54 + Interview Questions in Miscellaneous Materials in Construction & Building Materials Page 1 InterviewSolution

1.	Expanding cement is obtained by the addition of an expanding medium like _________ to the ordinary cement.(a) Sodium silicate(b) Potassium silicate(c) Sodium aluminate(d) Sulpho-aluminateThis question was addressed to me during an online exam.I'd like to ask this question from Plain and Reinforced in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» RIGHT option is (d) Sulpho-aluminate To elaborate: EXPANDING cement is obtained by the ADDITION of an expanding medium like sulpho-aluminate to the ordinary cement. Therefore, the expanding cement expands while all other cements SHRINK. It is used to repair the damaged concrete surfaces.

Discussion

2.	Tensile strength of rubber belts is about _______(a) 100 kg/cm^2(b) 300 kg/cm^2(c) 400 kg/cm^2(d) 1000 kg/cm^2I got this question during an online interview.Query is from Miscellaneous Materials in section Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct choice is (C) 400 kg/cm^2 Explanation: TENSILE STRENGTH of rubber belts is about 400 kg/cm^2. Rubber belts are reinforced with jute, cotton, canvas etc. Rubber belts are QUITE cheap and have a better grip on pulleys.

Discussion

3.	Clay predominates in calcareous materials while calcium carbonate predominates in argillaceous materials.(a) True(b) FalseI have been asked this question in examination.My query is from Plain and Reinforced topic in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Correct ANSWER is (B) False Explanation: The two basic ingredients of ORDINARY cement are argillaceous and calcareous. Calcium carbonate predominates in calcareous materials while CLAY predominates in argillaceous materials.

Discussion

4.	Nitrocellulose glues are prepared from _________(a) Natural gum(b) Starch(c) Rubber(d) PyroxilinThis question was posed to me in quiz.The origin of the question is Miscellaneous Materials topic in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Right choice is (d) Pyroxilin Explanation: Nitrocellulose glues are PREPARED from pyroxilin. pyroxilin is NITRATED cellulose which is DERIVED by the TREATMENT of cellulose with nitric acid.

Discussion

5.	The thermo-plastic glues are permanent once they are set.(a) True(b) FalseThis question was addressed to me in an interview for job.Asked question is from Miscellaneous Materials in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Right choice is (B) False To elaborate: Glues from SYNTHETIC resins can be EITHER thermo-plastic glues or thermo-setting glues. The thermo-plastic glues, on reheating, can be made plastic again while the thermo-setting glues are PERMANENT once they are SET.

Discussion

6.	High-alit contains tricalcium silicate more than ________(a) 10%(b) 13%(c) 30%(d) 60%I had been asked this question during an online interview.The doubt is from Plain and Reinforced in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» RIGHT choice is (d) 60% To ELABORATE: High-alit CONTAINS TRICALCIUM silicate more than 60%. HOWEVER, alit contains tricalcium silicate more than 50-60%.

Discussion

7.	Which of the following statements about liquid lubricants is false?(a) They should be greasy in nature(b) Their melting point should be high(c) Their boiling point should be high(d) They should not contain any impuritiesI got this question in an online interview.I need to ask this question from Miscellaneous Materials topic in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Right answer is (b) Their melting point should be high The BEST I can explain: Liquid LUBRICANTS should be GREASY in NATURE and should not contain any impurities. Their boiling point should be high and melting point should be LOW.

Discussion

8.	Which of the following is not a synthetic resin?(a) Melamine resins(b) Urea resins(c) Animal protein glue(d) Phenolic resinsThe question was asked at a job interview.The question is from Miscellaneous Materials topic in section Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer»

Discussion

9.	Which of the following statements about gypsum is not correct?(a) The final setting time of gypsum is 30 minutes(b) The solubility of gypsum in water is very poor(c) Gypsum in insoluble in sulphuric acid(d) Gypsum is insoluble in hydrochloric acidThe question was asked in an internship interview.I need to ask this question from Miscellaneous Materials topic in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct CHOICE is (d) GYPSUM is insoluble in hydrochloric acid The best I can explain: The final SETTING time of gypsum is 30 minutes. The solubility of gypsum in water is very poor. Gypsum in insoluble in sulphuric acid but soluble in hydrochloric acid.

