McqMate
| 101. |
What are plasticizers? |
| A. | Which adds water for workability |
| B. | Which reduces water for workability |
| C. | Which decreases workability at the same water content |
| D. | Which oxidizes water for workability |
| Answer» B. Which reduces water for workability | |
| 102. |
What is the amount used of plasticizers in cement by weight? |
| A. | 0 |
| B. | 1-.4% |
| C. | 1% |
| D. | 1-2% |
| Answer» B. 1-.4% | |
| 103. |
What is the allowed reduction of water with super plasticizers without reducing workability? |
| A. | 10% |
| B. | 20% |
| C. | 30% |
| D. | 40% |
| Answer» C. 30% | |
| 104. |
What is accelerator? |
| A. | Which speed up the initial set of concrete |
| B. | Which delays the initial set of concrete |
| C. | Which speed up the final set of concrete |
| D. | Which delays the final set of concrete |
| Answer» A. Which speed up the initial set of concrete | |
| 105. |
What is retender? |
| A. | Which speed up the initial set of concrete |
| B. | Which delays the initial set of concrete |
| C. | Which speed up the final set of concrete |
| D. | Which delays the final set of concrete |
| Answer» B. Which delays the initial set of concrete | |
| 106. |
NaOH is the example of retenders. |
| A. | True |
| B. | False |
| C. | none |
| D. | all |
| Answer» B. False | |
| 107. |
Pick up the correct statement from the following. |
| A. | Calcium fluosilicates act as a retarders |
| B. | CaCl2 acts as a retarders |
| C. | Gypsum acts as a retarders |
| D. | Gypsum acts as an accelerators |
| Answer» C. Gypsum acts as a retarders | |
| 108. |
Retarders used at grouting oil wells, where temperature is about _____________ oC. |
| A. | 100 |
| B. | 150 |
| C. | 200 |
| D. | 250 |
| Answer» C. 200 | |
| 109. |
Silica fume is ______________ |
| A. | Less reactive |
| B. | Neutral |
| C. | More reactive |
| D. | Absent in concrete |
| Answer» C. More reactive | |
| 110. |
What is the content of SiO2 in fly ash? |
| A. | 30-60% |
| B. | 15-30% |
| C. | Up to 30% |
| D. | 1-7% |
| Answer» A. 30-60% | |
| 111. |
Air entrainment in concrete increases ___________ |
| A. | Strength |
| B. | Workability |
| C. | The effect of temp variations |
| D. | The unit weight |
| Answer» B. Workability | |
| 112. |
What is curing? |
| A. | Dehydration |
| B. | Hydration |
| C. | Drying |
| D. | Dipping |
| Answer» B. Hydration | |
| 113. |
What is the gel/space ratio? |
| A. | Volume of water to the volume of cement |
| B. | Volume of the hydrated cement paste to the sum of volumes of the hydrated cement |
| C. | Volume of the hydrated cement paste to the sum of volumes of the hydrated cement and of the capillary pores |
| D. | Volume of gel to the volume of space present in the concrete |
| Answer» C. Volume of the hydrated cement paste to the sum of volumes of the hydrated cement and of the capillary pores | |
| 114. |
Gel/Space ratio = x = Volume of gel / Space available = 0.657 C / 0.319 C+ Wo. Here Wo stands for? |
| A. | Weight of cement in kg |
| B. | Weight of cement in g |
| C. | Volume of gel |
| D. | Volume of mixing water in ml |
| Answer» D. Volume of mixing water in ml | |
| 115. |
This strain increases over time due to _________ |
| A. | Creep |
| B. | Elastic modulus |
| C. | Short term modulus of elasticity |
| D. | Long term modulus of elasticity |
| Answer» A. Creep | |
| 116. |
If the stress is removed, the specimen shows an instantaneous recovery strain ___ the elastic strain on loading. |
| A. | Higher than |
| B. | Lower than |
| C. | Equal to |
| D. | Much greater than |
| Answer» B. Lower than | |
| 117. |
Creep ___ as the age of application of load _____ |
| A. | Increase, increase |
| B. | Increase, decrease |
| C. | Decrease, decrease |
