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151: The density of seawater is greater than that of fresh water. A boat will float:
w) Higher in fresh water than in seawater
x) Lower in fresh water than in seawater
y) At the same level in both
z) Any of the above, depending upon its shape
ANSWER: X -- LOWER IN FRESH WATER THAN IN SEAWATER
152: How many times more intense is an 80 decibel sound than a 40 decibel sound?
w) 2
x) 40
y) 1000
z) 10,000
ANSWER: Z -- 10,000
153: The coefficient of linear expansion of steel is 1.2 x 10-5/ oC. (Read: 1 point 2 times 10 to the minus 5 per degree Celsius). What is the increase in length of a steel girder that is 20 meters long at 10o C when its temperature is raised to 20o C?
ANSWER: 2.4 MILLIMETERS (accept 0.0024 meters or 2.4 x 10-3 meters)
154: What law describes the force between two stationary electrically charged objects?
w) Ampere's law
x) Coulomb's law
y) Kirchhoff’s Rules (prone: kir-koff rules)
z) Ohm's law
ANSWER: X -- COULOMB'S LAW
155: A circuit has a resistance of 200 ohms. The resistance of the circuit can be reduced to 120 ohms by adding which of the following to the circuit.
w) 80 ohm resistor in series
x) 150 ohm resistor in parallel
y) 240 ohm resistor in series
z) 300 ohm resistor in parallel
ANSWER: Z -- 300 OHM RESISTOR IN PARALLEL
156: A spring with a force constant k is cut into thirds. The force constant of each of the new springs is
w) k
x) 3k
y) (1/3)k (read: one third k)
z) 9k
ANSWER: X -- 3k
157: When a 2 kilogram mass is suspended from a spring, the spring stretches 4 cm. The force constant of the spring is approximately: +
w) .5 Newton’s per meter
x) 5 Newton’s per meter
y) 50 Newton’s per meter
z) 500 Newton’s per meter
ANSWER: Z -- 500 NEWTONS PER METER
158: If a three farad capacitor and a six farad capacitor are connected in parallel, what is their equivalent capacitance?
ANSWER: 9 FARADS
159: Which of the following sets of 3 forces CANNOT have a vector sum of zero?
w) 10, 10 and 10 Newton’s
x) 10, 10 and 20 Newton’s
y) 10, 20 and 20 Newton’s
z) 10, 20 and 40 Newton’s
ANSWER: Z -- 10, 20 AND 40 NEWTONS
160: A small cluster of stars appear, after many decades of observation, to be converging toward a common point in the sky. Does the light from these stars show a:
w) Red Doppler shift
x) Blue Doppler shift
y) No Doppler shift
ANSWER: W -- RED DOPPLER SHIFT
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