D:-over flow pipe
Correct Answer:- Option-B
Question29:-What type of bacteria treats waste in percolation area?
A:-fungi
B:-anaerobic
C:-aerobic
D:-lime
Correct Answer:- Option-C
Question30:-The cistern which is operated by a chain is called .....
A:-Ball type cistem
B:-Bell type cistem
C:-Pull type cistem
D:-Push type cistemn
Correct Answer:- Option-B
Question31:-Hardness that cannot be removed by boiling the water is called
Acdifficult hardness
B:-stiff hardness
C:-permanent hardness
D:-tough hardness
Correct Answer:- Option-C
Question32:-Galvanized iron is coated with
A:-Copper
B:-Lead
C:-Zinc
D:-Tin
Correct Answer:- Option-C
Question33:-What you should be sure you have in plenty before considering buying a solar water heater
A:-abundant sunshine
B:-very hot water
C:-intermittent rain
D:-all of the above
Correct Answer:- Option-A
Question34:-There are two primary chemicals used to purify water namely .....
A:-iodine and chlorine
B:-sodium and chlorine
C:-chlorine and fluorine
D:-fluorine and iodine
Correct Answer:- Option-A
Question35:-Which material is used for joining 0.1. ೧1೧೯57
A:-Lead and cement
B:-Lead and lead wool
C:-Zinc and lead wool
D:-Copper and hemp yam
Correct Answer:- Option-B
Question36:-What is used at the junction of house sewer and municipal sewer?
A:-nahni trap
B:-P. trap
C:-Intercepting trap
D:S. trap
Correct Answer:- Option-C
Question37:-What is used to overcome siphonic action
A:-anti siphonage pipe
B:-vent pipe
C:-coupler
D:-vent cowl
Correct Answer:- Option-A
Question38:-What happens if cast iron pipes are coated with cool tar
A:-loose strength
B:-prevent corrosion