1000+ Building Materials MCQ for RRB Group D [Solved]

1. The type of steel used for precision levelling staff, is
A. Titanium steel
B. Carbon steel
C. Invar
D. Stainless steel
Answer : C

2. The commonly used base for iron and steel work, is
A. Red lead
B. Zinc white
C. White lead
D. Titanium white
Answer : A

3. Pick up the most favourable condition for the rapid growth of fungus for dry rot from the following:
A. Absence of sun light
B. Dampness
C. Presence of sap
D. All the above
Answer : D

4. The pigment used in paints for corrosive resistance, is
A. White lead
B. Ferrous oxide
C. Zinc white
D. Red lead
Answer : D

5. The practical limit of moisture content achieved in air drying of timber is
A. 5 %
B. 15 %
C. 25 %
D. 35 %
Answer : B

6. Initial setting of cement is caused due to
A. Tri-calcium silicate
B. Di-calcium silicate
C. Tri-calcium aluminate
D. Tetra calcium alumino ferrite
Answer : C

7. Soundness test of cement determines
A. Quality of free lime
B. Ultimate strength
C. Durability
D. Initial setting
Answer : A

8. Permanent magnets are made of high carbon steel and
A. 15% of cobalt
B. 20% of cobalt
C. 35% of cobalt
D. 45% of cobalt
Answer : D

9. A queen closer is a
A. Brick laid with its length parallel to the face or direction of wall
B. Brick laid with its breadth parallel to the face or direction of wall
C. Brick having the same length and depth as the other bricks but half the breadth
D. Brick with half the width at one end and full width at the other
Answer : C

10. Second class bricks
A. Are of dark brown colour
B. Produce a metallic sound when struck
C. Are well burnt
D. Are under burnt
Answer : B

11. For slaking of 10 kg of CaO, the theoretical amount of water is
A. 2.2 kg
B. 1.5 kg
C. 3.2 kg
D. None of these
Answer : C

12. Pick up the correct statement from the following:
A. Solder material is an alloy which melts at a temperature above 400°C
B. Brazing is done at temperature above 600°C to 1100°C
C. Brazing joint is stronger than the solder joint
D. All the above
Answer : D

13. Calcination of iron ores is done
A. To remove moisture
B. To remove carbonic acid
C. By roasting in heaps
D. All the above
Answer : D

14. Pig iron is manufactured from the ores by
A. Dressing
B. Calcination and roasting
C. Smelting
D. All the above
Answer : D

15. The rocks having alumina or clay as their major constituents are known as
A. Siliceous rocks
B. Argillaceous rocks
C. Calcareous rocks
D. Sedimentary rocks
Answer : B

16. Stones used for rubble masonry must be
A. Soft
B. Hard
C. Light
D. Heavy
Answer : B

17. For testing compressive strength of cement, the size of cube used is
A. 50 mm
B. 70.6 mm
C. 100 mm
D. 150 mm
Answer : A

18. For sanitary pipes and chemical stonewares,
A. Salt glazing is used
B. Lead glazing is used
C. Opaque glazing is used
D. None of these
Answer : A

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

20. Le-Chatelier's device is used for determining the
A. Setting time of cement
B. Soundness of cement
C. Tensile strength of cement
D. Compressive strength of cement
Answer : B

21. Pick up the correct statement from the following:
A. Bull's trench kiln a trench excavated in ground
B. Hoffman's kiln is constructed over ground
C. Tunnel Kiln is constructed as a tunnel
D. All the above
Answer : D

22. Spalling hammer is used for
A. Driving wooden headed chisels
B. Rough dressing of stones
C. Carving of stones
D. Breaking small projection of stones
Answer : B

23. Stones used for ornamental work must be
A. Soft
B. Hard
C. Light
D. Heavy
Answer : A

24. A bull nose brick is not used for
A. Rounding off sharp corners
B. Pillars
C. Decoration purpose
D. Arches
Answer : D

25. Plywood has the advantage of
A. Greater tensile strength in longer direction
B. Greater tensile strength in shorter direction
C. Same tensile strength in all directions
D. None of the above
Answer : C

