MCQOPTIONS
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MCQOPTIONS
This section includes 185 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Addition of pozzolana to cement causes |
| A. | reduction in permeability |
| B. | loss of heat of hydration |
| C. | reduction in bleeding |
| D. | increase in curing time |
| Answer» E. | |
| 102. |
The process of hardening the concrete by keeping its surface moist is known |
| A. | placing |
| B. | wetting |
| C. | curing |
| D. | compacting |
| Answer» D. compacting | |
| 103. |
For given workability the grading requiring the least amount of water is one that gives |
| A. | greatest surface area for the given cement and aggregates |
| B. | least surface area for the given cement and aggregates |
| C. | least weight for the given cement and aggregates |
| D. | greatest weight for the given cement and aggregates |
| Answer» B. least surface area for the given cement and aggregates | |
| 104. |
For preparing a test-specimen, it is necessary |
| A. | to mix cement and fine aggregate by dry hand |
| B. | to mix coarse aggregates |
| C. | to mix water to the cement, fine aggregates and coarse aggregates |
| D. | to oil inner surface of the mould and the base plate, before placing concrete |
| Answer» E. | |
| 105. |
If the slump of a concrete mix is 60 mm, its workability is |
| A. | very low |
| B. | low |
| C. | medium |
| D. | high |
| Answer» D. high | |
| 106. |
For compacting plain concrete road surface of thickness less than 20 cm, we use |
| A. | internal vibrator |
| B. | screed vibrator |
| C. | form vibrator |
| D. | none of these. |
| Answer» C. form vibrator | |
| 107. |
If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is |
| A. | M 100 |
| B. | M 150 |
| C. | M 200 |
| D. | M 250 |
| Answer» B. M 150 | |
| 108. |
Specified compressive strengh of concrete is obtained from cube tests at the end of |
| A. | 3 days |
| B. | 7 days |
| C. | 14 days |
| D. | 21 days |
| Answer» E. | |
| 109. |
The datum temperature for maturity by Plowman, is |
| A. | 23°C |
| B. | 0° |
| C. | - 5.6°C |
| D. | - 11.7°C |
| Answer» E. | |
| 110. |
For preparing ordinary concrete, the quantity of water used, is |
| A. | 5% by weight of aggregates plus 20% of weight of cement |
| B. | 10% by weight of aggregates plus 10% of weight of cement |
| C. | 5% by weight of aggregates plus 30% of weight of cement |
| D. | 30% by weight of aggregates plus 10% of weight of cement |
| Answer» D. 30% by weight of aggregates plus 10% of weight of cement | |
| 111. |
An aggregate is said to be flaky, if its least dimension is less than |
| A. | 2/3 mean dimension |
| B. | 3/4 mean dimension |
| C. | 3/5 mean dimension |
| D. | 5/8 mean dimension |
| Answer» D. 5/8 mean dimension | |
| 112. |
Permissible compressive strength of M 200 concrete grade is |
| A. | 100 kg/cm2 |
| B. | 150 kg/cm2 |
| C. | 200 kg/cm2 |
| D. | 250 kg/cm2 |
| Answer» D. 250 kg/cm2 | |
| 113. |
High temperature |
| A. | increases the strength of concrete |
| B. | decreases the strength of concrete |
| C. | has no effect on the strength of concrete |
| D. | none of these. |
| Answer» C. has no effect on the strength of concrete | |
| 114. |
Setting time of cement increases by adding |
| A. | gypsum |
| B. | hydrogen peroxide |
| C. | calcium chloride |
| D. | sodium oxide |
| Answer» B. hydrogen peroxide | |
| 115. |
Efflorescence in cement is caused due to an excess of |
| A. | alumina |
| B. | iron oxide |
| C. | silica |
| D. | alkalis |
| Answer» E. | |
| 116. |
Non-uniform compaction may cause the concrete |
| A. | porous |
| B. | non-homogeneous |
| C. | reduced strength |
| D. | all the above. |
| Answer» E. | |
| 117. |
Ordinary Portland cement is manufactured from |
| A. | lime stone and clay |
| B. | gypsum and lime |
