Physics MCQ series - 15

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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