Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 587 · 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 light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
2. 2.True or false: “crossing stepping-stones” suits legs. (a) True (b) False
3. 3.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) tracks (b) wheels (c) legs (d) propellers
4. 4.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a gyro sensor (c) a camera (d) a touch sensor
5. 5.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the top speed (c) the battery size (d) the wheel size
6. 6.True or false: “flying over a field” suits propellers. (a) False (b) True
7. 7.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
8. 8.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
9. 9.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 35. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
10. 10.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
12. 12.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
13. 13.⚙️ 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
14. 14.🧭 A robot spins 15° every second. How many seconds does it take to turn 135°?
15. 15.Which of these suits legs? (a) loose sand dunes (b) flying over a field (c) crossing stepping-stones (d) hovering over a roof
16. 16.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
17. 17.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a bat (d) a goldfish
18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
19. 19.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
20. 20.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
21. 21.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
22. 22.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 15. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
23. 23.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
24. 24.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) faster but weaker (c) slower but stronger (d) not at all
25. 25.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.🔦 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 black line (b) the white floor
27. 27.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 38. What is under the sensor? (a) the white floor (b) the black line
28. 28.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
29. 29.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
30. 30.🧭 A robot spins 15° every second. How many seconds does it take to turn 225°?
31. 31.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle − 40
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
32. 32.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
33. 33.📡 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?
34. 34.Which job needs a temperature sensor? (a) know a button is pressed (b) warn if motors get hot (c) stop before a wall (d) stay balanced upright
35. 35.🧭 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 right 180°, then left 60°. What does the gyro read now (0° to 359°)?
36. 36.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
37. 37.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
38. 38.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black line (c) a black surface (d) a white surface
39. 39.🧭 A robot spins 60° every second. How many seconds does it take to turn 240°?
40. 40.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor

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