Building Materials MCQ Solved Paper for NMAT

1. 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

2. Pick up the correct statement from the following:
A. The free quartz suddenly expands at a temperature lower than 600°C
B. The lime stone resists fire upto about 800°C and at higher temperature it splits into CaO and CO2
C. The sand stone with silicates resist a fire in a better way
D. All the above
Answer : D

3. The stones obtained by blasting are used as
A. Ballast in railways
B. Aggregates for concrete
C. Road metal
D. All the above
Answer : D

4. 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

5. 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

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

7. The weight of a good quality brick when immersed in water for a period of 16 hours should not exceed the weight of dry brick
A. 20 %
B. 15 %
C. 10 %
D. None of these
Answer : A

8. The minimum percentage of silica, alumina and ferric oxide in lime for white washing, is
A. 20
B. 15
C. 5
D. 0
Answer : D

9. A good quality stone absorbs water less than
A. 5 %
B. 10 %
C. 15 %
D. 25 %
Answer : A

10. Lime stone is not a
A. Sedimentary rock
B. Stratified rock
C. Aqueous rock
D. Metamorphic rock
Answer : D

11. Good quality sand is never obtained from
A. River
B. Lake
C. Sea
D. Gravel powder
Answer : C

12. Asbestos
A. Is a natural fibrous mineral substance
B. Is composed of hydrous silicates of calcium and magnesium (CaSiO₃, 3MgSiO₃)
C. Contains iron oxide and alumina
D. All the above
Answer : D

13. Pick up the volcanic rock from the following:
A. Granite
B. Dolerite
C. Basalt
D. All the above
Answer : C

14. Bitumen felt is used for
A. Water proofing
B. Damp proofing
C. Both (A) and (B)
D. Neither (A) nor (B)
Answer : C

15. The presence of original rounded surface on the manufactured piece of timber, is called
A. Wane
B. Torn grain
C. Diagonal grain
D. Chipmark
Answer : A

16. A stone is rejected if it absorbs water more than
A. 5 %
B. 10 %
C. 15 %
D. 20 %
Answer : B

17. The most commonly used synthetic abrasive is
A. Aluminium carbide
B. Boric acid
C. Silicon
D. All of these
Answer : D

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

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

20. Rapid hardening cement contains
A. Tri-calcium silicate
B. Tri-calcium aluminate
C. Tetra-calcium alumino-ferrite
D. Di-calcium silicate
Answer : A

21. 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

22. 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

23. The main ingredients of Portland cement are
A. Lime and silica
B. Lime and alumina
C. Silica and alumina
D. Lime and iron
Answer : A

24. The yield strength and tensile strength of low carbon steel may be improved by the addition of
A. Manganese
B. Chromium
C. Nickel
D. Vanadium
Answer : D

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

26. Jumper is a tool used for
A. Testing of stones
B. Quarrying of stones
C. Dressing of stones
D. None of the above
Answer : B

27. Pick up the correct statement from the following:
A. Roasting is not necessary if iron ore is an oxide
B. Impurities float on the molten iron as slag
C. The slag contains lime about 45%
D. All the above
Answer : D

28. 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

29. Pick up the correct statement from the following:
A. Quick lime is obtained by burning pure lime stone
B. Hydraulic lime is obtained by burning lime stone containing clay 5% to 30%
C. Poor lime is obtained by burning lime stone containing impurities more than 5%
D. All the above
Answer : D

30. Pick up the correct statement from the following:
A. The theory of formation of concrete is based on the phenomena of formation of voids
B. The bulking of sand is taken into account while volumetric proportioning of the aggregates
C. The dry sand and the sand completely flooded with water, have practically the same volume
D. All the above
Answer : D

31. 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

32. 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

33. Pick up the hypabyssal rock from the following:
A. Granite
B. Dolerite
C. Basalt
D. All the above
Answer : B

34. The main constituent of cement which is responsible for initial setting of cement is
A. Di-calcium silicate
B. Tri-calcium silicate
C. Tri-calcium aluminate
D. All of the above
Answer : C

35. Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth?
A. Lime stone and alumina
B. Silica and alkalies
C. Alumina and iron
D. Alkalies and magnesium
Answer : B

36. The pressure acting on the stones in stone masonry construction should be
A. Along the direction of bedding planes
B. At 45° to the direction of bedding planes
C. At 60° to the direction of bedding planes
D. Perpendicular to the direction of bedding planes
Answer : D

37. 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

38. The most durable varnish is
A. Water varnish
B. Spirit varnish
C. Turpentine varnish
D. Oil varnish
Answer : D

39. For melting one tonne of cast iron
A. 700 m3 air is required
B. 20 kg limestone is required
C. One quintal coke is required
D. All the above
Answer : D

40. The constituent of cement which is responsible for all the undesirable properties of cement is
A. Di-calcium silicate
B. Tri-calcium silicate
C. Tri-calcium aluminate
D. Tetra calcium alumino ferrite
Answer : C

41. For lime concrete,
A. Slump is 50 to 75 mm
B. Flexural strength at 90 days is 0.2 N/mm²
C. Compressive strength at 90 days is 1.5 N/mm²
D. All the above
Answer : D

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

43. The cracks which extend from bark towards the sap wood in the cross section of a tree, are called
A. Radial shakes
B. Star shakes
C. Heart shakes
D. Cup shakes
Answer : B

44. Crushing strength of a first class brick should not be less than
A. 3.5 N/mm²
B. 7.0 N/mm²
C. 10.5 N/mm²
D. 14.0 N/mm²
Answer : C

45. 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

46. Addition of pozzolana to ordinary Portland cement increases
A. Bleeding
B. Shrinkage
C. Permeability
D. Heat of hydration
Answer : B

47. Pick up the constituent of good brick earth whose excess causes the raw bricks shrink and warp during drying and burning, from the following:
A. Alumina
B. Lime
C. Iron-oxide
D. Magnesia
Answer : A

48. 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

49. 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

50. 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