Environmental Engineering MCQ Practice Test - Set 01

Practice Test: Question Set - 01

1. The polluted water is one which
    (A) Contains pathogenic bacteria
    (B) Consists of undesirable substances rendering it unfit for drinking and domestic use
    (C) Is safe and suitable for drinking and domestic use
    (D) Is contaminated

2. Orthotolidine test is used for determination of
    (A) Dissolved oxygen
    (B) Residual chlorine
    (C) Biochemical oxygen demand
    (D) Dose of coagulant

3. The chemical most commonly used to increase speed of sedimentation of sewage is
    (A) Sulphuric acid
    (B) Copper sulphate
    (C) Lime
    (D) Sodium permanganate

4. The disinfection efficiency of chlorine increases by
    (i) Decreasing the time of contact
    (ii) Decreasing the temperature of water
    (iii) Increasing the temperature of water
    The correct answer is
    (A) Only (i)
    (B) Both (i) and (ii)
    (C) Both (i) and (iii)
    (D) Only (iii)

5. The layout of distribution system in which water flows towards the outer periphery is
    (A) Ring system
    (B) Dead end system
    (C) Radial system
    (D) Grid iron system

6. The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is
    (A) Reflux valve
    (B) Sluice valve
    (C) Air relief valve
    (D) Pressure relief valve

7. The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is
    (A) Separate system
    (B) Combined system
    (C) Partially separate system
    (D) Partially combined system

8. The main disadvantage of cement concrete sewers is
    (A) Less strength
    (B) Difficulty in construction
    (C) Difficulty in transportation due to heavy weight
    (D) Less life

9. Settling velocity increases with
    (A) Specific gravity of solid particles
    (B) Size of particles
    (C) Depth of tank
    (D) Temperature of liquid

10. Facultative bacteria are able to work in
    (A) Presence of oxygen only
    (B) Absence of oxygen only
    (C) Presence as well as in absence of oxygen
    (D) Presence of water

11. The suitable layout of distribution system for a city with roads of rectangular pattern is
    (A) Grid iron system
    (B) Dead end system
    (C) Ring system
    (D) Radial system

12. The slope of sewer shall be
    (A) Given in the direction of natural slope of ground
    (B) Given in the direction opposite to natural slope of ground
    (C) Zero
    (D) Steeper than 1 in 20

13. The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by
    (A) TOD > BOD > COD
    (B) TOD > COD > BOD
    (C) BOD > COD > TOD
    (D) COD > BOD > TOD

14. The working conditions in imhoff tanks are
    (A) Aerobic only
    (B) Anaerobic only
    (C) Aerobic in lower compartment and anaerobic in upper compartment
    (D) Anaerobic in lower compartment and aerobic in upper compartment

15. The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called
    (A) Waste pipe
    (B) Soil pipe
    (C) Vent pipe
    (D) Anti-siphonage pipe

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