Building Materials 1000+ MCQ with answer for RBI Assistant

1. For the manufacture of Portland cement, the proportions of raw materials used, are
A. Lime 63% ; silica 22% ; other ingredients 15%
B. Lime 22% ; silica 63% ; other ingredients 15%
C. Silica 40% ; lime 40% ; other ingredients 20%
D. Silica 70% ; lime 20% ; other ingredients 10%
Answer : A

2. Based on flow quality, the sequence of pipes is
A. A.C. pipes, G.I. pipes, C.I. pipes, PVC pipes
B. C.I. pipes, G.I. pipes, A.C. pipes, PVC pipes
C. C.I. pipes, G.I. pipes, PVC pipes, A.C. pipes
D. None of these
Answer : B

3. The melting point of silica is:
A. 1570°C
B. 1630°C
C. 1730°C
D. 1850°C
Answer : C

4. The thermosetting plastic
A. Becomes rigid when moulded at suitable pressure and temperature
B. At 127°C to 177°C permanently set and further application of heat does not soften it
C. Chars at 343°C
D. All the above
Answer : D

5. Bitumen paints offer
A. Pleasing surface
B. Hard surface
C. Smooth surface
D. Protective surface
Answer : D

6. Assertion A : Pure lime takes a long time to develop adequate strength. Reason R : Pure lime has slow hardening characteristics. Select your answer according to the coding system given below:
A. Both A and R is true and R is correct explanation of A
B. Both A and R is true and R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
Answer : A

7. Quartzite, a metamorphic stone is
A. Hard
B. Brittle
C. Crystalline
D. All the above
Answer : D

8. The wedging is adopted for quarrying costly stratified rock such as
A. Laterite
B. Marble
C. Limestone
D. All the above
Answer : D

9. Quick lime (or caustic lime)
A. Is obtained by the calcination of pure lime stone
B. Has great affinity to moisture
C. Is amorphous
D. All the above
Answer : D

10. Bitumen is generally obtained from
A. Organic material
B. Synthetic material
C. Petroleum product
D. Coal
Answer : C

11. Spirit varnish generally consists of
A. Oil, wax and resin
B. Alcohol, wax and turpentine
C. Pigment and synthetic resin
D. Spirit and shellac
Answer : D

12. Gypsum is a
A. Mechanically formed sedimentary rock
B. Igneous rock
C. Chemically precipitated sedimentary rock
D. Metamorphic rock
Answer : C

13. Stainless steel resists corrosion due to
A. Carbon
B. Sulphur
C. Vanadium
D. Chromium
Answer : D

14. Glazing is used to make earthenware
A. Hard
B. Soft
C. Porous
D. Impervious
Answer : D

15. The main constituent which imparts hydraulicity to hydraulic lime is
A. Calcium oxide
B. Silica
C. Clay
D. Water
Answer : C

16. A well seasoned timber may contain moisture up to
A. 4 to 6 %
B. 6 to 8 %
C. 8 to 10 %
D. 10 to 12 %
Answer : D

17. The initial setting time of hydraulic lime, is
A. 30 minutes
B. 60 minutes
C. 90 minutes
D. 120 minutes
Answer : D

18. During smelting process, the combination of fuel in the furnace
A. Forms carbon dioxide
B. Carbon dioxide with carbon forms carbon mono-oxide
C. Carbon mono-oxide reacts with Fe2O3 to form iron and liberates CO2
D. All the above
Answer : D

19. Brass is an alloy of
A. Copper and zinc
B. Zinc and lead
C. Tin and silver
D. Zinc and nickel
Answer : A

20. Minimum of 40% of iron, is available in
A. Magnetite
B. Red haematite
C. Limonite
D. Black band
Answer : D

21. Bulking of sand is caused due to
A. Surface moisture
B. Air voids
C. Viscosity
D. Clay contents
Answer : A

22. Asphalt is obtained from
A. Petroleum distillation
B. Bitumen distillation
C. Plastic distillation
D. None of these
Answer : A

23. The maximum quantity of calcium chloride used as an accelerator in cement in percentage by weight of cement is
A. 1
B. 2
C. 3
D. 4
Answer : B

24. Hydraulic lime is obtained by
A. Burning of lime stone
B. Burning of kankar
C. Adding water to quick lime
D. Calcination of pure clay
Answer : B

