Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 98 · 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.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
2. 2.⬛ The threshold of a light sensor is … (a) the top speed (b) the battery size (c) the wheel size (d) the black/white cut-off
3. 3.🧭 A robot spins 30° every second. How many seconds does it take to turn 120°?
4. 4.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
5. 5.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
6. 6.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) the same direction (c) they do not turn (d) one up, one down
7. 7.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a track (c) a gear (d) a servo
8. 8.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 77. What is under the sensor? (a) the white floor (b) the black line
9. 9.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
10. 10.🧭 A robot faces north. It does: turn right, turn right. Which way does it face now? (a) south (b) west (c) east (d) north
11. 11.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle − 20
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
12. 12.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its radius (d) its weight
13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
14. 14.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
15. 15.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 62. What is under the sensor? (a) the black line (b) the white floor
16. 16.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
17. 17.🦾 A servo moves from 50° to 80°. How many degrees does it turn?
18. 18.📡 A robot is 210 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 15 seconds (in cm)?
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 90. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
20. 20.📡 A robot is 100 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 5 seconds (in cm)?
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 90°, then left 90°, then right 120°. What does the gyro read now (0° to 359°)?
22. 22.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
23. 23.⚙️ A motor makes 80 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
24. 24.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
25. 25.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
26. 26.🧭 A robot spins 60° every second. How many seconds does it take to turn 360°?
27. 27.🛞 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 9 times. How far does the robot roll (in cm)?
28. 28.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
29. 29.🔍 Which sensor helps a robot find the brightest spot? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a sound sensor
30. 30.📡 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) No (b) Yes
31. 31.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
32. 32.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
33. 33.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
34. 34.🔍 Which sensor helps a robot follow a black line? (a) a touch sensor (b) a light sensor (c) a distance sensor (d) a temperature sensor
35. 35.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
36. 36.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 1 (c) 2 (d) 3
37. 37.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
38. 38.🧭 How many degrees is a right-angle turn? (a) 90° (b) 360° (c) 45° (d) 180°
39. 39.True or false: to warn if motors get hot, use a distance sensor. (a) False (b) True
40. 40.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?

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