Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 730 · 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 object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
2. 2.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) they do not turn (c) in opposite directions (d) the same direction
3. 3.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
4. 4.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
5. 5.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
6. 6.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
7. 7.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) goes straight forward (b) spins right on the spot (c) turns left (d) turns right
8. 8.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.🛞 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)? =
10. 10.Which job needs a distance sensor? (a) read a QR code (b) find the brightest spot (c) hear a whistle (d) measure how far a box is
11. 11.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
12. 12.🧭 What does a gyro help a robot do? (a) smell smoke (b) turn by exact angles (c) hear claps (d) see colours
13. 13.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) slower (c) backwards (d) faster
14. 14.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
15. 15.🛞 Which way of moving suits this best: “flying over a field”? (a) tracks (b) wheels (c) propellers (d) legs
16. 16.True or false: to start on a hand clap, use a sound sensor. (a) False (b) True
17. 17.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
18. 18.Which job needs a touch sensor? (a) spot a red ball (b) measure a turn angle (c) find the brightest spot (d) know a button is pressed
19. 19.🦾 A servo moves from 10° to 140°. How many degrees does it turn?
20. 20.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
21. 21.📡 A robot is 270 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 1 second (in cm)?
22. 22.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 7/22 (c) 22/7 (d) 2/7
23. 23.True or false: “loose sand dunes” suits tracks. (a) False (b) True
24. 24.🔍 Which sensor helps a robot stop before a wall? (a) a touch sensor (b) a distance sensor (c) a camera (d) a gyro sensor
25. 25.🧭 A robot faces west. It does: turn left, turn left, turn left, turn around. Which way does it face now? (a) west (b) east (c) south (d) north
26. 26.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
27. 27.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
28. 28.🧭 A robot faces north. It does: turn right, turn right. Which way does it face now? (a) west (b) east (c) north (d) south
29. 29.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 36 times. How many times does the driven gear turn?
30. 30.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) an input (c) a gear (d) a wheel
31. 31.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
32. 32.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
33. 33.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is hot (d) black is loud
34. 34.⬛ The threshold of a light sensor is … (a) the wheel size (b) the top speed (c) the black/white cut-off (d) the battery size
35. 35.🧭 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 0°. It turns right 30°, then left 45°. What does the gyro read now (0° to 359°)?
36. 36.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
37. 37.🔍 Which sensor helps a robot warn if motors get hot? (a) a touch sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor
38. 38.⚙️ A motor makes 180 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?
39. 39.⚙️ 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
40. 40.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower

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