In normal circumstances where ambient temperature does not fall below 15°C, for a properly cured reinforced concrete slabs spanning up to 4.5 metre span cast using ordinary Portland cement, the props provide can be removed only after a minimum period of

The following statements (S1, S2, S3) pertain to mass concreting. Which of the following statements are correct? S1: The materials preferred for mass concrete are: Portland cement with low heat of hydration, Pozzolanas, Aggregates (coarse and fine), Water, Admixture, Coolants. S2: Slump of mass concrete shall be the same or more than ordinary concrete work. S3: Concrete with a low water cement ratio, correctly consolidated and properly cured provides durability to mass concrete work.

A

S1 and S2 only

B

S2 and S3 only

C

S1 and S3 only

D

S1, S2, S3

Which one of the following is the correct sequence of various stages of operating cycle of a manufacturing company? 1. Raw material conversion period, work-in-progress conversion period, Finished goods conversion period, Receivables conversion period 2. Raw material conversion period, work-in-progress conversion period, Creditors payment period, Receivables conversion period 3. Creditor payment period. Raw material conversion period, Receivables conversion period, work-in- progress conversion period 4. Raw material conversion period, Finished goods conversion period, work-in- progress conversion period. Receivables conversion period

A

1

B

2

C

3

D

4

Which of the following statements about gene therapy are correct?
P. Affected individuals, but not their progeny, can be cured through germline gene therapy.
Q. Affected individuals, as well as their progeny, can be cured through germline gene therapy.
R. Affected individuals, but not their progeny, can be cured through somatic gene therapy.
S. Affected individuals, as well as their progeny, can be cured through somatic gene therapy.

A

P and R only

B

P and S only

C

Q and R only

D

Q and S only

Consider the following statements: 1) Hydrophobic cement grains possess the low wetting ability 2) Rapid-hardening cement is useful in concreting under static, or running water 3) Quick-setting cement helps the concrete to attain high strength in the initial period 4) White cement is just a variety of ordinary cement-free of coloring oxides. Which of the above statements are correct?

A

1 and 4 only

B

1 and 3 only

C

2 and 4 only

D

2 and 3 only

Permeability in concrete is studied towards providing for, or guarding against, which of the following features? 1. The penetration by materials in solution may adversely affect the durability of concrete; moreover, aggressive liquids 'attack' the concrete. 2. In the case of reinforced concrete, ingress of moisture and air will result in corrosion of steel leading to an increase in the volume of steel, resulting in cracking and swilling of the concrete cover. 3. The moisture penetration depends on permeability and if the concrete can become saturated with water it is less vulnerable to frost action.

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

Consider the following statements: 1. Functions of reinforcement in reinforced soil and in reinforced concrete are comparable. 2. The design of a geotextile reinforced wall is similar in principle to that of a reinforced earth wall. Which of the above statements is/are correct?

A

1 only

B

2 only

C

Both 1 and 2

D

Neither 1 nor 2

Which country has recorded second highest COVID19 death toll in world after China?

A

Italy

B

Iran

C

India

D

Japan

An arch bridge having span length of 10.25 m is being constructed. The wearing course slab thickness is 325 mm. If the first arch is cast today, after how many days should the props be removed?

A

7

B

21

C

14

D

28

Consider the following statements related to the advantages of concrete sleepers : 1. Concrete sleepers can generally be mass-produced using local resources. 2. Concrete sleepers are not suitable for better packing. 3. Concrete sleepers have a very long life span. 4. Concrete sleepers have no scrap value. Which of the above statements is/are correct?

A

1 only

B

1 and 3 only

C

2 only

D

2 and 4 only

With reference to 'fly ash' produced by the power plants using coal as fuel, which of the following statements is/are correct? 1. Fly ash can be used in the production of bricks for building construction. 2. Fly ash can be used as a replacement for some of the Portland cement contents of concrete. 3. Fly ash is made up of silicon dioxide and calcium oxide only, and does not contain any toxic elements. Select the correct answer using the code given below

A

1 and 2

B

2 only

C

1 and 3

D

3 only

Type of Formwork	Minimum Period Before Striking Formwork
Vertical formwork to columns, walls, beams.	16 - 24 h (1 Day)
Soffit formwork to slabs	3 days
Soffit formwork to beams	7 days
Props to slabs a. Spanning up to 4.5 m b. Spanning over 4.5 m	7 days 14 days
Props to beams and arches a. Spanning up to 6 m b. Spanning over 6 m	14 days 21 days

In normal circumstances where ambient temperature does not fall below 15°C, for a properly cured reinforced concrete slabs spanning up to 4.5 metre span cast using ordinary Portland cement, the props provide can be removed only after a minimum period of

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