96 + Interview Questions in Steel in Construction & Building Materials Page 2 InterviewSolution

51.	Which of the following statements about styrene is not true?(a) Styrene is light in weight(b) It has a low electrical resistance(c) Water absorption of styrene is low(d) Styrene is not easily attacked by chemicalsI have been asked this question by my college professor while I was bunking the class.I would like to ask this question from Plastics topic in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» RIGHT OPTION is (B) It has a low electrical resistance Explanation: Styrene is a THERMOPLASTIC resin which is not easily attacked by chemicals and which is light in weight. Water absorption of styrene is low and this resin has a very high electrical resistance.

Discussion

52.	Melamine is derived from ________(a) Silicon carbide(b) Calcium silicate(c) Calcium carbide(d) Calcium sulphateI got this question by my college director while I was bunking the class.My question is taken from Plastics topic in division Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The CORRECT answer is (C) CALCIUM carbide The explanation is: Melamine is derived from calcium carbide. It forms a thermosetting resin named melamine-formaldehyde on reaction with formaldehyde. Plastics OBTAINED from this resin are widely USED for electrical insulators.

Discussion

53.	Plastics are divided into thermoplastic and thermosetting on the basis of their ________(a) Behaviour with respect to heating(b) Structure(c) Physical properties(d) Mechanical propertiesThe question was asked in an international level competition.I need to ask this question from Plastics topic in division Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» CORRECT CHOICE is (a) Behaviour with respect to heating The best I can EXPLAIN: The classification of plastics is done on the basis of their behaviour with respect to heating, structure, physical properties and mechanical properties. Plastics are divided into THERMOPLASTIC and thermosetting on the basis of their behaviour with respect to heating.

Discussion

54.	Timber which is mostly used for engineering purposes belongs to endogenous trees.(a) True(b) FalseThe question was asked during an online interview.Question is from Timber topic in portion Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The correct choice is (b) False For explanation: Timber which is mostly used for engineering PURPOSES belongs to EXOGENOUS trees. These trees are further divided into two groups – deciduous and conifers. However, timber from ENDOGENOUS trees has very limited engineering applications.

Discussion

55.	When a part of the timber is affected by dry rot, the unaffected portion of the timber should be painted with a solution of _________(a) Aluminium nitrate(b) Silver chloride(c) Copper sulphate(d) Lead acetateThe question was posed to me in semester exam.This question is from Timber in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer»

Discussion

56.	Which of the following forms of steel is popularly known as rolled steel joist or beam?(a) I-section(b) Expanded metal(c) Corrugated sheet(d) Channel sectionThis question was posed to me during a job interview.The query is from Steel topic in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The correct ANSWER is (a) I-section The EXPLANATION: Steel is available in the market in various forms such as I-sections, expanded METAL, angle sections, CHANNEL sections, corrugated sheets, etc. I-sections are popularly known as ROLLED steel joists or beams.

Discussion

57.	Which of the following is not a variety of industrial timber?(a) Veneers(b) Plywood(c) Fibreboard(d) BaulkI had been asked this question in homework.The above asked question is from Timber topic in division Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The CORRECT choice is (d) Baulk The BEST I can explain: Timber that is scientifically prepared in a factory is called INDUSTRIAL timber. There are different varieties of industrial timber. These are veneers, PLYWOOD, fibreboard, impreg timbers and compreg timbers.

Discussion

58.	Red shortness is a defect occurring in steel due to the presence of an excess amount of ___________(a) Sulphur(b) Phosphorus(c) Sodium(d) CalciumI have been asked this question by my college director while I was bunking the class.This question is from Steel in portion Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Right CHOICE is (a) SULPHUR For explanation: Red shortness is a defect occurring in steel due to the PRESENCE of an excess AMOUNT of sulphur. Steel with this defect cracks when being worked in a hot state.

Discussion

59.	Tributyl phosphate is an example of ___________(a) Hardener(b) Pigment(c) Plasticizer(d) FillerThe question was posed to me in my homework.Question is taken from Plastics in section Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» CORRECT choice is (C) Plasticizer Easiest explanation: TRIBUTYL PHOSPHATE is an example of a plasticizer. Plasticizers are used to IMPROVE plasticity. They impart softness to plastics and they should be chemically inert.

