1000+ Building Materials MCQ for DRDO [Solved]

1. The nominal size of the modular brick is
A. 190 mm × 90 mm × 80 mm
B. 190 mm × 190 mm × 90 mm
C. 200 mm × 100 mm × 100 mm
D. 200 mm × 200 mm × 100 mm
Answer : C

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

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

4. Pick up the correct statement from the following:
A. The plywoods do not split or crack due to changes in atmosphere
B. The commercial plywoods are available upto 150 cm wide and upto 300 cm long
C. The plywoods possess uniform tensile strength in all directions
D. All the above
Answer : D

5. 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

6. German silver is an alloy of
A. Zinc, lead and nickel
B. Silver, gold and lead
C. Copper, nickel and zinc
D. Copper, brass and zinc
Answer : C

7. 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

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

9. For preparing porcelains, the clay should be
A. Sufficiently pure
B. Of high degree of tenacity
C. Of good plasticity
D. All the above
Answer : D

10. To retard the initial setting time of cement, the compound responsible, is
A. Tri-calcium silicate
B. Gypsum
C. Di-calcium silicate
D. Tri-calcium aluminate
Answer : B

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

12. Formula for quick lime, is
A. CaCO₃
B. Ca(OH)₂
C. CO₃CO₂
D. None to these
Answer : A

13. 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

14. Dolomite is a lime stone which contains carbonate of magnesia upto
A. 15 %
B. 20 %
C. 25 %
D. 45 %
Answer : D

15. Stainless steel contains
A. 18% of chromium and 8% nickel
B. 8% of chromium and 18% of nickel
C. 12% of chromium and 36% of nickel
D. 36% of chromium and 12% of nickel
Answer : A

16. A pug mill is used for
A. Softening brick earth
B. Moulding brick earth
C. Tempering brick earth
D. Providing brick earth
Answer : C

17. Putty is
A. Made with finely powdered chalk and linseed oil
B. Used for fixing glass panes
C. Softened by a solution of pearl ash and quick-lime soaked in water
D. All the above
Answer : D

18. 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

19. 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

20. The frog of a brick is normally made on its
A. Top face
B. Bottom face
C. Longer face
D. Shorter side
Answer : A

21. With increase in moisture content, the bulking of sand
A. Increases
B. Decreases
C. First increases to a certain maximum value and then decreases
D. First decreases to a certain minimum value and then increases
Answer : C

22. Porcelain is used as:
A. Sanitary wares
B. Electric insulators
C. Storage vessels
D. Reactor chambers
Answer : D

23. Lime stones are generally known as
A. Aqueous rocks
B. Sedimentary rocks
C. Stratified rocks
D. All the above
Answer : D

24. Pick up the correct statement from the following:
A. In basic Bessemer process, the steel heats the converter
B. In open-hearth process, the furnace heats the steel
C. In Siemens process, the impurities of pig iron are oxidised by the oxygen of the ore
D. All the above
Answer : D

25. Plastics are compounds of carbon with element
A. Hydrogen
B. Nitrogen
C. Oxygen
D. All of these
Answer : D

26. 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

27. Most commonly used solvent in oil paints, is
A. Petroleum
B. Spirit
C. Coal tar
D. Turpentine
Answer : A

28. 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

29. Which of the following represents a metamorphic rock? (i) Slate (ii) Shale (iii) Quartzite The correct answer is
A. Only (iii)
B. Both (i) and (iii)
C. Both (ii) and (iii)
D. All (i), (ii) and (iii)
Answer : B

30. Name the type of cement from the following for canal linings:
A. Sulphate resisting cement
B. Rapid hardening cement
C. Quick setting cement
D. Pozzolana cement
Answer : A

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

32. Mastic asphalt is
A. Water proof
B. Fire proof
C. Elastic
D. All the above
Answer : D

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

34. A first class brick when immersed in cold water for 24 hours should not absorb water more than
A. 15 %
B. 20 %
C. 22 %
D. 25 %
Answer : B

35. Plastic asphalt is
A. Used as a water proofing layer over roof
B. A mixture of cement and asphalt
C. A natural asphalt
D. A refinery product
Answer : B

36. Dorry's testing machine is used for
A. Crushing test of stone
B. Hardness test of stone
C. Impact test of stone
D. Water absorption test
Answer : B

37. The slenderness ratio for masonry walls should not be more than
A. 10
B. 20
C. 30
D. 40
Answer : B

38. 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

39. Pick up the correct statement from the following:
A. Alexander Parkes, a Scottish chemist prepared a hard material by mixing camphor and alcohol with nitro cellulose and called it, as Parkesite
B. Dr. L. Bakeland, a Belgian scientist prepared a product known as Bakelite
C. Pollark, an Austrian scientist prepared a substance from urea and formaldehyde and called it Plastic
D. All the above
Answer : D

40. Good quality stones must
A. Be durable
B. Be free from clay
C. Resist action of acids
D. All the above
Answer : D

41. 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

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

43. 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

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

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

46. 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

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

48. For obtaining vinyl chloride acetate, the method used, is
A. Addition polymerization
B. Condensation polymerization
C. Co-polymerization
D. None of these
Answer : C

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

50. For construction of structures under water, the type of lime used, is
A. Hydraulic lime
B. Fat lime
C. Quick lime
D. Pure lime
Answer : A