McqMate
| 101. |
The maximum amount of dust which may be permitted in aggregates is |
| A. | 5% of the total aggregates for low workability with a coarse grading |
| B. | 10% of the total aggregates for low workability with a fine grading |
| C. | 20% of the total aggregates for a mix having high workability with fine grading |
| D. | all the above |
| Answer» D. all the above | |
| 102. |
Bulking of sand is |
| A. | mixing of different sizes of sand particles |
| B. | mixing of lime with sand |
| C. | maximum water with sand |
| D. | swelling of sand when wetted |
| Answer» D. swelling of sand when wetted | |
| 103. |
For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than |
| A. | 15 mm |
| B. | 25 mm |
| C. | 30 mm |
| D. | 40 mm |
| Answer» D. 40 mm | |
| 104. |
Workability of concrete is measured by |
| A. | vicat apparatus test |
| B. | slump test |
| C. | minimum void method |
| D. | talbot richard test |
| Answer» B. slump test | |
| 105. |
The size of fine aggregates does not exceed |
| A. | 2.75 mm |
| B. | 3.00 mm |
| C. | 3.75 mm |
| D. | 4.75 mm |
| Answer» D. 4.75 mm | |
| 106. |
The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone |
| A. | compressive stress |
| B. | shear stress |
| C. | bond stress |
| D. | tensile stress |
| Answer» C. bond stress | |
| 107. |
The entrained air in concrete |
| A. | increases workability |
| B. | decreases workability |
| C. | decreases resistance to weathering |
| D. | increases strength |
| Answer» A. increases workability | |
| 108. |
According to IS: 4561978, the flexural strength of concrete is |
| A. | directly proportional to compressive strength |
| B. | inversely proportional to compressive strength |
| C. | directly proportional to square root of compressive strength |
| D. | inversely proportional to square root of compressive strength |
| Answer» C. directly proportional to square root of compressive strength | |
| 109. |
Slump test is done for |
| A. | clay |
| B. | sand |
| C. | lime |
| D. | concrete |
| Answer» D. concrete | |
| 110. |
Di-calcium silicate (C2S) |
| A. | hydrates rapidly |
| B. | generates less heat of hydration |
| C. | hardens rapidly |
| D. | provides less ultimate strength to cement |
| Answer» B. generates less heat of hydration | |
| 111. |
The limits of percentage p of the longitudinal reinforcement in a column is given by |
| A. | 0.15% to 2% |
| B. | 0.8% to 4% |
| C. | 0.8% to 6% |
| D. | 0.8% to 8% |
| Answer» C. 0.8% to 6% | |
| 112. |
The risk of segregation is more for |
| A. | wetter mix |
| B. | larger proportion of maximum size aggregate |
| C. | coarser grading |
| D. | all the above |
| Answer» D. all the above | |
| 113. |
Le-Chatelier's apparatus is used for testing |
| A. | soundness of cement |
| B. | hardness of cement |
| C. | strength of cement |
| D. | durability of cement |
| Answer» A. soundness of cement | |
| 114. |
Construction joints are generally provided in concrete |
| A. | roads |
| B. | retaining walls |
| C. | lining of canals |
| D. | all the above |
| Answer» D. all the above | |
| 115. |
If a grading curve is horizontal between the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve, the graded aggregates do not contain |
| A. | 20 mm particles |
| B. | 10 mm particles |
| C. | 4.75 mm particles |
| D. | all the above |
| Answer» D. all the above | |
| 116. |
Most common method of pre-stressing used for factory production is |
| A. | long line method |
| B. | freyssinet system |
| C. | magnel-blaton system |
| D. | lee-macall system |
| Answer» A. long line method | |
| 117. |
C.R.R.I. charts are used to obtain a relationship between strength of concrete and |
| A. | water cement ratio |
| B. | workability |
| C. | grading of aggregate |
| D. | fineness modulus |
| Answer» A. water cement ratio | |
| 118. |
For the design of retaining walls, the minimum factor of safety against overturning is taken as |
| A. | 1.5 |
| B. | 2.0 |
| C. | 2.5 |
| D. | 3.0 |
| Answer» B. 2.0 | |
| 119. |
If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully inundated with water is 12 cm, the bulking of the moist sand, is |
| A. | 10 % |
| B. | 12 % |
| C. | 15 % |
| D. | 25 % |
| Answer» D. 25 % | |
| 120. |
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» C. 40.5 mm | |
| 121. |
If the foundations of all the columns of a structure are designed on the total live and dead load basis, then |
| A. | there will be no settlement of columns |
