Science Bowl

GENERAL SCIENCE

General Science - 43

GENR-93; Multiple Choice:  Consider efficiencies of hydro-turbines and generators. If the
efficiency  of a hydro-turbine is 80% and the efficiency of a generator is 90%, what is the overall
efficiency  of the unit? 

w)  85% 
x)  72% 
y)  90% 
z)  70% 

ANSWER:  X -- 72% 

  
GENR-93; Short Answer:  Name this much publicized group of compounds, of which there are
209  congeners.  It was first discovered as an environmental pollutant in 1966, and its widespread
use  in electrical transformers has spread these compounds into the food chain to such an extent
that  most adults have small concentrations in their fatty tissue. 
  

ANSWER:  PCB's (Accept POLYCHLORINATED BIPHENYL'S) 

 
GENR-93; Multiple Choice:  Recent discoveries of ancient cratering near the Yucatan Peninsula 
support the theory that a meteor or cometary impact may have resulted in mass extinctions of
species on Earth about 65 million years ago.  During which geologic period is that impact thought
to have occurred? 

w)  Permian 
x)  Triassic 
y)  Jurassic 
z)  Cretaceous 

ANSWER:  Z -- CRETACEOUS 

 
GENR-93; Multiple Choice:  In the United States the average number of gallons per person of
fresh  water used per day for personal (non-industrial) use such as bathing, laundering, drinking,
and  the like is approximately: 

w)  10 gallons 
x)  30 gallons 
y)  60 gallons 
z)  90 gallons 

ANSWER:  Z -- 90 GALLONS