Test 15 - Ordinary Portland Cement Grades and IS Specifications

Question 1 ప్రశ్న 1

Under the current Indian Standard framework, which statement about Ordinary Portland Cement grades is correct?

A OPC 33 alone is covered by IS 269:2015, while OPC 43 and OPC 53 continue exclusively under IS 8112 and IS 12269 respectively. B IS 269:2015 consolidates requirements for OPC 33, OPC 43, OPC 53, OPC 43S and OPC 53S. C IS 269:2015 covers only Portland Pozzolana Cement. D Indian Standards no longer classify OPC according to strength grades.

Question 2 ప్రశ్న 2

Which statement correctly describes the relationship between the older OPC standards and IS 269:2015?

A The requirements formerly covered separately for 33 Grade OPC, 43 Grade OPC under IS 8112 and 53 Grade OPC under IS 12269 were consolidated into IS 269:2015. B IS 269:2015 replaced only the test method for cement colour. C IS 8112:2015 is currently the sole specification for all OPC grades. D IS 12269 now governs OPC 33, OPC 43 and OPC 53 simultaneously.

Question 3 ప్రశ్న 3

What does the number 53 in the designation 'OPC 53 Grade' principally represent?

A Exactly 53 percent clinker by mass B An initial setting time of 53 minutes C A minimum specified 28-day compressive strength of 53 MPa for standard cement mortar tested as prescribed D A minimum concrete characteristic strength of 53 MPa in every mix made with that cement

Question 4 ప్రశ్న 4

Which set correctly gives the minimum compressive strengths at approximately 3 days, 7 days and 28 days for OPC 33, OPC 43 and OPC 53 respectively under IS 269:2015?

A OPC 33: 16, 22, 33 MPa; OPC 43: 23, 33, 43 MPa; OPC 53: 27, 37, 53 MPa B OPC 33: 23, 33, 43 MPa; OPC 43: 27, 37, 53 MPa; OPC 53: 33, 43, 63 MPa C OPC 33: 16, 33, 53 MPa; OPC 43: 22, 43, 53 MPa; OPC 53: 27, 43, 63 MPa D All three grades: 27, 37 and 53 MPa

Question 5 ప్రశ్న 5

An OPC 43 cement gives standard mortar compressive strengths of 24 MPa at 3 days, 32 MPa at 7 days and 45 MPa at 28 days. Considering only these strength requirements, what is the correct assessment?

A It satisfies OPC 43 because only the 28-day strength matters. B It fails the OPC 43 strength requirements because the 7-day strength is below the specified minimum. C It automatically qualifies as OPC 53 because its 28-day strength exceeds 43 MPa. D It qualifies as OPC 43 because the average of the three strengths exceeds 33 MPa.

Question 6 ప్రశ్న 6

An OPC 53 sample has standard mortar compressive strengths of 25 MPa at 3 days, 39 MPa at 7 days and 56 MPa at 28 days. Considering only compressive-strength requirements, what is the correct conclusion?

A It complies because its 28-day strength exceeds 53 MPa. B It complies because its 7-day strength exceeds 37 MPa. C It fails because its 3-day strength is below the specified minimum for OPC 53. D It must be classified as OPC 33 without further assessment.

Question 7 ప్రశ్న 7

An OPC 43 sample develops 60 MPa compressive strength at 28 days while satisfying its minimum 3-day and 7-day requirements. Under the IS 269:2015 strength limits for OPC 43, which statement is correct?

A It necessarily complies because there is no upper 28-day strength limit for OPC 43. B It does not satisfy the OPC 43 strength requirement because the specified 28-day maximum for OPC 43 is 58 MPa. C It must automatically be marked OPC 53 without any further testing. D A 28-day strength above 43 MPa makes the 3-day and 7-day results irrelevant.

Question 8 ప్రశ్న 8

What is the minimum Blaine specific surface requirement for ordinary OPC 33, OPC 43 and OPC 53 under IS 269:2015?

A 150 m²/kg B 225 m²/kg C 320 m²/kg D 370 m²/kg

Question 9 ప్రశ్న 9

Compared with ordinary OPC 43 and OPC 53, what minimum Blaine specific surface is specified for OPC 43S and OPC 53S?

A 225 m²/kg B 300 m²/kg C 370 m²/kg D 600 m²/kg

Question 10 ప్రశ్న 10

Which statement correctly compares the Le Chatelier soundness limits for ordinary OPC and sleeper-grade OPC under IS 269:2015?

A All OPC grades have a maximum of 20 mm. B Ordinary OPC 33, 43 and 53 have a 10 mm maximum, while OPC 43S and 53S have a 5 mm maximum. C Ordinary OPC has a 5 mm maximum while sleeper grades have a 10 mm maximum. D Le Chatelier soundness is specified only for OPC 33.

Question 11 ప్రశ్న 11

What is the maximum autoclave expansion specified for the OPC grades covered by IS 269:2015?

A 0.2 percent B 0.5 percent C 0.8 percent D 2.0 percent

Question 12 ప్రశ్న 12

Which pair correctly states the setting-time requirements for ordinary OPC 33, OPC 43 and OPC 53?

A Initial setting time at least 30 minutes and final setting time not more than 600 minutes B Initial setting time at least 120 minutes and final setting time not more than 300 minutes C Initial setting time not more than 30 minutes and final setting time at least 600 minutes D Both initial and final setting times must be exactly 30 minutes

Question 13 ప్రశ్న 13

Following Amendment No. 1 to IS 269:2015, what is the minimum initial setting time for OPC 43S and OPC 53S?

