Quiz[ Dev Hooda ]

A pipe open at both ends produces a note of fundamental freq f1 when the pipe is kept (1/3) of its length in water it produces a note freq (f2) the value of {f1/f2} is

A ball of mass 4kg velocity 3m/s collides elastically head on with ball of mass 6 kg at rest find ratio of final V2/V1

n-p-n transistor can be used as

2 main structural features of ecosystem

Researchers have put an avg price tag of us $ __ trillion a year on on the fundamental ecosystem services

Reservoir of Phosphorus can be

Natural reservoir of P is

4*10^x kg CO2 is fixed annually in the biosphere through photosynthesis ( x= )

Dry weight if organism constitute _ % of carbon

__% of CO2 IS dissolved in in oceans

Biogeochemical cycle is

Amount of nutrient present in soil at given time is called

Earliest stage of succession from the following

Lichens the pioneer species pave the way for small plant like