Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 959 · 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.🔍 Which sensor helps a robot stop before a wall? (a) a touch sensor (b) a distance sensor (c) a gyro sensor (d) a camera
2. 2.⚙️ A 60-tooth driver gear turns a 12-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
3. 3.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 31. What is under the sensor? (a) the black line (b) the white floor
4. 4.🧭 How many degrees is a right-angle turn? (a) 360° (b) 45° (c) 180° (d) 90°
5. 5.🛞 Which way of moving suits this best: “moving under water”? (a) tracks (b) legs (c) wheels (d) propellers
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.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
9. 9.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 45. What is under the sensor? (a) the black line (b) the white floor
10. 10.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
11. 11.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
12. 12.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
13. 13.⚙️ A 45-tooth driver gear turns a 15-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
14. 14.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) small (fast, weak) (c) never important (d) zero
15. 15.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
16. 16.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a gear (c) an output (d) a wheel
17. 17.🧭 A robot faces east. It does: turn left, turn around. Which way does it face now? (a) east (b) south (c) west (d) north
18. 18.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
19. 19.🦾 A servo program runs:
    angle = 60
    angle = angle − 40
    angle = angle + 50
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
21. 21.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
22. 22.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
23. 23.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
24. 24.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a caster wheel (c) a track (d) a servo
25. 25.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 73. What is under the sensor? (a) the black line (b) the white floor
26. 26.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
27. 27.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
28. 28.⚙️ An 8-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
29. 29.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
30. 30.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) backwards (c) faster (d) slower
31. 31.🔍 Which sensor helps a robot know a button is pressed? (a) a distance sensor (b) a camera (c) a sound sensor (d) a touch sensor
32. 32.🔍 Why do robots need sensors? (a) to know their world (b) to use more power (c) to look colourful (d) to be heavier
33. 33.⚙️ A 24-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
34. 34.🦾 A servo moves from 110° to 10°. How many degrees does it turn?
35. 35.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is wet (c) black soaks up light (d) black is loud
36. 36.📡 A robot is 290 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 49 seconds (in cm)?
37. 37.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
38. 38.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 68. What is under the sensor? (a) the black line (b) the white floor
39. 39.🧭 A robot should turn right 90°, but its gyro shows it turned 84°. How many degrees must it turn more to the right?
40. 40.📡 A robot is 110 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 17 seconds (in cm)?

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