Building Materials MCQ Civil Engineering Questions Answers

11) The sand in mortar

(a) prevents shrinkage

(b) spreads mortar

(c) allows carbon dioxide from the atmosphere to penetrate deeply

(d) all the above

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Option – d)

12) The approximate proportion of dry cement mortar required for brickwork is

a) 60%

b) 45%

c) 30%

d) 10%

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Option – c)

13) The compound responsible for initial setting of cement is

(a) Tricalcium aluminate

(b) Tricalcium silicate

(c) Dicalcium silicate

(d) Tetra alumino ferrite

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Option – a)

14) Plaster of paris is obtained by calcining

a) gypsum

b) bauxite

c) lime stone

d) kanker

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Option – a)

15) The fuel generally used for burning lime stone is

(a) firewood

(b) charcoal

(c) coal

(d) any one of these

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Option – a)

16) Initial setting time of concrete ceases at

a) -100C

b) -40C

c) 00C

d) 40C

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Option – c)

17) Which one of the following statement is correct?

(a) Fat lime contains hardly 5% clay

(b) Hydraulic lime contains 5.30% clay

(c) Poor lime contains more than 30% clay

(d) All the above

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Option – a)

18) Which one of the following does not react with concrete ?

a) Sewage water

b) Sulphuric acid

c) Vegetable oil

d) Alcohol

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Option – d)

19) The heaviest metal is

(a) steel

(b) lead

(c) tin

(d) cast iron

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Option – b)

20) For a RCC slab the slump of concrete should be

a) 0-25 mm

b) 25-50 mm

c) 75-100 mm

d) 50-125 mm

View Answer
Option – c)