Test 31 - Cement Mortar Proportioning and Quantity Calculations

Question 1 ప్రశ్న 1

In the nominal proportion 1:4 for ordinary cement-sand masonry mortar under the IS 2250 proportioning concept, what do the numbers principally represent?

A One loose volume of cement to four loose volumes of sand B One kilogram of cement to four litres of water C One volume of cement to four volumes of finished hardened mortar D One bag of cement to four kilograms of sand

Question 2 ప్రశ్న 2

Why should a fixed factor such as 1.30 or 1.33 not be treated as a universal dry-material-volume multiplier for every cement mortar calculation?

A Actual mortar yield depends on materials, sand grading, moisture, packing and mixing, so any conversion factor should be stated, measured or specified for the calculation. B Dry materials and finished mortar always occupy exactly equal volumes. C Every Indian Standard requires exactly the same multiplier for all mortar mixes. D The dry-volume multiplier depends only on cement colour.

Question 3 ప్రశ్న 3

A batch requires 0.70 m³ of combined loose dry cement and sand in the proportion 1:4 by volume. Ignoring subsequent volume change, what quantities of cement and sand are required?

A 0.14 m³ cement and 0.56 m³ sand B 0.175 m³ cement and 0.525 m³ sand C 0.10 m³ cement and 0.60 m³ sand D 0.28 m³ cement and 0.42 m³ sand

Question 4 ప్రశ్న 4

A construction batch requires 1.40 m³ of combined loose dry constituents for cement mortar 1:6 by volume. What are the required loose volumes of cement and sand?

A 0.20 m³ cement and 1.20 m³ sand B 0.233 m³ cement and 1.167 m³ sand C 0.35 m³ cement and 1.05 m³ sand D 0.14 m³ cement and 1.26 m³ sand

Question 5 ప్రశ్న 5

For an estimating calculation, assume the loose bulk density of cement is 1440 kg/m³. If the calculated loose cement volume for a mortar batch is 0.150 m³, what is the corresponding cement mass?

A 180 kg B 200 kg C 216 kg D 240 kg

Question 6 ప్రశ్న 6

The 216 kg of cement calculated in the previous type of estimate corresponds to how many 50 kg bags?

A 3.32 bags B 4.00 bags C 4.32 bags D 5.32 bags

Question 7 ప్రశ్న 7

For a particular project, trials establish that 1.00 m³ of finished mortar requires 1.33 m³ of combined loose dry cement and sand. If the specified mortar is 1:4 by volume, what loose volumes of cement and sand are required per cubic metre of finished mortar?

A 0.266 m³ cement and 1.064 m³ sand B 0.333 m³ cement and 0.997 m³ sand C 0.190 m³ cement and 1.140 m³ sand D 0.443 m³ cement and 0.887 m³ sand

Question 8 ప్రశ్న 8

For another mortar system, measured data indicate that 1.00 m³ of finished mortar requires 1.28 m³ of loose dry constituents. For cement mortar 1:6, what are the approximate loose quantities of cement and sand?

A 0.160 m³ cement and 1.120 m³ sand B 0.183 m³ cement and 1.097 m³ sand C 0.213 m³ cement and 1.067 m³ sand D 0.256 m³ cement and 1.024 m³ sand

Question 9 ప్రశ్న 9

Using the quantities 0.183 m³ cement and 1.097 m³ sand calculated for a mortar batch, a project requires a 5 percent material allowance for handling losses. What approximate quantities should be allowed?

A 0.183 m³ cement and 1.097 m³ sand B 0.192 m³ cement and 1.152 m³ sand C 0.200 m³ cement and 1.200 m³ sand D 0.174 m³ cement and 1.042 m³ sand

Question 10 ప్రశ్న 10

For the same total loose dry constituent volume, by approximately what percentage does the cement volume increase when the nominal mortar proportion is changed from 1:6 to 1:4?

A 20 percent B 28.6 percent C 40 percent D 66.7 percent

Question 11 ప్రశ్న 11

A mortar batch uses three 50 kg bags of cement. Assume the loose bulk density of cement for the calculation is 1440 kg/m³. If the mortar is proportioned 1:5 by loose volume, what loose volume of sand is required?

A 0.104 m³ B 0.417 m³ C 0.521 m³ D 0.750 m³

Question 12 ప్రశ్న 12

A 1:6 cement mortar batch contains 0.72 m³ of loose dry sand. What loose cement volume and total loose constituent volume correspond to this quantity?

A 0.10 m³ cement and 0.82 m³ total B 0.12 m³ cement and 0.84 m³ total C 0.144 m³ cement and 0.864 m³ total D 0.20 m³ cement and 0.92 m³ total

Question 13 ప్రశ్న 13

A trial batch shows that 0.70 m³ of combined loose dry cement and sand produces 0.55 m³ of finished mortar. Assuming the same measured yield relationship applies, how much combined loose dry material is required for 1.00 m³ of finished mortar?

