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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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