| D. | Decrease, increase |
| Answer» D. Decrease, increase | |
| 118. |
Shrinkage is the reduction in the volume of a fresh hardened concrete exposed to ambient temp and humidity. |
| A. | True |
| B. | False |
| C. | none |
| D. | all |
| Answer» A. True | |
| 119. |
Durability of concrete is proportional to _________ |
| A. | Sand content |
| B. | Water cement ratio |
| C. | Aggregate ratio |
| D. | Cement aggregate ratio |
| Answer» D. Cement aggregate ratio | |
| 120. |
For concrete exposed to a very aggressive environment the w/c should be lower than __________ |
| A. | 1 |
| B. | .5 |
| C. | 4 |
| D. | .8 |
| Answer» C. 4 | |
| 121. |
The quality of concrete, specifically a ____________ w/c ratio, is the best protection against sulphate attack. |
| A. | High |
| B. | Medium |
| C. | Low |
| D. | Very low |
| Answer» C. Low | |
| 122. |
The continuous strain, which the concrete undergoes due to application of external loads, is called __________ |
| A. | Workability |
| B. | Segregation |
| C. | Bleeding |
| D. | Creep |
| Answer» D. Creep | |
| 123. |
Harshness in concrete is due to the excess of _____________ |
| A. | Water |
| B. | Finer particles |
| C. | Middle sized particle |
| D. | Coarser particle |
| Answer» C. Middle sized particle | |
| 124. |
__________ has designated the concrete mixes into a number of grades as M10, M15. |
| A. | IS 456-2000 |
| B. | IS 456-2010 |
| C. | IS 513-1999 |
| D. | IS 465-2000 |
| Answer» A. IS 456-2000 | |
| 125. |
What is the approx. mix proportion for M10? |
| A. | 1:3:6 |
| B. | 1:2:4 |
| C. | 1:1.5:3 |
| D. | 1:1:2 |
| Answer» A. 1:3:6 | |
| 126. |
Quality control helps to ___________ the risks of overdesign that ___________ the overall cost. |
| A. | Maximize, Increase |
| B. | Minimize, Increase |
| C. | Maximize, Decrease |
| D. | Minimize, Decrease |
| Answer» D. Minimize, Decrease | |
| 127. |
The cement concrete, from which entrained air and excess water are removed after placing it in position, is called ________ |
| A. | Vacuum concrete |
| B. | LWC |
| C. | Prestressed concrete |
| D. | Sawdust concrete |
| Answer» A. Vacuum concrete | |
| 128. |
The light-weight concrete is prepared by ____________ |
| A. | Mixing Portland cement with sawdust in specified proportion in the concrete |
| B. | Using coke-breeze, slag as aggregate in the concrete |
| C. | Mixing Al in the concrete |
| D. | Mixing Fe in the concrete |
| Answer» B. Using coke-breeze, slag as aggregate in the concrete | |
| 129. |
Aerated Concrete is ______________ |
| A. | Very heavy weight |
| B. | Heavy weight |
| C. | Medium weight |
| D. | Light weight |
| Answer» D. Light weight | |
| 130. |
No fines concrete is manufactured by _____________ |
| A. | By adding no fines materials from normal concrete |
| B. | By eliminating no fines materials from normal concrete |
| C. | By reducing its strength |
| D. | By increasing its strength |
| Answer» B. By eliminating no fines materials from normal concrete | |
| 131. |
Density of no fines concrete with light weight aggregate vary from ________ kg/m3. |
| A. | 1600-1900 |
| B. | <300 |
| C. | >2500 |
| D. | >300 |
| Answer» B. <300 | |
| 132. |
Diameter of Round Steel Fiber lies in the range of ________ mm. |
| A. | .3-.5 |
| B. | .25-.75 |
| C. | .155-.41 |
| D. | .25-.90 |
| Answer» B. .25-.75 | |
| 133. |
Air contents should be _________ % by volume. |
| A. | 1-2 |
| B. | 2-3 |
| C. | 3-4 |
| D. | 4-5 |
| Answer» C. 3-4 | |
| 134. |
Which one is not used as air entraining agents? |
| A. | Alumina |
| B. | Natural resins |
| C. | Fats |
| D. | Oil |
| Answer» A. Alumina | |
| 135. |
What is wet process? |
| A. | Grinding and mixing of the raw materials in their dry state |
