Unit 8: Programming the Robot - Practice Quiz

1 What is the main purpose of color identification programming in a robot?

2 Which component commonly helps a robot identify colors?

3 What does a robot usually do after detecting a specific color?

4 In a color identification program, what is a color condition used for?

5 If the U-BOT is programmed to stop when it sees red, what happens when red is detected?

6 Why should the color sensor be placed correctly during testing?

7 What is calibration in color identification?

8 What is the purpose of shape identification programming?

9 Which shape is commonly used as a basic example in shape identification?

10 What information can help a robot identify a shape?

11 What should a shape identification program do when it recognizes a square?

12 Why are different shapes used in a robot programming activity?

13 Which program structure is useful for responding to different shapes?

14 What is one possible result of incorrect shape recognition?

15 What is the main goal of path tracking?

16 Which sensor is commonly used for line or path tracking?

17 What does the U-BOT compare while tracking a line?

18 How can a two-wheel robot correct its direction during path tracking?

19 If the U-BOT moves away from the path to the left, what may the program do?

20 Why is testing important in U-BOT path tracking?

21 U-BOT reads an RGB value of from an object. To reduce sensitivity to overall brightness, the program normalizes each channel by . What normalized RGB value is obtained?

22 A color-identification program works correctly indoors but misclassifies the same objects near a window. Which modification is most appropriate?

23 U-BOT must distinguish a yellow marker from a white marker. Both produce high red and green readings. Which additional feature is most useful?

24 While U-BOT observes a stationary blue object, individual frames are classified as blue, blue, green, blue, and blue. Which decision method gives the most reliable result?

25 A program checks if red is high before checking whether both red and green are high. Yellow objects are therefore reported as red. What is the best correction?

26 A dark blue card produces very low readings in all three RGB channels, causing U-BOT to label it black. Which change would best improve identification?

27 U-BOT should stop when a red marker is detected, but sensor noise makes the measured value repeatedly cross the red threshold. Which programming technique best prevents rapid switching?

28 U-BOT calculates contour circularity using . For a contour with pixels and pixels, what is the approximate circularity?

29 A detected object's axis-aligned bounding box is pixels wide and pixels high. If a square is expected to have an aspect ratio near , how should this object be classified?

30 A binary image used by U-BOT contains many isolated foreground pixels around the actual shape. Which operation should be applied first to remove these small objects?

31 U-BOT expects a shape marker with an area near pixels. Detected contours have areas of , , and pixels. Which contour should be analyzed?

32 The same triangle appears at different sizes as U-BOT moves toward it. Which feature is most suitable for maintaining the same classification?

33 A square is correctly recognized when upright but is classified as a different shape after being rotated by . Which improvement is most appropriate?

34 Five line sensors have position weights . Their binary readings are , where indicates the line. Using the weighted average, what is the line error?

35 U-BOT uses for steering. A positive error means the path is to the robot's right. Which motor command turns the robot toward the path?

36 During line following, U-BOT repeatedly swings from one side of the path to the other while its forward speed remains fixed. What is the best initial controller adjustment?

37 On a sharp curve, all of U-BOT's line sensors briefly detect the background. Which recovery behavior is most effective?

38 U-BOT must take the second left turn encountered on a path. Which program design is most reliable?

39 During calibration, a line sensor reads over a black path and over a white floor. Using the midpoint threshold, how should a reading of be classified?

40 A path-tracking loop pauses for ms whenever U-BOT performs color or shape recognition. The robot then leaves the path. Which software change best addresses the problem?

41 A U-BOT must identify red, green, and blue objects under changing room illumination. Which programming strategy is most robust?

42 A color sensor produces noisy readings near the boundary between yellow and green. Which modification most directly prevents rapid switching between labels?

43 The U-BOT identifies a red object correctly in isolation but labels it as black when it is partially shadowed. Which decision rule is most appropriate?

44 A U-BOT scans an object five times and obtains the labels red, red, green, red, and red. Which action best balances noise rejection and response time?

45 When calibrating the U-BOT for color identification, why should reference samples be collected at the same sensor distance and angle used during operation?

46 A color-identification routine returns a valid label even when the sensor is pointed at the floor. Which safeguard is most important?

47 The U-BOT detects the boundary of an object by moving its sensor laterally. Which feature is most useful for distinguishing a circle from a square when both have similar areas?

48 A rectangular object is rotated by before scanning. Which shape-recognition method is least affected by this rotation?

49 Two objects have identical perimeter measurements, but one is a circle and the other is a square. Which additional measurement provides the strongest discrimination?

50 During a shape scan, the U-BOT misses one corner because of a noisy sensor reading. Which algorithmic change best preserves recognition accuracy?

51 A U-BOT must distinguish triangles from squares using a one-dimensional edge scan. Which scan interpretation is most defensible?

52 A shape classifier performs well on large objects but fails on smaller versions of the same shapes. Which correction is most appropriate?

53 While following a dark line, the U-BOT oscillates across the path at high speed. Which control adjustment most directly reduces the oscillation?

54 For a two-sensor line-following program, both sensors detect white after a sharp turn. What should the recovery behavior use first?

55 A line-tracking controller uses error . Which motor response is consistent with correcting a positive error while moving forward?

56 The line width varies along the course, causing a binary sensor pair to produce inconsistent states. Which design is most robust?

57 At a path intersection, the U-BOT must turn left only when a junction is detected. Which software structure best prevents accidental turns caused by a brief sensor spike?

58 A U-BOT tracks a line accurately at low speed but loses it on curves at high speed. Which combined change is most justified?

59 The U-BOT repeatedly overshoots a left turn, although its sensors are calibrated correctly. Which diagnosis is most likely?

60 A path-tracking program must resume after a temporary sensor failure. Which implementation best maintains predictable behavior?