1)What is the advantages of gypsum?

a)fire proofing ( X)       b)heattreatment ( )        c)cheap ( )     d)disintegrate in the moisture ( )

2) Where can use the hydraulic lime?

a)bridge ()              b)building ( X)         c)under sea ()          d)roads ( )

3) Why alkali oxides (Na2O and K2O ) in cement are harmful ?because they:

a) increase heat of hydration ()    b)decrease strength of cement( )   c)react with alkali of aggregates( )

d)retard the setting time of cement ( )

4)Loss Of Ignition (LOL) indicates _____ or _____ due toprologned or improper storage:

a)prehydation or oxidation ()      b)prehydration orcarbonation ( )   c)oxidation orcarbonation ( )

d) non of them ( )

5)which oxide of cement hydrates later than others:

a)SiO₂ ()            b)Fe₂O₃( )        c)K₂O ()        d) CaO ( )

6)Which components of cement hydrates faster:

a) C₃S ()             b)C₂S (  )        c)C₃A ()            d) C₄AF ( )

7) Which rock is not an ingnious rock:

a)shale ( )     b)pumice ()       c)Quartz ()     d)basalt ( )

8)Whrere can use the “specific gravity” of aggregates inconcrete? To calculate:

a)mix design ( )    b) abrasion resistance ( )   c)compressive strength ()   d)splitting tensile strength ( )

9)Which test is usefull for determining the workability of“Fiber Reinforced Concrete” ?

a)slump test ( )   b)compacting factor ( )  c)flow table ( )   d) Vebe test ( )

10)Which factor does not have affecting on drying shrinkage?

a)size and shape of structure ()                                       b)amount of distribution of aggregates ()                                           c)amount of distribution of reinforcement ()                 d)humidity of enviroment (   )

11) Which type of shrinkage occur before concrete has set?

a)carbonation shrinkage ( )  b)plastic shrinkage ( )  c)autogenous shrinkage ( )d)drying shrinkage ( )

12) Which factor is related to Internal Durability ?

a)permeability ( )        b)volumechange of aggregates ( )           c)alkalireaction ( )                                            d)attackof industrial liquids ( )

13)Which factor has been affected on workability ofconcrete?

a)W/C ratio ()       b)shape ofaggregates ( ) c)grading of aggregates ()   d)all components ( )

14) The chemical reaction between water and cement known as___________?

a)oxidation (   )   b)hydration (  )     c)carbonation(   )    d)calcination ( )

15) During slaking of lime heat evolves and _______?

a)burn lime ( )    b)volume expands ( )  c) hydration strated ( ) d)reactwith water ( )

16)Which fault occur due to the improper vibration ofconcrete?

a)shrinkage ( )  b)compation ( )   c)segregation ( )   d)bleeding ( )

17)What kind of aggregate can reacti with cement?

a)fine aggregates ( )  b)coarse aggregates ( )  c)alkali aggregates ( )   d)methamorphic rocks ( )

18) during the handiling of fresh concrete, what are the mostimportant factors affecting on selection method?

a)econimic ( )       b) maintained thequality of concrete ( )              c)increasestrength of concrete ( )    d) aand b ( )

19) __________ in the pure state is white but combined withimpurities it may grey, brown or reddish brown?

a)gypsum ()       b)lime(   )         c)cement( )      d)sedimantaryrocks ( )

20)which type of cement is suitable for concreting in coldwheater ?

a) Ordinary PC( )   b)rapid hardening PC ( )   c)low heat PC ( )   d)sulfate resistance PC ( )

21) which type of cement is used for concerting in seawater?

a)Ordinary PC ( )    b)sulfate resistance PC ( )     c) high aluminum Cement ()                                                   d)white portland cement ( )

22 ) which type of cement is used in dam constructions?

a) masonary cement( )   b)rapid hardening PC ()        c)low heat PC ( )    d)sulfate resistance PC ( )

23) Which type of cement is only used for architecturalpurpose?

a) ground granulated blast furnance slage ()   b)natural cement ()     c)wihte portland cement( ) d)portland pozzolan cement ( )

24)which test is used for low workable concrete?

a) slump test (   )    b)compacting factor ( )   c) flow test ( )     d) kelly ball test ( )