Discussion

10.	The final setting time of high alumina cement is about _______(a) 30 mins(b) 2 hours(c) 5 hours(d) 24 hoursThis question was addressed to me in my homework.This question is from Plain and Reinforced in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» RIGHT choice is (c) 5 hours For explanation I would say: The final setting TIME of high alumina cement is about 5 hours. The setting ACTION of this cement mainly depends on the chemical reactions and therefore it is not essential to grind it to a FINE powder. Great amount of heat is evolved during setting.

Discussion

11.	Coal gas is obtained by thermal decomposition of coal in the presence of air at low temperature.(a) True(b) FalseI had been asked this question during a job interview.I'd like to ask this question from Miscellaneous Materials topic in section Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct option is (b) False The BEST explanation: Coal GAS, natural gas and producer gas are some IMPORTANT GASEOUS fuels. Coal gas is obtained by THERMAL decomposition of coal in the absence of air at high temperatures.

Discussion

12.	Which of the following compounds is not formed during the setting action of the cement?(a) Tricalcium aluminate(b) Tricalcium silicate(c) Dicalcium silicate(d) Dimagnesium carbonateI have been asked this question in an interview for job.I would like to ask this question from Plain and Reinforced in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Right answer is (d) Dimagnesium carbonate To explain: Important compounds that are formed during the SETTING ACTION of the CEMENT are tricalcium aluminate, tricalcium silicate, DICALCIUM silicate and tetra-calcium alumino-ferrite. The setting action of the cement persists for a long TIME.

Discussion

13.	Which of the following is also known as residual asphalt?(a) Lake asphalt(b) Natural asphalt(c) Rock asphalt(d) Artificial asphaltI have been asked this question during an online interview.I'd like to ask this question from Miscellaneous Materials topic in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Right option is (d) Artificial asphalt Best explanation: Asphalt is divided into two CATEGORIES – natural and residual asphalt. Natural asphalt is OBTAINED from NATURE. Residual asphalt is also known as artificial asphalt.

Discussion

14.	Which of the following is not true about pozzuolana cement?(a) Pozzuolana cement can resist the action of sulphates(b) Less heat is evolved during its setting(c) Pozzuolana cement possesses a very low tensile strength(d) It imparts plasticity to the mortar prepared from itI had been asked this question in my homework.This key question is from Plain and Reinforced in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct option is (c) Pozzuolana cement possesses a very low tensile strength The BEST explanation: Pozzuolana cement possesses higher tensile strength and can resist the action of sulphates. It imparts plasticity to the MORTAR prepared from it and LESS heat is EVOLVED during its setting.

Discussion

15.	The colour of natural cement is __________(a) Brown(b) Black(c) White(d) YellowThis question was addressed to me during an interview.This intriguing question originated from Plain and Reinforced topic in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer»

Discussion

16.	Which of the following is not a solid fuel?(a) Petroleum(b) Charcoal(c) Coke(d) CoalI had been asked this question in unit test.I'm obligated to ask this question of Miscellaneous Materials in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Right choice is (a) PETROLEUM Easiest explanation: A fuel is a substance that is capable of creating heat energy which can be put to industrial use. Fuels are classified into three groups DEPENDING on the state in which they occur. These are solid fuels, liquid fuels and gaseous fuels. CHARCOAL, COKE and coal are examples of solid fuels while petroleum is a liquid fuel.

Discussion

17.	Which of the following is not a property of a good electrical insulator?(a) It has high electrical resistance(b) It has a high dielectric strength(c) It has a high dielectric constant(d) It has a high thermal resistanceI have been asked this question in an internship interview.My question is from Miscellaneous Materials topic in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Correct choice is (c) It has a high dielectric CONSTANT The best explanation: A good ELECTRICAL insulator has high electrical resistance and high THERMAL resistance. It has high dielectric STRENGTH and LOW dielectric constant.

Discussion

18.	Tensile strength of leather belts should be about _______(a) 75 kg/cm^2(b) 175 kg/cm^2(c) 275 kg/cm^2(d) 375 kg/cm^2I got this question at a job interview.My question is taken from Miscellaneous Materials in section Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» RIGHT answer is (b) 175 kg/cm^2 For explanation: TENSILE STRENGTH of leather belts should be about 175 kg/cm^2. Belts are used for DRIVING machinery, for running mechanical conveyors or for transmitting power.

