Construction Materials & Management Test 1

Question 1
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If D is the duration, ES and EF are the earliest start time and earliest finish time, LS and LF are the latest start time and latest finish time, then the following relation(s) hold(s) good :
A. EF = ES + D
B. LS = LF – D
C. D = EF – ES
Select the code for the correct answer from the options given below :

A
A and C only

B
A and B only

C
C only

D
A,B,C

Question 2
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Purchasing cost of a new machine is 8 Lacs. Salvage value after expected life of 3 year is 1 Lacs. The rate of depreciation using constant rate of declining balance method is

A
0.25

B
0.30c

C
0.40

D
0.50

Question 3
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Let the characteristic strength be defined as that value, below which not more than 50% of the results are expected to fall. Assuming a standard deviation of 4 MPa, the target mean strength (in MPa) to be considered in the mix design of a M25 concrete would be

A
18.42

B
21.00

C
25.00

D
31.58

Question 4
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Which of the following statements are true

A
Tests on cement paste to determine initial and final setting times are done at normal consistency condition.

B
Low heat cement has a Low percentage of tri-calcium aluminate.

C
High early strength Portland cement contains a larger percentage of tri-calcium silicate and a lower percentage of di-calcium silicate.

D
High early strength Portland cement contains a larger percentage of di-calcium silicate and a lower percentage of tri-calcium silicate.

Question 5
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What is carbon content (%) in mild steel?

A
2.0 – 3.0

B
0.5 – 0.8

C
0.05 – 0.1

D
0.15 – 0.3

Question 6
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Consider the following data for concrete with mild exposure:
Water-cement ratio = 0.50
Water = 191.6 litre
The required cement content will be

A
561 kg/m³

B
472 kg/m³

C
383 kg/m³

D
294 kg/m³

Question 7
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If creep coefficient for concrete at 7 days is k₁ and at 28 days is k₂ then

A
k₁ > k₂

B
k₁ < k₂

C
k₁ = k₂

D
k₁ ≤ k₂

Question 8
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In the manufacture of cement definite proportions of argillaceous and calcareous materials are burnt at a temperature of

A
425°C

B
875°C

C
1450°C

D
1650°C

Question 9
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Which of the following sentences is CORRECT in the case of cement?

A
Excess of sulphur trioxide will cause unsoundness in cement

B
Alumina is responsible for false set

C
Felite has highest rate of hydration

D
C-S-H gel also known as singenite gel

Question 10
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The percentage of gypsum added to the clinker during manufacturing process is

A
0.2

B
0.25 to 0.35

C
2.5 to 3.5

D
5 to 10

Question 11
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The salvage value of any equipment is Rs.1000 and after five years of its use, its book value after two years of its useful life is Rs.6400. The original cost of the equipment is

A
5000

B
7000

C
9000

D
10000

Question 12
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Which system of network given below completely eliminates the use of dummy activities?

A
A – O – A (Activity – on - Arrow)

B
A – O – N (Activity – on - Node)

C
PERT

D
CPM

Question 13
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The setting and hardening of cement after addition of water is due to

A
the presence of gypsum

B
binding action of water

C
hydration of some of the constituent compounds of cement

D
evaporation of water

Question 14
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Consider the following forms of water in a hydrated cement paste:
1. Capillary water
2. Chemically combined water
3. Interlayer water
4. Adsorbed water
Which of the above forms of water will on its/their removal, cause shrinkage of the paste?

A
1, 2 and 3

B
1, 2 and 4

C
2, 3 and 4

D
1, 3 and 4

Question 15
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The tricalcium aluminate compound present in cement

A
provides weak resistance against sulphate attack

B
is responsible for highest heat of evolution

C
characteristically fast reacting with water

D
All of the above

Question 16
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For increasing the workability of concrete, it is necessary to

1. Increase the quantity of Sand

2. Decrease the quantity of sand

3. Use Rounded aggregate

4. Alter the proportion of fine and coarse aggregates

Which of the following statements are correct

A
All statements are true

B
Both Statement 2 and 4

C
Statement 3

D
Both Statement 2 and 3

Question 17
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The contribution compounds of cement in decreasing order of rate of hydration are

A
C₂S, C₃S and C₃A

B
C₃S, C₃A and C₂S

C
C₃A C₃S, and C₂S

D
C₃A, C₂S and C₃S

Question 18
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The time estimates in days are obtained from four contractors P, Q, R, S for executing a particular job are as under
Contractor
Optimistic time
(t₀)
Most likely time
(t_m)
Pessimistic time
(t_P)
P
5
10
13
Q
6
9
12
R
5
10
14
S
4
10
13

A
Contractor Q is more certain about completing the project in time.

B
Contractor P is more certain about completing the project in time.

