The major disadvantage of detergent over soap is that it……………
a) biodegradable
b) non-biodegradable
c) both a & b
d) none of these
Microorganisms like bacteria cannot decomposes……………
a) soap
b) paints
c) wood
d) detergent
Microorganism can easily decomposes………
a) paints
b) soap
c) wood
d) detergents
Waste water consists of water used in.………
a) kitchens
b) washrooms
c) cleaning floor
d) all of these
Flushed water mostly contain…………….
a) pathogens
b) oil
c) soap
d) wood
Solid waste is also called…………..
a) urban waste
b) domestic waste
c) both a & b
d) waste water