Discussion

19.	We can obtain lake asphalt from lakes at _________(a) Bermudez and Trinidad(b) Argentina and Brazil(c) Chile and Colombia(d) Ecuador and MexicoThe question was asked during an interview.My enquiry is from Miscellaneous Materials in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The CORRECT choice is (a) BERMUDEZ and Trinidad The best I can EXPLAIN: Natural asphalt is divided into two groups – LAKE asphalt and rock asphalt. We can obtain lake asphalt from lakes at Bermudez and Trinidad at depths which VARY from 3-60 m.

Discussion

20.	Sodium fluosilicate added in the acid-resistant cement decreases the resistance of cement to water and acid and also retards the hardening process of soluble glass.(a) True(b) FalseI have been asked this question in an online interview.My question is taken from Plain and Reinforced topic in section Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct CHOICE is (b) False The best I can explain: An acid-resistant cement consists of acid-resistant aggregates like quartz, additives like SODIUM fluosilicate and soluble glass. Sodium fluosilicate added in the acid-resistant cement increases the resistance of cement to WATER and acid and also ACCELERATES the hardening process of soluble glass.

Discussion

21.	The specific surface of cement should not be lesser than __________(a) 550 cm^2/gm(b) 1250 cm^2/gm(c) 2250 cm^2/gm(d) 5250 cm^2/gmThe question was asked during an interview.Origin of the question is Plain and Reinforced topic in section Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct choice is (C) 2250 cm^2/gm The best I can explain: The specific surface serves as a MEASURE of the FREQUENCY of particles having an average size. The specific surface of cement should not be LESSER than 2250 cm^2/gm.

Discussion

22.	The coefficient of heat conductivity of heat-insulating materials does not exceed _________(a) 0.18 kcal/m.hr.°C(b) 0.28 kcal/m.hr.°C(c) 0.38 kcal/m.hr.°C(d) 0.48 kcal/m.hr.°CThis question was posed to me during an internship interview.This interesting question is from Miscellaneous Materials topic in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct CHOICE is (a) 0.18 kcal/m.hr.°C To elaborate: The COEFFICIENT of heat conductivity of heat-insulating materials does not EXCEED 0.18 kcal/m.hr.°C. These materials are NEEDED to give PROTECTION against heat and cold. They are generally porous.

Discussion

23.	The binding material present in asphalt is __________(a) Porcelain(b) Melamine(c) Bakelite(d) BitumenThe question was posed to me during an online interview.I want to ask this question from Miscellaneous Materials in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct answer is (d) Bitumen To ELABORATE: The binding material present in asphalt is bitumen. It is also called MINERAL TAR and is obtained by PARTIAL distillation of crude petroleum.

Discussion

24.	The ratio of the percentage of alumina to that of oxide of iron in the cement should not be less than ________(a) 0.24(b) 0.39(c) 0.66(d) 0.79This question was posed to me in an online interview.I'm obligated to ask this question of Plain and Reinforced in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» RIGHT answer is (c) 0.66 The best I can EXPLAIN: The ratio of the PERCENTAGE of alumina to that of oxide of iron in the cement should not be less than 0.66. However, the ratio of the percentage of LIME to those of iron oxide, alumina and SILICA should not be greater than 1.02.

Discussion

25.	The percentage of dicalcium silicate in belit is more than ________(a) 10%(b) 15%(c) 30%(d) 35%The question was posed to me in homework.Origin of the question is Plain and Reinforced in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Correct choice is (d) 35% Explanation: Portland CEMENT is CLASSIFIED into alit, ALUMINATE, BELIT, alumoferrite, etc. depending on the percentage of the MINERALOGICAL composition of clinker. The percentage of dicalcium silicate in belit is more than 35%.

Discussion

26.	Which of the following oils are obtained by mixing mineral oils with animal or vegetable oils?(a) Animal oils(b) Mineral oils(c) Greases(d) Blended oilsI got this question in an internship interview.Enquiry is from Miscellaneous Materials in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Right ANSWER is (d) Blended oils To explain: Blended oils are obtained by MIXING MINERAL oils with animal or VEGETABLE oils. Blended oils are ECONOMICAL. Also, the mineral oils become less volatile when animal oils or vegetable oils are added to them.

