Test 24 - Aggregate Grading, Sieve Analysis and Fineness Modulus

Question 1 ప్రశ్న 1

Which statement correctly distinguishes the roles of IS 383 and IS 2386 (Part 1) in aggregate grading?

A IS 383 specifies grading requirements for aggregates, while IS 2386 (Part 1) provides the sieve-analysis test method used to determine particle-size distribution. B IS 383 specifies only cement strength, while IS 2386 (Part 1) specifies concrete mix proportions. C IS 383 is used only for testing aggregate impact value, while IS 2386 (Part 1) specifies cement setting time. D Both standards deal exclusively with aggregate chemical composition.

Question 2 ప్రశ్న 2

For sieve analysis of a fine aggregate, which arrangement of sieves is correct from top to bottom?

A 150 µm, 300 µm, 600 µm, 1.18 mm, 2.36 mm, 4.75 mm B 4.75 mm, 2.36 mm, 1.18 mm, 600 µm, 300 µm, 150 µm C 2.36 mm, 4.75 mm, 600 µm, 150 µm, 1.18 mm, 300 µm D 600 µm, 300 µm, 150 µm, 4.75 mm, 2.36 mm, 1.18 mm

Question 3 ప్రశ్న 3

A 1000 g aggregate sample leaves 125 g on a particular sieve. What is the percentage retained on that sieve?

A 8.0 percent B 10.0 percent C 12.5 percent D 80.0 percent

Question 4 ప్రశ్న 4

In a 1000 g sieve-analysis sample, the masses retained successively on the first three sieves are 25 g, 135 g and 240 g. What is the cumulative percentage retained at the third sieve?

A 24 percent B 40 percent C 60 percent D 75 percent

Question 5 ప్రశ్న 5

If the cumulative percentage retained on a particular sieve is 40 percent, what is the percentage passing that sieve?

A 20 percent B 40 percent C 60 percent D 140 percent

Question 6 ప్రశ్న 6

A 1000 g fine-aggregate sample gives masses retained of 20 g, 130 g, 220 g, 260 g, 210 g and 100 g on the 4.75 mm, 2.36 mm, 1.18 mm, 600 µm, 300 µm and 150 µm sieves respectively, with 60 g in the pan. What percentage passes the 600 µm sieve?

A 26 percent B 31 percent C 63 percent D 37 percent

Question 7 ప్రశ్న 7

Which expression correctly defines fineness modulus of an aggregate for a specified standard sieve series?

A Sum of cumulative percentages retained on the specified sieves divided by 100 B Sum of percentage passing on all sieves multiplied by 100 C Mass retained on the largest sieve divided by the total aggregate mass D Percentage passing the 75 µm sieve divided by the percentage retained on the 4.75 mm sieve

Question 8 ప్రశ్న 8

For a fine aggregate, the cumulative percentages retained on the 4.75 mm, 2.36 mm, 1.18 mm, 600 µm, 300 µm and 150 µm sieves are 2, 15, 37, 63, 84 and 94 respectively. What is its fineness modulus?

A 2.35 B 2.95 C 3.37 D 5.90

Question 9 ప్రశ్న 9

Fine Aggregate A has a fineness modulus of 2.40 and Fine Aggregate B has a fineness modulus of 3.10. They are blended in proportions of 65 percent A and 35 percent B by mass. What is the approximate fineness modulus of the blend?

A 2.40 B 2.51 C 2.65 D 2.88

Question 10 ప్రశ్న 10

If two fine aggregates are tested using the same standard sieve series and Aggregate X has a higher fineness modulus than Aggregate Y, what can generally be inferred?

A Aggregate X necessarily contains more clay. B Aggregate X must have a lower specific gravity. C Aggregate Y is necessarily gap graded. D Aggregate X is generally coarser overall than Aggregate Y.

Question 11 ప్రశ్న 11

Two fine aggregates have exactly the same fineness modulus. Which conclusion is technically correct?

A They must have exactly the same percentage passing every sieve. B They can have different particle-size distributions even though their fineness moduli are equal. C They must belong to the same geological source. D They necessarily produce identical concrete workability.

Question 12 ప్రశ్న 12

Under IS 383:2016, what is the percentage-passing range on the 600 µm sieve for fine aggregate belonging to Grading Zone II?

A 15 to 34 percent B 60 to 79 percent C 35 to 59 percent D 80 to 100 percent

Question 13 ప్రశ్న 13

A fine aggregate gives percentage passing values of 100, 96, 84, 70, 48, 22 and 6 on the 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 µm, 300 µm and 150 µm sieves respectively. To which IS 383 grading zone does it conform?

A Grading Zone II B Grading Zone I C Grading Zone III D Grading Zone IV

Question 14 ప్రశ్న 14

A fine aggregate gives percentage passing values of 100, 98, 90, 82, 70, 28 and 7 on the 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 µm, 300 µm and 150 µm sieves respectively. Which grading zone is the appropriate classification?

