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141: One of the following is a device that detects charged particles but does NOT show their tracks. Is this device the:
w) Spark chamber
x) Photographic plate
y) Scintillation counter
z) Bubble chamber
ANSWER: Y -- SCINTILLATION COUNTER
142: The photomultiplier tube in the scintillation counter multiplies one of the following. Does it multiply?
w) Scintillations
x) Electrons
y) Ions
z) Photons
ANSWER: X – ELECTRONS
143: The emission of a positron from a radioactive atom is generally accompanied by the emission of one of the following. Is it accompanied by the emission of?
w) A meson
x) A baryon
y) An anti-neutrino
z) A neutrino
ANSWER: Z -- A NEUTRINO
144: What term refers to the heat needed to change a unit mass of a substance at its melting temperature from a solid into a liquid?
ANSWER: HEAT OF FUSION or LATENT HEAT OF FUSION or ENTHALPY OF FUSION
145: The gravitational constant for the universe was measured by which of the following?
w) Kepler
x) Einstein
y) Newton
z) Cavendish
ANSWER: Z – CAVENDISH
146: If you start with 24 grams of a radioactive element with a half-life of one month, how many grams of the radioactive element will be left after 2 months?
w) 1.5 grams
x) 3 grams
y) 6 grams
z) 12 grams
ANSWER: Y -- 6 GRAMS
147: How many colors of quarks are believed to exist? Is it:
w) 1
x) 3
y) 5
z) 7
ANSWER: X – 3
148: A train is traveling 20 kilometers per hour. It is .5 kilometers behind you. You want to beat the train to a crossing that is .5 kilometers away. How fast must you run?
ANSWER: 10 KILOMETERS PER HOUR
149: A child weighing 50 Newton’s is on a swing. He goes from a minimum height of 0.2 meters to a maximum height of 1.5 meters. His maximum speed is closest to:
w) 3 meters per second
x) 5 meters per second
y) 7 meters per second
z) 9 meters per second
ANSWER: X -- 5 METERS PER SECOND
150: A train locomotive whose mass is 1 x 106 kilograms is traveling EAST at a speed of 100 kilometers per hour. A NORTHERLY wind is applying a force of 100 Newton’s on the locomotive. How much work is the wind doing on the locomotive for each 10 meters it travels?
w) 0 joules
x) 1,000 joules
y) 10,000 joules
z) 100,000 joules
ANSWER: W -- 0 JOULES
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