5814 + Mcqs in Civil Engineering Page 55 McqOptions

2701.	The respective storm totals at three surrounding stations A, B and C are 110, 90 and 70 mm. If the normal annual precipitation amounts at stations X, A, B and C are respectively 1000, 1100, 1200 and 1250 mm, the estimated storm precipitation at X is
A.	75 mm
B.	77 mm
C.	79 mm
D.	81 mm.
Answer» C. 79 mm

Discussion

2702.	Concrete is unsuitable for compaction by a vibrator if it is
A.	dry
B.	earth moist
C.	semi-plastic
D.	plastic
E.	none of these.
Answer» E. none of these.

Discussion

2703.	Sands of zone I are
A.	coarse
B.	medium
C.	medium to fine
D.	fine.
Answer» B. medium

Discussion

2704.	Concrete gains strength due to
A.	chemical reaction of cement with sand and coarse aggregates
B.	evaporation of water from concrete
C.	hydration of cement
D.	All the above.
Answer» D. All the above.

Discussion

2705.	If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than
A.	20.5 mm
B.	30.5 mm
C.	40.5 mm
D.	50.5 mm
E.	none of these.
Answer» D. 50.5 mm

Discussion

2706.	Inert material of a cement concrete mix, is
A.	water
B.	cement
C.	aggregate
D.	none of these.
Answer» D. none of these.

Discussion

2707.	The factor which affects workability, is
A.	water content and its temperature
B.	shape and size of the aggregates
C.	grading and surface textures of the aggregates
D.	air entraining agents
E.	all the above.
Answer» F.

Discussion

2708.	The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as
A.	low-heat Portland cement
B.	rapid hardening Portland cement
C.	Portland blast slag cement
D.	Portland pozzolana cement
E.	none of these.
Answer» B. rapid hardening Portland cement

Discussion

2709.	Pick up the incorrect statement applicable to the field test of good cement.
A.	When one thrusts one's hand into a bag of cement, one should feel warm
B.	The colour of the cement is bluish
C.	A handful of cement thrown into a bucket of water should sink immediately
D.	By rubbing cement in between fingers, one should feed rough
E.	All the above.
Answer» F.

Discussion

2710.	According to IS : 382-1963, a good aggregate should be
A.	chemically inert
B.	sufficiently strong
C.	hard and durable
D.	all the above.
Answer» E.

Discussion

2711.	If the engineer-in-charge approves, the 10 cm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed
A.	10 cm
B.	15 cm
C.	20 cm
D.	25 cm
E.	30 cm
Answer» D. 25 cm

Discussion

2712.	The diameter of the Vicat plunger is 10 mm and its length varies from
A.	20 mm to 30 mm
B.	30 mm to 40 mm
C.	40 mm to 50 mm
D.	50 mm to 60 mm
E.	none of these.
Answer» D. 50 mm to 60 mm

Discussion

2713.	An ideal ware house, is provided
A.	water proof masonry walls
B.	water proof roof
C.	few windows which remain generally closed
D.	15 cm thick concrete floor laid on a dry course of soling
E.	all the above.
Answer» F.

Discussion

2714.	Cement used for normal concrete construction, is obtained by burning a mixture of
A.	silicious and argillaceous materials
B.	argilaceous and calcareous materials
C.	silicious and catcareous materials
D.	silicious, argillaceous and calcareous materials
E.	none of these.
Answer» E. none of these.

Discussion

2715.	The dimensions of a 35 litre forma for measuring aggregates by volume, are :
A.	length 30 cm, breadth 25 cm, height 30 cm
B.	length 39 cm, breadth 25 cm, height 32 cm
C.	length 27 cm, breadth 27 cm, height 48 cm
D.	length 220 cm, breadth 25 cm, height 40 cm
E.	none of these.
Answer» D. length 220 cm, breadth 25 cm, height 40 cm

Discussion

2716.	Higher workability of concrete is required if the structure is
A.	made with cement concrete
B.	thick and reinfored
C.	thin and heavily reinforced
D.	thick and heavily reinfored.
Answer» E.

Discussion

2717.	For a good concrete
A.	aggregates should be hard and durable
B.	cement should be sufficient to produce the required strength
C.	water should be free from organic materials
D.	mixing of ingredients should be done thoroughly so as to produce homogeneity
E.	All the above.
Answer» F.

Discussion

2718.	Gypsum is added for
A.	colour
B.	strength
C.	controlling setting time
D.	none of these.
Answer» D. none of these.

Discussion

2719.	A concrete having a slump of 6.5 cm, is said to be
A.	dry
B.	earth moist
C.	semi-plastic
D.	plastic
E.	none of these.
Answer» E. none of these.