A 30 minutes B 60 minutes C 90 minutes D 120 minutes

Question 14 ప్రశ్న 14

Which set correctly gives the minimum compressive strengths at approximately 3, 7 and 28 days for OPC 43S?

A 16, 22 and 33 MPa B 23, 37.5 and 43 MPa C 27, 37 and 53 MPa D 27, 37.5 and 53 MPa

Question 15 ప్రశ్న 15

Which set correctly gives the minimum compressive strengths at approximately 3, 7 and 28 days for OPC 53S?

A 23, 33 and 43 MPa B 27, 37 and 53 MPa C 27, 37.5 and 53 MPa D 33, 43 and 53 MPa

Question 16 ప్రశ్న 16

In the designations OPC 43S and OPC 53S, the suffix 'S' identifies cement specifically intended for which application?

A Sulphate-resisting masonry only B Railway concrete sleepers C Underwater grouting only D White architectural plaster

Question 17 ప్రశ్న 17

Amendment No. 1 to IS 269:2015 introduced which combination of changes specifically for OPC 43S and OPC 53S?

A SO3 maximum increased to 5 percent, C3A increased to 15 percent and initial setting time reduced to 30 minutes B SO3 maximum reduced to 3.3 percent, C3A maximum reduced to 9 percent and minimum initial setting time increased to 120 minutes C Fineness reduced to 150 m²/kg and soundness limit removed D 28-day strength requirements for both grades reduced to 33 MPa

Question 18 ప్రశ్న 18

Which statement correctly compares the maximum insoluble-residue requirement for the general and sleeper OPC grades under IS 269:2015?

A It is 5 percent for OPC 33, 43 and 53, and 2 percent for OPC 43S and 53S. B It is 2 percent for ordinary OPC and 5 percent for sleeper-grade OPC. C It is 10 percent for every grade. D Insoluble residue is not covered by the OPC specification.

Question 19 ప్రశ్న 19

A prestressed-concrete project is checking the chloride content of OPC supplied under IS 269. Which statement is the most appropriate?

A Chloride content is irrelevant to prestressed concrete. B The specification recognizes a tighter chloride limit for cement intended for prestressed structures than the general 0.1 percent limit. C Prestressed structures permit more chloride than ordinary construction because prestressing steel is unaffected by corrosion. D Cement chloride content is assessed only from its 28-day compressive strength.

Question 20 ప్రశ్న 20

Among ordinary OPC 33, OPC 43 and OPC 53, a project requires the highest specified early-age cement strength and rapid strength development, while all other design requirements are independently satisfied. Which grade provides the highest minimum 3-day and 7-day strengths?

A OPC 33 B OPC 43 C OPC 53 D All three have identical early-age requirements

Question 21 ప్రశ్న 21

A designer is selecting cement for a massive concrete foundation where control of temperature rise is the dominant durability concern. Which statement is most technically appropriate?

A Always choose OPC 33 because a lower grade number guarantees the lowest heat of hydration. B Always choose OPC 53 because higher strength automatically prevents thermal cracking. C Do not select solely from the OPC grade number; evaluate the cement type, heat-development characteristics and mass-concrete requirements. D Cement selection has no effect on temperature development in mass concrete.

Question 22 ప్రశ్న 22

Which statement correctly relates OPC grade to concrete grade?

A OPC 53 automatically produces M53 concrete irrespective of mix proportions. B OPC 43 can be used only to produce M43 concrete. C Cement grade is based on standardized mortar strength, whereas concrete grade depends on the designed concrete mixture and its characteristic compressive strength. D The numerical values of cement grade and concrete grade must always be identical.

Question 23 ప్రశ్న 23

A cement sample satisfies the 28-day minimum compressive strength for OPC 53 but fails the applicable soundness requirement. Which conclusion is correct?

A It complies as OPC 53 because strength alone determines the grade. B It complies if the manufacturer increases the grade marking to OPC 53S. C It does not conform to the complete OPC specification because all applicable requirements must be satisfied. D Soundness is optional whenever 28-day strength exceeds 53 MPa.

Question 24 ప్రశ్న 24

A standard cement-mortar cube has a loaded face of approximately 70.6 mm × 70.6 mm and fails under a compressive load of 215 kN. What is the approximate compressive stress at failure?

A 21.6 MPa B 33.0 MPa C 43.1 MPa D 53.8 MPa

Question 25 ప్రశ్న 25

Assume all non-strength requirements are satisfied. A cement has average standard-mortar compressive strengths of 28 MPa at 3 days, 38 MPa at 7 days and 55 MPa at 28 days. What is the highest general OPC grade among OPC 33, OPC 43 and OPC 53 whose minimum strength requirements are satisfied?

A OPC 33 only B OPC 43 only C OPC 53 D None of the three grades

Question 26 ప్రశ్న 26

Consider the following statements regarding the current Indian OPC specification framework:
1. IS 269:2015 covers OPC 33, OPC 43 and OPC 53.
2. IS 269:2015 also covers OPC 43S and OPC 53S for railway sleeper applications.
3. Amendment No. 1 increased the minimum initial setting time of OPC 43S and OPC 53S to 120 minutes.
4. The numerical OPC grade is identical to the characteristic strength grade of concrete made using that cement.

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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