Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 947 · 40 questions

Robot tip (Find the topic, use the formula): Find the topic: moving, motors, gears, wheels, sensors, echo, line or gyro. Use the rule: teeth × turns; circumference × turns; 17 cm per ms of echo; below the threshold = black; right adds degrees. Check: put your answer back into the rule.

1. 1.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and left (b) points up and right (c) points straight up (d) points right
3. 3.🧭 A robot should turn right 45°, but its gyro shows it turned 43°. How many degrees must it turn more to the right?
4. 4.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they never tire (c) they are too cheap (d) harder to balance
5. 5.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
6. 6.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the left sensor (c) far behind it (d) under the right sensor
7. 7.True or false: “stepping over wide gaps” suits wheels. (a) False (b) True
8. 8.Which job needs a distance sensor? (a) start on a hand clap (b) measure a turn angle (c) stop before a wall (d) find the brightest spot
9. 9.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a soft foam cushion (c) a metal door (d) a flat wall
10. 10.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a caster wheel (c) a gear (d) a servo
11. 11.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
13. 13.True or false: “a flat road” suits wheels. (a) False (b) True
14. 14.🧭 What does a gyro help a robot do? (a) hear claps (b) see colours (c) smell smoke (d) turn by exact angles
15. 15.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 0°. It turns left 135°, then left 135°. What does the gyro read now (0° to 359°)?
17. 17.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its radius (d) its weight
18. 18.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) legs (c) tracks (d) propellers
19. 19.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
20. 20.⚙️ A motor makes 550 turns a minute with a 20-tooth gear on it. That gear drives a 100-tooth gear. How many turns a minute does the 100-tooth gear make?
21. 21.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 58. What is under the sensor? (a) the white floor (b) the black line
22. 22.⬛ The threshold of a light sensor is … (a) the battery size (b) the top speed (c) the wheel size (d) the black/white cut-off
23. 23.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
24. 24.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) one up, one down (c) in opposite directions (d) the same direction
25. 25.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black is hot (d) black soaks up light
26. 26.True or false: to hear a whistle, use a light sensor. (a) False (b) True
27. 27.🔍 Why do robots need sensors? (a) to know their world (b) to be heavier (c) to look colourful (d) to use more power
28. 28.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and right (b) points straight up (c) points right (d) points up and left
29. 29.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle − 20
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
31. 31.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 25. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
33. 33.🧭 How many degrees is a full turn? (a) 90° (b) 100° (c) 360° (d) 180°
34. 34.🦾 A servo moves from 160° to 40°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 140
    angle = angle + 30
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
37. 37.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
38. 38.🔍 What does a gyro sensor measure? (a) temperature (b) sound (c) turning (rotation) (d) colour
39. 39.True or false: “crossing stepping-stones” suits legs. (a) False (b) True
40. 40.🔍 Which sensor helps a robot hear a whistle? (a) a distance sensor (b) a gyro sensor (c) a sound sensor (d) a touch sensor

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