26. The most important tool in brick laying for lifting and spreading mortar and for forming joints is
A. Trowel
B. Square
C. Bolster
D. Scutch
Answer : A

27. The moisture content in a well seasoned timber is
A. 4 % to 6 %
B. 10 % to 12 %
C. 15 % to 20 %
D. 100 %
Answer : B

28. Duco paints are
A. Plastic paints
B. Cellulose paints
C. Emulsion paints
D. Oil paints
Answer : D

29. Mastic asphalt is generally used for
A. Damp proof course
B. Water proof layer
C. Partition walls
D. Both (A) and (B)
Answer : D

30. Which of the following trees yields hard wood?
A. Deodar
B. Chir
C. Shishum
D. Pine
Answer : C

31. Proper amount of entrained air in concrete results in (i) Better workability (ii) Better resistance to freezing and thawing (iii) Lesser workability (iv) Less resistance to freezing and thawing The correct answer is
A. (i) and (ii)
B. (i) and (iv)
C. (ii) and (iii)
D. (iii) and (iv)
Answer : A

32. Duco is one of the patent forms of
A. Emulsion paints
B. Plastic paints
C. Bituminous paints
D. Cellulose paints
Answer : D

33. Pick up the correct statement from the following:
A. The average crushing strength of hand moulded bricks is 6000 t/m2
B. The average tensile strength of hand moulded brick is 200 t/m2
C. The average shearing strength of hand moulded brick is 600 t/m2
D. All the above
Answer : D

34. During pudding
A. Molten metal is kept clear of the fuel
B. Carbon is converted into carbonic acid gas
C. Silicon forms a slag
D. All the above
Answer : D

35. Pick up the correct statement from the following:
A. Rusting is caused due to combined action of air, moisture and carbon dioxide
B. During rusting, first ferrous bicarbonates are formed
C. On further oxidation ferrous bicarbonates get converted to ferric bicarbonates
D. All the above
Answer : D

36. 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

37. 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

38. The steel used in R.C.C. work is
A. Stainless steel
B. Mild steel
C. High carbon steel
D. Wrought iron
Answer : B

39. Percentage of carbon content in mild steel is
A. Less than 0.25
B. Between 0.25 and 0.7
C. Between 0.7 and 1.5
D. Greater than 1.5
Answer : A

40. The plywood
A. Has good strength along the panel only
B. Can be spilt in the plane of the panel
C. Has greater impact resistance to blows than ordinary wood
D. Cannot be bent more easily than ordinary wood of same thickness
Answer : C

41. PVC stands for
A. Plastic very compact
B. Polythene vinyl chloride
C. Polythene vinyl carbon
D. Polythene vanadium carbide
Answer : B

42. The cracks caused by shrinkage of the exterior surface of the wood exposed to atmosphere, are called:
A. Radial shakes
B. Heart shakes
C. Wind cracks
D. Twisted fibres
Answer : C

43. Vanadium steel is generally used for
A. Railway switches and crossing
B. Bearing balls
C. Magnets
D. Axles and springs
Answer : D

44. Smith's test of stones is performed to find out
A. The presence of soluble matter of stone
B. The compressive strength of the stone
C. The hardness of the stone
D. The toughness of the stone
Answer : A

45. 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

46. Wrought iron is used for
A. Structural works in beams
B. Small sized water pipes
C. Columns and struts
D. None to these
Answer : B

47. Depending on the chemical composition and mechanical properties, iron may be classified as
A. Cast iron
B. Wrought iron
C. Steel
D. All the above
Answer : D

48. Which of the following cements contains maximum percentage of dicalcium silicate?
A. Ordinary Portland cement
B. Low heat cement
C. Rapid hardening cement
D. Sulphate resisting cement
Answer : B

49. Rapid hardening cement attains early strength due to
A. Larger proportion of lime grounded finer than normal cement
B. Lesser proportion of lime grounded coarser than normal cement
C. Lesser proportion of lime grounded finer than normal cement
D. Excess percentage of gypsum
Answer : A

50. The frog of the brick in a brick masonry is generally kept on
A. Bottom face
B. Top face
C. Shorter side
D. Longer side
Answer : B