Environmental Engineering Quiz Set-1 [2025]

The pathogens can be killed by

In Air pollution RSPM stands for

Which of the following is not a water borne disease?

Ground water is usually free from

Dissolved oxygen in streams is

Which of the following is water disinfectant method?

Which of the following is not a unit of city water treatment plant?

As compared to geometrical increase method of forecasting population, arithmetical increase method gives

The population of a town in three consecutive years are 5000, 7000 and 8400
respectively. The population of the town in the fourth consecutive year according to geometrical increase method is

The suitable method of forecasting population for a young and rapidly increasing city is

In water treatment for removal of solids an unit is used as shown in the figure
which is called as

BOD in portable water may be

Fresh and septic sewage are respectively

The depression of water table in a well due to pumping will be maximum ...

where R is the radius of influence

The devices which are installed for drawing water from the sources are called

The type of valve, which is provided on the suction pipe in a tube-well, is

Turbidity is measured on

On standard silica scale, the turbidity in drinking water should be limited to

Residual chlorine in water is determined by

If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to

The design period for a water supply project is taken as

Floating debris from water is removed through

The rain is generally termed as acidic if pH value of rain water falls below

The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about

The major disadvantage of lime soda process of water softening is that

Which of the following compounds is widely used for algae control?

The specific gravity of sewage is

The slope of sewer shall be

As the result of stabilization of sewage effluent, the most approximate end product is

The specific gravity of sewage is

Most of the bacteria in sewage are

The design discharge for the combined sewer system shall be taken as

The design discharge for the separate sewer system shall be taken as

The minimum and maximum diameters of sewers shall preferably be

The main disadvantage of cement concrete sewers is

Most suitable section of sewer in separate sewage system is

The best sewer material to resist hydrogen sulphide corrosion is

Laying of sewers is usually done with the help of

The ratio of minimum hourly flow to the average flow of sewage is

An egg shaped section of sewer

The velocity of flow does not depend on

The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is

The effect of increasing diameter of sewer on the self cleansing velocity is

The most commonly used sewer under culverts is

The type of sewer which is suitable for both combined and separate system is

The characteristics of fresh and septic sewage respectively are

Which of the following retards the self purification of stream?

Settling velocity increases with

The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by

Select the correct statement

The rate of BOD exerted at any time is

The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is

Facultative bacteria are able to work in

Sewerage system is designed for

Sewage treatment units are designed for

Laying of sewers is usually done with the help of

Corrosion in concrete sewers is caused by

If the sewage contains grease and fatty oils, these are removed in

Generally the detention period for grit chambers is kept as

Which of the following unit works in anaerobic conditions?

Sludge volume index is defined as the ratio of

The gas from sludge digestion tank is mainly composed of

A pipe which is installed in the house drainage to preserve the water seal of traps is called

If any human being comes in contact of 600 ppm of CO for 10 hours effect will be

Effect of over exposure to ozone on human being if one of the following

Percentage of Argon by volume in atmosphere is

The dead storage in a reservoir is provided for storage of

pH value of water indicates its

Which of the following will contain water with the maximum amount of turbidity

One of the following scientists is associated with theory in soil Mechanics

If the voids of a soil mass are full of air only, the soil is termed as

Select the correct statement.

Voids ratio of a soil mass can

When the degree of saturation is zero, the soil mass under consideration represents

If the volume of voids is equal to the volume of solids in a soil mass, then the values of porosity and voids ratio respectively are

If the degree of saturation of a partially saturated soil is 60 %, then air content of the soil is

If the water content of a fully saturated soil mass is 100%, then the voids ratio of the sample is

The ratio of volume of voids to the total volume of soil mass is called

Foundation shown in the figure is called as -

If the sand in-situ is in its densest state, then t

Which of the following methods is most accurate for the determination of the water content of soil?

For proper field control, which of the following methods is best suited for quick determination of water content of a soil mass?

A pycnometer is used to determine

Stoke's law is valid only if the size of particle is

In hydrometer analysis for a soil mass

Which of the following is a measure of particle size range?

Which of the following statements is correct?

Uniformity coefficient of a soil is

If the natural water content of soil mass lies between its liquid limit and plastic limit, the soil mass is said to be in

When the plastic limit of a soil is greater than the liquid limit, then the plasticity index is reported as

Toughness index is defined as the ratio of

If the plasticity index of a soil mass is zero, the soil is

The admixture of coarser particles like sand or silt to clay causes

Select the correct statement.

The water content of soil, which represents the boundary between plastic state and liquid state, is known as

Which of the following soils has more plasticity index?

At liquid limit, all soils possess

If the material of the base of the Casagrande liquid limit device on which the cup containing soil paste drops is softer than the standard hard rubber, then

According to IS classification, the range of silt size particles is

The effective stress is

When the degree of consolidation is 50 % ,the time factor is about

Vacum well points are generally used for draining

Highway Research Board (HRB) classification of soils is based on

Inorganic soils with low compressibility are represented by

Sand particles are made of

The clay mineral with the largest swelling and shrinkage characteristics is

Dispersed type of soil structure is an arrangement comprising particles having

Effective stress is

Rise of water table above the ground surface causes

The total and effective stresses at a depth of 5 m below the top level of water in a swimming pool are respectively

If the water table rises upto ground surface, then the

Quick sand is a

Chemical grouting is used for

The gas formed by the reaction of calcium carbide with water is

The seepage pressure is proportional to

The hydraulic head that would produce a quick condition in a sand stratum of thickness 1.5 m, specific gravity 2.67 and voids ratio 0.67 is equal to

Physical properties of a permeant which influence permeability are

Select the correct statement.

The behavior of clay is governed by

The weakest bond in soil is

Honey combed structure is found in

Effective stress on soil

If the permeability of a soil is 0.8 mm/sec, the type of soil is

Which of the following methods is more suitable for the determination of permeability of clayey soil?

Which of the following methods is best suited for determination of permeability of coarse grained soils?

Due to a rise in temperature, the viscosity and the unit weight of the percolating fluid are reduced to 60 % and 90 % respectively. If other things remain constant, the coefficient of permeability

Coefficient of permeability of soil

The average coefficient of permeability of natural deposits

The total discharge from two wells situated near to each other is

Relative density of a compacted dense sand is approximately equal to

Terzaghi’s bearing capacity factor depends on

Co efficient of curvature of a well graded gravel is

The flownet for an earthen dam with 30 m water depth consists of 25 potential drops and 5 flow channels. The coefficient of permeability of dam material is 0.03 mm/sec. The discharge per metre length of dam is

The most suitable method for drainage of fine grained cohesive soils is

Total number of stress components at a point within a soil mass loaded at its boundary is

The slope of isochrone at any point at a given time indicates the rate of change of

The value of compression index for a remoulded sample whose liquid limit is 50 % is

A normally consolidated clay settled 10 mm when effective stress was increased from 100 kN/m2 to 200 kN/ m2. If the effective stress is further increased from 200 kN/ m2 to 400 kN/ m2, then the settlement of the same clay is

In a deposit of normally consolidated clay

The most accurate method for the determination of water content in the laboratory is

An inorganic clay of high compressibility is represented by the symbol

Phreatic line in an earthen dam is