1. Which of the following aggregates gives maximum strength in concrete? (a) Rounded aggregate (b) Elongated aggregate (c) Flak aggregate (d) !ubical aggregate ". #he maximum bulking of sand is likel to occur at a moisture content of (a) $% (b) &% (c) 11% (d) 1'% . atch *ist+, (-roert) with *ist+,, (!haracteristic) (!haracteristic) and select the correct answer using the codes given below the lists/ *ist+, *ist+,, (Property) (Characteristic) 0. ecific heat of an aggregate 1. 2reaks the bond between the aggregate and the aste 2. #hermal conductivit conductivit of aggregate ". ,s a measure of its heat caacit !. #hermal exansion . ,s affected b difference in thermal exansion of two different material 3. 3urabilit of concrete '. ,s a measure of its abilit to conduct heat !odes/ (a) 0 2 ! 3 (b) 0 2 ! 3 1"' "'1 (c) 0 2 ! 3 (d) 0 2 ! 3 1'" "1' '. #he aggregate crushing value of coarse aggregates4 which is used for making concrete4 which in turn is used for uroses other than wearing surfaces should not exceed (a) 5% (b) '5% (c) '$% (d) $5% $. Which of the following coarse aggregate re6uire minimum cement aste? (a) Rounded (b) ,rregular (c) 0ngular (d) Flak 7. For high strength concrete the best aggregate is (a) rounded (b) irregular (c) angular (d) all+in+aggregate all+in+aggregate 8. 0ggregate affecting durabilit of concrete most are (a) rounded (b) all+in+aggregate all+in+aggregate (c) flak (d) irregular &. #he best reflection of strength of coarse aggregate is given b (a) crushing (b) imact (c) 15 er cent fines (d) hardness 9. Which of the following airs is not matched matched correctl with regards regards to coarse aggregate : 15 mm ? (a) trength 15 er cent fine (b) #oughness ,mact test (c) ;ardness 0brasion set (d) . gr. -cnometer
1. (d)
". (a)
. (b)
'. (c)
$. (a)
7. (c)
8. (c)
&. (a)
9. (d)
OBJECTIVE TYPE QUESTIONS
1. #he effects of imurities in water are exressed in terms of <<<<<<<<<<<<<<<<<<< of -ortland cement. (a) initial setting time
(b) final setting time
(c) comressive strength
(d) soundness
". #he difference in 8 das comressive strength of cubes and clinders reared with imure and ure waters should not differ b more than (a) "%
(b)
%$(c) 15%
(d) 1"%
. #he uer limit of susended articles in water for the rearation of concrete is (a) "55 m
(b) "555 m
(c) $555 m
(d) 154555 m
'. =rganic matter in water for making concrete should not be more than (a) 1555 m
(b) 555 m
(c) 15555 m
(d) 1$4555 m
$. !onsider the following statement in making concrete with sea water. 1. trength of concrete is reduced b about 15+"5% ". etting time accelerates . !orrosion of reinforcement is not a roblem if concrete is of good 6ualit =f the above statements (a) 1 and " are correct
(b) 1 and are correct
(c) onl 1 is correct
(d) 14 "4 are correct
7. !onsider the following statements/ #he effect of sea water on hardened concrete is to 1. increase its strength
". reduce its strength
. retard setting
'. decrease its durabilit
=f these statements (a) 1 and are correct
(b) " and are correct
(c) " and ' are correct
(d) 1 and ' are correct
1. (a)
". (c)
. (b)
'. (d)
$. (d)
7. (c)
*ime
OBJECTIVE TYPE QUESTIONS 1. -ick u the correct statement(s) (1) !a!= is the raw material for manufacturing lime (") >ankar is an imure limestone () !oral for manufacturing lime is a sea animal =f the above the correct statement(s) is (are) (a) 14 " (b) "4 (c) 14 "4 (d) 1 onl ". Which of the following is caustic lime? (a) uick lime (b) Fat lime (c) ilk lime (d) ;draulic lime . uick lime coming out of the kiln is also known as (a) hdrated lime (b) lum lime (c) fat lime (d) hdraulic lime '. ;drated lime for making mortars is slaked for (a) 1 da (b) das (c) 8 das (d) 1' das $. Which of the following is not used for roducing fat lime? (a) =olitic limestone (b) !alcareous tufa (c) arble (d) Raw lime stone 7. #he lime sets on absorbing != " from atmoshere is (a) lean lime (b) feebl hdraulic lime (c) rich lime (d) fat lime 8. #he lime used fur finishing coat in lastering is (a) semi hdraulic lime (b) kankar lime (c) magnesium lime (d) eminentl hdraulic lime &. ;draulic lime is obtained b burning (a) oolitic lime stone (b) kankar (c) marble (d) tufa 9. Fat lime slakes between (a) "+ hours (b) "' hours (c) das (d) 8 das 15. atch *ist+, with *ist+,, and select the correct answer using the codes given below the lists/ List-I List-II 0. ilica 1. hdraulic roerties 2. !la ". oor cementing !. ulhates . increased ratio of setting '. reduce setting time !odes/ (a)0 2 ! (b) 0 2 ! "1 '"1 (c)0 2 ! (d) 0 2 ! '1 "1 1. (c) ". (a) . (b) '. (a) $. (d) 7. (a) 8. (c) &. (b) 9. (a) 15. (a)
