Third Quarterly Exam Practice Questions

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1. A sphere has a negative charge of 6.4 x 10-7 C. How many electrons must be removed to make the sphere
neutral ?
1.6 x 10-8 9.8 x 105 6.4 x 1026 4.0 x 1012

2. Three 3.0 ohm resitors are connected in parallel. What is their equivalent resistance ?
1.0 ohm 3.0 ohms 9.0 ohms 0.33 ohms

3. The resultant of two forces acting on the same point at the same time will be greatest when the angle
between the forces is
0 degrees 45 degrees 90 degrees 180 degrees

4. What is the weight of a 5.0 kg object at the surface of the earth ?
5.0 kg 25 N 49 N 49 kg

5. Energy is measured in the same units as
force momentum work power

6. If the length of a copper wire is reduced by half, the resistance of the wire will be
halved doubled quartered quadrupled

7. Three resistors of 1, 2, and 3 ohms are connected in series to a 6 V battery. What is the current in this circuit ?
1 A 2 A 3 A 6 A

8. A student drops an object from the top of a building which is 19.6 m from the ground. How long does it take
the object to fall to the ground ?
19.6 s 2.00 s 3.00 s 4.00 s

9. Two point masses that are equal are separated by a distance of 1 m. If one mass is doubled, the gravitational
force between the two masses would be
one-half as great two times greater one-fourth as great four times greater

10. An impulse X is applied to an object. The change in momentum of the object is
X 2X X/2 4X

11. A weightlifter lifts a 2000 N weight a vertical distance of 0.5 m in 0.1 s. What is the power output ?
1 x 10^-4 W 4 x 10^-4 W 1 x 10^4 W 4 x 10^4 W

12. A flow rate of 1 C per 0.1 second is measured in a wire. What is the electrical current in the wire ?
1 A 0.1 A 10 A 100 A

13. An unbalanced force of 10 N acts on a 20 kg mass for 5 seconds. The acceleration of the mass is
0.5 m/s^2 2 m/s^2 40 m/s^2 200 m/s^2

14. Ten joules of work are done in accelerating a 2.0 kg mass from rest across a horizontal frictionless table.
The total kinetic energy gained by the mass is
3.2 J 5.0 J 10. J 20. J

15. If the current in a wire is 2.0 A and the potential difference across the wire is 10. V, what is the wire's resistance ?
5.0 ohms 8.0 ohms 12 ohms 20 ohms

16. As shown in the diagram below, a charged rod is held near, but not touching, a neutral electroscope.

U6ExamImage3.gif (3401 bytes)

The charge on the knob is
+ and leaves + + and leaves - - and leaves + - and the leaves -

17. The diagram below represents two small identical charged spheres located 2.00 meters apart.

U6ExamImage5.gif (4814 bytes)

The force between these spheres is
1.80 x 10-2 N 3.60 x 10-2 N 4.50 x 10-2 N 9.00 x 10-2 N




Base your answers to questions 18 through 22 on the diagram below which shows a rock being thrown off a cliff with an initial horizontal velocity of 20. m/s east. (Disregard air resistance)

U11Image1.gif (4943 bytes)


18. How long does it take the rock to hit the ground ?
4.5 s  20. s  2.0 s  3.2 s

19. What is the initial vertical component of the rock's velocity ?
0 m/s  5.0 m/s  10. m/s  20.  m/s

20. What is the horizontal speed of the rock after falling for 1.0 s ?
1.0 m/s  100 m/s  20. m/s  9.8  m/s

21. What is the vertical speed of the rock after falling for 1.0 s ?
1.0 m/s  100 m/s  20. m/s  9.8 m/s

22. If the rock were thrown off the cliff at 40. m/s east, what would increase ?
vertical acceleration  time in the air  horizontal distance

 

Base your answers to questions 23 and 24 on the diagram below which shows a satellite orbiting the earth.

U11Image2.gif (6436 bytes)

23. Toward which letter does the centripetal acceleration of the satellite point ?
A  B  C  D

24. Toward which letter does the velocity of the satellite point ?
A  B  C  D

Base your answers to questions 25 through 28 on the circuit diagram below.

U7ExamImage1.gif (5891 bytes)

25. The potential difference across R2 is
12 V 24 V 6.0 V 2.0 V

26. The current through R1 is
2.0 A 4.0 A 0.5 A 8.0 A

27. The equivalent resistance of the circuit is
3.0 W 16 W 24 W 4.0 W

28. The current through the ammeter is
2.0 A 4.0 A 0.5 A 8.0 A

Base your answers to questions 29 and 30 on the circuit diagram below.

U7ExamImage2.gif (7550 bytes)

29. At which position should an ammeter be placed to measure the current passing only through resistor R1 ?
1 2 3 4

30. If R1 has a greater resistance than R2, how do the voltage drops across R1 and R2 compare ?
voltage drop across R1 is greater voltage drop across R2 is greater they are the same

Base your answers to questions 31 and 32 on the circuit diagram below.

U7ExamImage3.gif (5277 bytes)

31. The resistance of R equals
2.0 W 3.0 W 4.0 W 0.25 W

32. The rate at which R consumes electrical energy is
110 W 36 W 24 W 4.0 W

Base your answers to questions 33 and 34 on the diagram below.

U7Q4Image2.gif (7742 bytes)

33. What is the direction of the magnetic field at point x due to the current in section EF ?
into the page out of the page to the left to the right

34. The north pole of the solenoid is closest to
A B C D

Base your answers to questions 35 through 37 on the diagram below which shows a toy airplane traveling in a circular path.

U11Image3.gif (7423 bytes)

35. What is the centripetal force acting on the toy airplane ?
12 N  3 N  2 N  24 N

36. If only the mass of the toy airplane were doubled, what would happen to the centripetal acceleration ?
it would be halved  it would double  it would be quartered  it would be unchanged

37. What is the direction of the centripetal acceleration of the toy airplane ?
north  south  east  west


Base your answers to questions 38 through 43 on the speed-time graph below representing the motion of a cart.



38. The cart travels the shortest distance in interval
0-5 s 5-8 s 8-11 s 11-16 s

39. The cart’s average speed is greatest during interval
0-5 s 5-8 s 8-11 s 11-16 s

40. The cart travels the greatest distance during interval
0-5 s 5-8 s 8-11 s 11-16 s

41. The magnitude of the cart’s acceleration is greatest during interval
0-5 s 5-8 s 8-11 s 11-16 s

42. During how many intervals is the cart’s acceleration equal to zero ?
1 2 3 4

43. What is the distance traveled by the object during the time interval 8 to 11 seconds ?
30 m 60 m 90 m 180 m

 



44. An object initially traveling in a straight line with a speed of 5.0 m/s is accelerated at 2.0 m/s2 for 4.0 s. The total distance traveled is
36 m 24 m 16 m 4.0 m

Base your answers to questions 45 through 47 on the distance-time graph below representing the motion of an object.



45. What is the average speed of the object between 3 and 7 seconds ?
10. m/s 2.5 m/s 5.0 m/s 15 m/s

46. What is the average speed of the object between 7 and 9 seconds ?
10. m/s 2.5 m/s 5.0 m/s 0 m/s

47. During which interval is the object’s speed greatest ?
1 – 3 s 3 – 7 s 7 – 9 s 9 – 12 s