Name:    Practice Test 1A

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.

1.

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

2.

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

3.

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.

4.

Newton’s third law is a statement of the law of
 A) gravitation B) inertia C) force D) action-reaction

5.

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.

6.

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.

7.

How many kg are there in 1 mg?
 A) 1x106 kg B) 1x10-6 kg C) 1000 kg D) 1x10-3 kg

8.

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

9.

The measurement 0.00630 cm has how many significant figures?
 A) 4 B) 2 C) 3 D) 5

10.

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

11.

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

12.

The temperature of 77 F is what temperature in Celsius?
 A) 43 B) 298 C) 15 D) 25

13.

Which of the following is not a vector?
 A) displacement B) speed C) acceleration D) velocity

14.

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

15.

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