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

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
by

1 Answer

Answer :

Answer: Option A
by

Related questions

The process of mixing, transporting, placing and compacting the cement, concrete should not take more than. (a) 30 minutes (b) 60minutes (c) 90 minutes (d) 120mm

Description : The process of mixing, transporting, placing and compacting the cement, concrete should not take more than. (a) 30 minutes (b) 60minutes (c) 90 minutes (d) 120mm

Last Answer : (a) 30 minutes

The process of hardening the concrete by keeping its surface moist is known (A) Placing (B) Wetting (C) Curing (D) Compacting

Description : The process of hardening the concrete by keeping its surface moist is known (A) Placing (B) Wetting (C) Curing (D) Compacting

Last Answer : Answer: Option C

The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called (A) Segregation (B) Bleeding (C) Bulking (D) Creep

Description : The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called (A) Segregation (B) Bleeding (C) Bulking (D) Creep

Last Answer : Answer: Option B

The initial setting time for ordinary Portland cement as per IS specifications should not be less than (A) 10 minutes (B) 30 minutes (C) 60 minutes (D) 600 minutes

Description : The initial setting time for ordinary Portland cement as per IS specifications should not be less than (A) 10 minutes (B) 30 minutes (C) 60 minutes (D) 600 minutes

Last Answer : Answer: Option B

High strength of concrete requires a water cement ratio of [ A ] 0.10 to 0.15 [ B ] 0.25 to 0.30 [ C ] 0.45 to 0.60 [ D ] 0.75 to 0.90

Description : High strength of concrete requires a water cement ratio of [ A ] 0.10 to 0.15 [ B ] 0.25 to 0.30 [ C ] 0.45 to 0.60 [ D ] 0.75 to 0.90

Last Answer : [ B ] 0.25 to 0.30

Addition of pozzolana to ordinary port land cement, causes (A) Decrease in early strength (B) Reduction in chemical action with sulphates (C) Increase in shrinkage (D) All the above

Description : Addition of pozzolana to ordinary port land cement, causes (A) Decrease in early strength (B) Reduction in chemical action with sulphates (C) Increase in shrinkage (D) All the above

Last Answer : Answer: Option D

Minimum required water cement ratio for a workable concrete, is (A) 0.30 (B) 0.40 (C) 0.50 (D) 0.60

Description : Minimum required water cement ratio for a workable concrete, is (A) 0.30 (B) 0.40 (C) 0.50 (D) 0.60

Last Answer : Answer: Option B

For an ordinary Portland cement (A) Residual does not exceed 10% when sieved through IS Sieve No. 9 (B) Soundness varies from 5 to 10 mm (C) Initial setting time is not less than 30 minutes (D) Compressive stress after 7 days, is not less than 175 kg/cm2

Description : For an ordinary Portland cement (A) Residual does not exceed 10% when sieved through IS Sieve No. 9 (B) Soundness varies from 5 to 10 mm (C) Initial setting time is not less than 30 minutes (D) Compressive stress after 7 days, is not less than 175 kg/cm2

Last Answer : (C) Initial setting time is not less than 30 minutes

According to IS Code , the requirement of an ordinary Portland cement is (a) The residue does not exceed 10% when sieved through is sieve no .9 (b) Its initial setting time is not less than 30 minutes. (c) its expansion is not morethan 10mm for unaerated cement (d) All the above.

Description : According to IS Code , the requirement of an ordinary Portland cement is (a) The residue does not exceed 10% when sieved through is sieve no .9 (b) Its initial setting time is not less than 30 minutes. (c) its expansion is not morethan 10mm for unaerated cement (d) All the above.

Last Answer : (d) All the above.

As per IS specifications, the maximum final setting time for ordinary Portland cement should be (A) 30 minutes (B) 1 hour (C) 6 hours (D) 10 hour

Description : As per IS specifications, the maximum final setting time for ordinary Portland cement should be (A) 30 minutes (B) 1 hour (C) 6 hours (D) 10 hour

Last Answer : Answer: Option D

Initial setting time of cement for asbestos cement products should be not less than (A) 30 minutes (B) 50 minutes (C) 75 minutes (D) 90 minutes

Description : Initial setting time of cement for asbestos cement products should be not less than (A) 30 minutes (B) 50 minutes (C) 75 minutes (D) 90 minutes

Last Answer : Answer: Option D

The normal consistency of ordinary Portland cement is about (A) 10 % (B) 20 % (C) 30 % (D) 40 %

Description : The normal consistency of ordinary Portland cement is about (A) 10 % (B) 20 % (C) 30 % (D) 40 %

