Science Bowl

GENERAL SCIENCE

General Science - 17

GENR-92; Multiple Choice:  To reverse the direction of rotation of a three-phase AC induction
motor, do one of the following:

w)  reverse any two of the three-phase connections
x)  change the frequency of the applied AC power
y)  operate the motor below the stall torque at very high slip
z)  none of the above

ANSWER:  W -- REVERSE ANY TWO OF THE THREE-PHASE CONNECTIONS 

GENR-92; Multiple Choice:  What are the three elements of a bipolar transistor?  Are they the:

w)  grid, plate, cathode
x)  suppressor, deflector, target
y)  energizer, controller, terminus
z)  emitter, base, collector

ANSWER:  Z -- EMITTER, BASE, COLLECTOR

GENR-92; Short ANSWER:  W 10 pound bag of fertilizer carries the label 20-6- 
  
   ANSWER:   2  POUNDS

GENR-92; Multiple Choice:  Seawater (i.e. saltwater) freezes at: 

w)  the same temperature as fresh water.
x)  at a slightly higher temperature than fresh water.
y)  at a slightly lower temperature than fresh water. 
z)  seawater does not freeze.

ANSWER:  Y -- AT A SLIGHTLY LOWER TEMPERATURE THAN FRESH
WATER. 

GENR-92; Multiple Choice:  Nitrous oxide, commonly called laughing gas, has been a matter of
concern to environmentalists recently because: 

w)  it is thought to cause cancer at low concentrations.
x)  it produces photochemical smog.
y)  it is a greenhouse gas.
z)  none of the above

ANSWER:  Y -- IT IS A GREENHOUSE GAS.