MCQOPTIONS
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MCQOPTIONS
This section includes 143 Mcqs, each offering curated multiple-choice questions to sharpen your Concrete Technology knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The capillary-permeability test, is used to determine ___________ |
| A. | Coefficient of permeability and Capillary test |
| B. | Degree of saturation |
| C. | None of the mentioned |
| D. | All of the mentioned |
| Answer» B. Degree of saturation | |
| 102. |
The unit coefficient of permeability is ______ |
| A. | cm |
| B. | s |
| C. | cm/s |
| D. | cm/s² |
| Answer» D. cm/s² | |
| 103. |
What is the constant value of a and b in Loudon’s empirical formula “log10(KSs2) = a + bn”? |
| A. | 1 and 0 |
| B. | 1.515 and 1.365 |
| C. | 1.365 and 1.515 |
| D. | 0 and 1 |
| Answer» D. 0 and 1 | |
| 104. |
The average permeability parallel to the bedding planes is given by________ |
| A. | \(k = \frac{k_1 z_1+k_2 z_2+⋯.+k_n z_n}{z}*\frac{1}{2} \) |
| B. | \(k = \frac{1}{\frac{z_1}{k_1} +\frac{z_2}{k_2} +⋯+\frac{z_n}{k_n}} \) |
| C. | \(k = \frac{z}{\frac{z_1}{k_1} +\frac{z_2}{k_2} +⋯+\frac{z_n}{k_n}} \) |
| D. | \(k = \frac{k_1 z_1+k_2 z_2+⋯.+k_n z_n}{z} \) |
| Answer» E. | |
| 105. |
The velocity of flow of water at the centre of tube is _______ when the head is 0.1m, η=8.9*10¯³ dynes-s/cm², γw=1 g/cm³, the length is 10m and the diameter is 20cm. |
| A. | 20 cm/s |
| B. | 22 cm/s |
| C. | 28 cm/s |
| D. | 30 cm/s |
| Answer» D. 30 cm/s | |
| 106. |
Physical permeability of a soil KP is related to the coefficient of permeability by the equation ___________ |
| A. | KP=kɳ |
| B. | KP=kɳ/γW |
| C. | KP=k/ɳ |
| D. | KP=k γW |
| Answer» C. KP=k/ɳ | |
| 107. |
If the coefficient of permeability of soil is 9*10¯⁷cm/s and porosity is 0.33, then its coefficient of percolation is ______ |
| A. | 8*10¯⁷cm/s |
| B. | 27*10¯⁷cm/s |
| C. | 26*10¯⁷cm/s |
| D. | 13*10¯⁷cm/s |
| Answer» C. 26*10¯⁷cm/s | |
| 108. |
The quantity of flow for circular tube with respect to the hydraulic radius is given by ________ |
| A. | \(q=\frac{1}{2}\frac{γ_w R_H^2}{η} \) |
| B. | \(q=\frac{1}{2}\frac{γ_w R_H^2}{η}ia\) |
| C. | \(q=\frac{1}{2}\frac{γ_w R_H^2}{η}i\) |
| D. | \(q=\frac{1}{2}\frac{γ_w R_H^2}{η}a \) |
| Answer» C. \(q=\frac{1}{2}\frac{γ_w R_H^2}{η}i\) | |
| 109. |
In constant permeability test, the length of specimen is measured by ___________ |
| A. | Calculating the difference in water level |
| B. | Using Piezometric tube |
| C. | Using measuring scale |
| D. | None of the mentioned |
| Answer» C. Using measuring scale | |
| 110. |
The Remoulded specimen in Jodhpur Permeameter, can be prepared by ___________ |
| A. | Static compaction and Dynamic compaction |
| B. | Tensile compaction |
| C. | None of the mentioned |
| D. | All of the mentioned |
| Answer» B. Tensile compaction | |
| 111. |
In falling head permeability test, change in the head at a time interval dt is denoted as ___________ |
| A. | dh |
| B. | –dh |
| C. | h |
| D. | –h |
| Answer» C. h | |
| 112. |
The constant head permeability test is used for ___________ |
| A. | Fine-grained soil |
| B. | Coarse-grained soil |
| C. | Clay soil |
| D. | Saturated soil |
| Answer» C. Clay soil | |
| 113. |