25. Pick up the correct statement from the following:
A. Catalysts are added to assist and accelerate the hardening of resin
B. The fillers are inert materials and they impart strength and hardness
C. Fibrous fillers increase thermal resistance
D. All the above
Answer : D

26. Pick up the correct statement from the following:
A. Air bubbles in casting produce a dull sound by tapping their surfaces lightly with a hammer
B. Cupola furnace is used for the manufacture of cast iron
C. Red short iron is of no value for welding purpose
D. All the above
Answer : D

27. The property by virtue of which lime sets under water, is known as
A. Slacking
B. Setting
C. Hydraulicity
D. Calcining
Answer : C

28. The PVC doors and windows are preferred as they are
A. Rust proof
B. Rot proof
C. Water proof
D. All of these
Answer : D

29. Upto a maximum of 72% of iron, is available in
A. Magnetite
B. Limonite
C. Siderite
D. Iron pyrites
Answer : A

30. The cement becomes unsound by the presence of excess
A. Sulphur
B. Magnesia
C. Lime
D. All of these
Answer : D

31. The compound of Portland cement which contributes to the strength after two to three years is
A. Tri-calcium silicate
B. Di-calcium silicate
C. Tri-calcium aluminate
D. Tetra-calcium alumino ferrite
Answer : B

32. Acrylic is the name of
A. Cellulose resin
B. Alkyd resin
C. Methyl methacrylate
D. Cumarone-indene
Answer : C

33. Portland pozzolana cement possesses
A. Higher resistance to chemical attack
B. Lower heat of hydration
C. Lower shrinkage on drying
D. All the above
Answer : D

34. Minimum required water cement ratio for a workable concrete, is
A. 0.30
B. 0.40
C. 0.50
D. 0.60
Answer : B

35. In a mortar, the binding material is
A. Cement
B. Sand
C. Surkhi
D. Cinder
Answer : A

36. In stone masonry, if stones are so placed that their layers are parallel to the direction of load, they
A. Split easily
B. Are affected by moisture
C. Both (A) and (B)
D. None of these
Answer : C

37. Which of the following sedimentary rocks changes into quartzite by metamorphic action?
A. Sand stone
B. Lime stone
C. Shale
D. Gypsum
Answer : A

38. Which of the following is the purest form of iron?
A. Cast iron
B. Wrought iron
C. Mild steel
D. High carbon steel
Answer : B

39. Lime mortar is generally made with
A. Quick lime
B. Fat lime
C. Hydraulic lime
D. Plain lime
Answer : C

40. Elastomers can extend upto
A. Five times their original dimensions
B. Seven times their original dimensions
C. Ten times their original dimensions
D. Three times their original dimensions
Answer : C

41. The most commonly used retarder in cement is
A. Gypsum
B. Calcium chloride
C. Calcium carbonate
D. None of the above
Answer : A

42. Based on its dry weight, a freshly felled tree may contain water
A. 25 %
B. 50 %
C. 75 %
D. 100 %
Answer : D

43. The basic purpose of a retarder in concrete is
A. To increase the initial setting time of cement paste in concrete
B. To decrease the initial setting time of cement paste in concrete
C. To render the concrete more water tight
D. To improve the workability of concrete mix
Answer : A

44. Which of the following has more fire resisting characteristics?
A. Marble
B. Lime stone
C. Compact sand stone
D. Granite
Answer : C

45. For filling cracks in masonry structures, the type of bitumen used, is
A. Cut-back bitumen
B. Bitumen-emulsion
C. Blown bitumen
D. Plastic bitumen
Answer : D

46. The stretcher bond in brick masonry can be used only when the thickness of wall is
A. 90 mm
B. 180 mm
C. 190 mm
D. 280 mm
Answer : A

47. Excess of alumina in brick earth makes the brick
A. Impermeable
B. Brittle and weak
C. To lose cohesion
D. To crack and warp on drying
Answer : D

48. To give a brilliant finish, the type of varnish used, is
A. Water varnish
B. Spirit varnish
C. Turpentine varnish
D. Oil varnish
Answer : B

49. The most important constituent of varnish, is
A. Drier
B. Solvent
C. Resin
D. All the above
Answer : D

50. The proportions of lime and sand in the mortar normally used in brick construction are
A. 1 : 2
B. 1 : 4
C. 1 : 6
D. 1 : 8
Answer : A