| B. | Grinding and mixing of the raw materials in their medium state |
| C. | Grinding and mixing of the raw materials in their wet state |
| D. | Grinding and mixing of the raw materials in their overheated state |
| Answer» C. Grinding and mixing of the raw materials in their wet state | |
| 136. |
Excess in lime causes _______ |
| A. | The cement to shrink and integrate |
| B. | The cement to shrink and disintegrate |
| C. | The cement to expand and integrate |
| D. | The cement to expand and disintegrate |
| Answer» D. The cement to expand and disintegrate | |
| 137. |
Silica in excess causes ________ |
| A. | The cement to set slowly |
| B. | The cement to set quickly |
| C. | The cement to expand |
| D. | The cement to disintegrate |
| Answer» A. The cement to set slowly | |
| 138. |
Alumina in excess causes _________ |
| A. | Reduces the strength of the cement |
| B. | Increases the strength of the cement |
| C. | none |
| D. | all |
| Answer» A. Reduces the strength of the cement | |
| 139. |
Which compound gives the colour to the cement? |
| A. | Lime |
| B. | Silica |
| C. | Iron Oxide |
| D. | Alumina |
| Answer» C. Iron Oxide | |
| 140. |
Which cement contains high percentage of C3S and less percentage of C2S? |
| A. | Rapid Hardening Cement |
| B. | Ordinary Portland Cement |
| C. | Quick Setting Cement |
| D. | Low Heat Cement |
| Answer» A. Rapid Hardening Cement | |
| 141. |
When concrete is to be laid under water ___________ is to used. |
| A. | Rapid Hardening Cement |
| B. | Ordinary Portland Cement |
| C. | Quick Setting Cement |
| D. | Low Heat Cement |
| Answer» C. Quick Setting Cement | |
| 142. |
Which of the following is correct for Low Heat Cement? |
| A. | Suitable for use in cold weather areas |
| B. | Heat of hydration is reduced by tri calcium aluminate content |
| C. | This cement requires longer period of curing |
| D. | This cement contains high aluminate %age usually between 35-55%. |
| Answer» B. Heat of hydration is reduced by tri calcium aluminate content | |
| 143. |
Which cement is used in sewage and water treatment plants? |
| A. | Rapid Hardening Cement |
| B. | Low Heat Cement |
| C. | Sulphate Resisting Cement |
| D. | Quick Setting Cement |
| Answer» C. Sulphate Resisting Cement | |
| 144. |
Which cement is used for mainly building construction where strength required with age? |
| A. | Rapid Hardening Cement |
| B. | Low Heat Cement |
| C. | Portland Pozzolana Cement |
| D. | Quick Setting Cement |
| Answer» C. Portland Pozzolana Cement | |
| 145. |
Which cement is used for artificial marble? |
| A. | Rapid Hardening Cement |
| B. | Sulphate Resisting Cement |
| C. | Coloured Cement |
| D. | Quick Setting Cement |
| Answer» C. Coloured Cement | |
| 146. |
Which cement is used to create bond with old concrete surface? |
| A. | Rapid Hardening Cement |
| B. | Expansive Cement |
| C. | Sulphate Resisting Cement |
| D. | Low Heat Cement |
| Answer» B. Expansive Cement | |
| 147. |
Which cement is used to store for longer duration in wet climatic conditions? |
| A. | Expansive Cement |
| B. | Ordinary Portland cement |
| C. | Hydrophobic Cement |
| D. | Quick Setting Cement |
| Answer» C. Hydrophobic Cement | |
| 148. |
Which cement is used for the construction of water-retaining structure like tanks, reservoirs, retaining walls, swimming pools, dams, bridges, piers etc? |
| A. | Waterproof Portland cement |
| B. | Colored Cement |
| C. | High Alumina Cement |
| D. | Low Heat Cement |
| Answer» A. Waterproof Portland cement | |
| 149. |
____ Cement is used for formwork that can be removed earlier and reused in other areas which save the cost of formwork. |
| A. | Rapid Hardening Cement |
| B. | Colored Cement |
| C. | High Alumina Cement |