Discussion

27.	Which of the following is not a property of asphalt?(a) Asphalt is a good insulator of heat and electricity(b) Asphalt is waterproof material(c) Asphalt is inflammable(d) Asphalt is not attacked by acidsThis question was addressed to me by my college director while I was bunking the class.Query is from Miscellaneous Materials in section Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct choice is (C) Asphalt is inflammable Explanation: Asphalt is a good insulator of heat and ELECTRICITY. Asphalt is WATERPROOF material and non-inflammable. Asphalt is not attacked by acids.

Discussion

28.	___________ is the binding material of acid-resistant cement.(a) Lime(b) Soluble glass(c) Soda ash(d) Caustic sodaI have been asked this question in examination.The doubt is from Plain and Reinforced in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Correct answer is (B) Soluble glass Easy EXPLANATION: Soluble glass is the binding material of acid-resistant CEMENT. It is a water SOLUTION of potassium silicate or sodium silicate.

Discussion

29.	In the wet process in the manufacturing of portland cement, argillaceous material is thoroughly mixed with water in _________(a) Wash mill(b) Ball mill(c) Reverberatory furnace(d) Blast furnaceThe question was asked in exam.I'd like to ask this question from Plain and Reinforced topic in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct option is (a) Wash mill For explanation: In the manufacturing of portland cement, the raw materials can be mixed either in dry CONDITIONS or in wet conditions. In the wet process, argillaceous MATERIAL is thoroughly mixed with water in a wash mill while CALCAREOUS materials are CRUSHED and stored in storage tanks.

Discussion

30.	Buna-S, Neoprene and Butyl are different trade names of _________(a) Natural rubber(b) Synthetic rubber(c) Lubricants(d) Animal oilsI have been asked this question during an interview.The above asked question is from Miscellaneous Materials in section Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Correct OPTION is (b) Synthetic RUBBER To explain: Rubber can be either natural or synthetic. Buna-S, Neoprene and Butyl are different trade NAMES of synthetic rubber. Synthetic rubber refers to the rubber-like materials produced by chemical PROCESSES.

Discussion

31.	In England, high alumina cement is known by the trade name of ___________(a) Lumnite(b) Lumnite Fondu(c) Limonite(d) Cement FonduThe question was asked during an online interview.Asked question is from Plain and Reinforced in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Right option is (d) CEMENT Fondu The EXPLANATION: In England, HIGH alumina cement is known by the trade name of Cement Fondu. HOWEVER, in America, it is known by the trade name of Lumnite. This cement can stand high temperatures.

Discussion

32.	Which of the following is the quickest to react with water when the water is added to the cement?(a) Tetra-calcium alumino-ferrite(b) Tricalcium silicate(c) Dicalcium silicate(d) Tricalcium aluminateI have been asked this question at a job interview.My question comes from Plain and Reinforced topic in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct CHOICE is (d) Tricalcium ALUMINATE The explanation is: Tricalcium aluminate is the quickest to react with WATER when the water is added to the cement. In the ORDER of decreasing rate are tetra-calcium alumino-ferrite, tricalcium silicate and dicalcium silicate.

Discussion

33.	The resistance to water of acid-resistant cement is increased by adding __________ of linseed oil.(a) 0.50%(b) 0.15%(c) 2.50%(d) 2.75%This question was addressed to me during an internship interview.Question is from Plain and Reinforced in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The CORRECT choice is (a) 0.50% The best I can explain: Acid-resistant CEMENT is not WATER-resistant. However, the resistance to water of acid-resistant cement is increased by adding 0.50% of linseed OIL. It is then called acid and water-resistant cement.

Discussion

34.	Which of the following is not a synthetic abrasive?(a) Carbides of aluminium(b) Boric acid(c) Corundum(d) SiliconThis question was addressed to me in my homework.My question comes from Miscellaneous Materials topic in section Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Correct choice is (c) CORUNDUM For EXPLANATION I WOULD say: Synthetic abrasives or artificial abrasives can be prepared of desired quality and their manufacturing allows the exact duplication of the product. Examples of synthetic abrasives are carbides of aluminium, silicon, boric acid etc. Corundum is an example of a NATURAL abrasive.

