Units 08–09 Cumulative Chapter Test

1. [Unit 08] Which record is complete?

1. 5 metres east in 2.0 seconds
2. Fast motion
3. A long time
4. 5

2. [Unit 08] Which is a vector?

1. Time
2. Force
3. Energy
4. Distance

3. [Unit 08] 150 m in 30 s equals:

1. 4500 m/s
2. 3 m/s
3. 5 m/s
4. 30 m/s

4. [Unit 08] A displacement of −24 m in 6 s gives average velocity:

1. 4 m/s
2. −18 m/s
3. 144 m/s
4. −4 m/s

5. [Unit 08] The slope of a velocity–time graph gives:

1. Acceleration
2. Power
3. Force
4. Displacement

6. [Unit 08] Velocity is 4 m/s for 5 s. Displacement is:

1. 9 m
2. 20 m
3. 0.8 m
4. 4 m

7. [Unit 08] Velocity changes from −3 to +5 m/s in 4 s. Acceleration is:

1. 0.5 m/s²
2. −2 m/s²
3. +2 m/s²
4. +8 m/s²

8. [Unit 08] Ignoring air resistance near Earth, free-fall acceleration is approximately:

1. 98 m/s²
2. 1 N
3. 0.98 m/s²
4. 9.8 m/s²

9. [Unit 08] A 7 N left force and 13 N right force produce:

1. 6 N right
2. 6 N left
3. 20 N right
4. 91 N right

10. [Unit 08] An object is in translational equilibrium when:

1. Mass is zero
2. Net force is zero
3. Velocity is zero only
4. No forces exist

11. [Unit 08] A 2.5 kg object under 10 N net force accelerates at:

1. 25 m/s²
2. 2.5 m/s²
3. 4 m/s²
4. 12.5 m/s²

12. [Unit 08] For fixed acceleration, tripling mass requires:

1. Zero force
2. One-third the force
3. The same force
4. Three times the net force

13. [Unit 08] A 12 kg mass near Earth weighs approximately:

1. 117.6 N
2. 1200 N
3. 1.22 N
4. 12 N

14. [Unit 08] A spacecraft coasts far from significant external forces. It:

1. Loses mass
2. Continues at constant velocity
3. Stops because force ends
4. Accelerates automatically

15. [Unit 08] Third-law forces:

1. Require contact only
2. Act on the same object and cancel
3. Act on different objects
4. Have unequal magnitudes

16. [Unit 08] Which statement is accurate?

1. Friction always speeds objects
2. Friction acts only on stationary objects
3. Friction creates energy
4. Friction can transfer mechanical energy into thermal energy

17. [Unit 08] A 0.5 kg ball moves at 8 m/s. Momentum is:

1. 4 kg·m/s
2. 8 kg·m/s
3. 16 kg·m/s
4. 64 kg·m/s

18. [Unit 08] A force of 25 N acts for 0.2 s. Impulse is:

1. 0.008 N·s
2. 5 N·s
3. 25.2 N·s
4. 125 N·s

19. [Unit 08] Two carts have total momentum 6 kg·m/s before an isolated collision. Afterward total is:

1. 0
2. 3 kg·m/s
3. 6 kg·m/s
4. Depends on kinetic energy only

20. [Unit 08] A crumple zone lowers average force mainly by:

1. Increasing speed
2. Increasing mass
3. Eliminating momentum
4. Increasing stopping time for a given momentum change

21. [Unit 08] A 15 N force moves an object 4 m along the force. Work is:

1. 60 J
2. 75 J
3. 3.75 J
4. 19 J

22. [Unit 08] A 4 kg object at 5 m/s has KE:

1. 20 J
2. 50 J
3. 100 J
4. 10 J

23. [Unit 08] A 2 kg object rises 5 m at g=9.8 N/kg. GPE increase is:

1. 9.8 J
2. 49 J
3. 98 J
4. 196 J

24. [Unit 08] Gravitational potential energy near Earth belongs to:

1. The object alone in all models
2. Time
3. The ruler
4. The object–Earth system

25. [Unit 08] A pendulum slows because of air resistance. Its initial mechanical energy is mainly transferred to:

1. Thermal energy and sound in the system/surroundings
2. Nothing
3. New atoms
4. Extra mass

26. [Unit 08] A machine does 2400 J in 30 s. Power is:

1. 72,000 W
2. 80 W
3. 720 W
4. 2370 W

27. [Unit 08] Useful output 180 J from input 300 J gives:

1. 480%
2. 40%
3. 60%
4. 120%

28. [Unit 08] An ideal lever can reduce required force by:

1. Creating energy
2. Reducing output work below zero
3. Ignoring conservation
4. Increasing effort distance

29. [Unit 08] Which is responsible?

1. A free-body diagram simplifies an object and external forces; it is not a photograph
2. Graph curves are literal hills
3. Vectors require no reference direction
4. Equations remove need for measurement

30. [Unit 08] Which action is prohibited?