| D. | Low Heat Cement |
| Answer» A. Rapid Hardening Cement | |
| 150. |
Which cement is mainly used for interior and exterior decorative works? |
| A. | Rapid Hardening Cement |
| B. | Colored Cement |
| C. | High Alumina Cement |
| D. | Low Heat Cement |
| Answer» B. Colored Cement | |
| 151. |
Which cement is used for works economic where considerations is predominant? Reservoirs, retaining walls, swimming pools, dams, bridges, piers etc. |
| A. | Waterproof Portland Cement |
| B. | Colored Cement |
| C. | High Alumina Cement |
| D. | Blast Furnace Slag Cement |
| Answer» D. Blast Furnace Slag Cement | |
| 152. |
How many times in each layer of concrete rodded in a slump cone? |
| A. | 75 |
| B. | 25 |
| C. | 12 to 15 |
| D. | 35 to 65 |
| Answer» B. 25 | |
| 153. |
If L1=Measurement taken after 24 hours of immersion in water at a temp. of 27 ± 20oC and L2=Measurement taken after 3 hours of immersion in water at boiling temperature. Then what is soundness of cement? |
| A. | L1+L2 |
| B. | L1/L2 |
| C. | L1-L2 |
| D. | L1*L2 |
| Answer» C. L1-L2 | |
| 154. |
Which of the following option is correct? |
| A. | Standard consistency (%) = (wt of water added/ wt of cement) *100 |
| B. | Standard consistency (%) = (wt of water added- wt of cement) *100 |
| C. | Standard consistency = (wt of water added/ wt of cement) *100 |
| D. | Standard consistency (%) = (wt cement/ wt of water) *100 |
| Answer» A. Standard consistency (%) = (wt of water added/ wt of cement) *100 | |
| 155. |
According to geological origin, aggregates is/are classified into __________ types. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 156. |
Crushed stone, gravel and ordinary sand are examples of ___________ |
| A. | Lightweight aggregate |
| B. | Normal-weight aggregate |
| C. | Heavy-weight aggregate |
| D. | Both Normal-weight aggregate and Heavy-weight aggregate |
| Answer» B. Normal-weight aggregate | |
| 157. |
Which type of aggregate is shown below? |
| A. | Angular aggregate |
| B. | Rounded aggregate |
| C. | Flaky aggregate |
| D. | Irregular or partially aggregate |
| Answer» C. Flaky aggregate | |
| 158. |
The rock which is not calcareous, is : |
| A. | lime stone |
| B. | Macl |
| C. | Chalk |
| D. | Laterite |
| Answer» D. Laterite | |
| 159. |
The main object of compaction of concrete, is: |
| A. | to eliminate air holes |
| B. | to achieve maximum density |
| C. | to provide initimate contact between the concrete and embedded materials |
| D. | all the above. |
| Answer» D. all the above. | |
| 160. |
Grading of aggregates should be continuous for |
| A. | lean |
| B. | rich |
| Answer» A. lean | |
| 161. |
The aggregates of |
| A. | irregular |
| B. | angular |
| C. | rounded |
| D. | flaky |
| Answer» B. angular | |
| 162. |
Which of the following ingredient of cement when added in excess quantity, causes the cement to set slowly? |
| A. | Lime |
| B. | silica |
| C. | alumina |
| D. | iron oxide |
| Answer» B. silica | |
| 163. |
An aggregate having all the pores filled with water but having dry surface is called |
| A. | very dry aggregate |
| B. | dry aggregate |
| C. | saturated surface dry aggregate |
| D. | moist aggregate |
| Answer» C. saturated surface dry aggregate | |
| 164. |
The internal friction between the ingredients of concrete is minimised by |
| A. | adopting coarse aggregates |
| B. | using more water |
| C. | reducing the surface area |
| D. | all of these |
| Answer» D. all of these | |
| 165. |
The light-weight concrete is prepared by |
| A. | mixing Portland cement with sawdust in specified proportion in the concrete |
| B. | using coke-breeze, cinder or slag as aggregate in the concrete |
| C. | mixing aluminium in the concrete |
| D. | none of tha above |
