Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 915 · 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 36-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
2. 2.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 15. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
3. 3.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 51. What is under the sensor? (a) the white floor (b) the black line
4. 4.True or false: to spot a red ball, use a camera. (a) False (b) True
5. 5.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
6. 6.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 53. What is under the sensor? (a) the black line (b) the white floor
8. 8.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
9. 9.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 1056 cm?
10. 10.True or false: to stay balanced upright, use a distance sensor. (a) True (b) False
11. 11.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
12. 12.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
13. 13.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
14. 14.🧭 How many degrees is a full turn? (a) 90° (b) 360° (c) 180° (d) 100°
15. 15.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 1 km (c) 340 cm (d) 34 cm
16. 16.⚙️ 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
17. 17.Which of these suits tracks? (a) crossing stepping-stones (b) a long factory floor (c) deep mud (d) a flat road
18. 18.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
19. 19.🔍 Which sensor helps a robot follow a black line? (a) a touch sensor (b) a camera (c) a light sensor (d) a sound sensor
20. 20.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 180° (c) 90° (d) 360°
21. 21.⚙️ A 12-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
22. 22.🧭 A robot should turn right 45°, but its gyro shows it turned 38°. How many degrees must it turn more to the right?
23. 23.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
24. 24.⚙️ A 24-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
25. 25.True or false: “crossing stepping-stones” suits legs. (a) True (b) False
26. 26.⬛ A reading below the threshold means the sensor is over … (a) white (b) the sky (c) water (d) black
27. 27.True or false: “a hospital corridor” suits tracks. (a) False (b) True
28. 28.True or false: “stepping over wide gaps” suits legs. (a) False (b) True
29. 29.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
30. 30.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) a gear (c) an output (d) an input
31. 31.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) driver teeth (d) motor volts
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
33. 33.🧭 A robot faces east. It does: turn right, turn right, turn right. Which way does it face now? (a) east (b) north (c) south (d) west
34. 34.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
35. 35.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) legs (c) propellers (d) tracks
36. 36.🧭 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 30°, then right 180°. What does the gyro read now (0° to 359°)?
37. 37.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it uses a sail (c) it stops for ever (d) it jumps
38. 38.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) propellers (c) legs (d) tracks
39. 39.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is hot (c) black soaks up light (d) black is loud
40. 40.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor

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