Last Answer : Answer: Option C

For the construction of cement concrete dams, the maximum permissible size of the aggregates, is (A) 40 mm (B) 50 mm (C) 60 mm (D) 70 mm

Description : For the construction of cement concrete dams, the maximum permissible size of the aggregates, is (A) 40 mm (B) 50 mm (C) 60 mm (D) 70 mm

Last Answer : Answer: Option A

In case of hand mixing of concrete, the extra cement to be added is (A) 5 % (B) 10 % (C) 15 % (D) 20 %

Description : In case of hand mixing of concrete, the extra cement to be added is (A) 5 % (B) 10 % (C) 15 % (D) 20 %

Last Answer : (B) 10 %

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

Description : 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

Last Answer : Answer: Option B

For compacting plain concrete road surface of thickness less than 20 cm, the following vibrator is used. [ A ] Internal vibrator [ B ] Screed vibrator [ C ] Form vibrator [ D ] None of the above

Description : For compacting plain concrete road surface of thickness less than 20 cm, the following vibrator is used. [ A ] Internal vibrator [ B ] Screed vibrator [ C ] Form vibrator [ D ] None of the above

Last Answer : [ B ] Screed vibrator

The initial setting time of hydraulic lime, is (A) 30 minutes (B) 60 minutes (C) 90 minutes (D) 120 minutes

Description : The initial setting time of hydraulic lime, is (A) 30 minutes (B) 60 minutes (C) 90 minutes (D) 120 minutes

Last Answer : Answer: Option D

The initial setting time of lime-pozzolana, is (A) 30 minutes (B) 60 minutes (C) 90 minutes (D) 120 minutes

Description : The initial setting time of lime-pozzolana, is (A) 30 minutes (B) 60 minutes (C) 90 minutes (D) 120 minutes

Last Answer : Answer: Option D

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

Description : 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

Last Answer : Answer: Option B

For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be (A) 0.75 - 0.80 (B) 0.80 - 0.85 (C) 0.85 - 0.92 (D) Above 0.92

Description : For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be (A) 0.75 - 0.80 (B) 0.80 - 0.85 (C) 0.85 - 0.92 (D) Above 0.92

Last Answer : Answer: Option D

After casting, an ordinary cement concrete on drying (A) Expands (B) Mix (C) Shrinks (D) None of these

Description : After casting, an ordinary cement concrete on drying (A) Expands (B) Mix (C) Shrinks (D) None of these

Last Answer : (C) Shrinks

For preparing ordinary concrete, the quantity of water used, is (A) 5% by weight of aggregates plus 20% of weight of cement (B) 10% by weight of aggregates plus 10% of weight of cement (C) 5% by weight of aggregates plus 30% of weight of cement (D) 30% by weight of aggregates plus 10% of weight of cement

Description : For preparing ordinary concrete, the quantity of water used, is (A) 5% by weight of aggregates plus 20% of weight of cement (B) 10% by weight of aggregates plus 10% of weight of cement (C) ... aggregates plus 30% of weight of cement (D) 30% by weight of aggregates plus 10% of weight of cement

Last Answer : Answer: Option C

Which of the following cements is suitable for use in massive concrete structures such as large dams? (A) Ordinary Portland cement (B) Low heat cement (C) Rapid hardening cement (D) Sulphate resisting cement

Description : Which of the following cements is suitable for use in massive concrete structures such as large dams? (A) Ordinary Portland cement (B) Low heat cement (C) Rapid hardening cement (D) Sulphate resisting cement

Last Answer : Answer: Option B

For Ordinary Portland cement concrete exposed to dry and hot weather conditions, good moist curing period is [ A ] 7 days [ B ] 10 days [ C ] 14 days [ D ] None of the above

Description : For Ordinary Portland cement concrete exposed to dry and hot weather conditions, good moist curing period is [ A ] 7 days [ B ] 10 days [ C ] 14 days [ D ] None of the above

Last Answer : [ B ] 10 days

For mass concrete work, the type of cement preferable is [ A ] Ordinary Portland cement [ B ] Rapid hardening cement [ C ] Low heat cement [ D ] Blast furnace slag cement

Description : For mass concrete work, the type of cement preferable is [ A ] Ordinary Portland cement [ B ] Rapid hardening cement [ C ] Low heat cement [ D ] Blast furnace slag cement

Last Answer : [ C ] Low heat cement

The removal of excess air after placing concrete helps in increasing the strength of concrete by (a) 15 to 20% (b) 20 to 30% (c) 30 to 50% (d) 50 to 70%

Description : The removal of excess air after placing concrete helps in increasing the strength of concrete by (a) 15 to 20% (b) 20 to 30% (c) 30 to 50% (d) 50 to 70%

