Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 906 · 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.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
2. 2.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 65. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
5. 5.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) they do not turn (c) in opposite directions (d) the same direction
6. 6.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 20. What is under the sensor? (a) the black line (b) the white floor
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
8. 8.🧭 A robot faces east. It does: turn left, turn around. Which way does it face now? (a) west (b) east (c) south (d) north
9. 9.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times bigger (c) 3 times slower (d) 3 times louder
10. 10.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
11. 11.Which of these suits legs? (a) flying over a field (b) moving under water (c) hovering over a roof (d) crossing stepping-stones
12. 12.Which of these suits propellers? (a) a smooth classroom floor (b) a long factory floor (c) crossing stepping-stones (d) moving under water
13. 13.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) spokes (c) pins (d) tyres
14. 14.True or false: to spot a red ball, use a camera. (a) True (b) False
15. 15.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a camera (c) a touch sensor (d) a sound sensor
16. 16.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
17. 17.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
18. 18.🧭 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 270°. It turns left 90°, then right 45°, then right 120°. What does the gyro read now (0° to 359°)?
19. 19.⬛ The threshold of a light sensor is … (a) the wheel size (b) the battery size (c) the top speed (d) the black/white cut-off
20. 20.True or false: to follow a black line, use a sound sensor. (a) True (b) False
21. 21.🧭 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 180°. It turns left 120°, then left 135°, then left 120°. What does the gyro read now (0° to 359°)?
22. 22.True or false: “deep mud” suits tracks. (a) True (b) False
23. 23.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 50
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
24. 24.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
25. 25.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
26. 26.🔍 Which sensor helps a robot stop before a wall? (a) a light sensor (b) a sound sensor (c) a distance sensor (d) a temperature sensor
27. 27.True or false: “the output turns faster” happens when a big gear drives a small one. (a) True (b) False
28. 28.True or false: to read a QR code, use a camera. (a) True (b) False
29. 29.🔍 Which sensor helps a robot know a button is pressed? (a) a light sensor (b) a touch sensor (c) a distance sensor (d) a camera
30. 30.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
31. 31.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) faster but weaker (c) not at all (d) at the same speed
32. 32.🦾 A servo program runs:
    angle = 130
    angle = angle − 50
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
33. 33.🔍 Which sensor helps a robot stay balanced upright? (a) a camera (b) a temperature sensor (c) a touch sensor (d) a gyro sensor
34. 34.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
35. 35.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
36. 36.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
37. 37.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) spins left on the spot (b) turns left (c) goes straight forward (d) stays still
38. 38.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
39. 39.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
40. 40.Which of these suits tracks? (a) flying over a field (b) hovering over a roof (c) a muddy building site (d) moving under water

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