What should be located before a plumbing repair begins?
A The wall colour
B The water shutoff valve
C The room number
D The tool brand
Answer: B. The water shutoff valve. Know where the relevant shutoff is before starting a repair.
What can isolate water to one fixture?
A A paint scraper
B A fixture shutoff valve
C A door hinge
D A floor drain
Answer: B. A fixture shutoff valve. A fixture shutoff valve can stop supply to one sink or toilet.
Why should a faucet be opened after shutting off supply?
A Increase water pressure
B Release remaining pressure
C Test the drain trap
D Clean the pipe
Answer: B. Release remaining pressure. Opening the fixture can release remaining pressure in the line.
What should be placed under a leaking connection?
A An electrical extension cord
B A paper book
C A carpet
D A bucket or tray
Answer: D. A bucket or tray. A bucket or tray can catch drips and protect nearby surfaces.
What does a P-trap do?
A Holds water against sewer gases
B Raises water pressure
C Filters all minerals
D Stops every leak
Answer: A. Holds water against sewer gases. A trap holds a water seal that helps block sewer gases from entering the room.
Why does a sink drain need a vent?
A Add drinking water
B Raise pipe temperature
C Replace the trap
D Support drainage and trap function
Answer: D. Support drainage and trap function. A properly designed vent helps drainage and protects trap seals.
What can a dry drain trap allow into a room?
A Fresh air only
B Sewer odours
C Drinking water
D Extra pressure
Answer: B. Sewer odours. A dry trap can allow sewer gases or odours into the room.
Which item helps stop backflow into potable water?
A Paint roller
B Open bucket
C Pipe wrench
D Approved backflow preventer
Answer: D. Approved backflow preventer. A suitable backflow preventer helps keep non-potable water from entering drinking-water plumbing.
What is backflow?
A Reverse flow toward clean supply
B A blocked air vent
C Water leaving a tap
D A loose faucet handle
Answer: A. Reverse flow toward clean supply. Backflow is reverse flow that can draw contaminated water toward a potable supply.
Why should potable and non-potable water lines stay separated?
A Improve paint finish
B Increase pipe length
C Reduce fixture size
D Prevent contamination
Answer: D. Prevent contamination. Separating potable and non-potable systems reduces contamination risk.
Which tool can tighten many plumbing nuts?
A Claw hammer
B Adjustable wrench
C Spirit level
D Handsaw
Answer: B. Adjustable wrench. An adjustable wrench can grip a range of nut sizes.
How should a wrench fit a nut?
A Loosely on one corner
B Snugly on the flats
C Across the pipe opening
D On the washer
Answer: B. Snugly on the flats. A snug fit on the flats reduces slipping and rounding.
What should be done if a pipe joint keeps leaking?
A Tighten without limit
B Cover it with paint
C Ignore water stains
D Stop and inspect the joint
Answer: D. Stop and inspect the joint. Stop and inspect the joint; overtightening can damage fittings.
Which seal is often replaced in a dripping faucet?
A Wall anchor
B Hinge pin
C Paint gasket
D Washer or cartridge
Answer: D. Washer or cartridge. Some faucet leaks involve worn washers or cartridges, depending on the design.
What should guide replacement faucet parts?
A Room paint colour
B Pipe brand logo
C Fixture model and instructions
D A random fitting
Answer: C. Fixture model and instructions. Use compatible parts specified for the fixture model.
Why should water be wiped up near electrical equipment?
A Improve water pressure
B Clean pipe threads
C Reduce sewer odour
D Avoid shock and damage risk
Answer: D. Avoid shock and damage risk. Water near electrical equipment can create shock hazards; keep clear and get help if needed.
What should be done if a leak is near a live electrical outlet?
A Touch the wet wall
B Keep back; call for help
C Use a metal tool
D Continue plumbing
Answer: B. Keep back; call for help. Keep away from water near live electrical equipment and contact qualified help.
Which drain-cleaner practice is unsafe?
A Following the label
B Using gloves if directed
C Keeping products stored
D Mixing different chemicals
Answer: D. Mixing different chemicals. Never mix drain cleaners or household chemicals; hazardous reactions can occur.
What should be checked before using a drain cleaner?
A Bottle colour only
B Product label and compatibility
C Room furniture
D The plunger size
Answer: B. Product label and compatibility. Follow product precautions and verify the cleaner suits the pipe and blockage.
What can a plunger help clear?
A A broken water main
B A gas leak
C A cracked structural pipe
D Some local drain blockages
Answer: D. Some local drain blockages. A plunger can help clear certain local clogs at a fixture.
What can a drain strainer help prevent?
A Water pressure rising
B Hair and debris entering
C Sewer gases forming
D Pipe joints loosening
Answer: B. Hair and debris entering. A strainer can catch hair and debris before they enter the drain.
How should a sewage backup be handled?
A Touch it with bare hands
B Run more water
C Avoid contact and call professionals
D Clean with dry cloth
Answer: C. Avoid contact and call professionals. Sewage can contain pathogens; avoid contact and seek qualified cleanup.
What does a water meter help monitor?
A Pipe temperature
B Drain trap depth
C Tap colour
D Water use and possible leaks
Answer: D. Water use and possible leaks. Unexpected meter movement when fixtures are off can indicate a leak, but confirm the cause.
Which sign may suggest a hidden water leak?
A Fresh paint
B Dry flooring
C Clear pipe label
D Persistent damp patch
Answer: D. Persistent damp patch. Persistent dampness or unexplained water stains can indicate a leak.
What can corrosion do to plumbing?
A Improve water quality
B Weaken pipes and fittings
C Stop every leak
D Increase pipe strength
Answer: B. Weaken pipes and fittings. Corrosion can weaken plumbing components and lead to leaks.
Why should drinking-water fittings be chosen carefully?
A Colours change pressure
B Materials can affect water quality
C Every fitting is identical
D Labels are decorative
Answer: B. Materials can affect water quality. Plumbing materials in contact with drinking water can affect water quality; follow local standards.
What should be checked on a plumbing product label?
A Package colour
B Brand mascot
C Shelf number
D Material and certification
Answer: D. Material and certification. Check material and certification information required by local drinking-water rules.
Which action may be needed after changing a faucet?
A Paint the pipe
B Check for leaks under pressure
C Close the drain vent
D Remove the trap
Answer: B. Check for leaks under pressure. Restore supply carefully and check the fixture and connections for leaks.
How can a threaded joint be sealed?
A Use any glue
B Use compatible sealant as directed
C Wrap with cloth
D Apply paint only
Answer: B. Use compatible sealant as directed. Use a sealant or thread tape only where suitable and follow product instructions.
Where is thread tape generally unsuitable?
A Compression sealing surfaces
B Applicable threaded joints
C Specified pipe threads
D Compatible fittings
Answer: A. Compression sealing surfaces. Thread tape is not a substitute for a compression fitting’s designed sealing surfaces.
What can happen if plumbing connections are overtightened?
A Fittings may crack
B Water becomes sterile
C Pipes get longer
D Drains vent themselves
Answer: A. Fittings may crack. Excessive tightening can crack fittings or damage threads.
Which pipe change may need a qualified plumber?
A Replace a tap aerator
B Clean a sink strainer
C Alter a main supply line
D Tighten a loose handle
Answer: C. Alter a main supply line. Main-line changes can affect pressure, safety, and compliance; use qualified help.
Why should local plumbing codes be checked?
A Requirements differ by place
B They set faucet colour
C They replace product labels
D They apply only to drains
Answer: A. Requirements differ by place. Plumbing requirements vary by jurisdiction and work type.
What should be done before opening a pipe joint?
A Turn water pressure up
B Plug the vent
C Shut supply and drain line
D Heat the pipe
Answer: C. Shut supply and drain line. Isolate and drain the relevant line before opening a connection.
