A water supply distribution system for an averagely-populated township is to be designed for

 A combined sewerage system is more appropriate for developed areas where

100 m³ of sludge holds a moisture content of 95%. If its moisture content chagnes to 90%, the volume of this sludge will then be

The design overflow rate of a sedimentation tank is chosen considering

Consider the following statements in respect of flow equalization in a waste water treatment plant : 
1. Biological treatment is enhanced because shock loadings are eliminated or minimized
2. Flow equalizations is an attractive option for upgrading the performance of overloaded treatment plants.
3. Inhibiting substances can be diluted and pH can be stabilized
4. Thickening performance of primary sedimentation tanks following grit removal is improved.
 Which of the above statements are correct? 

A drain carrying 5m³/s of wastewater with its BOD of 100mg/l joins a stream carrying 50 m³/ s flow with its BOD of 5mg/l. What will be the value of the BOD of the combined flow after complete mixing?

Consider the following statements in respect of aerated grit chamber:
1. The grit accumulates at the bottom in advancing spiral-flow aeration tanks, location ally preceded by grit chambers, led to the eventual development of aerated grit chambers.
2. The excessive wear on grit handling equipment is a major factor for the popularity of aerated grit chambers.
3. Aerated grit chambers are designed to provide detention period of 1 minute at maximum rate of flow.  
4. Diffusers are located at 0.45 m to 0.6 m above the bottom of teh chamber.
Which of the above statements are correct? 

Quick sand condition occurs when 

The side of a square land was measured as 150 m and is in error by 0.05 m. What is the corresponding error in the computed area of the land.

Consider the following statements in respect of anaerobic sludge digester:
1. It is less expensive compared to several other methods available.
2. Processing of separable solids impacts the environment to a minimum
3. Quantity of separated solids requiring disposal is minimal
4. Digested sludge is very readily dewaterable.
Which of the above statements are correct? 

Consider the following statements :
1. There will be no defects in select grade timbers.
2. The codal values for strength of grade-II timer without defects may be reduced by 37.5%.
3. For timber used as columns, the permissible stress in ungraded timbers is adopted with a multiplying factor of 0.50.
4. In case of wind force and earthquakes, a modification factor of 1.33 is adopted. Which of the above statements are correct ? 

Consider the following statements regarding timber :
1. The strength of timber increases by Kiln seasoning.
 2. Cutting of wood is to be done prior to treatment.
3. Water seasoning is good for prevention of warping.
4. ASCU treatment enhances the strength of wood. Which of the above statements are correct ?

Gase(s) emitted during rotting or decomposition of timber is /are mainly

Efflorescence of bricks is due to

Disintegration of bricks masonry walls is primarily due to
1. Efflorescence
2. Magnesium sulphate in brick  
3. Calcined clay admixtures
4. Kankar nodules
Which of the a above statements are correct ? 

Consider the following statements:
1. IS 3583 refers to Burnt Clay Paving Bricks.
2. IS 5779 refers to Burnt Clay Soling Bricks.
3. IS 3952 refers to Burnt Clay Hollow Bricks.
4. IS 2222 refers to Burnt Clay Lay Bricks.
Which of the above statements are correct?

Consider the following statements:
1. A high aggregate impact value indicates strong aggregates.
2. A low aggregate crushing value indicates high crushing strength of aggregates.
3. Aggregates having elongation index values greater than 15% are generally considered suitable for pavement construction.
4. Flakiness index of aggregates should not be less than 25% for use in road construction.
Which of the above statements are correct?

Consider the following statements regarding refractory bricks in furnaces:
1. The furnace is fired at temperatures more than 1700°C.
2. Silica content in the soil should be less than 40%.
3. Water absorption of bricks should not exceed 10%
4. Chrome bricks are known as basic bricks. Which of the above statements are correct?

Consider the following statements about lime:
1. Calcination of limestone results in quick lime.
2. Lime produced from pure variety of chalk is hydraulic lime.
3. Hydrated lime is obtained by treating quick lime with water.
Which of the above statements are correct?

Consider the following statements:
1. If more water is added to concrete for increasing its workability, it results into concrete of low strength.
2. No slump is an indication of a good workable concrete.
3. Higher the slump of concrete, lower will be its workability.
4. Workability of concrete is affected by water content as well as water-cement ratio.
Which of the above statements are correct?