| Answer» B. using coke-breeze, cinder or slag as aggregate in the concrete | |
| 166. |
For compacting plain concrete or one-way reinforced concrete floors, the vibrator used is |
| A. | internal vibrator |
| B. | screed vibrator |
| C. | form vibrator |
| D. | all of these |
| Answer» B. screed vibrator | |
| 167. |
The surface moisture of aggregates increases the water-cement ratio in the mix and thus |
| A. | increases |
| B. | decreases |
| Answer» B. decreases | |
| 168. |
For compacting large sections of mass concrete in structures, the type of vibrator used is |
| A. | internal vibrator |
| B. | screed vibrator |
| C. | both (a) and (b) |
| D. | either (a) or (b) |
| Answer» A. internal vibrator | |
| 169. |
The presence of |
| A. | sodium carbonate and bicarbonate |
| B. | calcium chloride |
| C. | sodium chloride |
| D. | sodium sulphate |
| Answer» A. sodium carbonate and bicarbonate | |
| 170. |
The tetra calcium alumino ferrite in cement has |
| A. | good |
| B. | poor |
| Answer» B. poor | |
| 171. |
For reinforced concrete, the aggregate used is |
| A. | sand |
| B. | gravel |
| C. | crushed rock |
| D. | all of these |
| Answer» D. all of these | |
| 172. |
The lime concrete has |
| A. | less |
| B. | more |
| C. | same |
| Answer» A. less | |
| 173. |
The steel mould used for slump test is in the form of a |
| A. | cube |
| B. | cylinder |
| C. | frustrum of a cone |
| D. | none of these |
| Answer» C. frustrum of a cone | |
| 174. |
In order to avoid segregation, the concrete should not be thrown from a height. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 175. |
Water cement ratio may be defined as the ratio of |
| A. | volume of water to that of cement in a concrete mix |
| B. | weight of water to that of cement in a concrete mix |
| C. | volume of water to that of concrete in a concrete mix |
| D. | weight of water to that of concrete in a concrete mix |
| Answer» B. weight of water to that of cement in a concrete mix | |
| 176. |
Low heat cement contains more lime than ordinary Portland cement. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 177. |
For concreting of tunnel lining, the concrete is transported by |
| A. | pumps |
| B. | pans |
| C. | wheel barrows |
| D. | containers |
| Answer» A. pumps | |
| 178. |
For the improvement of workability of concrete, the shape of aggregate recommended is |
| A. | irregular |
| B. | angular |
| C. | round |
| D. | flaky |
| Answer» C. round | |
| 179. |
Which of the following statement is correct? |
| A. | Larger the size of coarse aggregate, lesser is the quantity of fine aggregate and of cement required. |
| B. | If very dry aggregates are used, the workability of the mix is likely to be reduced |
| C. | Bulking is caused due to the formation of thin film of surface moisture around the sand particles. |
| D. | all of the above |
| Answer» D. all of the above | |
| 180. |
For a structure subjected to the action of sea water, the cement used is |
| A. | rapid hardening cement |
| B. | low heat cement |
| C. | high alumina cement |
| D. | sulphate resisting cement |
| Answer» C. high alumina cement | |
| 181. |
For high degree of workability, the slump value should vary between |
| A. | 0 to 25 mm |
| B. | 25 to 50 mm |
| C. | 50 to 80 mm |
| D. | 80 to 100 mm |
| Answer» D. 80 to 100 mm | |
| 182. |
The term 'ware-hourse pack' means |
| A. | the total capacity of ware-house |
| B. | packing of ware-house |
| C. | pressure compaction of bags on lower layers |
| D. | pressure exertion of bags on upper layers |
| Answer» C. pressure compaction of bags on lower layers | |
| 183. |
The length of Vicat plunger in Vicat's apparatus varies from |
| A. | 20 to 30 mm |
| B. | 30 to 40 mm |
| C. | 40 to 50 mm |
