Building Materials 1000+ MCQ with answer for ISRO Recruitment

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

2. 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

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

4. For filling cracks in masonry structures, the type of bitumen used, is
A. Cut-back bitumen
B. Bitumen-emulsion
C. Blown bitumen
D. Plastic bitumen
Answer : D

5. 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

6. Pick up the correct statement from the following:
A. Air bubbles in casting produce a dull sound by tapping their surfaces lightly with a hammer
B. Cupola furnace is used for the manufacture of cast iron
C. Red short iron is of no value for welding purpose
D. All the above
Answer : D

7. Index number expressing the relative sizes of both coarse and fine aggregates, is called
A. Proportioning of aggregates
B. Fineness modulus
C. Grading of aggregates
D. None of these
Answer : B

8. Plastic
A. Is an organic substance
B. Consists of natural or synthetic binders
C. Finished products are rigid and stable at normal temperature
D. All the above
Answer : D

9. The size of modular bricks, is
A. 10 × 10 × 9 cm
B. 19 × 9 × 9 cm
C. 22.5 × 10 × 8.5 cm
D. 22.5 × 8.0 × 9 cm
Answer : B

10. The most commonly used retarder in cement is
A. Gypsum
B. Calcium chloride
C. Calcium carbonate
D. None of the above
Answer : A

11. Seasoning is
A. A process of removing sap
B. Creosoting
C. Painting with sodium silicate
D. Coating with tar
Answer : A

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

13. Pick up the correct characteristic of Pyroxene from the following:
A. It forms octagonal crystals
B. It converts to chlorine by hydration
C. Its density is 2.3 to 3.6 g/cm²
D. All the above
Answer : D

14. For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of
A. 1 : 2
B. 1 : 3
C. 1 : 4
D. 1 : 6
Answer : B

15. Which of the following cements is suitable for use in massive concrete structures such as large dams?
A. Ordinary Portland cement
B. Low heat cement
C. Rapid hardening cement
D. Sulphate resisting cement
Answer : B

16. The timber having maximum resistance against white ants, is obtained from
A. Chir
B. Shishum
C. Sal
D. Teak
Answer : B

17. Blister steel
A. Is obtained by cementation process
B. Is full of fissures and cavities
C. Can be easily welded
D. All the above
Answer : D

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

19. 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

20. 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

21. 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

22. 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

23. Spirit varnish generally consists of
A. Oil, wax and resin
B. Alcohol, wax and turpentine
C. Pigment and synthetic resin
D. Spirit and shellac
Answer : D

24. Bituminous fells are used for
A. Covering A.C. sheets
B. Covering sloping roofs
C. D.P.C.
D. None to these
Answer : A

25. Refractory bricks resist
A. High temperature
B. Chemical action
C. Dampness
D. All the above
Answer : A

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

27. Jhumb bricks are
A. Under burnt
B. Over burnt
C. Kutcha
D. None of these
Answer : B

28. Pick up the correct statement from the following:
A. The distinct plane of division along which a stone can easily be split, is called natural bed of stone
B. The natural bed of sedimentary rocks is along the planes of stratification
C. The natural bed of igneous rocks is not defined
D. All the above
Answer : D

29. Pick up the correct statement from the following:
A. Rust is due to formation of oxides
B. Cast iron oxidises less
C. Steel oxidises most
D. All the above
Answer : D

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

31. The operation of removal of impurities or clay adhering to iron ores, is known as
A. Dressing
B. Calcination
C. Roasting
D. Smelting
Answer : A

32. Mastic asphalt is normally used for
A. Sound insulation
B. Water proofing
C. Fire proofing
D. None to these
Answer : B

33. The preparation of surface of stone to obtain plain edges or to obtain stones of required size and shape is known as
A. Quarrying of stones
B. Blasting of stones
C. Seasoning of stones
D. Dressing of stones
Answer : D

34. 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

35. Ground glass
A. Is made by grinding its one side
B. Is made by melting powdered glass paints surface
C. Is used for getting light without transparency
D. All the above
Answer : D

36. 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

37. 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

38. Pick up the compound responsible for early strength of cement from the following:
A. Tetra-calcium alumino-ferrite
B. Tri-calcium silicate
C. Tri-calcium aluminate
D. Di-calcium silicate
Answer : B

39. Geologically, marble is known as
A. Sedimentary rock
B. Igneous rock
C. Metamorphic rock
D. Stratified rock
Answer : C

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

41. 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

42. 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

43. 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

44. The size of mould for bricks, is generally kept
A. A little large to specified size
B. A little small to specified size
C. Equal to specified size
D. 10% larger than specified size
Answer : A

45. 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

46. 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

47. Which one of the following is an air binding material?
A. Gypsum
B. Acid-resistant cement
C. Quick lime
D. All of these
Answer : D

48. Lime concrete is generally used for
A. Wall foundations
B. Flooring at ground level
C. Both (A) and (B)
D. Neither (A) nor (B)
Answer : B

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

50. 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