Discussion

2720.	Ordinary Portland cement is manufactured from
A.	lime stone and clay
B.	gypsum and lime
C.	pozzolana
D.	lime, pozzolana and clay.
Answer» C. pozzolana

Discussion

2721.	Strength of concrete with passage of time
A.	increases
B.	decreases
C.	fluctuates
D.	remains constant.
Answer» B. decreases

Discussion

2722.	A flaky aggregate is said to be elongated if its length is
A.	equal to the mean size
B.	twice the mean size
C.	thrice the mean size
D.	four times the mean size
E.	five times the mean size.
Answer» C. thrice the mean size

Discussion

2723.	To prevent segregation, the maximum height for placing concrete, is
A.	100 cm
B.	125 cm
C.	150 cm
D.	200 cm
E.	250 cm
Answer» B. 125 cm

Discussion

2724.	Pozzolanic properties exist in
A.	shales
B.	fly ash
C.	pumicite
D.	diatomaceous clay
E.	all the above.
Answer» F.

Discussion

2725.	An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than
A.	22.5 mm
B.	18.5 mm
C.	16.5 mm
D.	15.5 mm
E.	13.5 mm.
Answer» F.

Discussion

2726.	Expansion joints are provided if the length of concrete structures exceeds
A.	10 m
B.	15 m
C.	15 m
D.	35 m
E.	45 m
Answer» F.

Discussion

2727.	Workability improved by adding
A.	fly ash
B.	hydrated lime
C.	calcium chloride
D.	bentonite
E.	all the above.
Answer» F.

Discussion

2728.	In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for
A.	20 times
B.	25 times
C.	30 times
D.	40 times
E.	50 times
Answer» C. 30 times

Discussion

2729.	If the average compressive strength is 4000 kg/cm2 and standard deviation is 500, the co-efficient of variation is
A.	10%
B.	12.5%
C.	15%
D.	18.5 %
E.	20%
Answer» C. 15%

Discussion

2730.	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
E.	none of these.
Answer» D. 30% by weight of aggregates plus 10% of weight of cement

Discussion

2731.	The shuttering of a hall measuring 4 m x 5 m, can be removed after
A.	5 days
B.	7 days
C.	10 days
D.	14 days
E.	21 days
Answer» C. 10 days

Discussion

2732.	If 50 kg of fine aggregates and 100 kg of coarse agregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is
A.	8 kg
B.	10 kg
C.	12 kg
D.	14 kg
E.	15 kg.
Answer» D. 14 kg

Discussion

2733.	Setting time of cement increases by adding
A.	gypsum
B.	hydrogen peroxide
C.	calcium chloride
D.	sodium oxide
E.	none of these.
Answer» B. hydrogen peroxide

Discussion

2734.	The entrained air in concrete
A.	increases workability
B.	decreases workability
C.	decreases resistance to weathering
D.	increases strength
E.	neither affects workability nor strength.
Answer» B. decreases workability

Discussion

2735.	Water cement ratio is generally expressed in volume of water required per
A.	10 kg
B.	20 kg
C.	30 kg
D.	40 kg
E.	50 kg
Answer» F.

Discussion

2736.	The strength and quality of concrete, depend upon:
A.	grading of aggregates
B.	surface area of aggregates
C.	shape of aggregates
D.	surface texture of aggregates
E.	all the above.
Answer» F.

Discussion

2737.	The concrete mix which causes difficulty in obtaining a smooth finish, possess
A.	segregation
B.	internal friction
C.	harshness
D.	bleeding
E.	none of these.
Answer» D. bleeding

Discussion

2738.	Le-Chatelier's apparatus is used for testing
A.	soundness of cement
B.	hardness of cement
C.	strength of cement
D.	durability of cement.
Answer» B. hardness of cement

Discussion

2739.	'Ware house pack' of cement means
A.	full capacity of the ware house
B.	pressure exertion of the bags of upper layers
C.	pressure compaction of the bags on lower layers
D.	packing the ware house
E.	none of these.
Answer» D. packing the ware house

Discussion

2740.	An excess of flaky particles in concrete aggregates
A.	decreases the workability
B.	increases the quantity of water and sand
C.	affects the durability of concrete
D.	more than 15% are not desirable
E.	all the above.
Answer» F.