Discussion

60.	The process of adding cement in order to improve the quality of lime mortar is known as __________(a) Gauging(b) Piling(c) Slaking(d) ReinforcingI got this question in quiz.This intriguing question originated from Mortar in section Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Correct option is (a) Gauging Easiest explanation: The PROCESS of adding cement in order to IMPROVE the quality of LIME mortar is known as gauging. It results in more economical, stronger and denser lime mortar. The proportion of cement to lime by volume is USUALLY about 1:6 to 1:8.

Discussion

61.	What is the colour of sea sand?(a) Blue(b) Light brown(c) Black(d) RedI have been asked this question in a national level competition.Question is taken from Mortar topic in division Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» RIGHT choice is (b) LIGHT brown Best explanation: Sand is BASICALLY of three TYPES – pit sand, river sand and sea sand. Sea sand is obtained from seashores and its colour is light brown.

Discussion

62.	Arsenide and sulphoarsenide are two important ores of _________(a) Aluminium(b) Cobalt(c) Steel(d) IronI have been asked this question in an online quiz.I'd like to ask this question from Non-Ferrous Metals and Alloys topic in division Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» RIGHT option is (b) Cobalt The explanation is: Arsenide and sulphoarsenide are TWO important ores of cobalt. The ores are purified and then fused with LIMESTONE in a blast FURNACE. Impure oxide of cobalt is produced.

Discussion

63.	Increase in volume of the sand due to the presence of moisture is called ___________ of sand.(a) Bulking(b) Normalising(c) Shrinkage(d) TitratingThe question was posed to me in a national level competition.The question is from Mortar topic in portion Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Right answer is (a) BULKING To explain: INCREASE in volume of the sand due to the presence of MOISTURE is CALLED bulking of sand. For a given moisture content, the finer the material, the more will be the RISE in volume.

Discussion

64.	Which of the following is not an ore of zinc?(a) Limonite(b) Zincite(c) Calamine(d) FrankliniteI got this question in examination.This interesting question is from Non-Ferrous Metals and Alloys topic in portion Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The correct choice is (a) Limonite The explanation is: The principle ores of ZINC are zincite, franklinite, zinc blende and calamine. Zinc is used in the process of GALVANIZATION. It is ALSO used in electric cells and in the PREPARATION of alloys.

Discussion

65.	Which of the following is not a property of cobalt?(a) Cobalt is a lustrous white metal(b) It is attacked by alkalies(c) Cobalt is malleable(d) Cobalt is ductileI have been asked this question in an online quiz.My question is based upon Non-Ferrous Metals and Alloys topic in division Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» RIGHT option is (b) It is attacked by alkalies The best explanation: Cobalt is a LUSTROUS white METAL which is not attacked by alkalies. Cobalt is DUCTILE and malleable. The specific GRAVITY of cobalt is 8.8.

Discussion

66.	The components of alkyd are _______(a) Alcohol and phthalic acid(b) Glycol and formic acid(c) Glycerine and phthalic acid(d) Glycerine and formic acidThe question was asked in homework.My doubt stems from Plastics topic in section Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The CORRECT answer is (c) Glycerine and phthalic acid The EXPLANATION: Alkyd is a THERMOPLASTIC resin that is used to PREPARE thin films of PLASTICS. The components of alkyd are glycerine and phthalic acid.

Discussion

67.	Which of the following types of plastics have a high modulus of elasticity?(a) Rigid plastics(b) Semi-rigid plastics(c) Soft plastics(d) ElastomersI have been asked this question by my school teacher while I was bunking the class.Question is from Plastics topic in section Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» CORRECT option is (a) Rigid plastics To elaborate: Rigid plastics have a HIGH MODULUS of elasticity. Semi-rigid plastics have a medium modulus of elasticity. Soft plastics and ELASTOMERS have a low modulus of elasticity.