C
Expected Completion time by Contractor P is 9.67 days

D
Expected Completion time by Contractor Q is 9 days

Question 19
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When water is added to the cement

A
chemical reaction starts

B
heat is generated

C
both a and b

D
impurities are washed out

Question 20
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Initial setting time is maximum for

A
portland-pozzolana cement

B
portland-slag cement

C
low-heat portland-pozzolana cement

D
high strength portland cement

Question 21
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A construction equipment was purchased in Rs. 12000. Assuming its salvage value at the end of 6 years to be Rs. 3000, and annual sinking percentage is 4%. Determine the difference of the amount of depreciation (in rupees) determined by straight-line method and sinking fund method for each year.

A
143-144

B
1434-1441

C
1437-1446

D
1439-1442

Question 22

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Match the following:

A)	Cost plus percentage rate contract	i)	Unit Price contract
B)	Labour contract	ii)	Above or below percent
C)	Percentage Rate contract	iii)	Actual cost plus added percentage
D)	Item Rate contract	iv)	Labour cost excluding materials

A – (iii) B – (i) C – (iv) D – (iii)

A – (iii) B – (ii) C – (i) D – (iv)

A – (iii) B – (iv) C – (ii) D – (i)

B – (iv) A – (iii) C – (ii) D – (i)

Question 23
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A PERT network diagram in the form of a line diagram with optimistic time, pessimistic time and most likely time of the activity are given below in the table:
Activity Optimistic Time Pessimistic Time Most Likely Time
P - Q 4 10 7
Q - R 6 10 8
R - S 9 15 15
S - T 8 11 8

All the data in the table are in days. The Probable range of total duration will be

A
34.2 to 46.2

B
32.6 to 42.4

C
34.8 to 45.8

D
32.4 to 44.5

Question 24
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In medium-strength concrete the water-cement ratio should not be less than

A
0.25

B
0.35

C
0.4

D
0.45

Question 25
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By using a mix design procedure, mix proportions for the desired grade of concrete have been obtained as 1 : 2.2 : 3.6 (by mass) with water cement ratio of 0.55. To make 0.40 m³ of concrete the weight of cement required is ______kg.
Assume air content to be 0% and specific gravity of cement, sand and aggregate were 3.15, 2.65 and 2.7 respectively.

A
131-133

B
1314-1331

C
1317-1336

D
1319-1332

Submit Test

Contractor	Optimistic time (t₀)	Most likely time (t_m)	Pessimistic time (t_P)
P	5	10	13
Q	6	9	12
R	5	10	14
S	4	10	13

Activity	Optimistic Time	Pessimistic Time	Most Likely Time
P - Q	4	10	7
Q - R	6	10	8
R - S	9	15	15
S - T	8	11	8

Construction Ma...

Question 1

A and C only

A and B only

C only

A,B,C

Question 2

0.25

0.30c

0.40

0.50

Question 3

18.42

21.00

25.00

31.58

Question 4

Tests on cement paste to determine initial and final setting times are done at normal consistency condition.

Low heat cement has a Low percentage of tri-calcium aluminate.

High early strength Portland cement contains a larger percentage of tri-calcium silicate and a lower percentage of di-calcium silicate.

High early strength Portland cement contains a larger percentage of di-calcium silicate and a lower percentage of tri-calcium silicate.

Question 5

2.0 – 3.0

0.5 – 0.8

0.05 – 0.1

0.15 – 0.3

Question 6

561 kg/m3

472 kg/m3

383 kg/m3

294 kg/m3

Question 7

k1 > k2

k1 < k2

k1 = k2

k1 ≤ k2

Question 8

425°C

875°C

1450°C

1650°C

Question 9

Excess of sulphur trioxide will cause unsoundness in cement

Alumina is responsible for false set

Felite has highest rate of hydration

C-S-H gel also known as singenite gel

Question 10

0.2

0.25 to 0.35

2.5 to 3.5

5 to 10

Question 11

5000

7000

9000

10000

Question 12

A – O – A (Activity – on - Arrow)

A – O – N (Activity – on - Node)

PERT

CPM

Question 13

the presence of gypsum

binding action of water

hydration of some of the constituent compounds of cement

evaporation of water

Question 14

1, 2 and 3

1, 2 and 4

2, 3 and 4

1, 3 and 4

Question 15

provides weak resistance against sulphate attack

is responsible for highest heat of evolution

characteristically fast reacting with water

All of the above

Question 16

All statements are true

Both Statement 2 and 4

Statement 3

561 kg/m³

472 kg/m³

383 kg/m³

294 kg/m³

k₁ > k₂

k₁ < k₂

k₁ = k₂

k₁ ≤ k₂

C₂S, C₃S and C₃A

C₃S, C₃A and C₂S

C₃A C₃S, and C₂S

C₃A, C₂S and C₃S