Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 233 · 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 job needs a camera? (a) measure a turn angle (b) warn if motors get hot (c) read a QR code (d) find the brightest spot
2. 2.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
3. 3.🛞 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) goes straight forward (b) curves to the right (c) curves to the left
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 70. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
5. 5.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
6. 6.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a gear (c) a track (d) a servo
7. 7.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black surface (c) a white surface (d) a black line
8. 8.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they float (c) fast and easy on floors (d) they climb stairs
9. 9.🦾 A servo program runs:
   angle = 10
   angle = angle + 60
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
11. 11.Which job needs a temperature sensor? (a) start on a hand clap (b) warn if motors get hot (c) find the brightest spot (d) spot a red ball
12. 12.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
13. 13.⬛ 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
14. 14.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
15. 15.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
16. 16.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
17. 17.🛞 Which way of moving suits this best: “moving under water”? (a) wheels (b) propellers (c) legs (d) tracks
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 20. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
19. 19.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it uses a sail (c) it jumps (d) it stops for ever
20. 20.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
21. 21.🔍 Which sensor helps a robot measure how far a box is? (a) a touch sensor (b) a light sensor (c) a distance sensor (d) a sound sensor
22. 22.Which of these suits tracks? (a) soft snow (b) a field of tall boulders (c) stepping over wide gaps (d) a smooth classroom floor
23. 23.🔍 Why do robots need sensors? (a) to be heavier (b) to use more power (c) to look colourful (d) to know their world
24. 24.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
25. 25.📡 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) Yes (b) No
26. 26.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
27. 27.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
28. 28.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
29. 29.🦾 A servo program runs:
    angle = 60
    angle = angle + 30
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
31. 31.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
32. 32.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
33. 33.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
36. 36.⚙️ A 36-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
37. 37.🔍 Which sensor helps a robot find the brightest spot? (a) a gyro sensor (b) a touch sensor (c) a light sensor (d) a distance sensor
38. 38.🛞 Which way of moving suits this best: “deep mud”? (a) tracks (b) legs (c) propellers (d) wheels
39. 39.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) faster (c) nowhere (d) slower
40. 40.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False

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