Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 416 · 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 robot keeps turning right by 36° at a time. How many turns make one full circle?
2. 2.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
3. 3.🛞 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)?
4. 4.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) driver teeth (d) motor volts
5. 5.True or false: to feel a bump into a wall, use a camera. (a) False (b) True
6. 6.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
7. 7.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
8. 8.🔍 Why do robots need sensors? (a) to look colourful (b) to know their world (c) to be heavier (d) to use more power
9. 9.🧭 A robot spins 45° every second. How many seconds does it take to turn 45°?
10. 10.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 154 cm?
12. 12.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they float (c) they climb stairs (d) they look funny
13. 13.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
14. 14.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
15. 15.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
16. 16.True or false: to stop before a wall, use a temperature sensor. (a) True (b) False
17. 17.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) slower (c) nowhere (d) backwards
18. 18.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) harder to balance (c) they never tire (d) they are too cheap
19. 19.🛞 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 right (d) turns left
20. 20.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
21. 21.🔍 Which sensor helps a robot warn if motors get hot? (a) a sound sensor (b) a temperature sensor (c) a camera (d) a gyro sensor
22. 22.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times slower (d) 3 times bigger
23. 23.🔍 Which sensor helps a robot hear a whistle? (a) a distance sensor (b) a temperature sensor (c) a sound sensor (d) a camera
24. 24.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
25. 25.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a soft foam cushion (c) a flat wall (d) a metal door
26. 26.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
27. 27.🧭 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 180°, then left 45°. What does the gyro read now (0° to 359°)?
28. 28.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
29. 29.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
30. 30.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
31. 31.Which job needs a light sensor? (a) follow a black line (b) stop before a wall (c) hear a whistle (d) stay balanced upright
32. 32.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.⚙️ A 20-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
34. 34.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
36. 36.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
37. 37.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 2/7 (c) 7/22 (d) 22
38. 38.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
40. 40.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True

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