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WorksheetsGRADE 11- END OF TERM EXAM-2022-2023
Total questions: 80
Worksheet time: 40mins
What instrument is used to check the size of an angle?
level
protractor
square
t-bevel
If a tap was found leaking, what would be the first thing to check?
washer
spindle
seating
gland
On which section of a globe valve is the packing box located?
stem
set
bonnet
body
Which of these terms refer to vertical layouts?
straightening
plumbing
piping
leveling
If a drain 100 ft. long is laid to a gradient of 1ft. in 40ft. What will be the total fall of the drain?
2 ft. 6ins.
3ft.
3ft. 6 ins.
4ft.
What should be the height from floor level to the front rim of a bath tub?
10"-14'
12" -14"
14" -18"
16" -18"
The physical law, which applies to the flushing of high-up water closets is known as
capillary
convection
conduction
siphonage
What is the MINIMUM diameter soil drain permitted by building regulation?
1 1/2 inches
2 inches
3 inches
4 inches
What is the method of heat transfer by contact from one body to another?
conduction
convection
epansion
radiation
What name is given to the pipe installed to ventilate a building's drainage system and to protect trap seal?
drain pipe
trap seal protector
vent pipe
waste pipe
When a partial vacuum occurs in a branch waste pipe, what drives the water out of the pipe?
force of the water
height of the water
pressure of the atmosphere
quantity of water
Which set of tool is usd to make bolts and nuts?
tap and die
stock and die
pipe thread and die
pipe reamer and die
What is the mixture of vapous, odours and gasses found in sewer called?
drainage
liquid gas
natural gas
sewer gas
Which material is MOST malleable?
brass
copper
lead
plastic
Which is the BEST tool for cutting copper tubing?
wheel-type cutter
tubing cutter
hacksaw
chop saw
Which valve is used to prevent the dangerous build up of steam in a water heater?
check
gate
globe
pressure relief
By how many degrees does a one-quarter bend change the direction of the pipe?
22.5 degrees
45 degrees
72 degrees
90 degrees
What is the tap used on a lavatory basin called?
pillar tap
plain bib tap
plug tap
sink tap
How many seats are there in a gate valve?
four
three
two
one
Which material is MOST likely to be work-hardened, bending and working?
lead
copper
cast iron
brass
What must the plumber do to decrease the quantity of water in a water tank?
adjust the float rod down
adjust the float rod up
adjust the float rod side-ways
adjust the floatball
What is the weight in metric unit of 1 litre of water?
10 000 grams
1 000 grams
100 grams
10 grams
In which of these valves is a washer NOT needed?
needle
globe
gate
angle
Which hacksaw blade is MOST suitable for cutting thin wall copper tubes?
14 teeth per inch
18 teeth per inch
24 teeth per inch
32 teeth per inch
What colour is the hose used for acetylene?
red
green
brown
blue
Which tool is MOST effective in removing an existing lavatory basin faucet?
adjustable wrench
basin wrench
pipe wrench
pliers
Which material is MOST ductile?
cast iron
copper
lead
mild steel
Which valve is MOST likely to create water hammer?
gate
globe
plug
relief
If a flange has six holes, what is the difference in degrees between each hole?
22
30
45
60
Acetylene should NOT used at a working pressure exceeding
10 P.S.I.
15 P.S.I.
20 P.S. I.
30 P. S I.
Which valve is used to prevent backflow?
relief
gate
globe
check
What is the MAIN purpose of insulating steam or water lines?
strengthening the pipeline
reducing heat loss
preventing expansion
improving the appearance
Which valve should either be fully closed or opened during operation?
angle
check
gate
globe
Which is the LEAST importance when using a hacksaw?
tension of the blade
number of teeth per inch blade
length of the blade
direction of the blade
Which metal is an alloy?
zinc
lead
copper
brass
What is the MAIN reason that a plumber should NOT overtighten a ball valve lock nut or hold down bolts?
the washer will spread out too much
the valve may break
the thread on the valve or bolt may get damaged
the tank may break
Which method is used when expanding lead pipes?
heating
hammering
milling
soaking
What is the MAIMUMdensity of water?
