Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 552 · 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.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
2. 2.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
3. 3.🛞 Which way of moving suits this best: “a hospital corridor”? (a) propellers (b) legs (c) wheels (d) tracks
4. 4.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 220 cm?
5. 5.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
6. 6.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 34. What is under the sensor? (a) the black line (b) the white floor
7. 7.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
8. 8.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
9. 9.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 63. What is under the sensor? (a) the black line (b) the white floor
10. 10.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a gyro sensor (c) a touch sensor (d) a sound sensor
11. 11.Which job needs a camera? (a) hear a whistle (b) know a button is pressed (c) feel a bump into a wall (d) read a QR code
12. 12.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
13. 13.⚙️ A motor makes 140 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
14. 14.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 27. What is under the sensor? (a) the black line (b) the white floor
15. 15.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 924 cm?
16. 16.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 74. What is under the sensor? (a) the white floor (b) the black line
17. 17.⚙️ A motor makes 140 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
18. 18.🧭 A robot should turn right 45°, but its gyro shows it turned 42°. How many degrees must it turn more to the right?
19. 19.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
20. 20.🧭 A robot spins 30° every second. How many seconds does it take to turn 90°?
21. 21.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black soaks up light (c) black is loud (d) black is wet
22. 22.📡 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?
23. 23.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
24. 24.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
25. 25.⚙️ A 15-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
26. 26.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 3 (c) 1 (d) 4
27. 27.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a metal door (d) a soft foam cushion
28. 28.True or false: to follow a black line, use a light sensor. (a) True (b) False
29. 29.🧭 A robot spins 30° every second. How many seconds does it take to turn 330°?
30. 30.⚙️ 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
31. 31.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 25. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
32. 32.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
33. 33.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
34. 34.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
35. 35.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) it goes there and back (c) sound is slow (d) the sensor is half
36. 36.True or false: “moving under water” suits propellers. (a) True (b) False
37. 37.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
38. 38.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) far behind it (d) under the right sensor
39. 39.🦾 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 straight up (b) points up and right (c) points up and left (d) points right
40. 40.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor

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