SSC Scientific Assistant - Building Materials 1000+ MCQ [Solved] PDF Download

1. Snowcrete is one of the patent forms of
A. Distempers
B. Water proof cement paints
C. Enamel paints
D. Cellulose paints
Answer : B

2. The proportions of lime and sand in the mortar normally used in brick construction are
A. 1 : 2
B. 1 : 4
C. 1 : 6
D. 1 : 8
Answer : A

3. 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

4. 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

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

6. 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

7. Which of the following metamorphic rocks has the most weather resisting characteristics?
A. Marble
B. Quartzite
C. Slate
D. Lime stone
Answer : B

8. 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

9. 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

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

11. 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

12. 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

13. Brittleness of cold is due to an excess of
A. Sulphur
B. Carbon
C. Phosphorus
D. Silicon
Answer : C

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

15. Pick up the correct statement from the following:
A. The phenol is carbolic acid
B. The phenol is either extracted from coal-tar or prepared from benzene
C. Phenol reacts with formaldehyde, to form phenol formaldehyde resin
D. All the above
Answer : D

16. 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

17. Portland pozzolana cement possesses
A. Higher resistance to chemical attack
B. Lower heat of hydration
C. Lower shrinkage on drying
D. All the above
Answer : D

18. For slaking of 10 kg of CaO, the theoretical amount of water is
A. 2.2 kg
B. 1.5 kg
C. 3.2 kg
D. None of these
Answer : C

19. Smith's test of stones is performed to find out
A. The presence of soluble matter of stone
B. The compressive strength of the stone
C. The hardness of the stone
D. The toughness of the stone
Answer : A

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

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

22. The portion of a brick cut to form angles other than right angles in plan, is known as
A. Queen closer
B. King closer
C. Closer
D. Squint brick
Answer : D

23. 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

24. 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

25. Cast iron
A. Is obtained by purifying pig iron
B. Is manufactured in required shapes
C. May contain 2 to 5 per cent of carbon with other impurities
D. All the above
Answer : D

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

27. 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

28. The fire clay contains pure
A. Lime
B. Oxide of iron
C. Hydrated aluminium silicate
D. Magnesium
Answer : C

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

30. 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

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

32. 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

33. Polymerization helps to improve the property of
A. Strength
B. Rigidity
C. Elasticity
D. All of these
Answer : D

34. 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

35. Wrought iron is used for
A. Structural works in beams
B. Small sized water pipes
C. Columns and struts
D. None to these
Answer : B

36. Number of bricks required for one cubic metre of brick masonry is
A. 400
B. 450
C. 500
D. 550
Answer : C

37. 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

38. A prime coat is given to steel work with
A. An oxide of iron paint
B. A mixture of white lead and lead paint
C. A special paint
D. Cement paint
Answer : B

39. The percentage of alumina and silica in good fire clay vary respectively is
A. 25, 75
B. 30, 70
C. 35, 65
D. All of these
Answer : A

40. Which one of the following polymers is obtained from condensation polymerization?
A. Phenol formaldehyde
B. Carbamide
C. Melamine-formaldehyde
D. All of these
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. As per IS specifications, the maximum final setting time for ordinary Portland cement should be
A. 30 minutes
B. 1 hour
C. 6 hours
D. 10 hours
Answer : D

43. The portion of the brick without a triangular corner equal to half the width and half the length, is called
A. Closer
B. Queen closer
C. King closer
D. Squint brick
Answer : C

44. Clay and silt content in a good brick earth must be at least
A. 50 %
B. 40 %
C. 30 %
D. 25 %
Answer : A

45. 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

46. Age of a tree may be ascertained by
A. Radius of its stem
B. Circumference of its stem
C. Number of branches
D. Number of annual rings
Answer : D

47. 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

48. Excess of silica in brick earth results in
A. Cracking and warping of bricks
B. Loss of cohesion
C. Enhancing the impermeability of bricks
D. None of the above
Answer : B

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

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