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91: The Millikan experiment showed that electric charge was:w) Negative
x) Quantized
y) Positive
z) unmeasurable
ANSWER: X – QUANTIZED
92: When a metal becomes a superconductor, there is a tremendous decrease in it’s:
w) Total volume
x) Electrical resistance
y) Length
z) Density
ANSWER: X -- ELECTRICAL RESISTANCE
93: An x-ray photon collides with a free electron, and the photon is scattered. During this collision there is conservation of:
w) Momentum but not energy
x) Neither momentum nor energy
y) Energy but not momentum
z) Both momentum and energy
ANSWER: Z -- BOTH MOMENTUM AND ENERGY
94: In the sun, helium is produced from hydrogen by:
w) Radioactive decay
x) Disintegration
y) Fission
z) Fusion
ANSWER: Z – FUSION Science Bowl PHYSICS
95: The half-life of an isotope of an element is 5 days. The mass of a 10 gram sample of this isotope remaining after 20 days is:
w) 0.312 grams
x) 0.625 grams
y) 1.25 grams
z) 2.50 grams
ANSWER: X -- 0.625 GRAMS
96: The idea that electrons revolved in orbits around the nucleus of an atom without radiating energy away from the atom was postulated by:
w) Thompson
x) Bohr
y) Rutherford
z) Einstein
ANSWER: X – BOHR
97: Alpha particles are nuclei of:
w) Hydrogen
x) Helium
y) Oxygen
z) Nitrogen
ANSWER: X – HELIUM
98: A ball falling vertically from rest for 3 seconds travels very nearly:
w) 14.7 meters
x) 29.4 meters
y) 44.1 meters
z) 88.2 meters
ANSWER: Y -- 44.1 METERS Science Bowl PHYSICS
99: A car is moving along a straight horizontal road at a speed of 20 meters per second. The brakes are applied and a constant force of 5000 Newtons decelerates the car to a stop in 10 seconds. The mass of the car is:
w) 1250 kilograms
x) 2500 kilograms
y) 5000 kilograms
z) 10,000 kilograms
ANSWER: X -- 2500 KILOGRAMS
100: A girl throws a 0.1 kilogram ball at a wall. The ball hits the wall perpendicularly with a velocity of 5 meters per second and then bounces straight back with a velocity of 4 meters per second. The change in the momentum of the ball is:
w) 0.1 kilogram-meters per second
x) 0.4 kilogram-meters per second
y) 0.5 kilogram-meters per second
z) 0.9 kilogram-meters per second
ANSWER: Z -- 0.9 KILOGRAM-METERS PER SECOND
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