Discussion

68.	Fire-resistant mortar is obtained by the addition of ____________ to the powder of fire-bricks.(a) Silica(b) Sodium silicate(c) Aluminous cement(d) Caustic sodaThe question was posed to me in semester exam.This intriguing question originated from Mortar topic in portion Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The correct option is (c) ALUMINOUS cement Best explanation: FIRE-RESISTANT mortar is obtained by the addition of aluminous cement to the powder of fire-bricks. Because this mortar is fire resistant, it is used with fire bricks for lining furnaces, ovens, etc.

Discussion

69.	Which of the following is not a property of the packing mortar used to pack oil wells?(a) It should be water-resistant(b) It should have low homogeneity(c) It should have resistance to subsoil water pressure(d) It should be able to form solid waterproof plugs in voids of rocksThis question was posed to me in quiz.I'm obligated to ask this question of Mortar in section Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The CORRECT option is (B) It should have low homogeneity To explain: Packing mortar which is used to PACK oil wells should be water-resistant and should ALSO have resistance to subsoil water pressure. It should have high homogeneity and it should be able to form solid waterproof plugs in VOIDS of rocks.

Discussion

70.	Y-alloy is an important alloy of ___________(a) Manganese(b) Iron(c) Aluminium(d) GoldI had been asked this question by my school principal while I was bunking the class.I'd like to ask this question from Non-Ferrous Metals and Alloys in division Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The CORRECT option is (c) Aluminium For explanation: Y-alloy is an important alloy of aluminium. Other important alloys of aluminium are duralumin, aldural and aluminium BRONZE. Y-alloy consists of aluminium, copper, nickel and magnesium and is a GOOD conductor of HEAT.

Discussion

71.	Dry rot is a defect caused in timber in which wood is converted into dry powder form by fungi. Which of the following statements about dry rot is not correct?(a) Unseasoned softwoods cannot be easily attacked by dry rot(b) It usually occurs at places where there is no free circulation of air(c) If the storage of timber after its felling is not done properly, it is liable for the attack of dry rot(d) It is not essential to have damp conditions for the development of dry rotI got this question at a job interview.This key question is from Timber in portion Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Right answer is (a) Unseasoned softwoods cannot be EASILY attacked by dry rot Easy explanation: Dry rot is a defect CAUSED in timber in which wood is converted into dry powder form by FUNGI. It usually occurs at those PLACES where the free circulation of air is absent. It is found that unseasoned softwoods are easily attacked by dry rot.

Discussion

72.	What kind of steel is obtained from L.D. process?(a) Highly pure low carbon steel(b) Impure low carbon steel(c) Highly pure high carbon steel(d) Impure low carbon steelI got this question by my school principal while I was bunking the class.My query is from Steel topic in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Right option is (a) Highly pure low carbon steel Explanation: Highly pure low carbon steel is obtained from L.D. PROCESS. This process was first invented in Austria. It was adopted in two towns NAMED LINZ and Donawitz, hence the NAME L.D. process or Linz-Donawitz process.

Discussion

73.	What is the colour of river sand?(a) Black(b) Brown(c) Grey(d) WhiteI had been asked this question at a job interview.This interesting question is from Mortar in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Right answer is (d) White The explanation is: River sand is obtained from BANKS of RIVERS. It CONSISTS of fine ROUNDED grains and its colour is almost white. The use of river sand enhances the WORKABILITY of the mortar.

Discussion

74.	The percentage composition of copper and tin in speculum metal is _________(a) 33% and 67%(b) 67% and 33%(c) 26% and 74%(d) 74% and 26%The question was asked by my school teacher while I was bunking the class.This is a very interesting question from Non-Ferrous Metals and Alloys topic in portion Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Right ANSWER is (b) 67% and 33% For explanation I would SAY: The percentage composition of copper and tin in speculum metal is 67% and 33% respectively. Speculum metal is SILVERY in colour and is USED in making TELESCOPES.