4 degrees celsius
6 degrees celsius
12 degrees celsius
14 degrees celsius
What does the arrow on the side or top of the body of some valves indicate?
valve size
direction of flow
type of valve
type of threads on the body
Which tool is used to remove'burr'?
square
reamer
flat file
chisel
What is the purpose of the flex tube?
connect fixtures to supply lines
connect waste lines to fixtures
join 2 P.S.or pipes
test water pressure
Which is the method used when expanding plastic pipes?
hammering
heating
milling
soaking
When a welder stops working to have lunch, which of the steps listed below should he take?
tighten the regulator thumb screw
uncouple the regulators
release all pressure in the regulator
open the cylinder valves
Which fitting can be used in place of 'union'?
cap and lining
compression coupling
male to female
male to female elbow
Which instrument is used to check the gradient of a drainage system?
level
protractor
square
t-bevel
Which is the final stage of the waste disposal process used in factories?
burning
compacting
digesting
dumping
Which tool is used to cut threads on pipes?
square file
reamer
stock and die
chisel
What determines the types of hacksaw blade for a job?
length of the blade
teeth per inch
direction of the teeth
material to be cut
Which factors contribute to global warning?
excess oxygen and ozone layer depletion
excess carbon dioxide and excess oxygen
excess oxygen and excess nitrogen
excess carbon dioxide and ozone layer depletion
Leaks in gas piping can be located safely by application of-
soapy water
oil
fire
ammonia
Which fixture uses a P.O. plug?
lavatory basin
bath
water closet
kitchen sink
Which mineral produces permanent hard water?
calcium carbonate
calcium sulphate
magnesium
sodium bicarbonate
What is another name for specific gravity?
density
gravity
relative density
relative gravity
Which is the 'travel' of 45-degree offset, if the run is 10?
11.26
12.14
14.14
41.41
Which material MOST likely get the LEAST amount of damage by over-tightening?
brass
bronze
galvanized mild steel
plastic
What purpose does an expansion bend serve, when installed in a pipeline?
absorbing expansion and contraction
absorbing water hammer
extending the length of the pipeline
changing the direction of the pipeline
What is the standard height from finished floor to he rim of a lavatory basin?
36 inches
31 inches
3 inches
16 inches
Which is used to reduce the size of an opening in a fitting when a reducing coupling is not convenient?
elbow
bushing
plug
reducing coupling
What purpose does a manhole serve in a drainage system?
holds the excess water in case of a choke
holds the sewage gas and prevent it from entering the building
allows access to the drainage system
eliminates choke
If the seat on a large valve went bad, what should be done?
pack the valve
replace the seat
repair the valve
repair the seat
Which will result if the digs are set too close when threading a pipe?
threads will be shallow
threads will be loose
threads will break
dee will start easily
The size of the water service needed in a plumbing service will be affected MOST by the
size o the fixtures
number and kind of valve
number and kind of fixture
diameter of the street main
Which chemical listed below is used in the purification o water?
aluminum chloride
ferric chloride
niatric acid
sulphuric acid
What portion of sand and cement should be used to make a mortar joint on earthen-ware pipes?
1 part cement to 1 part sand
2 parts cement to 1part sand
3 parts cements to 2 parts sand
2 parts cement to 3 parts sand
How long does a solvent welded PVC joint take to reach full strength?
30 minutes
48 minutes
72 hours
90 hours
A grease trap should be installed on the waste line of a
urinal
lavatory basin
kitchen sink
bath tub
What is the total gradient on a 6 inch diameter soil pipe 120 feet long?
2 feet
3 feet
4 feet
6 feet
The purpose of a thermostat on a hot water cylinder is to-
control the temperature
heat the water
prevent corrosion
release excess pressure
Friction in the water supply piping can be reduced by increasing the-
flow rate
pipe length
pipe size
pressure
On a straight line a manhole should be placed at a maximum interval of?
50 ft
40 ft
20 ft
15 ft
Which source is considered sueface water?
flood
lake
rain
well
To which fixture is the term 'apron' front?
bath
kitchen sink
lavatory basin
urinal
The angle of a N.P.T.pipe thread is?
40 degrees
50 degrees
60 degrees
70 degrees
How many threads should be exposed after a screw joint is made on mild steel pipe?
one to two
three to four
two to three
three to five
Which material is the BEST to put around the outlet of a water closet when seating it to the floor?
clay
putty
rubber
wax
Which term is NOT related to trap seal loss?
wind effect
siphonage
evaporation
chlorination
What is the equipment in which pipes are held for cutting and threading called?
bench
clamp
jig
vise
'Cutting oil' is used when threading a pipe to-
thread the pipe faster
remove the chops more easily
clean the threads
lubricate the dies
The tank with given dimensions are filled with water. Which tank will exert the greatest P.S.I. on a pressure gauge that is installed one foot below the bottom of the tank?
20 ft. diameter and 52 ft. high
10 ft. diameter and 20 ft. high
6 ft. diameter and 60 ft. high
2 ft. diameter and 40 ft. high
Which of metal is NOT an alloy?
mild steel
lead
cast iron
brass