| C. | pozzolana |
| D. | lime, pozzolana and clay. |
| Answer» C. pozzolana | |
| 118. |
Vicat's apparatus is used for |
| A. | fineness test |
| B. | consistency test |
| C. | setting time test |
| D. | soundness test |
| Answer» C. setting time test | |
| 119. |
Segregation is responsible for |
| A. | honey-combed concrete |
| B. | porous layers in concrete |
| C. | surface scaling in concrete |
| D. | sand streaks in concrete |
| Answer» E. | |
| 120. |
Shrinkage in concrete can be reduced by using |
| A. | low water cement ratio |
| B. | less cement in the concrete |
| C. | proper concrete mix |
| D. | presaturated aggregates |
| Answer» E. | |
| 121. |
A concrete using an air entrained cement |
| A. | has strength less than 10% to 15% |
| B. | has more resistance to weathering |
| C. | is more plastic and workable |
| D. | is free from segregation and bleeding |
| Answer» D. is free from segregation and bleeding | |
| 122. |
Hardening of cement occurs at |
| A. | rapid rate during the first few days and afterwards it continues to increase at a decreased rate |
| B. | slow rate during the first few days and afterwards it continues to increase at a rapid rate |
| C. | uniform rate throughout its age |
| D. | none of these. |
| Answer» E. | |
| 123. |
The bulk density of aggregates does not depend upon : |
| A. | size and shape of aggregates |
| B. | specific gravity of aggregates |
| C. | grading of aggregates |
| D. | size and shape of the container |
| Answer» E. | |
| 124. |
Slump test of concrete is a measure ofits |
| A. | consistency |
| B. | compressive strength |
| C. | tensile strength |
| D. | impact value. |
| Answer» B. compressive strength | |
| 125. |
The cement becomes useless if its absorbed moisture content exceeds |
| A. | 0.01 |
| B. | 0.02 |
| C. | 0.03 |
| D. | 0.04 |
| Answer» E. | |
| 126. |
Curing |
| A. | reduces the shrinkage of concrete |
| B. | preserves the properties of concrete |
| C. | prevents the loss of water by evaporation |
| D. | all of the above. |
| Answer» E. | |
| 127. |
The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds |
| A. | 5 kg/cm2 |
| B. | 8 kg/cm2 |
| C. | 10 kg/cm2 |
| D. | 12 kg/cm2 |
| Answer» E. | |
| 128. |
For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is |
| A. | 0.043819444444444 |
| B. | 1 : : 3 |
| C. | 0.043101851851852 |
| D. | 0.042384259259259 |
| Answer» D. 0.042384259259259 | |
| 129. |
While compacting the concrete by a mechanical vibrator, the slump should not exceed |
| A. | 2.5 cm |
| B. | 5.0 cm |
| C. | 7.5 cm |
| D. | 10 cm |
| Answer» C. 7.5 cm | |
| 130. |
The dimensions of a 35 litre forma for measuring aggregates by volume, are : |
| A. | length 30 cm, breadth 25 cm, height 30 cm |
| B. | length 39 cm, breadth 25 cm, height 32 cm |
| C. | length 27 cm, breadth 27 cm, height 48 cm |
| D. | length 220 cm, breadth 25 cm, height 40 cm |
| Answer» D. length 220 cm, breadth 25 cm, height 40 cm | |
| 131. |
Proper proportioning of concrete, ensures |
| A. | desired strength and workability |
| B. | desired durability |
| C. | water tightness of the structure |
| D. | resistance to water |
| Answer» E. | |
| 132. |
1.S. Sieve Nos. 10 mm and 4.75 mm are geneally used for grading of |
| A. | coarse aggregates |
| B. | fine aggregates |
| C. | neither (a) nor (b) |
| D. | both (a) and (b) |
| Answer» E. | |
| 133. |
Hydration of cement is due to chemical action of water with |
| A. | Tricalcium silicate and dicalcium silicate |
| B. | Dicalcium silicate and tricalcium aluminate |
| C. | Tricalcium aluminate and tricalcium alumino ferrite |
| D. | All the above. |
| Answer» E. | |
| 134. |
The mixture of different ingredients of cement, is burnt at |
| A. | 1000°C |
| B. | 1200°C |
| C. | 1400°C |
| D. | 1600°C |
| Answer» D. 1600¬∞C | |