Last Answer : (a) 15 to 20%

Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is (A) 30 % (B) 40 % (C) 50 % (D) 60 %

Description : Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is (A) 30 % (B) 40 % (C) 50 % (D) 60 %

Last Answer : (A) 30 %

If water required for 1 bag of cement is 30 litres, the water cement ratio is: (A) 0.40 (B) 0.50 (C) 0.60 (D) None of these

Description : If water required for 1 bag of cement is 30 litres, the water cement ratio is: (A) 0.40 (B) 0.50 (C) 0.60 (D) None of these

Last Answer : Answer: Option C

The heat generated in ordinary cement at the end of 3 days is about [ A ] 60 cal/g [ B ] 80 cal/g [ C ] 100 cal/g [ D ] 120 cal/g

Description : The heat generated in ordinary cement at the end of 3 days is about [ A ] 60 cal/g [ B ] 80 cal/g [ C ] 100 cal/g [ D ] 120 cal/g

Last Answer : [ B ] 80 cal/g

The process of keeping concrete moist for a certain period after its finishing, is known as (A) Finishing of concrete (B) Curing of concrete (C) Placing of concrete (D) Compaction of concrete

Description : The process of keeping concrete moist for a certain period after its finishing, is known as (A) Finishing of concrete (B) Curing of concrete (C) Placing of concrete (D) Compaction of concrete

Last Answer : Answer: Option B

The process of consolidating concrete mix after placing it in position is termed as. (a) Curing (b) Wetting (c) Compaction (d) All of these

Description : The process of consolidating concrete mix after placing it in position is termed as. (a) Curing (b) Wetting (c) Compaction (d) All of these

Last Answer : (c) Compaction

For 100 sq. m cement concrete (1 : 2: 4) 4 cm thick floor, the quantity of cement required, is (A) 0.90 m3 (B) 0.94 m3 (C) 0.98 m3 (D) 1.00 m3

Description : For 100 sq. m cement concrete (1 : 2: 4) 4 cm thick floor, the quantity of cement required, is (A) 0.90 m3 (B) 0.94 m3 (C) 0.98 m3 (D) 1.00 m3

Last Answer : (B) 0.94 m3

Ordinary concrete is not used for concrete grade (A) M 100 (B) M 150 (C) M 250 (D) M 40

Description : Ordinary concrete is not used for concrete grade (A) M 100 (B) M 150 (C) M 250 (D) M 40

Last Answer : (D) M 400

At 160°C, it takes about minutes to kilt bacterial spores in a hot-air oven. a. 30 b. 60 c. 90 d. 120

Description : At 160°C, it takes about minutes to kilt bacterial spores in a hot-air oven. a. 30 b. 60 c. 90 d. 120

Last Answer : d. 120

Define the following special types of concretes with its one use. i) Vacuum concrete ii) Fiber reinforced concrete iii) High performance concrete iv) Self-compacting concrete

Description : Define the following special types of concretes with its one use. i) Vacuum concrete ii) Fiber reinforced concrete iii) High performance concrete iv) Self-compacting concrete

Last Answer : The uses of special types of concretes are as follows.  i) Vacuum concrete: It is the concrete in which entrained air and excess water form concrete mix is taken out from vacuum pump, ... . large bridge and machine foundations iii. Pumped concrete for floors and slabs. iv. Pre-stressed concrete

Pick up the correct statement from the following: (A) Cement should be mixed for at least one minute (B) 10% of water is placed in the rotating drum before adding dry material (C) 10% of water is added after placing the other ingredients in the drum (D) All the above

Description : Pick up the correct statement from the following: (A) Cement should be mixed for at least one minute (B) 10% of water is placed in the rotating drum before adding dry material (C) 10% of water is added after placing the other ingredients in the drum (D) All the above

Last Answer : Answer: Option D

Under normal conditions using an ordinary cement, the period of removal of the form work, is: (A) 7 days for beam soffits (B) 14 days for bottom slabs of spans 4.6 m and more (C) 21 days for bottom beams over 6 m spans (D) All the above

Description : Under normal conditions using an ordinary cement, the period of removal of the form work, is: (A) 7 days for beam soffits (B) 14 days for bottom slabs of spans 4.6 m and more (C) 21 days for bottom beams over 6 m spans (D) All the above

Last Answer : Answer: Option D

The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known (A) Grading (B) Curing (C) Mixing (D) Batching

Description : The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known (A) Grading (B) Curing (C) Mixing (D) Batching

Last Answer : (D) Batching

The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known as [ A ] Curing [ B ] Mixing [ C ] Grading [ D ] Batching

Description : The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known as [ A ] Curing [ B ] Mixing [ C ] Grading [ D ] Batching