| B. | there will be no differential settlement |
| C. | the settlement of exterior columns will be more than interior columns |
| D. | the settlement of interior columns will be more than exterior columns |
| Answer» C. the settlement of exterior columns will be more than interior columns | |
| 122. |
Saw dust can be rendered chemically inert by boiling it in water containing |
| A. | ferrous sulphate |
| B. | potassium chloride |
| C. | ammonia |
| D. | nitric acid |
| Answer» A. ferrous sulphate | |
| 123. |
A concrete having a slump of 6.5 cm, is said to be |
| A. | dry |
| B. | earth moist |
| C. | semi-plastic |
| D. | plastic |
| Answer» D. plastic | |
| 124. |
To obtain a very high strength concrete, use very fine grained |
| A. | granite |
| B. | magnetite |
| C. | barite |
| D. | volcanic scoria |
| Answer» A. granite | |
| 125. |
Vicat apparatus is used for |
| A. | fineness test |
| B. | consistency test |
| C. | test for setting time |
| D. | test for tensile strength |
| Answer» B. consistency test | |
| 126. |
Which of the following losses of pre-stress occurs only in pre-tensioning and not in posttensioning? |
| A. | elastic shortening of concrete |
| B. | shrinkage of concrete |
| C. | creep of concrete |
| D. | loss due to friction |
| Answer» A. elastic shortening of concrete | |
| 127. |
The type of aggregates of same nominal size, which contain less voids when compacted, are |
| A. | rounded spherical |
| B. | irregular |
| C. | flaky |
| D. | none of these |
| Answer» A. rounded spherical | |
| 128. |
Pre-stress loss due to friction occurs |
| A. | only in post-tensioned beams |
| B. | only in pre-tensioned beams |
| C. | in both post-tensioned and pre-tensioned beams |
| D. | none of the above |
| Answer» A. only in post-tensioned beams | |
| 129. |
Pick up the correct statement from the following: |
| A. | an increase in water content must be accompanied by an increase in cement content |
| B. | angular and rough aggregates reduce the workability of the concrete |
| C. | the slump of the concrete mix decreases due to an increase in temperature |
| D. | all the above |
| Answer» D. all the above | |
| 130. |
In the method of voids for determination of the quantity of cement paste, it is assumed that |
| A. | voids in coarse aggregates are filled by fine aggregates |
| B. | voids in fine aggregates are filled by the cement paste |
| C. | volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra |
| D. | all the above |
| Answer» D. all the above | |
| 131. |
As compared to ordinary Portland cement, use of pozzolana cement |
| A. | reduces workability |
| B. | increases bleeding |
| C. | increases shrinkage |
| D. | increases strength |
| Answer» C. increases shrinkage | |
| 132. |
The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary method of proportioning |
| A. | 1 : 1 : 2 |
| B. | 1 : 2 : 4 |
| C. | 1 : 3 : 6 |
| D. | 1 : 4 : 10 |
| Answer» D. 1 : 4 : 10 | |
| 133. |
The strength and quality of concrete, depend upon: |
| A. | grading of aggregates |
| B. | surface area of aggregates |
| C. | shape of aggregates |
| D. | all the above |
| Answer» D. all the above | |
| 134. |
The factor of safety for |
| A. | steel and concrete are same |
| B. | steel is lower than that for concrete |
| C. | steel is higher than that for concrete |
| D. | none of the above |
| Answer» B. steel is lower than that for concrete | |
| 135. |
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. | 15 kg/cm2 |
| Answer» D. 15 kg/cm2 | |
| 136. |
Setting time of cement increases by adding |
| A. | gypsum |
| B. | hydrogen peroxide |
| C. | calcium chloride |
| D. | sodium oxide |
| Answer» A. gypsum | |
| 137. |
According to IS: 4561978, the maximum reinforcement in a column is |
| A. | 2 % |
| B. | 4 % |
| C. | 6 % |
| D. | 8 % |
| Answer» C. 6 % | |
| 138. |
According to the recommendations of IS : 456-1978, the expansion joints |
| A. | are provided where plane changes abruptly |
| B. | are provided to ensure minimum resistance |
| C. | do not carry reinforcement across them |
| D. | all the above |
| Answer» D. all the above | |
| 139. |
The impurity of mixing water which affects the setting time and strength of concrete, is |
| A. | sodium sulphates |
| B. | sodium chlorides |
| C. | sodium carbonates and bicarbonates |
| D. | calcium bicarbonates |
| Answer» C. sodium carbonates and bicarbonates | |
| 140. |
If the size of panel in a flat slab is 6 m × 6 m, then as per Indian Standard Code, the widths of column strip and middle strip are |