| D. | 50 to 60 mm |
| Answer» C. 40 to 50 mm | |
| 184. |
The cement concrete prepared by mixing aluminium in it, is called |
| A. | air-entrained concrete |
| B. | cellular concrete |
| C. | aerated concrete |
| D. | any one of the above |
| Answer» D. any one of the above | |
| 185. |
Plain cement concrete is strong in taking |
| A. | tensile stress |
| B. | compressive stress |
| C. | shear stress |
| D. | all of these |
| Answer» B. compressive stress | |
| 186. |
As per IS : 459-1978, the concrete mixes are designated into |
| A. | 4 grades |
| B. | 5 grades |
| C. | 6 grades |
| D. | 7 grades |
| Answer» D. 7 grades | |
| 187. |
The factor which effect the quality of compaction, is |
| A. | density of concrete |
| B. | strength of concrete |
| C. | durability of concrete |
| D. | all of these |
| Answer» D. all of these | |
| 188. |
The top diameter, bottom diameter and height of the mould used for slump test are respectively |
| A. | 100 mm, 200 mm, 300 mm |
| B. | 200 mm, 100 mm, 300 mm |
| C. | 200 mm, 300 mm, 100 mm |
| D. | 100 mm, 300 mm, 200 mm |
| Answer» A. 100 mm, 200 mm, 300 mm | |
| 189. |
The aggregate which pass through 75 mm IS sieve and entirely retain on 4.75 mm IS sieve is known as |
| A. | cyclopean aggregate |
| B. | coarse aggregate |
| C. | fine aggregate |
| D. | all-in-aggregate |
| Answer» B. coarse aggregate | |
| 190. |
The rate of hydration is |
| A. | directly |
| B. | inversely |
| Answer» A. directly | |
| 191. |
Weight batching is done by |
| A. | spring dial scale |
| B. | platform weighing machine |
| C. | portable weigh batchers |
| D. | all of these |
| Answer» D. all of these | |
| 192. |
The first compound which reacts with water when mixed with cement is tricalcium aluminate. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 193. |
An aggregate which may contain some moisture in the pores but having dry surface is known as |
| A. | very dry aggregate |
| B. | dry aggregate |
| C. | saturated surface dry aggregate |
| D. | moist aggregate |
| Answer» B. dry aggregate | |
| 194. |
Proper curing of cement concrete, is good for its |
| A. | volume stability |
| B. | strength |
| C. | wear resistance |
| D. | all of these |
| Answer» D. all of these | |
| 195. |
Hydration of cement is due to the chemical action of water with |
| A. | dicalcium silicate |
| B. | tricalcium silicate |
| C. | tricalcium aluminate |
| D. | all of these |
| Answer» D. all of these | |
| 196. |
The cement concrete in which high compressive stresses are artificially induced before its actual use, is called |
| A. | plain cement concrete |
| B. | reinforced cement concrete |
| C. | prestressed cement concrete |
| D. | lime concrete |
| Answer» C. prestressed cement concrete | |
| 197. |
The fineness modulus of an aggregate is roughly proportional to |
| A. | specific gravity of the aggregate |
| B. | shape of the aggregate |
| C. | average size of particles in the aggregate |
| D. | grading of the aggregate |
| Answer» C. average size of particles in the aggregate | |
| 198. |
The water used for ordinary concrete is equal to 5% by weight of aggregate plus |
| A. | 10% |
| B. | 20% |
| C. | 30% |
| D. | 40% |
| Answer» C. 30% | |
| 199. |
Which of the following statement is wrong? |
| A. | The concrete can not be pumped. |
| B. | The concrete should have maximum creep. |
| C. | The concrete structures can be put to use immediately ater their construction. |
| D. | all of the above |
| Answer» D. all of the above | |
| 200. |
The sound absorption coefficient of light weight concrete is nearly |
| A. | twice |
| B. | three times |
| C. | four times |
| D. | six times |
| Answer» A. twice | |
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