Last Answer : [ D ] Batching

The desirable camber for straight cement concrete roads, is (A) 1 in 33 to 1 in 25 (B) 1 in 40 to 1 in 33 (C) 1 in 150 to 1 in 140 (D) 1 in 160 to 1 in 140

Description : The desirable camber for straight cement concrete roads, is (A) 1 in 33 to 1 in 25 (B) 1 in 40 to 1 in 33 (C) 1 in 150 to 1 in 140 (D) 1 in 160 to 1 in 140

Last Answer : Answer: Option D

The tensile strength of concrete is given by [ A ] 0.45 vfCK [ B ] 0.60 vfCK [ C ] 0.70 vfCK [ D ] 0.90 vfCK

Description : The tensile strength of concrete is given by [ A ] 0.45 vfCK [ B ] 0.60 vfCK [ C ] 0.70 vfCK [ D ] 0.90 vfCK

Last Answer : [ C ] 0.70 vfCK

At 28 days of curing concrete attains a strength of [ A ] 20 to 25% [ B ] 60 to 70% [ C ] 65 to 80% [ D ] 90 to 95%

Description : At 28 days of curing concrete attains a strength of [ A ] 20 to 25% [ B ] 60 to 70% [ C ] 65 to 80% [ D ] 90 to 95%

Last Answer : [ D ] 90 to 95%

For the supply of materials for concrete, form work reinforcing and placing of concrete, removal of form work and curing of concrete, number of bar(s) required on bar chart, is (A) 1 (B) 2 (C) 3 (D) 4

Description : For the supply of materials for concrete, form work reinforcing and placing of concrete, removal of form work and curing of concrete, number of bar(s) required on bar chart, is (A) 1 (B) 2 (C) 3 (D) 4

Last Answer : (A) 1

Consider the following operations: 1. Drilling 2. Blasting 3. Mucking 4. Placing steel 5. Placing concrete The correct sequence of these operations in tunnel construction is (A) 1, 2, 4, 3, 5 (B) 1, 3, 2, 4, 5 (C) 1, 2, 3, 4, 5 (D) 1, 3, 4, 2,

Description : Consider the following operations: 1. Drilling 2. Blasting 3. Mucking 4. Placing steel 5. Placing concrete The correct sequence of these operations in tunnel construction is (A) 1, 2, 4, 3, 5 (B) 1, 3, 2, 4, 5 (C) 1, 2, 3, 4, 5 (D) 1, 3, 4, 2,

Last Answer : (C) 1, 2, 3, 4, 5

To prevent segregation, the maximum height for placing concrete, is (A) 100 cm (B) 125 cm (C) 150 cm (D) 200 cm

Description : To prevent segregation, the maximum height for placing concrete, is (A) 100 cm (B) 125 cm (C) 150 cm (D) 200 cm

Last Answer : Answer: Option A

The property of the ingredients to separate from each other while placing the concrete is called (A) Segregation (B) Compaction (C) Shrinkage (D) Bulking

Description : The property of the ingredients to separate from each other while placing the concrete is called (A) Segregation (B) Compaction (C) Shrinkage (D) Bulking

Last Answer : Answer: Option A

While placing of concrete the thickness of each layer for R.C.C. is [ A ] 150 to 300 mm [ B ] 450 mm [ C ] 500 to 750 mm [ D ] 500 mm

Description : While placing of concrete the thickness of each layer for R.C.C. is [ A ] 150 to 300 mm [ B ] 450 mm [ C ] 500 to 750 mm [ D ] 500 mm

Last Answer : [ A ] 150 to 300 mm

The percentage of the calcium eliminated in feces is (A) 10–20 (B) 30–40 (C) 50–60 (D) 70–90

Description : The percentage of the calcium eliminated in feces is (A) 10–20 (B) 30–40 (C) 50–60 (D) 70–90

Last Answer : Answer : D

Octane number of petrol normally used in petrol engines is of the order of a. 20-30 b. 40-60 c. 60-70 d. 80-90

Description : Octane number of petrol normally used in petrol engines is of the order of a. 20-30 b. 40-60 c. 60-70 d. 80-90

Last Answer : ANSWER d. 80-90

For the irreversible reaction, Ca+ 2C = Ca C2, Δ H°298 = - 60000 J . mole-1. If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be (A) 30,000 J (B) 60,000 J (C) 90,000 J (D) 2,40,000 J

Description : For the irreversible reaction, Ca+ 2C = Ca C2, Δ H°298 = - 60000 J . mole-1. If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved ... will be (A) 30,000 J (B) 60,000 J (C) 90,000 J (D) 2,40,000 J

Last Answer : (C) 90,000 J