| A. | 3.0 m and 1.5 m |
| B. | 1.5 m and 3.0 m |
| C. | 3.0 m and 3.0 m |
| D. | 1.5 m and 1.5 m |
| Answer» C. 3.0 m and 3.0 m | |
| 141. |
Pick up the incorrect statement from the following: |
| A. | the bottom and top ends of slump mould are parallel to each other |
| B. | the axis of the mould is perpendicular to the end faces |
| C. | the internal surface of the mould is kept clean and free from set cement |
| D. | the mould is in the form of a frustum of hexagonal pyramid |
| Answer» D. the mould is in the form of a frustum of hexagonal pyramid | |
| 142. |
The concrete mix which causes difficulty in obtaining a smooth finish, possess |
| A. | segregation |
| B. | internal friction |
| C. | hardness |
| D. | bleeding |
| Answer» C. hardness | |
| 143. |
While designing the pile as a column, the end conditions are nearly |
| A. | both ends hinged |
| B. | both ends fixed |
| C. | one end fixed and other end hinged |
| D. | one end fixed and other end free |
| Answer» C. one end fixed and other end hinged | |
| 144. |
The internal dimensions of a ware house are 15 m × 5.6 m, and the maximum height of piles is 2.70 m, the maximum number of bags to be stored in two piles, are |
| A. | 1500 bags |
| B. | 2000 bags |
| C. | 2500 bags |
| D. | 3000 bags |
| Answer» D. 3000 bags | |
| 145. |
Pick up the incorrect statement from the following. While performing preliminary test on concrete |
| A. | proportions of the material and water should be the same as to be used at the work site |
| B. | cement should be mixed by hand in order to maintain uniformity |
| C. | concrete mix should be stored in air-tight containers |
| D. | concrete ingredients should be kept at a temperature of 37° ± 2°c |
| Answer» D. concrete ingredients should be kept at a temperature of 37° ± 2°c | |
| 146. |
In a spherical dome the hoop stress due to a concentrated load at crown is |
| A. | compressive everywhere |
| B. | tensile everywhere |
| C. | partly compressive and partly tensile |
| D. | zero |
| Answer» B. tensile everywhere | |
| 147. |
I.S. Sieve Nos. 10 mm and 4.75 mm are generally used for grading of |
| A. | coarse aggregates |
| B. | fine aggregates |
| C. | neither (a) nor (b) |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 148. |
Log Angles machine is used to test the aggregate for |
| A. | crushing strength |
| B. | impact value |
| C. | abrasion resistance |
| D. | water absorption |
| Answer» C. abrasion resistance | |
| 149. |
The property of the ingredients to separate from each other while placing the concrete is called |
| A. | segregation |
| B. | compaction |
| C. | shrinkage |
| D. | bulking |
| Answer» A. segregation | |
| 150. |
Pick up the correct statement from the following: |
| A. | higher workability indicates unexpected increase in the moisture content |
| B. | higher workability indicates deficiency of sand |
| C. | if the concrete mix is dry, the slump is zero |
| D. | all the above |
| Answer» D. all the above | |
| 151. |
The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than |
| A. | 30 minutes |
| B. | 40 minutes |
| C. | 60 minutes |
| D. | 90 minutes |
| Answer» A. 30 minutes | |
| 152. |
The strength of concrete after one year as compared to 28 days strength is about |
| A. | 10 to 15% more |
| B. | 15 to 20% more |
| C. | 20 to 25% more |
| D. | 25 to 50% more |
| Answer» C. 20 to 25% more | |
| 153. |
Specified compressive strength of concrete is obtained from cube tests at the end of |
| A. | 3 days |
| B. | 7 days |
| C. | 21 days |
| D. | 28 days |
| Answer» D. 28 days | |
| 154. |
Pick up the incorrect statement from the following: |
| A. | tricalcium silicate (c3s) hydrates rapidly |
| B. | tricalcium silicate (c3s) generates more heat of hydration |
| C. | tricalcium silicate (c3s) develops early strength |
| D. | tricalcium silicate (c3s) has more resistance to sulphate attack |
| Answer» D. tricalcium silicate (c3s) has more resistance to sulphate attack | |
| 155. |
If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be |
| A. | 0.35 d |
| B. | 0.40 d |
| C. | 0.45 d |
| D. | dependent on grade of concrete also |
| Answer» B. 0.40 d | |
| 156. |
A construction joint is provided where |
| A. | bending moment is small |
| B. | shear force is small |
| C. | the member is supported by other member |
| D. | all the above |
| Answer» D. all the above | |
| 157. |
Sand generally contains salt if it is obtained from: |
