of timber is maximum A. Perpendicular to grain B. Parallel to grain C. Same in all directions D. Along knots Answer: B --- 16. Maximum shrinkage in timber occurs in A. Longitudinal direction B. Radial direction C. Tangential direction D. Diagonal direction Answer: C --- 17. Seasoning of timber mainly reduces A. Density B. Weight C. Strength D. Durability Answer: B --- 18. Galvanizing protects steel mainly by A. Barrier action only B. Painting effect C. Sacrificial protection D. Heat resistance Answer: C --- 19. Fatigue failure in steel usually occurs A. Above yield stress B. At ultimate stress C. Below yield stress D. Only under static load Answer: C --- 20. Higher penetration value of bitumen indicates A. Harder bitumen B. Softer bitumen C. More ductile bitumen D. Higher flash point Answer: B --- 21. Ductility test of bitumen measures A. Hardness B. Temperature susceptibility C. Cohesion D. Viscosity Answer: C --- 22. Bitumen emulsion is preferred when aggregates are A. Hot B. Dry C. Wet D. Coarse only Answer: C --- 23. Bulking of sand is maximum in A. Fine sand B. Medium sand C. Coarse sand D. Gravel Answer: B --- 24. Rounded aggregates mainly improve A. Strength B. Durability C. Workability D. Bond strength Answer: C --- 25. Toughened glass A. Can be cut after manufacture B. Breaks into sharp pieces C. Cannot be cut after treatment D. Is laminated glass Answer: C --- 26. Laminated glass is preferred for safety because A. It is tougher B. It is fire resistant C. It holds fragments together D. It is cheaper Answer: C --- 27. Most paint failures occur due to A. Poor paint quality B. Poor surface preparation C. Wrong colour selection D. Excess drier Answer: B --- 28. Chalking of paint is caused by A. Moisture B. Fungal attack C. Ultraviolet exposure D. Poor adhesion Answer: C --- 29. Fly ash in concrete mainly helps in A. Increasing heat of hydration B. Reducing workability C. Improving workability D. Increasing early strength Answer: C --- 30. Laterite stone becomes hard mainly due to A. Water absorption B. Carbonation C. Exposure to air D. Burning Answer: C --- How to use this set (strict) Any wrong answer → revise the related Red Zone line three times Target accuracy above 85 percent