Building Materials 1000+ MCQ with answer for RBI Grade B officer

1. The most commonly used base for timber painting, is
A. Red lead
B. Zinc white
C. White lead
D. Titanium white
Answer : C

2. The presence of sand in brick earth prevents:
A. Cracking of bricks
B. Shrinkage of bricks
C. Warping of bricks
D. None of these
Answer : C

3. 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

4. Quartzite is a
A. Metamorphic rock
B. Argillaceous rock
C. Calcareous rock
D. Siliceous rock
Answer : D

5. Bitumen felt
A. Is used as water proofing material
B. Is used as damp proofing material
C. Is made from bitumen and hessian fibres
D. All the above
Answer : D

6. Pug mill is used for
A. Preparation of clay
B. Moulding of clay
C. Drying of bricks
D. Burning of bricks
Answer : A

7. The trunk of tree left after cutting all the branches is known as
A. Log
B. Batten
C. Plank
D. Baulk
Answer : A

8. 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

9. Pick up the correct statement from the following: Method of sawing timber
A. Tangentially to annual rings, is known as tangential method
B. In four quarters such that each board cuts annual rings at angles not less than 45°, is known as quarter sawing method
C. Cut out of quarter logs, parallel to the medullary rays and perpendicular to annual rings, is known as radial sawing
D. All the above
Answer : D

10. In order of increasing percentage of silica, the correct sequence is
A. Sandy clay, calcareous clay, pure clay
B. Calcareous clay, pure clay, sandy clay
C. Pure clay, sandy clay, calcareous clay
D. None of these
Answer : B

11. For light and ornamental casting, the most unsuitable pig iron, is
A. Bessemer pig
B. Grey or foundry pig
C. White or forge pig
D. Mottled pig
Answer : D

12. Sapwood consists of
A. Innermost annular rings around the pith
B. Portion of timber between heartwood and cambium layer
C. Thin layers below the bark
D. Thin fibre which extends from the pith outwards and holds the annular rings together
Answer : B

13. Soundness of cement is tested by
A. Vicat's apparatus
B. Le-chatelier apparatus
C. Compressive strength testing apparatus
D. None of these
Answer : B

14. The internal size of mould used in brick preparation is
A. Equal to the size of a fully burnt brick
B. Smaller than the size of a fully burnt brick
C. Greater than the size of a fully burnt brick
D. None of the above
Answer : C

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

16. Plywood is normally available
A. 1 mm thick
B. 2 mm thick
C. 2 to 3 mm thick
D. 3 mm to 4 mm thick
Answer : D

17. Paints with white lead base are suitable for painting of
A. Wood work
B. Iron work
C. Both wood work and iron work
D. None of the above
Answer : A

18. 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

19. The hardest rock is
A. Marble
B. Diamond
C. Talc
D. Quartz
Answer : B

20. Wrought iron contains carbon about
A. 1.5% to 5.5%
B. 0.5% to 1.75%
C. 0.1% to 0.25%
D. None to these
Answer : C

21. The rocks which are formed due to cooling of magma at a considerable depth from earth's surface are called
A. Plutonic rocks
B. Hypabyssal rocks
C. Volcanic rocks
D. Igneous rocks
Answer : A

22. Inner part of a timber log surrounding the pitch, is called
A. Sapwood
B. Cambium layer
C. Heart wood
D. None to these
Answer : C

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

24. Pick up the correct statement from the following:
A. Acid test is done to find out the weathering quality of stones
B. Attrition test is done to find out the rate of wear of stones which are used in road construction
C. Crushing test is done to find out the compressive strength of the stone
D. All the above
Answer : D

25. Bitumen may be dissolved in
A. Carbondioxide
B. Water
C. Sodium chloride
D. Carbon disulphide
Answer : D

26. Asbestos
A. Is an excellent insulator for heat and electricity
B. Is fire-proof and acid proof
C. Has sp. gravity equal to 3.10
D. All the above
Answer : D

27. If the furnace is provided with insufficient fuel at low temperatures, the type of pig iron produced, is called
A. Bessemer pig
B. Grey or foundry pig
C. White or forge pig
D. Mottled pig
Answer : C

28. Non acid-resistant asbestos is:
A. Tremolite asbestos
B. Chrysotile asbestos
C. Amosite asbestos
D. None of these
Answer : B

29. 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

30. In arches, stratified stones are placed so that their planes are
A. Parallel
B. Perpendicular
C. Radial
D. None of these
Answer : C

31. The variety of pig iron used for manufacture of wrought iron, is
A. Bessemer pig
B. Grey or foundry pig
C. White forge pig
D. Mottled pig
Answer : C

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

33. The ultimate tensile strength of structural mild steel is about
A. 160 N/mm²
B. 260 N/mm²
C. 420 N/mm²
D. 520 N/mm²
Answer : C

34. Bitumen completely dissolves in
A. Carbon bisulphide
B. Chloroform
C. Coal tar
D. All of these
Answer : D

35. Due to attack of dry rot, the timber
A. Cracks
B. Shrinks
C. Reduces to powder
D. None of these
Answer : C

36. Plywood is obtained by gluing wooden sheets at
A. 100 to 150 N/cm2
B. 100 to 130°C
C. Both (A) and (B)
D. Neither (A) nor (B)
Answer : C

37. The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as
A. Cementation process
B. Crucible process
C. Bessemer process
D. Open hearth process
Answer : B

38. If water required for 1 bag of cement is 30 litres, the water cement ratio is:
A. 0.40
B. 0.50
C. 0.60
D. None of these
Answer : C

39. The slag which floats on the surface of the molten iron generally contains
A. Lime (CaO) 45%
B. Silica (SiO₂) 35%
C. Alumina (Al₂O₃) 12% and MgO, CaSO₄, KMnO₂ and FeO 8%
D. All the above
Answer : D

40. The ratio of the thickness of web to that of flange of steel rolled structural beams and channels is
A. Less than 1
B. Equal to 1
C. Greater than 1
D. Less than 1 in beams but greater than 1 in channels
Answer : A

41. Fibre glass
A. Retains heat-longer
B. Has a higher strength to weight ratio
C. Is shock proof and fire retardant
D. All the above
Answer : D

42. The stone suitable for rubble masonry should be.
A. Hard
B. Tough
C. Heavy
D. Light
Answer : A

43. Plywood is made by bonding together thin layers of wood in such a way that the angle between grains of any layer to grains of adjacent layers is
A. 0°
B. 30°
C. 45°
D. 90°
Answer : D

44. The main constituent of fly-ash, is
A. Aluminium oxide
B. Silica
C. Ferrous oxide
D. All of these
Answer : D

45. The main ingredient of a good quality brick earth, is
A. Magnesia
B. Lime
C. Silica
D. Alumina
Answer : D

46. For a 50 kg cement bag water required, is
A. 16.5 litres
B. 18.5 litres
C. 20.5 litres
D. 22.5 litres
Answer : D

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

48. Which of the following should be used for hearting of thicker walls?
A. Headers
B. Stretchers
C. Brick bats
D. Queen closer
Answer : A

49. The silica is used for preparing
A. Silica bricks
B. Coke oven
C. Lining for glass furnaces
D. All of these
Answer : D

50. A badly mixed cement concrete results in
A. Segregation
B. Bleeding
C. Honey combing
D. None of these
Answer : C