Building Materials 1000+ MCQ with answer for RRB ALP

1. Early attainment of strength in rapid hardening cement is mainly due to
A. Gypsum
B. Finer grinding
C. Tri-calcium silicate
D. Tri-calcium aluminate
Answer : B

2. Pegmatite is a/an
A. Intrusive igneous rock
B. Extrusive igneous rock
C. Sedimentary rock
D. Metamorphic rock
Answer : A

3. Slump test for concrete is carried out, to determine
A. Strength
B. Durability
C. Workability
D. Water content
Answer : C

4. 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

5. The process of mixing clay, water and other ingredients to make brick is known as
A. Kneading
B. Moulding
C. Pugging
D. Drying
Answer : A

6. The low voltage porcelain is mainly used for
A. Switch block
B. Insulating tubes
C. Lamp sockets
D. All of these
Answer : D

7. Chemically, marble is known as
A. Metamorphic rock
B. Argillaceous rock
C. Calcareous rock
D. Siliceous rock
Answer : C

8. Pick up the correct statement from the following:
A. The percentage of absorption for firebricks varies from 5 to 10
B. The percentage of silica in silica bricks is to the extent of about 95 to 97 percent
C. Roughly 1 to 2 percent of lime in silica bricks is added to act as binding material
D. All the above
Answer : D

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

10. The specific gravity of marble, is
A. 2.50
B. 2.60
C. 2.66
D. 2.72
Answer : D

11. Asbestos is
A. Corrugated sheet used for roofing
B. An incombustible fire proof material
C. An organic substance
D. All the above
Answer : D

12. Which of the following gradients exerts maximum influence on properties of steel?
A. Iron
B. Carbon
C. Manganese
D. Sulphur
Answer : B

13. The vehicle used in case of enamel paints is usually
A. Linseed oil
B. Water
C. Varnish
D. None of the above
Answer : C

14. Cement paints usually
A. Contain hydrated lime
B. Contain 5% to 10% colour pigments
C. Contain 5% sodium chloride
D. All the above
Answer : D

15. Pick up the correct statement from the following:
A. The lime in excess makes the cement unsound and causes the cement to expand and disintegrate
B. The silica in excess makes the cement stronger but its setting time also increases
C. The excess amount of alumina weakens the cement
D. All the above
Answer : D

16. The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to
A. Grey cast iron
B. White cast iron
C. Mottled cast iron
D. Toughed cast iron
Answer : C

17. 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

18. The rocks which are formed due to pouring of magma at the earth's surface are called
A. Plutonic rocks
B. Hypabyssal rocks
C. Volcanic rocks
D. Igneous rocks
Answer : C

19. Asbestos cement
A. Is brittle
B. Warps due to changes in humidity
C. Strength is lowered when saturated by water
D. All of the above
Answer : D

20. The initial setting time for ordinary Portland cement as per IS specifications should not be less than
A. 10 minutes
B. 30 minutes
C. 60 minutes
D. 600 minute
Answer : B

21. 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

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

23. 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

24. 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

25. The usual percentages of clay and metal in cermet are:
A. 50%, 50%
B. 60%, 40%
C. 70%, 30%
D. 80%, 20%
Answer : D

26. Pozzolana (or surkhi) is used in lime
A. To impart hydraulicity
B. To prevent shrinkage
C. To decrease the cost of construction
D. To decrease the setting time
Answer : A

27. Which one of the following is used for preparing porcelain?
A. Clay
B. Feldspar
C. Quartz
D. All of these
Answer : D

28. Commonly used thinner in
A. Lacquer paints, is alcohol
B. Cellulose paints is ethyl acetate
C. Oil paints, is naphtha
D. All the above
Answer : D

29. If the iron ore contains clay as an impurity, the flux added during calcination, is
A. Clay
B. Lime stone
C. Argillaceous iron ore
D. All the above
Answer : B

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

31. 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

32. Pick up the correct statement regarding low heat cement from the following:
A. It possesses less compressive strength
B. Its initial setting time is about one hour
C. Its final setting time is about 10 hours
D. All the above
Answer : D

33. Rocks formed due to alteration of original structure due to heat and excessive pressure are called
A. Sedimentary rocks
B. Igneous rocks
C. Metamorphic rocks
D. None of these
Answer : C

34. 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

35. A 1st class brick immersed in water for 24 hours, should not absorb water (by weight) more than
A. 10 %
B. 15 %
C. 20 %
D. 25 %
Answer : C

36. Seasoning of timber is done for
A. Increasing moisture content
B. Decreasing moisture content
C. Increasing strength of timber
D. None to these
Answer : B

37. Bullet proof glass is made of thick glass sheet sandwiched by a layer of
A. Steel
B. Stainless steel
C. High test plastic
D. Chromium plate
Answer : C

38. Slacking of lime is affected by
A. Keeping it exposed to air
B. Immersing the lime in water
C. Crushing the lime lumps
D. None of these
Answer : B

39. Three basic raw materials which are needed in large quantities for production of steel are
A. Iron ore, coal and sulphur
B. Iron ore, carbon and sulphur
C. Iron ore, coal and lime stone
D. Iron ore, carbon and lime stone
Answer : C

40. The most valuable timber may be obtained from
A. Chir
B. Shishum
C. Sal
D. Teak
Answer : D

41. The commonly used thinner in oil paints, is
A. Naphtha
B. Turpentine
C. Both (a) and (b)
D. None the these
Answer : C

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

43. Seasoning of timber is done
A. To make it water proof
B. To paint its surface
C. To increase its temperature
D. To remove water
Answer : D

44. Sewer pipes are made of
A. Earthen ware
B. Stone ware
C. Refractory clay
D. All the above
Answer : B

45. The material generally not used as extender in paints, is
A. Powdered silica
B. Gypsum
C. Talc
D. Zinc white
Answer : D

46. A volatile substance added to a paint to make its application easy and smooth, is known as
A. Base
B. Solvent
C. Vehicle
D. None to these
Answer : B

47. Pick up the correct statement from the following:
A. Steel produced by open hearth process is milder than that obtained by the Bessemer process
B. Engineers prefer open hearth steel for structural purpose as it is more homogenous
C. Basic Bessemer process is suitable for converting poor ore containing a large proportion of sulphur and phosphorus into steel
D. All the above
Answer : D

48. Priming consists of
A. One part of white lead, 8 parts of chalk and four parts of twice boiled linseed oil
B. 8 parts of white lead, one part of chalk and four parts of twice boiled linseed oil
C. One part of white lead, 8 parts of chalk and one part of linseed oil
D. None to these
Answer : A

49. 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

50. Which of the following bricks are used for lining of furnaces?
A. Over-burnt bricks
B. Under-burnt bricks
C. Refractory bricks
D. First class bricks
Answer : C