Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 644 · 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 distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
3. 3.🛞 Which way of moving suits this best: “deep mud”? (a) propellers (b) wheels (c) tracks (d) legs
4. 4.🦾 A servo program runs:
   angle = 30
   angle = angle − 10
   angle = angle + 20
   angle = angle + 10
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
5. 5.🦾 A servo program runs:
   angle = 60
   angle = angle + 40
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
6. 6.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
7. 7.📡 An object is 238 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’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
9. 9.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
10. 10.Which job needs a camera? (a) stop before a wall (b) know a button is pressed (c) read a QR code (d) hear a whistle
11. 11.🔍 Which sensor helps a robot stop before a wall? (a) a gyro sensor (b) a camera (c) a distance sensor (d) a sound sensor
12. 12.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
13. 13.📡 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?
14. 14.True or false: to warn if motors get hot, use a temperature sensor. (a) True (b) False
15. 15.🦾 A servo moves from 110° to 50°. How many degrees does it turn?
16. 16.⬛ The threshold of a light sensor is … (a) the battery size (b) the top speed (c) the black/white cut-off (d) the wheel size
17. 17.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) nowhere (c) faster (d) backwards
18. 18.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is loud (c) black is hot (d) black is wet
19. 19.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a touch sensor (c) a sound sensor (d) a camera
20. 20.🦾 A servo moves from 110° to 80°. How many degrees does it turn?
21. 21.🧭 A robot spins 15° every second. How many seconds does it take to turn 120°?
22. 22.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
23. 23.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
24. 24.🧭 A robot faces south. It does: turn right, turn around. Which way does it face now? (a) east (b) south (c) west (d) north
25. 25.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
26. 26.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
28. 28.🔍 What does a gyro sensor measure? (a) sound (b) temperature (c) turning (rotation) (d) colour
29. 29.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 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
30. 30.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
32. 32.⚙️ A 36-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
33. 33.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
34. 34.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
35. 35.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
36. 36.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
37. 37.Which of these suits wheels? (a) moving under water (b) soft snow (c) a smooth classroom floor (d) a field of tall boulders
38. 38.True or false: to know a button is pressed, use a touch sensor. (a) True (b) False
39. 39.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
40. 40.True or false: to stay balanced upright, use a gyro sensor. (a) True (b) False

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