Discussion

2741.	If the slump of a concrete mix is 60 mm, its workability is
A.	very low
B.	low
C.	medium
D.	high
E.	none of these.
Answer» D. high

Discussion

2742.	1.S.I. has specified the full strength of concrete after
A.	7 days
B.	14 days
C.	21 days
D.	28 days
E.	35 days
Answer» E. 35 days

Discussion

2743.	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.	75 minutes
E.	90 minutes.
Answer» B. 40 minutes

Discussion

2744.	Pick up the incorrect statement from the following. While performing preliminary test on concrete
A.	proportions of the material and water should be the same as to be used at the work site
B.	cement should be mixed by hand in order to maintain uniformity
C.	concrete mix should be stored in air-tight containers
D.	concrete ingredients should be kept at a temperature of 37 2 C
E.	none of these.
Answer» E. none of these.

Discussion

2745.	Sand requiring a high water cement ratio, belongs to
A.	Zone I
B.	Zone II
C.	Zone III
D.	Zone IV.
Answer» B. Zone II

Discussion

2746.	The size of fine aggregates does not exceed
A.	2.75 mm
B.	3.00 mm
C.	3.75 mm
D.	4.75 mm
E.	5.75 mm
Answer» E. 5.75 mm

Discussion

2747.	An aggregate is known as cyclopean aggregate if its size is more than
A.	4.75 mm
B.	30 mm
C.	60 mm
D.	75 mm
E.	90 mm.
Answer» E. 90 mm.

Discussion

2748.	The main object of compaction of concrete, is:
A.	to eliminate air holes
B.	to achieve maximum density
C.	to provide initimate contact between the concrete and embedded materials
D.	all the above.
Answer» E.

Discussion

2749.	For given workability the grading requiring the least amount of water is one that gives
A.	greatest surface area for the given cement and aggregates
B.	least surface area for the given cement and aggregates
C.	least weight for the given cement and aggregates
D.	greatest weight for the given cement and aggregates
E.	none of these.
Answer» B. least surface area for the given cement and aggregates

Discussion

2750.	The minimum percentage of chemical ingredient of cement is that of
A.	magnesium oxide
B.	iron oxide
C.	alumina
D.	lime
E.	silica.
Answer» B. iron oxide

Discussion

Explore topic-wise MCQs in Engineering.

The respective storm totals at three surrounding stations A, B and C are 110, 90 and 70 mm. If the normal annual precipitation amounts at stations X, A, B and C are respectively 1000, 1100, 1200 and 1250 mm, the estimated storm precipitation at X is

Concrete is unsuitable for compaction by a vibrator if it is

Sands of zone I are

Concrete gains strength due to

If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than

Inert material of a cement concrete mix, is

The factor which affects workability, is

The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as

Pick up the incorrect statement applicable to the field test of good cement.

According to IS : 382-1963, a good aggregate should be

If the engineer-in-charge approves, the 10 cm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed

The diameter of the Vicat plunger is 10 mm and its length varies from

An ideal ware house, is provided

Cement used for normal concrete construction, is obtained by burning a mixture of

The dimensions of a 35 litre forma for measuring aggregates by volume, are :

Higher workability of concrete is required if the structure is

For a good concrete

Gypsum is added for

A concrete having a slump of 6.5 cm, is said to be

Ordinary Portland cement is manufactured from

Strength of concrete with passage of time

A flaky aggregate is said to be elongated if its length is

To prevent segregation, the maximum height for placing concrete, is

Pozzolanic properties exist in

An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than

Expansion joints are provided if the length of concrete structures exceeds

Workability improved by adding

In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for

If the average compressive strength is 4000 kg/cm2 and standard deviation is 500, the co-efficient of variation is

For preparing ordinary concrete, the quantity of water used, is

The shuttering of a hall measuring 4 m x 5 m, can be removed after

If 50 kg of fine aggregates and 100 kg of coarse agregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is

Setting time of cement increases by adding

The entrained air in concrete

Water cement ratio is generally expressed in volume of water required per

The strength and quality of concrete, depend upon:

The concrete mix which causes difficulty in obtaining a smooth finish, possess

Le-Chatelier's apparatus is used for testing

'Ware house pack' of cement means

An excess of flaky particles in concrete aggregates

If the slump of a concrete mix is 60 mm, its workability is

1.S.I. has specified the full strength of concrete after

The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than

Pick up the incorrect statement from the following. While performing preliminary test on concrete

Sand requiring a high water cement ratio, belongs to

The size of fine aggregates does not exceed

An aggregate is known as cyclopean aggregate if its size is more than

The main object of compaction of concrete, is:

For given workability the grading requiring the least amount of water is one that gives

The minimum percentage of chemical ingredient of cement is that of