Discussion

75.	The composition of phosphor bronze is _________(a) 1% phosphorus, 10% tin and 89% copper(b) 89% phosphorus, 10% tin and 1% copper(c) 1% phosphorus, 89% tin and 10% copper(d) 10% phosphorus, 1% tin and 89% copperThis question was addressed to me by my school teacher while I was bunking the class.My query is from Non-Ferrous Metals and Alloys topic in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Correct option is (c) 1% phosphorus, 89% TIN and 10% copper Easiest explanation: The composition of phosphor bronze is 1% phosphorus, 89% tin and 10% copper. Phosphor bronze is HARD and strong and resists corrosion by sea water.

Discussion

76.	To detect the presence of organic impurities in sand, solution of ___________ is used.(a) Silver chloride(b) Sodium acetate(c) Sodium hydroxide(d) Calcium carbonateThe question was asked during an online interview.My question comes from Mortar topic in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» RIGHT choice is (c) Sodium hydroxide To explain: To detect the PRESENCE of organic IMPURITIES in sand, the solution of sodium hydroxide is used. If the COLOUR of the solution changes to brown, it INDICATES the presence of organic matter in the sand.

Discussion

77.	Which of the following resins is also known as acrylic?(a) Methyl methacrylate(b) Alkyd(c) Styrene(d) VinylThe question was posed to me in homework.The above asked question is from Plastics in section Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» RIGHT choice is (a) Methyl methacrylate The explanation is: Methyl methacrylate is a thermoplastic resin which is ALSO KNOWN as acrylic. This resin is derived from COAL PETROLEUM and water. Plastics obtained from this resin are used for roof lights, safety glass, etc.

Discussion

78.	_________ is adopted to prepare small quantities of lime mortar.(a) Grinding(b) Grilling(c) Pounding(d) DiggingThis question was addressed to me by my school principal while I was bunking the class.This intriguing question originated from Mortar in portion Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Right option is (c) POUNDING The best explanation: There are two methods to prepare LIME mortar – pounding and GRINDING. Pounding is adopted to prepare small QUANTITIES of lime mortar while grinding is adopted to prepare large quantities of lime mortar. Pounding is not an EFFICIENT method to prepare lime mortar.

Discussion

79.	It is known as dead steel when the percentage of carbon content is less than __________(a) 0.10(b) 0.20(c) 0.25(d) 0.30I got this question in a national level competition.Question is from Steel in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Right choice is (a) 0.10 To explain I would say: STEEL is designated as mild steel, medium carbon steel and high carbon steel depending on the PERCENTAGE of carbon content. It is designated as dead steel or very LOW carbon steel when the percentage of carbon content is LESS than 0.10.

Discussion

80.	Batten is a piece of timber whose thickness and breadth do not exceed ________(a) 10 mm(b) 30 mm(c) 50 mm(d) 100 mmThe question was asked during an interview.The question is from Timber topic in division Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Right choice is (c) 50 mm To explain: Timber is available in MARKETS in VARIOUS forms. These are BATTENS, boards, ends, POLES, etc. Batten is a piece of timber WHOSE thickness and breadth do not exceed 50 mm.

Discussion

81.	The correct order of oxidation of different impurities of pig-iron in the Bessemer process is __________(a) Silicon, carbon, manganese, sulphur, phosphorus(b) Silicon, phosphorus, sulphur, manganese, carbon(c) Carbon, phosphorus, sulphur, manganese, silicon(d) Carbon, phosphorus, silicon, manganese, sulphurI have been asked this question in my homework.This intriguing question originated from Steel topic in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Right answer is (a) Silicon, CARBON, manganese, sulphur, phosphorus The best I can EXPLAIN: Bessemer PROCESS, used for the manufacturing of steel is adopted for pig IRON containing IMPURITIES of any kind. The correct order of oxidation of different impurities of pig-iron in this process is Silicon, carbon, manganese, sulphur and phosphorus.

Discussion

82.	Nickel silver is also known as _________(a) Spanish Silver(b) German Silver(c) Indian Silver(d) Asian silverThis question was posed to me in an interview for job.Question is taken from Non-Ferrous Metals and Alloys in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The correct option is (b) GERMAN Silver Explanation: Nickel silver is an ALLOY of nickel which is also known as German Silver. It is basically a brass in which nickel is added. THEREFORE, it consists of COPPER, ZINC and nickel.