1. Calculating energy from measured mass and speed
2. Testing stopping distances on a public road
3. Using a tabletop cart
4. Analyzing video supplied by an instructor

31. [Unit 09] 3 A flows for 4 s. Charge is:

1. 0.75 C
2. 7 C
3. 12 C
4. 24 C

32. [Unit 09] 18 J transferred to 6 C gives:

1. 6 V
2. 12 V
3. 108 V
4. 3 V

33. [Unit 09] 9 V and 0.3 A give resistance:

1. 30 Ω
2. 2.7 Ω
3. 9.3 Ω
4. 27 Ω

34. [Unit 09] A 12 V, 2 A device uses:

1. 14 W
2. 24 W
3. 144 W
4. 6 W

35. [Unit 09] A 60 W device runs 120 s. Energy is:

1. 0.5 J
2. 180 J
3. 7200 J
4. 7200 W

36. [Unit 09] 3 Ω, 5 Ω, and 7 Ω in series equal:

1. 105 Ω
2. 5 Ω
3. 10 Ω
4. 15 Ω

37. [Unit 09] A parallel circuit’s total resistance is:

1. Less than the smallest branch
2. Always zero
3. The sum of branches
4. Greater than every branch

38. [Unit 09] 5 A enters; 2 A leaves one branch. Other branch current is:

1. 2.5 A
2. 3 A
3. 5 A
4. 7 A

39. [Unit 09] A curved I–V graph indicates:

1. No current
2. Perfect proportionality
3. Resistance changes over the range
4. Resistance is always zero

40. [Unit 09] Which is safe?

1. Opening a power strip
2. Touching bare mains wires
3. Shorting a 9 V battery
4. Using an approved 3 V circuit kit with a resistor

41. [Unit 09] Field lines around a bar magnet are:

1. A representation of direction and relative strength
2. Electron orbits
3. Sound paths
4. A physical substance

42. [Unit 09] Force on a current-carrying wire depends on:

1. No interaction
2. Current and magnetic field
3. Only wire color
4. Only mass

43. [Unit 09] Increasing rate of flux change generally:

1. Creates mass
2. Stops current everywhere
3. Increases induced potential difference
4. Eliminates induction

44. [Unit 09] A step-up transformer ideally increases voltage while:

1. Creating energy
2. Working on steady DC
3. Increasing both without limit
4. Decreasing current for similar power transfer

45. [Unit 09] A 300 m/s wave at 150 Hz has wavelength:

1. 2 m
2. 150 m
3. 45000 m
4. 0.5 m

46. [Unit 09] Frequency 20 Hz means period:

1. 400 s
2. 0.05 s
3. 0.2 s
4. 20 s

47. [Unit 09] When light enters glass from air, its speed:

1. Must stay identical
2. Increases
3. Decreases
4. Becomes zero

48. [Unit 09] Across a boundary, frequency is:

1. Always doubled
2. Always halved
3. Zero
4. Set by source and stays constant

49. [Unit 09] Longer wavelengths generally diffract:

1. More strongly for the same opening
2. Less strongly always
3. Not at all
4. Only in vacuum

50. [Unit 09] Which change raises pitch?

1. Longer exposure
2. Higher frequency
3. Higher amplitude only
4. Greater distance

51. [Unit 09] Safe sound evaluation must consider:

1. Color only
2. Mass only
3. Level, duration, frequency, distance, and individual context
4. Frequency only

52. [Unit 09] Which sequence is increasing frequency?

1. Visible → infrared → microwave → radio
2. Gamma → X-ray → UV → visible
3. Microwave → radio → infrared → visible
4. Radio → microwave → infrared → visible

53. [Unit 09] Higher-frequency electromagnetic radiation has:

1. Higher photon energy
2. Lower photon energy always
3. Same photon energy
4. No photons

54. [Unit 09] Interference is strongest evidence for:

1. Series resistance
2. Wave behavior
3. Ohm’s law
4. Charge conservation

55. [Unit 09] Photoelectric evidence is explained using:

1. Series circuits
2. Classical rays alone
3. Quantized photons
4. Only sound waves

56. [Unit 09] If sampling frequency is too low:

1. Reconstruction is guaranteed
2. Noise disappears
3. Bandwidth becomes infinite
4. Aliasing or information loss can occur

57. [Unit 09] Parity is a form of:

1. Error detection
2. Encryption
3. Wave speed control
4. Resistance

58. [Unit 09] Which statement is accurate?

1. Digital transmission cannot be copied
2. Digital storage supports reliable copying but raises privacy and energy concerns
3. Digital data have infinite precision
4. Digital systems use no energy

59. [Unit 09] A complete communication system includes:

1. Only a wire
2. Only a battery
3. Source, encoding, channel, receiver, and decoding
4. Only a source

60. [Unit 09] Which action is prohibited?

1. Using a printed spectrum chart
2. Analyzing a recorded signal
3. Using a low-voltage model circuit
4. Pointing a laser at eyes or reflective surfaces