Assertion (A): Calcium chloride addition in concrete proves more effective in slow- hardening portland

cement than in rapid- hardening cement 

Assertion (A): Pozzolana is added to cement to increase early strength.

Reason (R): It reduces the heat of hydration.

Consider the following statements:

The salient features of a bar chart over network are that:

1. It is simple to draw and easy to understand 

2. It is unable to depict interdependence of activities 

3. It is clearly distinguishes between critical and non-critical activities 

4. It is not possible to crash activities to get optimum and minimum duration of the project

Which of the following pairs in respect of Ordinary Portland Cement (OPC) are correctly matched? 

1. Initial setting time ... 30 minutes

2. Final setting time ….10 hours

3. Normal consistency  …. 10%

Consider the following statements: 

1. Cambium layer is between sapwood and heartwood. 

2. Heartwood is otherwise termed as deadwood. 

3. Timber used for construction is obtained from heartwood.

Which of the following are the advantages of crawler mounted bulldozer over mounted bulldozers? 

A. Higher travel speed 

B. Able to travel over very soft soil 

C. Able to travel over very rough surfaces having no haul roads 

Which of these statements are correct?

Consider the following statements: 

1. Bricks lose their strength by 25% when soaked in water 

2. Minimum crushing strength of brick in buildings should be 35 kg/cm².

Match the following lists:

Select the correct answer using the code given below:

P        Q    R   S

Duration along the critical path defines which of the following?

A. Shortest duration needed

B. Shortest duration permissible

C. Longest duration needed

D. Longest duration permissible 

Assertion (A): Dimensional changes in wood result due to variation in the moisture content of the wood with atmospheric

condition. 

Reason (R): The cell walls in wood are highly hygroscopic and when exposed to moisture, absorb large amounts of water

and swell. 

Statement (I) Timber suitable for tension members is obtained from coniferous trees.

Statement (II): Coniferous trees have distinct annular rings and straight grains.

Match List I (Inputs into Networks) with List II (Basis) and select the correct answer :        

Code:   

        A          B          C          D

Assertion (A): Brick work (especially new work) sometimes develops efflorescence on the surface after wetting and drying.

Reason (R): Fired clay bricks may contain soluble salts in which sulphates of sodium, potassium magnesium and calcium

usually predominate. 

Assertion (A): The strength of brick masonry is purely dependent upon the type of mortar used.

Reason (R): Mortar is the binding material in masonry.

Match List I (Component of scaffolding) with List II (Function) and select the correct answer

          Codes:

The time estimates obtained from four contractors P, Q, R and S for executing a particular job are as

under:  

Which one of these contractors is more certain about completing the job in time?

PERT calculations yield a project length of 60 weeks with a variance of 9 weeks. Probability factor

corresponding to 95% probability is 1.647; then the number of weeks required to complete the project with a

probability of 95% is