General Science-78

     1.      Radioisotopes which are used in medical diagnosis are known as what?

a.      Tracers

b.      silver bullets

c.        markers

d.      Dyes

     2.      Most commercial nuclear power plants worldwide are cooled by:

a.       Sodium

b.      Mercury

c.       Helium

d.      Water

      3.      What substance is used as a moderator for the chain reaction in the nuclear reactor?

a.      Graphite

b.      Boron

c.       Water

d.      Cadmium

      4.      Which of the following materials is used along with iron ore and limestone to produce iron in a modern blast furnace?

a.      Coke

b.      Cementite

c.       Coal

d.      Bauxite

      5.      What range of frequencies are usually referred to as audio frequencies for humans?

a.       0 to 20 Hertz

b.      20 to 20,000 Hertz

c.       200 to 200,000 Hertz

d.      10,000 to 30,000 Hertz

     6.      A device used to measure the amount of moisture in the atmosphere is called a:

a.      hydrometer

b.      hygrometer

c.       anemometer

d.      barometer

     7.      A barn is a unit of

a.       Length

b.      Area

c.       Volume

d.      Weight

     8.      A light-year can be converted into

a.      astronomical units

b.      hours

c.       foot-candles

d.      ergs

     9.      Which is the longest?

a.       a kilometer

b.      a centimeter

c.       a dekameter

d.      a tetrameter

     10.  You use a hydrometer to check the condition of the electrolyte in your car battery. It is actually measuring what property of the fluid?

a.       Charge

b.      Density

c.       Temperature

d.       surface tension

    11.  If a scuba diver suffers from the "bends", this means that which gas is being rapidly released from the blood and tissues?

a.       Oxygen

b.      Hydrogen

c.       Nitrogen

d.      CO2

    12.  When petroleum is refined it is subject to a number of processes including cracking. During the cracking process

a.       lighter hydrocarbons are combined to form heavier ones

b.      heavy hydrocarbons are broken up into lighter ones

c.       lighter hydrocarbons are separated by distillation

d.      oxygen is used to burn the heavier hydrocarbons

    13.  One metal dissolved in another is called

a.      an alloy

b.      an assay

c.       a mineral

d.      a ceramic

    14.  An alloy consisting mainly of tin and lead is called:

a.       Brass

b.      Bronze

c.       Pewter

d.      Chrome

    15.  The process by which a substance absorbs moisture upon exposure to the atmosphere is called:

a.       Efflorescence

b.      Deliquescence

c.       Dehydrogenation

d.      Desalination

     16.  "Fool's gold" is a common name for this mineral:

a.       Halite

b.      Cinnabar

c.       Magnetite

d.       Pyrite

     17.  Which two gases are used to disinfect water in sewage treatment facilities?

a.       helium and nitrogen

b.      ozone and chlorine

c.       oxygen and hydrogen

d.      nitrogen and chlorine

     18.  What naturally occurring radioactive The estrogen and androgen hormones which regulate sexual development and function are structurally related to:

a.       beta carotene

b.      ethanol

c.       adrenaline

d.      cholesterol

     19.  The most abundant organic molecule on the surface of the Earth is:

a.      Cellulose

b.      Chitin

c.       DNA

d.      Hemoglobin

     20.  In daylight the human eye is most sensitive to which color?

a.      Green

b.      Red

c.       Blue

d.       Orange