Discussion

83.	The percentage of copper and zinc in cartridge brass is _______ and __________ respectively.(a) 30%,70%(b) 70%, 30%(c) 40%, 60%(d) 60%, 40%I had been asked this question during an online exam.This interesting question is from Non-Ferrous Metals and Alloys in section Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The CORRECT OPTION is (b) 70%, 30% To EXPLAIN: The percentage of copper and zinc in cartridge BRASS is 70% and 30% respectively. It is a common variety of brass which is USED for cartridges, springs etc.

Discussion

84.	Hexamethylene tetramine serves as a hardener for ________(a) Cellulose(b) Polystyrene(c) Polyvinylchloride(d) Phenol formaldehydeThis question was addressed to me at a job interview.I'm obligated to ask this question of Plastics in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» CORRECT answer is (d) PHENOL formaldehyde The best explanation: HEXAMETHYLENE tetramine serves as a hardener for phenol-formaldehyde. A hardener is a compound that is used to increase the HARDNESS of resins.

Discussion

85.	Which type of mortar should be used for damp proof courses and cement concrete roads?(a) Lime mortar (1:2)(b) Lime mortar (1:3)(c) Cement mortar (1:2)(d) Lime cinder mortar (1:4)I have been asked this question during an interview.I'm obligated to ask this question of Mortar topic in portion Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Right choice is (c) Cement mortar (1:2) For EXPLANATION I would SAY: For damp proof COURSES and cement concrete ROADS, cement mortar in the RATIO 1:2 should be used. However, for reinforced brickwork, cement mortar of ratio 1:3 is used.

Discussion

86.	Which of the following is not a property of copper?(a) Copper is a good conductor of heat(b) The melting point of copper is 1083°C(c) Copper becomes brittle above its melting point(d) The specific gravity of copper is 8.9I got this question in examination.Question is from Non-Ferrous Metals and Alloys in section Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Correct choice is (c) Copper becomes BRITTLE above its MELTING point The best I can explain: Copper is a GOOD CONDUCTOR of heat. The melting point of copper is 1083°C and it becomes brittle just below its melting point. The specific gravity of copper is 8.9.

Discussion

87.	The percentage composition of copper and zinc in yellow brass is ___________(a) 35% and 65%(b) 65% and 35%(c) 20% and 80%(d) 80% and 20%I have been asked this question in an internship interview.Enquiry is from Non-Ferrous Metals and Alloys topic in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Right choice is (B) 65% and 35% The best I can EXPLAIN: The PERCENTAGE composition of copper and zinc in yellow brass is 65% and 35% respectively. The SPECIFIC gravity of yellow brass is 8.47 and it is used for lamp fixtures, plumbing, etc.

Discussion

88.	When 1% of tin is added to cartridge metal, it is known as ________(a) Naval brass(b) Muntz metal(c) Red brass(d) Admiralty metalThis question was addressed to me during an interview.My enquiry is from Non-Ferrous Metals and Alloys topic in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The correct option is (d) Admiralty METAL Best explanation: When 1% of tin is added to cartridge metal, it is known as admiralty metal. However, if it is added to Muntz metal, it is known as NAVAL BRASS which is an EXCEPTION to the general rule of brass which says that any element MAY be present in brass except tin.

Discussion

89.	Percentage of carbon content in steel varies from _________(a) 0.25-1.50(b) 2.00-4.00(c) 3.00-4.50(d) 2.50-3.50The question was posed to me in final exam.Origin of the question is Steel topic in portion Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» CORRECT choice is (a) 0.25-1.50 To explain I would say: Percentage of CARBON content in steel varies from 0.25-1.50. Steel forms an intermediate STAGE between wrought IRON and cast iron. Cast iron has carbon from 2-4 PERCENT while in wrought iron the percentage of carbon content does not exceed 0.15.