| A. | nala beds |
| B. | river beds |
| C. | sea beds |
| D. | none of these |
| Answer» C. sea beds | |
| 158. |
According to IS: 4561978, minimum slenderness ratio for a short column is |
| A. | less than 12 |
| B. | less than 18 |
| C. | between 18 and 24 |
| D. | more than 24 |
| Answer» A. less than 12 | |
| 159. |
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. | both (a) and (b) of the above |
| Answer» D. both (a) and (b) of the above | |
| 160. |
For a concrete mix 1:3:6 and water cement ratio 0.6 both by weight, the quantity of water required per bag, is |
| A. | 10 kg |
| B. | 12 kg |
| C. | 14 kg |
| D. | 16 kg |
| Answer» C. 14 kg | |
| 161. |
is the span) |
| A. | l/3 |
| B. | l/5 |
| C. | l/7 |
| D. | l/10 |
| Answer» C. l/7 | |
| 162. |
Pick up the incorrect statement from the following: |
| A. | in properly graded aggregates, bulk density is more |
| B. | in single size aggregates, bulk density is least |
| C. | in single size aggregates, bulk density is maximum |
| D. | none of these |
| Answer» C. in single size aggregates, bulk density is maximum | |
| 163. |
To prevent segregation, the maximum height for placing concrete, is |
| A. | 100 cm |
| B. | 125 cm |
| C. | 150 cm |
| D. | 200 cm |
| Answer» A. 100 cm | |
| 164. |
For a simply supported beam of span 15 m, the minimum effective depth to satisfy the vertical deflection limits should be |
| A. | 600 mm |
| B. | 750 mm |
| C. | 900 mm |
| D. | more than 1 m |
| Answer» B. 750 mm | |
| 165. |
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» B. screed vibrator | |
| 166. |
Expansion joints are provided if the length of concrete structures exceeds |
| A. | 10 m |
| B. | 15 m |
| C. | 15 m |
| D. | 45 m |
| Answer» D. 45 m | |
| 167. |
The permissible diagonal tensile stress in reinforced brick work is |
| A. | about 0.1 n/mm² |
| B. | zero |
| C. | 0.3 n/mm² to 0.7 n/mm² |
| D. | about 1.0 n/mm² |
| Answer» A. about 0.1 n/mm² | |
| 168. |
Pick up the correct statement from the following: |
| A. | the concrete gains strength due to hydration of cement |
| B. | the concrete does not set at freezing point |
| C. | the strength of concrete increases with its age |
| D. | all the above |
| Answer» D. all the above | |
| 169. |
Separation of water or water sand cement from a freshly concrete, is known |
| A. | bleeding |
| B. | creeping |
| C. | segregation |
| D. | flooding |
| Answer» A. bleeding | |
| 170. |
The critical section for finding maximum bending moment for footing under masonry wall is located |
| A. | at the middle of the wall |
| B. | at the edge of the wall |
| C. | halfway between the middle and edge of the wall |
| D. | at a distance equal to effective depth of footing from the edge of the wall |
| Answer» C. halfway between the middle and edge of the wall | |
| 171. |
On a grading curve, the gap grading is represented by |
| A. | a horizontal line |
| B. | a vertical line |
| C. | n.w. inclined line |
| D. | n.e. inclined line |
| Answer» A. a horizontal line | |
| 172. |
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» B. decreases the strength of concrete | |
| 173. |
Horizontal construction joints in concrete walls are generally provided at |
| A. | soffit level |
| B. | window sill level |
| C. | floor level |
| D. | all the above |
| Answer» D. all the above | |
| 174. |
Stress strain curve of high tensile steel |
| A. | has a definite yield point |
| B. | does not show definite yield point but yield point is defined by 0.1% proof stress |
| C. | does not show definite yield point but yield point is defined by 0.2% proof stress |
| D. | does not show definite yield point but yield point is defined by 2% proof stress, |
| Answer» C. does not show definite yield point but yield point is defined by 0.2% proof stress | |
| 175. |
Addition of pozzolana to cement causes |
| A. | reduction in permeability |
| B. | loss of heat of hydration |
| C. | reduction in bleeding |
| D. | all the above |
| Answer» D. all the above | |
| 176. |
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» C. 200 kg/cm2 | |
| 177. |
The minimum diameter of longitudinal bars in a column is |
| A. | 6 mm |
| B. | 8 mm |
| C. | 12 mm |
| D. | 16 mm |
| Answer» C. 12 mm | |
| 178. |
The high strength of rapid hardening cement at early stage, is due to its |
| A. | finer grinding |
| B. | burning at high temperature |
| C. | increased lime cement |
| D. | higher content of tricalcium |