Discussion

35.	The substance which is used for removing the excess material by means of cutting is called ____________(a) Abrasive(b) Adhesive(c) Cohesive(d) AsphaltI had been asked this question in final exam.Origin of the question is Miscellaneous Materials in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Correct choice is (a) Abrasive The best I can explain: The substance which is USED for removing the excess material by means of cutting is called an abrasive. They are the hardest materials. They are used to polish SOFT materials and provide them with an ATTRACTIVE appearance.

Discussion

36.	The presence of chromium oxide in cement imparts _________ colour.(a) Green(b) Orange(c) Blue(d) RedThis question was posed to me during an internship interview.This intriguing question comes from Plain and Reinforced in section Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct answer is (a) Green To elaborate: We can OBTAIN cement of desired colour by mixing mineral pigments with the ORDINARY cement. The presence of chromium OXIDE in cement IMPARTS a green colour.

Discussion

37.	During the setting action of the cement, tricalcium aluminate is formed within ________ after adding water to the cement.(a) 6 hours(b) 24 hours(c) 4 days(d) 1 weekThis question was posed to me in an interview.I want to ask this question from Plain and Reinforced in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Correct choice is (b) 24 HOURS Explanation: During the setting action of the cement, tricalcium ALUMINATE and tetra-calcium alumino-ferrite are FORMED within 24 hours after adding WATER to the cement. However, tricalcium silicate is formed within a WEEK.

Discussion

38.	Which of the following is not true about cork?(a) It is obtained from the bark of cork oak trees(b) Cork is a good conductor of sound and electricity(c) Cork is porous(d) Cork is not attacked by heat and moistureThe question was posed to me during an interview.The doubt is from Miscellaneous Materials topic in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Right option is (b) CORK is a GOOD conductor of sound and electricity For explanation I WOULD SAY: Cork is porous and is a good insulator of sound and electricity. It is OBTAINED from the bark of cork oak trees and is not attacked by heat and moisture.

Discussion

39.	Which of the following is not a solid lubricant?(a) Graphite(b) Mica(c) Grease(d) SoapstoneI have been asked this question in an interview.I want to ask this question from Miscellaneous Materials in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct answer is (c) Grease The BEST I can explain: With the use of lubricants, easy motion of the moving parts of a machine is facilitated. There are two types of lubricants – solid lubricants and liquid lubricants. GRAPHITE, MICA and SOAPSTONE are examples of solid lubricants while grease is a liquid lubricant.

Discussion

40.	Portland cement was invented by ___________(a) John Raymond(b) Joseph Aspdin(c) Charles Frank(d) James WatsonI have been asked this question by my school principal while I was bunking the class.The origin of the question is Plain and Reinforced in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Correct ANSWER is (b) Joseph Aspdin To explain: The COMMON variety of artificial cement is called ordinary cement or normal SETTING cement. This cement after setting closely resembles a variety of sandstone abundantly found in Portland in England. Portland cement was INVENTED by Joseph Aspdin in 1824.

Discussion

41.	Which of the following should be added to the plaster of Paris in order to increase its setting time?(a) Alum(b) Potassium sulphate(c) Potassium nitrate(d) Citric acidThis question was posed to me in exam.This intriguing question comes from Miscellaneous Materials in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct choice is (d) Citric ACID To explain I would say: To increase the setting TIME of the plaster of Paris, suitable retarders are added in it. Citric acid, clay, gum, glue, starch, etc. are all examples of such retarders.

Discussion

42.	Total sulphur content in the cement should not be more than _________(a) 1.75%(b) 2.75%(c) 5.25%(d) 7.25%I had been asked this question by my school principal while I was bunking the class.This interesting question is from Plain and Reinforced in section Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The correct option is (B) 2.75% The best I can EXPLAIN: SULPHUR content in the cement is CALCULATED as sulphur trioxide. Total sulphur content in the cement should not be more than 2.75%.

Discussion

43.	It results in the failure of concrete made from the cement if the amount of alkali oxides in it exceeds _________(a) 1%(b) 5%(c) 12%(d) 17%I have been asked this question by my college professor while I was bunking the class.Asked question is from Plain and Reinforced topic in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» CORRECT option is (a) 1% The explanation is: The PRESENCE of alkali OXIDES and MAGNESIUM oxide badly affects the quality of the cement. It results in the FAILURE of concrete made from the cement if the amount of alkali oxides in it exceeds 1%.