One bag of Portland cement, 50 kg in weight, would normally have a bulk volume of

AsCu, a preservative for wood, developed by the Forest Research Institute, Dehradun, comprises of chemicals:

Consider the following statements related to autoclave bricks:
1.Less water absorption compared to other bricks.
2.Noise reduction
3.It is cheap compared to other types of bricks.
4.Requirement of bulk volume of mortar in joints being relatively less compared to other types of brick masonry.
5.Not recommended for outer walls. 
Which of the above statements are relevant to the use of ‘autoclave’ bricks? 

The minimum number of annular rings to be seen in every 2.54 cm in the radial direction from the core for timber to be classified as ‘Dense’ is

If the actual thickness of a brick masonry wall is 19 cm, its effective length is 2.70 m, its effective height is 2.82 m and its code specified stiffening coefficient is 1.2 then, for design considerations, the slenderness ratio of the wall will be taken as

What will be the depth of penetration of the plunger in Vicat Apparatus (IS : 5513 - 1976) from the bottom of the Vicat Mould, when the cement paste is tested for standard consistency, according to IS 4031 – 1988 ?

Two sewer pipelines A and B (having the same diameter and made of the same material) are laid at a bed slope of 1 in 225 and 1 in 625, respectively. Determine the ratio of their carrying capacities (Q_A to Q_B) .

Select the correct statement with respect to an over - reinforced cement concrete section under the working stress method .

A cantilever beam of span L is built - in at the support. It is restrained against lateral deflection and torsion at the free end. The effective length of compression flange for the beam as per IS 800 : 2007 is

What is the principle of plane surveying ?

According is IS 5968 : 1987, the minimum radius of radius of curve to be provided in the alignment of unlined canals carrying a discharge of less than 30 cumecs up to 15 cumecs is :

A Pelton wheel is to be designed for a pitch diameter of 1 m and jet diameter of 0.1 m. The number of buckets on the runner computed by Taygun’s formula is :

What is the effect of fly ash in concrete ?

As per IS 456 : 2000, the minimum grade of concrete to be used for plain concrete and reinforced concrete, respectively, in concrete works exposed directly along the sea coast are :

Identify the property that changes as a function of the geometrical dimensions of a section in structural materials :

As per IRC (Indian Roads Congress) recommendation, what will be the designed stopping sight distance (in metres) at the vehicle speed of 80 km/h on a rural highway ?

No deduction is made in the quantity estimation for plastering work in cement mortar for openings having size up to :

What is the height of slump cone mould used for testing the workability of the concrete ?

Select the correct option with regard in the following statements (S1, S2) pertaining to pavements .
S1 : Present serviceability index is used for the functional evaluation of pavement surface condition
S2 : Rigid pavements are less affected by temperature variations than flexible pavements

If the quadrantal bearing of a line AB is S 31'35' E, then its whole circle bearing is equal in :

The overflowing sheet of water on a weir is called :

According to IS 456 - 2000, what is the slump of a medium degree of workability of concrete if planed in heavily reinforced sections like slabs, beams, walls, columns ?

Which of the following is Kharif season in India ?

The estimated value of a built - up property at the end of its useful life without dismantled is called :

The amount of cement required for 100 m² area, of damp proof course with 2.5 cm thinkness, in with proportion of 1: 2 : 4 (cement : sand : aggregate) will be :

Select the correct statement related to increasing the carbon content in steel from 0.2 to 0.9 percent .

Which of the following laws states that pressure or intensity of pressure at a point is static fluid is equal in all directions ?

The determination of plasticity index and the percentage by weight of clay mineral finer than 2 µ present in the soil were done for two soil samples A and B. The ratio of plasticity index to the percentage of clay size particle for the samples A and B are given in the table .
Soil sample      Ratio of plasticity index to percentage of clay size particle
Sample A          Less than 0.75
Sample B          Greater than 1.25 The two soil sample A and B are classified as

Which of the following compounds of cement is responsible for early strength ?

According to SP : 27 - 1984, the thickness of slab or RC slab shall be measured to the nearest of :