-u@@olana
OBJECTIVE TYPE QUESTIONS 1. Which of the following is not true with regards to relacement of cement artl b u@@olana in making concrete? (a) ,mermeable concrete at later ages (b) ore resistance to sulhate attack (c) Reduction in bleeding and segregation (d) Reduction in setting time. ". Which of the following is not natural u@@olana? (a) Aolcanic tuff (b) 3iatomaceous earth (c) urkhi (d) Rhenish . When combined with cement which of the following constituents of u@@olana combine with free lime released during the hdration of cement? (a) i=" (b) 0l"= (c) Fe"= (d) g= '. #he best alication of u@@olana in cement concrete is in (a) dams (b) bridges (c) R!! slabs (d) domes $. !onsider the following statements with regards to fl ash to be used for making concrete 1. #he carbon content should be as low as ossible ". #he fineness of fl ash should be as high as ossible . #he silica in fl ash should be in finel divided state =f the above statements (a) onl 1 is correct (b) 14 " are correct (c) 14 "4 are correct (d) "4 are correct 7. urkhi is added to lime mortar to (a) revent shrinkage (b) decrease setting time (c) increase bulk (d) imart hdraulicit 8. 2last furnace slag has aroximatel (a) '$% calcium oxide and about $% silica (b) $5% alumina and "5% calcium oxide (c) "$% magnesia and 1$% silica (d) "$% calcium sulhate and 1$% alumina &. !onsider the following statements/ -u@@olana used as an admixture in concrete has the following advantages/ 1. ,t imroves workabilit with lesser amount of water ". ,t increases heat of hdration and so sets the concrete 6uickl . ,t increases resistance to attack b salts and sulhates '. ,t leaches calcium hdroxide elect the correct answer using the codes given below/ !odes/ (a) 14 "4 and ' (b) 14 " and ' (c) 1 and (d) "4 and ' 1. (d) ". (c) . (a) '. (a) $. (c) 7. (d) 8. (a) &. (c)
!oncrete ix 3esign
OBJECTIVE TYPE QUESTIONS 1. #o make one cubic meter of 1/"/' b volume concrete4 the volume of coarse aggregate re6uired is (a) 5.9' m (b) 5.&$ m (c) 5.8$ m (d) 5.7$ m ". ,f in a concrete mix the fineness modulus of coarse aggregate is 8.74 the fineness modulus of fine aggregate is ".& and the economical value of the fineness modulus of combined aggregate is 7.'4 then the roortion of fine aggregate is (a) "$% (b) .% (c) $5% (d) 77.78% . With the same wBc ratio4 the lower the maximum si@e of aggregate the strength of concrete (a) increases (b) decreases (c) remains same (d) canCt sa '. When the cement content and workabilit are ket constant4 the greater roortion of fine aggregate will be re6uired if (a) maximum si@e of aggregate is more (b) maximum si@e of aggregate is small (c) all in aggregate is used (d) rounded coarse aggregate is used $. -ick out the incorrect statement. (a) #o check segregation the s. gr. of fine aggregate should not be more than that of coarse aggregate (b) When concrete is to be laced under water more fine aggregate is used to rovide cohesiveness (c) For high workabilit fine aggregate re6uired will be more (d) With small maximum si@e of coarse aggregate a small roortion of fine aggregate will be re6uired 7. Following data is available in a mix design Coarse aggregate 2atch weight 1$5 kgBm Water absortion "% Fine aggregate 2atch weight $55 kgBm Water absortion 5.$% #he inference made from the above data isBare/ 1. #he 6uantit of coarse aggregate should be decreased b "8 kg. ". #he 6uantit of fine aggregate should be increased b ".$ kg. . #he 6uantit of mixing water er m should be increased b "9.$ kg. =f the above4 the correct answer is (a) 14 " and (b) 1 and " (c) " and (d) 1 and 8. #he cement content in a mix design is 8& kgBm4 water content 185 kg4 sand is 5% of total aggregate4 entraed air is 1%4 s. gr of cement4 coarse aggregate and fine aggregate are resectivel .1$4 ".85 and ".75. #he fine aggregate will be aroximatel (a) $15 kg (b) $$5 kg (c) 755 kg (d) '$5 kg 1. (b) ". (b) . (a) '. (b) $. (d) 7. (d) 8. (b)