Discussion

44.	Which of the following oils is obtained by boiling fats and other parts of cattle with water?(a) Lard oil(b) Whale oil(c) Neat’s foot oil(d) Tallow oilThe question was posed to me in my homework.The above asked question is from Miscellaneous Materials in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The CORRECT option is (c) Neat’s foot oil Explanation: Neat’s foot oil is OBTAINED by BOILING FATS and other parts of cattle with water. The specific GRAVITY of this oil is 0.916. Neat’s foot oil is used for delicate mechanisms like clocks, sewing machines, etc.

Discussion

45.	The power to resist an electric stress is called as ___________(a) Dielectric strength(b) Conduction(c) Insulation(d) DielectricI got this question by my college director while I was bunking the class.This interesting question is from Miscellaneous Materials topic in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Right OPTION is (a) Dielectric strength Best explanation: The power to resist electric stress is CALLED dielectric strength. Dielectric is USED to refer to a SUBSTANCE that is CAPABLE of supporting electric stress.

Discussion

46.	The percentage content of water and calcium sulphate in gypsum is _______ and _______ respectively.(a) 20.9, 79.1(b) 15.4, 84.6(c) 30.7, 69.3(d) 55.3, 44.7This question was addressed to me during an interview.I'm obligated to ask this question of Miscellaneous Materials topic in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Correct option is (a) 20.9, 79.1 For explanation I WOULD say: Gypsum is the HYDRATED sulphate of CALCIUM and is a white crystalline SUBSTANCE. The percentage content of water and calcium sulphate in gypsum is 20.9 and 79.1 respectively.

Discussion

47.	Which of the following is not a hydrophobic admixture?(a) Lime silicate(b) Acidol(c) Naphthenesoap(d) Oxidised petrolatumThis question was posed to me in unit test.This key question is from Plain and Reinforced topic in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Correct option is (a) LIME silicate To explain I would say: Hydrophobic CEMENT CONSISTS of admixtures that are USED to reduce the wetting ability of the cement grains. The usual hydrophobic admixtures used are acidol, oxidised petrolatum and naphthenesoap.

Discussion

48.	The presence of cobalt in cement imparts _________ colour.(a) Yellow(b) Blue(c) Black(d) WhiteThis question was addressed to me during an online interview.I'm obligated to ask this question of Plain and Reinforced topic in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» Right option is (b) BLUE The explanation: The presence of cobalt in CEMENT IMPARTS blue colour. However, manganese DIOXIDE is used to give black or brown coloured cement and oxide of iron in various PROPORTIONS provide brown, yellow or red colour.

Discussion

49.	The amount of inert filler in plastic bitumen is about _________(a) 5-15%(b) 40-45%(c) 60-75%(d) 80-95%This question was addressed to me in an interview.My question comes from Miscellaneous Materials topic in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» RIGHT choice is (b) 40-45% For explanation: Plastic bitumen consists of bitumen, a SUITABLE inert filler and a thinner. The amount of inert filler in plastic bitumen is about 40-45%. Plastic bitumen is used to fill CRACKS in MASONRY structures.

Discussion

50.	Rubber glues are obtained by dissolving rubber in _________(a) Alcohol(b) Glycerol(c) Benzene(d) PhenolI have been asked this question in an online interview.My query is from Miscellaneous Materials in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials
Answer» The CORRECT choice is (C) Benzene The explanation is: Rubber glues are obtained by DISSOLVING rubber in benzene. They are extensively used for JOINING rubber, GLASS, plastics, etc.

Discussion

Explore topic-wise InterviewSolutions in .

The thermo-plastic glues are permanent once they are set.(a) True(b) FalseThis question was addressed to me in an interview for job.Asked question is from Miscellaneous Materials in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials

High-alit contains tricalcium silicate more than ________(a) 10%(b) 13%(c) 30%(d) 60%I had been asked this question during an online interview.The doubt is from Plain and Reinforced in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials

Which of the following is not a solid fuel?(a) Petroleum(b) Charcoal(c) Coke(d) CoalI had been asked this question in unit test.I'm obligated to ask this question of Miscellaneous Materials in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials

The percentage of dicalcium silicate in belit is more than ________(a) 10%(b) 15%(c) 30%(d) 35%The question was posed to me in homework.Origin of the question is Plain and Reinforced in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials