Traps are used in household drainage system to
- APrevent entry of foul gases in the houseCorrect
- BRestrict flow of water
- CProvide a partial vacuum
- DTrap the solid waste
Solution
Concept
Function of a trap
Step-by-step solution
1. A trap holds a water seal in its bend. 2. The water seal prevents sewer gases from entering the building through the fixture.
Explanation
Traps are fitted below sanitary fixtures. The water retained in the trap forms a seal that stops foul gases of the drainage system from entering the house.
Shortcut
Trap = water seal against foul gas.
Common mistake
Choosing "trap the solid waste".
Correct answer: A) Prevent entry of foul gases in the house