Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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A car traveling at 20 m/s decelerates at the rate of 4 m/s2.
After 2 seconds the speed of the car is
A) | 28 m/s | B) | 16 m/s | C) | 12
m/s | D) | - 8 m/s |
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2.
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A jogger runs 4 km east, 6 km south, 8 km west and 6 km north. What is the
magnitude of the jogger’s displacement?
A) | 8 km | B) | 24 km | C) | 4
km | D) | 16 km |
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3.
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A moving object will travel in a circle if acted upon by a force
A) | opposite to its direction of motion. | B) | perpendicular to its direction of
motion. | C) | in its direction of motion. | D) | tangent to its circular
path. |
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4.
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Newton’s third law is a statement of the law of
A) | gravitation | B) | inertia | C) | force | D) | action-reaction |
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5.
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A scientific model
A) | must be changed annually. | B) | is a useful conceptual
tool. | C) | is a representation of ultimate reality. | D) | is constructed of
sticks of balls. |
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6.
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A net force is acting on a body; therefore the body is
A) | being accelerated. | B) | losing mass. | C) | moving with a
constant velocity. | D) | at rest. |
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7.
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How many kg are there in 1 mg?
A) | 1x106 kg | B) | 1x10-6 kg | C) | 1000
kg | D) | 1x10-3 kg |
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8.
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A car traveling at 30 m/s is brought to stop in 5 seconds. What is the
car’s acceleration?
A) | 150 m/s2 | B) | –6 m/s2 | C) | 6
m/s2 | D) | 30 m/s2 |
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9.
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The measurement 0.00630 cm has how many significant figures?
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10.
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An object with a mass of 25 kg is acted upon by a force of 10 N. The
object’s acceleration is
A) | 0.4 m/s2 | B) | 35 m/s2 | C) | 250
m/s2 | D) | 2.5 m/s2 |
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11.
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Ethyl alcohol has a density of 0.789 g/mL. What is the mass of 250
mL of this alcohol?
A) | 250 g | B) | 317 g | C) | 171
g | D) | 197 g |
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12.
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The temperature of 77 F is what temperature in Celsius?
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13.
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Which of the following is not a vector?
A) | displacement | B) | speed | C) | acceleration | D) | velocity |
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14.
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For an object in free fall,
A) | the distance increases uniformly with time. | B) | the acceleration
increases uniformly with time. | C) | the velocity increases uniformly with
time. | D) | none of the above is true |
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15.
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The gravity of planet X is three times that on the earth. What mass would
an object have on planet X if its mass is 5 kg on earth?
A) | 45 kg | B) | 15 kg | C) | 135
kg | D) | 5 kg |
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