The permeameter assembly is placed in ____________ of the Jodhpur permeameter apparatus. |
| A. | Bottom tank |
| B. | Top of cylinder |
| C. | Below the top plate |
| D. | None of the mentioned |
| Answer» B. Top of cylinder | |
| 114. |
If permeability at proctor’s maximum dry density is required, which of the following method can be used? |
| A. | Jodhpur mini compactor test |
| B. | Proctor test |
| C. | Compaction in permeameter |
| D. | All of the mentioned |
| Answer» E. | |
| 115. |
Which of the following tools is not used in static compaction? |
| A. | Split collar |
| B. | Perforated plate |
| C. | DRT |
| D. | Top cap |
| Answer» D. Top cap | |
| 116. |
What is the diameter of the permeameter mould (i.e. Cylinder), used in Jodhpur permeameter? |
| A. | 79.8 mm |
| B. | 50 mm |
| C. | 300 mm |
| D. | 60 mm |
| Answer» B. 50 mm | |
| 117. |
The hydraulic radius RH is related with the voids ratio as ________ |
| A. | RH=Vₛ/eAₛ |
| B. | RH=eVₛAₛ |
| C. | RH=e/AₛVₛ |
| D. | RH=eVₛ/Aₛ |
| Answer» E. | |
| 118. |
A soil deposit has three layers of soil. The permeability of the second layer is 1/2 that of the first layer and the permeability of the third layer is 1/3 that of the first layer. The thickness of each layer is equal. What will be its average permeability parallel to the bedding plane? |
| A. | 11k |
| B. | 18k |
| C. | \(\frac{11}{18}k\) |
| D. | \(\frac{18}{11}k\) |
| Answer» D. \(\frac{18}{11}k\) | |
| 119. |
What is the relationship between permeability and viscosity of water? |
| A. | Directly proportional |
| B. | Inversely proportional |
| C. | Both are equal |
| D. | None of the mentioned |
| Answer» C. Both are equal | |
| 120. |
For flow through soils, the characteristic length in Reynolds number is taken as ________ |
| A. | uniformity coefficient |
| B. | coefficient of curvature |
| C. | coefficient of percolation |
| D. | average diameter of the particles |
| Answer» C. coefficient of percolation | |
| 121. |
Coefficient of absolute permeability (K) depends on ____________ |
| A. | Permeant |
| B. | Properties of soil mass |
| C. | Degree of saturation |
| D. | All of the mentioned |
| Answer» C. Degree of saturation | |
| 122. |
In Terzaghi’s formula K = 200De2e2, De2 represents ____________ |
| A. | Effective grain shape |
| B. | Void ratio |
| C. | Effective grain size |
| D. | Permeability |
| Answer» D. Permeability | |
| 123. |
Seepage velocity is inversely proportional to hydraulic gradient. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 124. |
If the coefficient of percolation is 18*10¯⁷cm/s and void ratio is 0.5, then the coefficient of permeability k is _________ |
| A. | 26*10¯⁷cm/s |
| B. | 6*10¯⁷ cm/s |
| C. | 3*10¯⁷cm/s |
| D. | 13*10¯⁷cm/s |
| Answer» C. 3*10¯⁷cm/s | |
| 125. |
Darcy’s law describes the state of flow within individual pores. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 126. |
For flow of water in tube, the velocity at surface is ___________ |
| A. | zero |
| B. | equal to velocity at 1/3 of diameter |
| C. | equal to velocity at 1/2 of diameter |
| D. | equal to velocity at centre |
| Answer» B. equal to velocity at 1/3 of diameter | |
| 127. |
In Poiseuille’s law of flow, the variation of the velocity is given by _______ |
