Concrete Technology 50 Important Questions for SSC JE, State JE and AE

 Concrete Technology 50 Important Questions for SSC JE, State JE and AE 

Hi All! Today we are going to discuss about 50 important Concrete Technology Questions that will be very much Important for various Exams like SSC JE, Various State JE and Assistant Engineer Examination. These are the 50 important question on Concrete Technology: 

1) For quality control of Portland cement, the test essentially done is-

A. Setting time

B. Soundness

C. Tensile strength

D. consistency

E. all the above.

Ans: E) All of the Above

2) If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,

A.20%

B.25%

C.30%

D.35%

Ans: B) 25%

3) For ensuring quality of concrete, we use:

A. Single sized aggregate

B. Two sized aggregate

C. Graded aggregates

D. Coarse aggregates.

Ans: C. Graded aggregates

4. According to I.S. 456, the number of grades of concrete mixes is:

A.3

B.4

C.5

D.6

E.7

Ans: E.7

5. The mixture of different ingredients of cement, is burnt at

A.1000°C

B.1200°C

C.1400°C

D.1600°C

E.1800°C

Ans: C.1400°C

6. The risk of segregation is more for:

A. Wetter mix

B. Larger proportion of maximum size aggregate

C. Coarser Grading

D. All the above.

Ans: D. All the above.

7) After casting, an ordinary cement concrete on drying:

A. Expands

B. Mix

C. Shrinks

D. None of these.

Ans: C. Shrinks

8) Hydration of cement is due to chemical action of water with:

A. Tricalcium silicate and di-calcium silicate

B. Di-calcium silicate and tricalcium aluminate

C. Tricalcium aluminate and tricalcium aluminoferrite

D. All the above.

Ans: D. All the above.

9) To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between:

A.1100° and 1200°C

B.1200° and 1300°C

C.1300° and 1400°C

D.1400° and 1500°C

E.1500° and 1600°C

Ans: D.1400° and 1500°C

10) Permissible compressive strength of M300 concrete grade is

 A.100 kg/cm²

B.150 kg/cm²

C.200 kg/cm²

D.250 kg/cm²

E.300 kg/cm²

Ans: E.300 kg/cm²

11) The standard sand now a days used in India, is obtained from:

A. Jaipur (Rajasthan)

B. Jullundur (Punjab)

C. Hyderabad (Andhra Pradesh)

D. Ennore (Madras)

E. Cuttack (Orissa)

Ans: D. Ennore (Madras)

12) Proper proportioning of concrete, ensures:

A. Desired strength and workability

B. Desired durability

C. Water tightness of the structure

D. Resistance to water

E. All the above

Ans: E. All the above

13) Curing

A. Reduces the shrinkage of concrete

B. Preserves the properties of concrete

C. Prevents the loss of water by evaporation

D. All of the above.

Ans: D. All of the above.

14) 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

E. 15 cm

Ans: B. 5.0 cm

15) Construction joints are provided:

A. Where B.M. and S.F. are small

B. Where the member is supported by other member

C. At 18m apart in huge structures

D. In concrete wall at sill level of windows

E. All of the above.

Ans: E. All of the above

16) An aggregate is said to be flaky if its least dimension is less than:

A. 1/5th of mean dimension

B. 2/5th of mean dimension

C. 3/5th of mean dimension

D. 4/5th of mean dimension

Ans: C. 3/5th of mean dimension

17) 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. 1:2:8

E. 1:4:10

Ans: E. 1:4:10

18) The ratio of the length to breadth of a wooden float, is:

A. 4.5

B. 5.5

C. 6.5

D. 7.5

E. 8.5

Ans: B. 5.5

19) Workability improved by adding:

A. Air-entraining agent

B. Foaming agent

C. Oily-agent

D. Aluminium compound

E. All the above.

Ans: E. All the above.