Which part connects a sink basin to its drain?
A Tailpiece
B Wall stud
C Hinge bracket
D Toilet seat
Answer: A. Tailpiece. The tailpiece connects the sink outlet to the trap assembly.
What can cause a toilet tank to keep refilling?
A A dry shelf
B A blocked wall vent
C Faulty fill or flush valve
D A loose door hinge
Answer: C. Faulty fill or flush valve. A faulty fill valve or leaking flapper can cause repeated refilling.
What should be done before replacing a toilet fill valve?
A Shut off its water supply
B Open the drain trap
C Remove electrical wiring
D Cut the floor
Answer: A. Shut off its water supply. Close the toilet supply valve before servicing the tank.
Why should a water heater repair often be left to professionals?
A It uses paint
B It needs no tools
C Pressure, heat, or gas hazards
D It has no stored energy
Answer: C. Pressure, heat, or gas hazards. Water heaters can involve hot water, pressure, electricity, or gas; use qualified service for complex repairs.
What should be done if a pipe bursts?
A Shut main and seek help
B Run all taps
C Cover it with paper
D Turn on nearby power
Answer: A. Shut main and seek help. Shut the relevant supply if safe, protect people from electrical hazards, and call for repair.
Which household plumbing job is generally low risk?
A Replace a gas line
B Alter a main pipe
C Clean a sink strainer
D Open a pressure vessel
Answer: C. Clean a sink strainer. Cleaning a sink strainer is a basic maintenance task compared with gas or main-line work.
What can a faucet aerator do?
A Control flow and catch debris
B Seal a drain trap
C Stop water at meter
D Vent a sewer
Answer: A. Control flow and catch debris. An aerator mixes air with water and may catch small debris.
How should a clogged aerator be maintained?
A Use a power saw
B Pry with a knife
C Follow fixture instructions
D Apply drain cleaner
Answer: C. Follow fixture instructions. Clean or replace an aerator according to the faucet manufacturer’s instructions.
Why should leaks be repaired promptly?
A Limit water damage
B Increase pressure
C Make pipes warmer
D Improve wall colour
Answer: A. Limit water damage. Prompt leak repair helps limit damage and unnecessary water loss.
What may cause water hammer?
A A clogged strainer only
B Paint on the pipe
C Sudden flow stoppage
D A loose shelf
Answer: C. Sudden flow stoppage. Water hammer is a pressure shock associated with abrupt changes in water flow.
What should someone do if water pressure is abnormally high?
A Seek qualified assessment
B Tighten every fitting
C Ignore pipe noise
D Block the drain
Answer: A. Seek qualified assessment. Excessive pressure can stress plumbing; have the system assessed by a qualified professional.
Which material is suitable for drinking-water plumbing?
A Any scrap pipe
B Painted garden hose
C Locally approved potable-rated material
D Unknown recycled tubing
Answer: C. Locally approved potable-rated material. Use materials approved for potable water under applicable local requirements.
What should happen if a repair affects drinking water?
A Flush as directed; check quality
B Assume it is safe
C Add drain cleaner
D Use it before inspection
Answer: A. Flush as directed; check quality. Follow local guidance and product instructions after work on potable-water plumbing.
Who should handle a suspected lead service pipe?
A An untrained helper
B A child
C Qualified local professional
D A paint seller
Answer: C. Qualified local professional. Have suspected lead plumbing assessed by qualified professionals and contact local water authorities.
What is a sensible first response to plumbing uncertainty?
A Consult a qualified plumber
B Force the fitting
C Open unknown valves
D Mix chemicals
Answer: A. Consult a qualified plumber. Pause work when the hazard, material, or system is uncertain and seek qualified help.
Which symptom may signal a drain vent problem?
A A clean faucet
B Dry cabinet shelves
C Gurgling and slow drainage
D A new aerator
Answer: C. Gurgling and slow drainage. Gurgling or slow drainage can have several causes; a qualified plumber can diagnose venting or blockage problems.