Discussion

90.	Cold shortness is a defect occurring in steel due to the presence of an excess amount of ___________(a) Potassium(b) Phosphorus(c) Sodium(d) MagnesiumI got this question in quiz.Asked question is from Steel topic in section Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The CORRECT choice is (B) Phosphorus Explanation: Cold shortness is a defect occurring in steel due to the PRESENCE of an excess amount of phosphorus. Steel with this defect CRACKS when being WORKED in a cold state.

Discussion

91.	Aluminium is commercially produced usually from ________(a) Hematite(b) Pyrite(c) Malachite(d) BauxiteThis question was addressed to me by my school principal while I was bunking the class.This interesting question is from Non-Ferrous Metals and Alloys in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The CORRECT choice is (d) Bauxite Explanation: Aluminium is available in various forms such as SULPHATES, oxides, PHOSPHATES, etc. Aluminium is commercially PRODUCED USUALLY from bauxite. Bauxite is a hydrated oxide of aluminium.

Discussion

92.	X-ray shielding mortar is a lightweight mortar having a bulk density of less than 1500 kg/m^3.(a) True(b) FalseI got this question by my college director while I was bunking the class.Query is from Mortar in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Correct ANSWER is (B) False For explanation: X-ray SHIELDING MORTAR is a heavy mortar. The BULK density of this mortar is more than 2200 kg/m^3.

Discussion

93.	Steel can only take up compressive stresses while cast iron is equally strong in compression and tension.(a) True(b) FalseI have been asked this question in examination.My enquiry is from Steel in division Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» CORRECT option is (b) False Explanation: Cast iron can only take up COMPRESSIVE stresses while STEEL is EQUALLY strong in compression and tension. Due to this, steel has practically replaced cast iron in the practice of building construction these DAYS.

Discussion

94.	Which of the following processes is also known as the Siemens-Martin process?(a) Open-hearth process(b) L.D. process(c) Electric process(d) Duplex processThe question was asked during an interview.My doubt is from Steel topic in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The correct choice is (a) Open-hearth process Easy explanation: Open-hearth process is ALSO known as the Siemens-Martin process. This is because Seimens INVENTED this process first and then Martin MADE some improvements in it. This process is USED to manufacture steel.

Discussion

95.	The electric furnace used in the electric process to manufacture steel is lined with _________ material.(a) Basic refractory(b) Basic non-refractory(c) Acidic refractory(d) Acidic non-refractoryThe question was posed to me during an interview for a job.My enquiry is from Steel topic in portion Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» Correct choice is (a) Basic refractory Best explanation: The electric furnace used in the electric process to MANUFACTURE steel is LINED with basic refractory MATERIAL. It is either rectangular or circular in SHAPE and is made of steel PLATES. In the electric process, electricity is used to heat and melt the metal.

Discussion

96.	Duplex process, used to manufacture steel, is a combination of which of the following two processes?(a) Basic Bessemer process and basic open-hearth process(b) Acid Bessemer process and acid open-hearth process(c) Acid Bessemer process and basic open-hearth process(d) Basic Bessemer process and acid open-hearth processI have been asked this question in an online quiz.My doubt is from Steel topic in division Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» The correct OPTION is (c) Acid Bessemer PROCESS and basic open-hearth process The best explanation: Duplex process, USED to manufacture STEEL, is a COMBINATION of acid Bessemer process and basic open-hearth process. This process is highly economical and has advantages of both Bessemer and open-hearth processes.

Discussion

Explore topic-wise InterviewSolutions in .

Timber which is mostly used for engineering purposes belongs to endogenous trees.(a) True(b) FalseThe question was asked during an online interview.Question is from Timber topic in portion Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials

Tributyl phosphate is an example of ___________(a) Hardener(b) Pigment(c) Plasticizer(d) FillerThe question was posed to me in my homework.Question is taken from Plastics in section Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials

What is the colour of sea sand?(a) Blue(b) Light brown(c) Black(d) RedI have been asked this question in a national level competition.Question is taken from Mortar topic in division Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials

What is the colour of river sand?(a) Black(b) Brown(c) Grey(d) WhiteI had been asked this question at a job interview.This interesting question is from Mortar in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials