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WorksheetsWATER SUPPLY
Total questions: 50
Worksheet time: 25mins
The hydrogen atom of the water molecule has ______ charge.
Positive
Negative
Neutral
Static
Delayed rise in water temperature before it begins to get hot due to its high _____.
Specific gravity
Conductivity
Specific heat index
Atomic number
Fresh water achieves maximum density at around _____ degree Celcius
O
4
28
100
The maximum density of water is ____ g/cm3
0.5
1
4
10
The following are major cations in natural water except:
Ca2+
Mg+
K+
Ni2+
____ is expressed as mg/L CaCO3-
Acidity
Alkalinity
Hardness
Turbidity
The ____ ion concentrations in water influence its pH level
Oxygen
Nitrogen
Carbon dioxide
Hydrogen
The following statement regarding physical characteristics of water is False
When water freezes, it expands rapidly adding about 9% by volume
Chemical and biological reaction rates increase with increasing temperature
Colour can indicate the pesence of humid substance
Sweet bitter taste are produced by inorganic compounds
The primary constituent that can cause water hardness is ____
Magnesium
Sodium
Calcium
Aluminium
Excessive accumulation of ____ in hot water piping affects heat transfer and could lead to plugging
FeSO4
CaCO3
CaSO4
H2CO3
Dringking water supply may contain the following substance
Suspended materials
Harmful microorganism
Salt and minerals
Radioactive particles
Arrange the following in the correct order of hydrological cycle
I) evaporation
Ii) precipitation
Iii) groundwater movement
Iv) surface runoff
I-ii-iv-iii
Iv-ii-iii-i
Iv-ii-i-ii
Ii-iv-iii-i
The role of driainage and irrigation department is to ____
Monitor the drinking water quality
Monitor hydrological data of river
Control allocation of fund for water supply
Ensure the water supply meets drinking water quality standard
The following are source of surface water except
Spring
Stream
River
Reservoir
The function of concrete apron in tube well is to prevent ____
Infiltration from surrounding soil
Water from being drown to the surface
Groundwater from surface contamination
The earth surrounding the well from collapsing
The void space in saturation zone of soil are filled with ____
Water
Air
Sand
Silt
Gravity feed system supplies water from ____
Source at higher ground to the community by means of a reciprocating pump
Catchments area uphill to the community downhill by means of a hydraulic ram
Source at higher round to the community by means of gravitational force
River to the nearby community by means of distribution pipes
The following are advantages of gravity feed water supply system except
Use gravity to deliver water
Low maintenance costs
Yield is reduced during drought
No pumping is required
Organic chemicals that pollute water includes the following except
Plastics
Ammonia
Gasoline
Oil
The following are statement regarding stream pollution except
Fast flowng stream recover faster from pollution compared to those reduced fliow
Natural biodegradation of pollutants take place in stream
Natural biodegradation is effective when stream is overloaded with pollutants
Natural biodegradation become ineffective when stream flow is reduced
The following statement regarding soil is true
Soil is the upper part of the earth’s crust
Soil is absent from organism
Soil consists of minerals and organic materials only
Soil formation us not influence by weathering process
Gravels are soil particles with diameter
Less than 1 mm
Less than 2 mm
More than 2 mm
Between 1 mm and 2 mm
The following are example of sil structure except
Prismatiic
Rocky
Granular
Blocky
Which of following is true about soil profiles
The A horizon is the organic horizon
There is little biological activity in the C horizon
Hard bedrock are found in horizon A
Horizon B accumulates iron and aluminium oxides
____ is not a main textural class of soil
Sand
Silt
Clay
Loam
The following statement is false about soil pores:
Micropores are abundant in fine textred soil
Soil space consists of micropores and macropores
Pore space in unsaturated zone are occupied by on water
Pore space(%) = b((bulk density/particle density) x 100)
The following is effect of physical weathering:
Water breaks down hydroxides to form limestone
Rock breaks down into smaller pieces
Minerals combine with oxygen
Electron are released from minerals atoms
Which ofthe following is not a type of chemical weathering
Hydrolysis
Reduction
Thermal expansion
Oxidation
Soil colour can determine the ____
Plant root activity
Type of soil horizon
Pore size
Bulk density
The following are examples of mechanical weathering except
Abrasion
Frost wedging
Exfoliation
Dissolution
A public water supply system should have at least ____ service connections
10
15
50
100
The important elements in public water supply system are ___
I) source
Ii) treatment plant
Iii) storage tank
Iv) distribution System
I and ii only
Iii and iv only
I, ii, iv only
I, ii, iii, and iv
The surveillance of drinking water quality is the responsibility of ____
Ministry of natural resources and environment
Ministry of health
Ministry of agriculture
Ministry of urban wellbeing, housing and local goverment
The following are classified as group 1 parameter under malaysian drinking water quality surveillance program except
PH
Total dissolve solid
Turbidity
Residual chlorine
The accepted value for hardnessfor raw water under Malaysia Drinking Water Quality Surveillance Program is ____ mg/L
50
250
500
1000
The accepted value for pH for treated water under Malaysian Drinking Water Quality Surveillance program is _____
Less than 6
5.0-6.5
6.5-9.0
Above 9.0
The expression of the results for colour in water is _______
NTU
MPN
TCU
CFU
Bacteriological sample must be analysed within ___ hours after collection.
24
36
48
72
Long term effect of drinking water with high concentration of aluminium will cause _____
Cancer
Menthemoglobionemia
Diarrhoea
Alzheimer’s disease
The following are types of disinfection process used in water treatment except
Chlorination
Uv
Ozonization
Deionization
_____ is where chlorine demand has been fully satisfied durin chlorination process
Residual chlorine
Combined chlorine
Breakpoint chlorine
Hypovhlorination
_____ is indicator organism in water quality surveillance programme
Salmonella thypi
Vibro cholerae
Balantidium coli
Escherichia coli
The following are classification of water storage tank except
Underground tanks
Refinery tanks
Thanks resting on ground
The most importantreason for maintaining a continuous positive pressure throughout the distribution system is to ____
Prevent damage to water meters
Prevent leakage of water
Prevent backflow
Maintain chlorine residual
The quaterly monitoring of driking water is coded as____
Y/2
Y/3
Y/4
Y/6
Which the following is used to rise pH value in water treatment plant?
Al2(so4)3
CaCl2
Ca(OH)2
AlCl3
_____ is added in water samples to neutralized residual chlorine
Hydrogenchloric acid
Sodium sulphate
Natrium thiosulphate
Calcium hydroxide
The main function of service reservoir except
Store untreated water before distrbution to consumers
Absorb hourly variation in water demand
Allow the treatment unit work at constane rate
Maintain constanct pressure in the distribution mains
Requirements for a good water distribution systm except
Should convey water with impuritiesto comsumers
Hard to maintain and operate
Protected from contamination
Durable
Types of layout for water distribution system Except
Dead end system
Matrix system
Circular system
Radial system