20) The commonly used material in the manufacture of cement is:

A. Sand stone

B. Slate

C. Lime stone

D. Graphite

Ans: C. Lime stone

21) 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

E. 12 mm

Ans: D. 10mm

22) 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. 12 kg/cm²

E. 15 kg/cm²

Ans: E. 15 kg/cm²

23) Transport of concrete by pumps, is done for a distance of:

A. 100 m

B. 200 m

C. 300 m

D. 400 m

Ans: D. 400 m

24) Slump test is done for

A. clay

B. sand

C. lime

D. concrete

Ans: D. concrete

25) Construction joints are generally provided in concrete:

A. Roads

B. Retaining walls

C. Lining of canals

D. Lining of tunnels

E. All the above

Ans:  E. All the above

26) Vicat's apparatus is used for:

A. Fineness Test

B. Consistency Test

C. Setting time test

D. Soundness test

E. Compressive strength test.

Ans: B. Consistency Test

27) M 150 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

Ans: B. 1:1:2 mix

28) Workability of concrete is measured by:

A. Vicat apparatus test

B. Slump test

C. Minimum void method

D. Talbot Richard test.

Ans: B. Slump test

29) Ordinary concrete is not used for concrete grade:

A. M100

B. M150

C. M200

D. M250

E. M400

Ans: E. M400

30) Too wet concrete may cause:

A. Weakness of concrete

B. Excessive laitance

C. Segregation

D. Lower density

E. All the above.

Ans: E. All the above

31) Batching error means inaccuracy in the quantity of:

A. Aggregates

B. Cement

C. Water

D. All the above.

Ans: D. All the above.

32) Water required per bag of cement, is

A. 7 kg

B. 14 kg

C. 21 kg

D. 28 kg

E. 35 kg

Ans: E. 35 kg

33) ISI has specified full strength of concrete after:

A. 7 days

B. 14 days

C. 21 days

D. 28 days

E. None of these

Ans: E. None of these

34) The grade of concrete not recommended by I.S. 456, is:

A. M100

B. M200

C. M300

D. M400

E. M500

Ans: E. M500

35) 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

Ans: A. Water cement ratio

36) Workability of concrete for a given water content is good if the aggregates, are:

A. Rounded aggregate

B. Irregular aggregate

C. Angular aggregate

D. Flaky aggregates

Ans: A. Rounded aggregate

37) 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.

Ans: B. Screed vibrator

38) Specified compressive strength of concrete is obtained from cube tests at the end of:

A. 3 days

B. 7 days

C. 14 days

D. 21 days

E. 28 days

Ans: E. 28 days

39) The datum temperature for maturity by Plowman, is:

A. 23°C

B. 0°C

C. -5.6°

D. -11.7°C

Ans: D. -11.7°C

40) Slump test of concrete is a measure of its

A. Consistency

B. Compressive strength

C. Tensile strength

D. Impact value

Ans: A. Consistency

41) 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. volume of concrete to that of water

E. both (a) and (b) of the above.

Ans: E. both (a) and (b) of the above.

42) Efflorescence in cement is caused due to an excess of:

A. Alumina

B. Iron oxide

C. Silica

D. Alkalis

Ans: D. Alkalis

43) If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is:

A. 15, 900 litres

B. 16, 900 litres

C. 17, 900 litres

D. 18, 900 litres

Ans: D. 18, 900 litres

44) 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

Ans: B. Decreases the strength of concrete

45) The bulk density of aggregates, is generally expressed as:

A. Tonnes/cubic metre

B. Kg/cubic metre

C. Kg/litre

D. g/cm³

Ans: C. Kg/litre

46) Allowable shear strength of concrete, depends upon:

A. Shear strength

B. Tensile strength

C. Compressive strength

D. None of these

Ans: A. Shear strength

47) The most useless aggregate is one whose surface texture is:

A. Smooth

B. Granular

C. Glassy

D. Honey combed and porous.

Ans: C. Glassy

48) To obtain a very high strength concrete, use very fine grained:

A. Granite

B. Magnetite

C. Barite

D. Volcanic scoria.

Ans: A. Granite

49) An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S sieve No. 9, more than:

A. 5%

B. 10%

C. 15%

D. 20%

E. 25%

Ans:  B. 10%

50) The top diameter, bottom diameter and the height of a slump mould are:

A. 10 cm, 20 cm, 30 cm

B. 10 cm, 30 cm, 20 cm

C. 20 cm, 10 cm, 30 cm

D. 20 cm, 30 cm, 10 cm

E. 30 cm, 20 cm, 10 cm

Ans: A. 10 cm, 20 cm, 30 cm

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