A 0.786 m³ B 1.000 m³ C 1.273 m³ D 1.550 m³

Question 14 ప్రశ్న 14

A wall area of 100 m² is to receive 12 mm thick cement plaster. Ignore openings and assume the finished mortar volume equals area × thickness. If the project specifies that loose dry materials equal 1.30 times the finished mortar volume and the mortar is 1:3, what quantities of loose cement and sand are required?

A 0.30 m³ cement and 0.90 m³ sand B 0.39 m³ cement and 1.17 m³ sand C 0.52 m³ cement and 1.04 m³ sand D 0.60 m³ cement and 0.96 m³ sand

Question 15 ప్రశ్న 15

A surface area of 50 m² requires 15 mm thick mortar. Assume no openings, a finished volume equal to area × thickness, a stated loose-dry-material factor of 1.28, and a 1:4 cement-sand proportion. What are the required loose volumes of cement and sand?

A 0.150 m³ cement and 0.600 m³ sand B 0.192 m³ cement and 0.768 m³ sand C 0.240 m³ cement and 0.720 m³ sand D 0.320 m³ cement and 0.640 m³ sand

Question 16 ప్రశ్న 16

A volumetric mortar calculation requires 0.60 m³ of dry-equivalent loose sand. Field testing shows that the damp sand has 20 percent bulking. What loose volume of the damp sand should be measured?

A 0.48 m³ B 0.60 m³ C 0.72 m³ D 0.80 m³

Question 17 ప్రశ్న 17

A mortar is intended to be proportioned 1:4 by loose volume. The cement measure is correct, but four gauge-box volumes of damp sand are used without correcting for 25 percent bulking. What is the approximate actual dry-equivalent cement:sand volume ratio?

A 1:3.2 B 1:4.0 C 1:5.0 D 1:6.25

Question 18 ప్రశ్న 18

Which statement correctly distinguishes a bulking correction from a surface-moisture correction when proportioning cement mortar?

A Bulking affects the measured loose volume of damp sand, whereas free surface moisture affects the amount of water introduced with the sand. B Both corrections refer only to cement mass. C Bulking changes cement strength grade, while surface moisture changes sand grading zone. D Neither correction matters in volumetric batching.

Question 19 ప్రశ్న 19

A mortar batch contains 600 kg of oven-dry-equivalent sand. Its total moisture content is 4.0 percent of oven-dry mass, while absorption is 1.5 percent. Assuming the aggregate pores are saturated, how much free surface water is carried by the sand?

A 9 kg B 15 kg C 24 kg D 33 kg

Question 20 ప్రశ్న 20

A mix requires 500 kg of fine aggregate in SSD condition. Available sand contains free surface moisture equal to 3 percent of its SSD mass. What wet sand mass should be batched, and how much should separately added water be reduced?

A 485 kg sand and 15 kg more water B 500 kg sand and no water correction C 515 kg sand and 15 kg less water D 530 kg sand and 30 kg less water

Question 21 ప్రశ్న 21

Two separate dry mortar batches are to be combined. Batch A contains 0.40 m³ of loose dry constituents proportioned 1:4, while Batch B contains 0.60 m³ proportioned 1:6. What are the approximate total loose volumes of cement and sand in the combined material?

A 0.166 m³ cement and 0.834 m³ sand B 0.200 m³ cement and 0.800 m³ sand C 0.240 m³ cement and 0.760 m³ sand D 0.286 m³ cement and 0.714 m³ sand

Question 22 ప్రశ్న 22

Why is it generally incorrect to assume that a 1:4 cement-sand mortar by loose volume is also a 1:4 cement-sand ratio by mass?

A Cement and sand generally have different loose bulk densities, so equal volumes do not have equal masses. B Volume and mass are always numerically identical for construction materials. C Sand has no measurable mass in the loose condition. D IS 2250 defines every volume ratio automatically as the same mass ratio.

Question 23 ప్రశ్న 23

Assume loose bulk densities of cement and dry sand are 1440 kg/m³ and 1600 kg/m³ respectively. What mass ratio of cement:sand corresponds approximately to a nominal 1:4 loose-volume mortar?

A 1:3.60 B 1:4.00 C 1:4.44 D 1:5.56

Question 24 ప్రశ్న 24

Five full 50 kg bags of cement are to be used for a 1:6 cement-sand mortar. For this calculation assume the loose bulk density of cement is 1440 kg/m³. What loose sand volume is required?

A 0.174 m³ B 0.521 m³ C 1.042 m³ D 1.440 m³

Question 25 ప్రశ్న 25

Consider the following statements about cement-mortar quantity calculations:
1. A nominal 1:6 mortar proportion under the IS 2250 guidance is interpreted on a loose-volume basis.
2. A dry-material-to-finished-mortar conversion factor should be stated or established rather than treated as a universal constant.
3. Bulking of damp sand can cause under-batching of actual sand if volumetric measurement is not corrected.
4. A 1:4 volume ratio can always be treated as a 1:4 mass ratio without knowing material bulk densities.

Which statements are correct?

A 1 and 2 only B 1, 2 and 3 only C 2, 3 and 4 only D 1, 2, 3 and 4

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