| 135. |
An excess of flaky particles in concrete aggregates |
| A. | decreases the workability |
| B. | increases the quantity of water and sand |
| C. | affects the durability of concrete |
| D. | more than 15% are not desirable |
| Answer» E. | |
| 136. |
Proper batching ensures |
| A. | economy |
| B. | durability |
| C. | workability |
| D. | strength |
| Answer» E. | |
| 137. |
Permissible compressive strength of M 300 concrete grade is |
| A. | 100 kg/cm2 |
| B. | 150 kg/cm2 |
| C. | 200 kg/cm2 |
| D. | 250 kg/cm2 |
| Answer» E. | |
| 138. |
Water cement ratio is |
| A. | volume of water to that of cement |
| B. | weight of water to that of cement |
| C. | weight of concrete to that of water |
| D. | volume of concrete to that of water |
| Answer» E. | |
| 139. |
Log Angles machine is used to test the aggregate for |
| A. | crushing strength |
| B. | impact value |
| C. | abrasion resistance |
| D. | water absorption |
| Answer» D. water absorption | |
| 140. |
Inert material of a cement concrete mix, is |
| A. | water |
| B. | cement |
| C. | aggregate |
| D. | none of these. |
| Answer» D. none of these. | |
| 141. |
The lower water cement ratio in concrete, introduces |
| A. | smaller creep and shrinkage |
| B. | greater density and smaller permeability |
| C. | improved frost resistance |
| D. | greater wear resistance and improved bond strength |
| Answer» E. | |
| 142. |
The factor which affects workability, is |
| A. | water content and its temperature |
| B. | shape and size of the aggregates |
| C. | grading and surface textures of the aggregates |
| D. | air entraining agents |
| Answer» E. | |
| 143. |
An aggregate is said to be flaky if its least dimension is less than |
| A. | 1/5th of mean dimension |
| B. | 2/5th of mean dimension |
| C. | 3/5th of mean dimension |
| D. | 4/5th of mean dimension |
| Answer» D. 4/5th of mean dimension | |
| 144. |
Pick up the correct proportions of chemical ingredients of cement |
| A. | Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3 |
| B. | Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3 |
| C. | Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3 |
| D. | Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3 |
| Answer» B. Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3 | |
| 145. |
M 150 grade of concrete approximates |
| A. | 1 : 3 : 6 mix |
| B. | 1 : 1 :2 mix |
| C. | 1 : 2 : 4 mix |
| D. | 1 : 1.5 : 3 mix |
| Answer» C. 1 : 2 : 4 mix | |
| 146. |
If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than |
| A. | 20.5 mm |
| B. | 30.5 mm |
| C. | 40.5 mm |
| D. | 50.5 mm |
| Answer» D. 50.5 mm | |
| 147. |
Pozzolanic properties exist in |
| A. | shales |
| B. | fly ash |
| C. | pumicite |
| D. | diatomaceous clay |
| Answer» E. | |
| 148. |
The increased cohesiveness of concrete, makes it |
| A. | less liable to segregation |
| B. | more liable to segregation |
| C. | more liable to bleeding |
| D. | more liable for surface scaling in frosty weather |
| Answer» B. more liable to segregation | |
| 149. |
Pick up the incorrect statemnt from the following. For performing compressive strength test of cement |
| A. | cement and standard sand mortar are used in the ratio of 1 : 3 |
| B. | water is added at the rate of + 3.0 percentage of water where P is the percentage of water for standard consistency |
| C. | A cube mould of 10 cm x 10 cm x 10 cm is used |
| D. | The perpared moulds are kept in a atmosphere of 50% relative humidity |
| Answer» B. water is added at the rate of + 3.0 percentage of water where P is the percentage of water for standard consistency | |
| 150. |
Construction joints are generally provided in concrete |
| A. | roads |
| B. | retaining walls |
| C. | lining of canals |
| D. | lining of tunnels |
| Answer» E. | |