| A. | v = \(\frac{hγ_w}{4ηL}(r^2-R^2)\) |
| B. | v = \(\frac{hγ_w}{14ηL}(R^2-r^2)\) |
| C. | v = \(\frac{hγ_w}{4ηL}(R^2-r^2)\) |
| D. | v = \(\frac{hγ_w}{8ηL}(R^2-r^2)\) |
| Answer» D. v = \(\frac{hγ_w}{8ηL}(R^2-r^2)\) | |
| 128. |
Based on Allen Hazen experiments, permeability can be expressed as ___________ |
| A. | K=CD102 |
| B. | K=CD210 |
| C. | K=DC210 |
| D. | K=DC102 |
| Answer» B. K=CD210 | |
| 129. |
The effect of structural disturbance is on permeability is more in _____________ |
| A. | Fine-grained soil |
| B. | Coarse grained soil |
| C. | Clay soil |
| D. | All of the mentioned |
| Answer» B. Coarse grained soil | |
| 130. |
What are the types of water flow in the soil? |
| A. | Turbulent flow and Laminar flow |
| B. | Linear flow |
| C. | None of the mentioned |
| D. | All of the mentioned |
| Answer» B. Linear flow | |
| 131. |
Which of the following equation defines Darcy’s law? |
| A. | q=KA |
| B. | q=K/A |
| C. | q=K i A |
| D. | q=K i/A |
| Answer» D. q=K i/A | |
| 132. |
Gravels are __________ permeable. |
| A. | Highly |
| B. | Least |
| C. | Partially |
| D. | All of the mentioned |
| Answer» B. Least | |
| 133. |
The law of flow of water through the soil was first studied by ___________ |
| A. | Taylor |
| B. | Darcy |
| C. | Lambe |
| D. | Khosla |
| Answer» C. Lambe | |
| 134. |
In what way, do the fluid particles travel in a turbulent flow? |
| A. | Twisting |
| B. | Crossing |
| C. | Re-crossing |
| D. | Definite path |
| Answer» E. | |
| 135. |
CONCENTRATION_OF_WATER-SOLUBLE_SULPHATES_IN_WATER_____________PPM_FOR_MILD_EXPOSURE.?$ |
| A. | <150 |
| B. | 150-1500 |
| C. | 150-10000 |
| D. | >10000 |
| Answer» B. 150-1500 | |
| 136. |
Concentration_of_water-soluble_sulphates_in_water_____________ppm_for_severe_exposure.$ |
| A. | <150 |
| B. | 150-1500 |
| C. | 150-10000 |
| D. | >10000 |
| Answer» D. >10000 | |
| 137. |
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» D. Very low | |
| 138. |
For concrete exposed to a very aggressive environment the w/c should be lower than |
| A. | 1 |
| B. | .5 |
| C. | .4 |
| D. | .8 |
| Answer» D. .8 | |
| 139. |
The quality of concrete, specifically a ____________ permeability, is the best protection against sulphate attack. |
| A. | High |
| B. | Medium |
| C. | Low |
| D. | Very low |
| Answer» D. Very low | |
| 140. |
The philosophy of prescribing low ____________ cement to improve resistance to sulphate attack. |
| A. | C<sub>3</sub>S |
| B. | C<sub>3</sub>A |
| C. | C<sub>2</sub>S |
| D. | C<sub>4</sub>AF |
| Answer» C. C<sub>2</sub>S | |
| 141. |
When the ____________ content is low, most ettringite will be formed in the plastic state. |
| A. | C<sub>3</sub>SS |
| B. | C<sub>3</sub>AA |
| C. | C<sub>2</sub>S |
| D. | C<sub>4</sub>AF |
| Answer» C. C<sub>2</sub>S | |
| 142. |
Lowering of ____________ might also help, since this would reduce the amount of CH that forms. |
| A. | C<sub>3</sub>S |
| B. | C<sub>3</sub>A |
| C. | C<sub>2</sub>S |
| D. | C<sub>4</sub>AF |
| Answer» B. C<sub>3</sub>A | |
| 143. |
The addition of a pozzolanic admixture such as fly ash reduces the |
| A. | C<sub>3</sub>S |
| B. | C<sub>3</sub>A |
| C. | C<sub>2</sub>S |
| D. | C<sub>4</sub>AF |
| Answer» C. C<sub>2</sub>S | |