| Answer» C. increased lime cement | |
| 179. |
Sand requiring a high water cement ratio, belongs to |
| A. | zone i |
| B. | zone ii |
| C. | zone iii |
| D. | zone iv |
| Answer» A. zone i | |
| 180. |
Minimum grade of concrete to be used in reinforced concrete as per IS: 4561978 is |
| A. | m 15 |
| B. | m 20 |
| C. | m 10 |
| D. | m 25 |
| Answer» A. m 15 | |
| 181. |
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» B. 5.0 cm | |
| 182. |
Non-uniform compaction may cause the concrete |
| A. | porous |
| B. | non-homogeneous |
| C. | reduced strength |
| D. | all the above |
| Answer» D. all the above | |
| 183. |
Modulus of rupture of concrete is a measure of |
| A. | flexural tensile strength |
| B. | direct tensile strength |
| C. | compressive strength |
| D. | split tensile strength |
| Answer» A. flexural tensile strength | |
| 184. |
M10 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» A. 1 : 3 : 6 mix | |
| 185. |
Higher workability of concrete is required if the structure is |
| A. | made with cement concrete |
| B. | thick and reinforced |
| C. | thin and heavily reinforced |
| D. | thick and heavily reinforced |
| Answer» D. thick and heavily reinforced | |
| 186. |
For a cantilever of effective depth of 0.5 m, the maximum span to satisfy vertical deflection limit is |
| A. | 3.5 m |
| B. | 4 m |
| C. | 4.5 m |
| D. | 5 m |
| Answer» A. 3.5 m | |
| 187. |
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» D. size and shape of the container | |
| 188. |
How long will it take for the concrete to achieve 100% of its strength? |
| A. | 7 days |
| B. | 14 days |
| C. | 21 days |
| D. | 28 days |
| Answer» D. 28 days | |
| 189. |
A higher modular ratio shows |
| A. | higher compressive strength of concrete |
| B. | lower compressive strength of concrete |
| C. | higher tensile strength of steel |
| D. | lower tensile strength of steel |
| Answer» B. lower compressive strength of concrete | |
| 190. |
For the construction of cement concrete floor, the maximum permissible size of aggregate, is |
| A. | 4 mm |
| B. | 6 mm |
| C. | 8 mm |
| D. | 10 mm |
| Answer» D. 10 mm | |
| 191. |
The specifications of a cement bag for storage, are |
| A. | weight 50 kg |
| B. | height 18 cm |
| C. | plan area 3000 sq. cm |
| D. | all the above |
| Answer» D. all the above | |
| 192. |
The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on |
| A. | top face perpendicular to wall |
| B. | bottom face perpendicular to wall |
| C. | both top and bottom faces perpendicular to wall |
| D. | none of the above |
| Answer» A. top face perpendicular to wall | |
| 193. |
Separation of coarse aggregates from mortar during transportation, is known |
| A. | bleeding |
| B. | creeping |
| C. | segregation |
| D. | shrinkage |
| Answer» C. segregation | |
| 194. |
A flaky aggregate is said to be elongated if its length is |
| A. | equal to the mean size |
| B. | twice the mean size |
| C. | thrice the mean size |
| D. | four times the mean size |
| Answer» B. twice the mean size | |
| 195. |
You are asked to construct a massive dam, the type of cement you will use, is |
| A. | ordinary portland cement |
| B. | rapid hardening cement |
| C. | low heat cement |
| D. | blast furnace slag cement |
| Answer» C. low heat cement | |
| 196. |
An ideal ware house, is provided |
| A. | water proof masonry walls |
| B. | water proof roof |
| C. | few windows which remain generally closed |
| D. | all the above |
| Answer» D. all the above | |
| 197. |
Normally pre-stressing wires are arranged in the |
| A. | upper part of the beam |
| B. | lower part of the beam |
| C. | center |
| D. | anywhere |
| Answer» B. lower part of the beam | |
| 198. |
Pick up the correct statement from the following: |
| A. | bulking of sand is caused due to formation of a thin film of surface moisture |
| B. | fine sand bulks more than coarse sand |
| C. | the volume of fully saturated sand, is equal to the volume of dry and loose sand |
| D. | all the above |
| Answer» D. all the above | |
| 199. |
The minimum percentage of chemical ingredient of cement is that of |
| A. | magnesium oxide |
| B. | iron oxide |
| C. | alumina |
| D. | lime |
| Answer» A. magnesium oxide | |
| 200. |
Poisson's ratio for concrete |
| A. | remains constant |
| B. | increases with richer mixes |
| C. | decreases with richer mixes |
| D. | none of the above |
| Answer» B. increases with richer mixes | |
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