-olmers
OBJECTIVE TYPE QUESTIONS 1. Which of the following is not a ceramic material? (a) Dlass (b) !la (c) *ime (d) 0brasives ". Which of the following roerties ceramics do not osses? (a) ;ardness (b) 2rittleness (c) Elasticit at low temerature (d) aleabilit . #he tensile strength of glass ma be (a) 15 Bmm" (b) $5 Bmm" (c) &5 Bmm" (d) 155 Bmm" '. #he accelerator added for the fusion of glass is (a) soda (b) silica (c) lime (d) nickel $. #he examle of glass makerCs soa is (a) nickel oxide (b) cobalt oxide (c) manganese dioxide (d) cullets 7. !rown glass is an examle of (a) soda+lime glass (b) lead glass (c) boro+silicate glass (d) sheet glass 8. Which of the following glass is most suitable to withstand high temeratures? (a) soda+lime glass (b) lead glass (c) boro+silicate glass (d) temered glass &. #he metal oxide used to make emerald green glass is (a) n=" (b) !r "=8 (c) cobalt oxide (d) iron oxide 1. (c) ". (d) . (b) '. (a) $. (c) 7. (a) 8. (c) &. (b)
ecial cement and cement concrete
OBJECTIVE TYPE QUESTIONS 1. ,n restressed concerete concrete of high strength is used. !onsider the following statements/ 1. ,t results in smaller cross+section ". 2earing stresses are generated in anchorage @ones . hrinkage cracks are reduced =f the above the correct statements are/ (a) 1 and " (b) " and (c) and 1 (d) 14 " and ". #he ultimate tensile strength of high tensile strength steel is about (a) "$5 Bmm" (b) '$5 Bmm" (c) $1$ Bmm" (d) "555 Bmm" . Which of the following is not modified for betterment in olmer concrete? (a) 2ond (b) trength (c) =il resistance (d) 2rittleness '. #he commerciall successful fibres in fibre reinforced concrete are of (a) asbestos (b) glass (c) steel (d) carbon $. #he ull out resistance of fibres in fibre reinforced concrete does not deend uon (a) number of fibres crossing the crack (b) length of fibres (c) diameter of fibres (d) tensile strength of fibres 7. #he thickness of ferrocement ma be (a) "5 mm (b) $5 mm (c) 8$ mm (d) 155 mm 8. o fines concrete is (a) light weight concrete (b) heav weight concrete (c) fibre reinforced concrete (d) ferro cement &. Which of the following is not a light weight concrete (a) o fines concrete (b) !ellular concrete (c) Foam concrete (d) -restressed concrete 9. !oncrete recommended for radiation shielding is (a) light weight concrete (b) heav weight concrete (c) fibre reinforced concrete (d) read mixed concrete 15. Which one of the following tes of concrete is most suitable in extreme cold climates? (a) 0ir+entrained (b) Read mix concrete (c) Aacuum concrete (d) ;eav weight concrete 11. 2acterial concrete is one that (a) is affected b bacteria (b) is laced in marine conditions (c) is used in olluted environment (d) has auto crack healing caacit 1". elf+comacting concrete is characteri@ed b (a) high owder comonent (b) high water+owder ratio (c) cementitious materials u to 5%. (d) rough surface finish. 1. (d)
". (d)
. (d)
'. (a)
$. (d)
7. (a)
8. (c)
&. (d)
9. (b)
15. (a)
11. (d)
1". (a)
isc. materials
OBJECTIVE TYPE QUESTIONS 1. #he adhesive recommended for structural uroses is (a) silane resin (b) glues (c) rubber toughened eox (d) acrlic ". eorene is a (a) organic solvent thinned adhesive (b) latex adhesive (c) water+disersed adhesive (d) two+ackage adhesive . 3extrin adhesive is (a) active and nonolar (b) vinl coolmer (c) made from starch (d) an eox adhesive '. #he material recommended for roofing is (a) linolium (b) asbestos (c) thermocole (d) geosnthetic $. Which of the following is a cellular lastic material? (a) #hermocole (b) *inoleum (c) eorene (d) 0sbestos 7. Which of the following is not used in the making of geosnthetics? (a) lon (b) -A! (c) -olroelene (d) !eramics