A Zone I B Zone II C Zone IV D Zone III

Question 15 ప్రశ్న 15

A fine aggregate conforms to IS 383 Grading Zone IV and is proposed for reinforced concrete. Which statement most accurately reflects the IS 383 guidance?

A Zone IV aggregate is absolutely prohibited in every form of concrete. B Its use in reinforced concrete is not recommended unless tests have established the suitability of the proposed mix proportions. C Zone IV is automatically superior to all other grading zones for reinforced concrete. D No assessment of the concrete mixture is necessary because grading has no effect on concrete.

Question 16 ప్రశ్న 16

Which statement correctly describes the IS 383 tolerance when a fine-aggregate grading falls slightly outside a grading-zone limit?

A An unlimited departure is permitted on every sieve if fineness modulus is satisfactory. B A 10 percent departure is always permitted on the 600 µm sieve. C Except for specified exclusions, departure up to 5 percent on a particular sieve may be permitted subject to a cumulative amount of 10 percent; the tolerance does not apply to the 600 µm sieve. D No grading tolerance of any kind is recognized.

Question 17 ప్రశ్న 17

For crushed stone sand, what special provision does IS 383:2016 make regarding the percentage passing the 150 µm sieve?

A The permissible limit is increased to 20 percent. B No material is permitted to pass the 150 µm sieve. C Exactly 50 percent must pass the 150 µm sieve. D The 150 µm sieve is omitted entirely from grading.

Question 18 ప్రశ్న 18

A nominal 20 mm graded coarse aggregate gives percentage passing values of 100 percent at 40 mm, 94 percent at 20 mm, 42 percent at 10 mm and 7 percent at 4.75 mm. Considering the corresponding IS 383 grading limits, what is the correct assessment?

A It fails because exactly 20 percent must pass the 10 mm sieve. B It can only be classified as fine aggregate. C It fails because no material may pass the 4.75 mm sieve. D It satisfies the listed grading requirements for 20 mm graded coarse aggregate.

Question 19 ప్రశ్న 19

Why would the aggregate in the previous question not satisfy the grading for nominal 20 mm single-sized coarse aggregate?

A Because a single-sized aggregate must have exactly one particle size. B Because 42 percent passing the 10 mm sieve and 7 percent passing the 4.75 mm sieve exceed the corresponding single-sized limits. C Because all 20 mm aggregate must pass the 150 µm sieve. D Because single-sized aggregate must contain both fine and coarse aggregate.

Question 20 ప్రశ్న 20

What is meant by a continuously graded aggregate?

A An aggregate containing a reasonably continuous distribution of particle sizes from the larger to the smaller fractions within the intended grading range B An aggregate containing only particles of one exact size C An aggregate from which all intermediate sizes are deliberately absent D An aggregate consisting exclusively of particles smaller than 150 µm

Question 21 ప్రశ్న 21

Which description most accurately characterizes gap-graded aggregate?

A Aggregate in which every possible particle size is present in equal quantity B Aggregate containing only material passing the 150 µm sieve C Aggregate in which one or more intermediate size ranges are intentionally absent or substantially deficient D Aggregate that necessarily fails every concrete specification

Question 22 ప్రశ్న 22

Why can poorly proportioned aggregate grading increase the cement-paste requirement of concrete?

A Because aggregate grading directly changes the chemical composition of cement. B Because poorly graded aggregate always has zero voids. C Because cement cannot hydrate in contact with particles of different sizes. D Because inefficient particle packing can increase void volume and the amount of paste required to fill voids and provide workable lubrication.

Question 23 ప్రశ్న 23

Which statement about an aggregate grading curve is correct?

A It commonly plots percentage passing against sieve size and reveals the particle-size distribution more completely than a single fineness-modulus value. B It plots cement setting time against concrete strength. C It can be completely reconstructed from fineness modulus alone. D It is used only to determine aggregate specific gravity.

Question 24 ప్రశ్న 24

Fine Aggregate A has 80 percent passing the 600 µm sieve, while Fine Aggregate B has 30 percent passing the same sieve. A blend contains 60 percent A and 40 percent B by mass. Assuming simple proportional blending, what percentage of the blend passes the 600 µm sieve?

A 44 percent B 60 percent C 68 percent D 110 percent

Question 25 ప్రశ్న 25

Consider the following statements about aggregate grading:
1. Percentage passing at a sieve equals 100 minus cumulative percentage retained at that sieve.
2. A higher fineness modulus generally indicates a coarser aggregate when the same sieve series is used.
3. Two aggregates having the same fineness modulus may nevertheless have different grading curves.
4. Fineness modulus alone is sufficient to prove compliance with every IS 383 grading requirement.

Which statements are correct?

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

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