Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 860 · 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.True or false: “deep mud” suits wheels. (a) False (b) True
2. 2.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times slower (c) 3 times faster (d) 3 times bigger
3. 3.🔍 Which sensor helps a robot feel a bump into a wall? (a) a camera (b) a light sensor (c) a distance sensor (d) a touch sensor
4. 4.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
5. 5.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
6. 6.🔍 Why do robots need sensors? (a) to use more power (b) to be heavier (c) to look colourful (d) to know their world
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
8. 8.🔍 Which sensor helps a robot follow a black line? (a) a temperature sensor (b) a light sensor (c) a camera (d) a sound sensor
9. 9.⬛ A reading below the threshold means the sensor is over … (a) water (b) white (c) the sky (d) black
10. 10.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
11. 11.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) slower (c) faster (d) nowhere
12. 12.True or false: to start on a hand clap, use a sound sensor. (a) True (b) False
13. 13.📡 A robot is 100 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 7 seconds (in cm)?
14. 14.🔍 Which sensor helps a robot measure how far a box is? (a) a distance sensor (b) a sound sensor (c) a touch sensor (d) a camera
15. 15.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 95. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
16. 16.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
17. 17.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
18. 18.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
19. 19.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
20. 20.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
21. 21.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
22. 22.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 15. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 20. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
24. 24.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
25. 25.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
26. 26.⚙️ A 10-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
27. 27.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.True or false: “moving under water” suits wheels. (a) True (b) False
29. 29.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
30. 30.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a servo (b) a track (c) a caster wheel (d) a gear
31. 31.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
32. 32.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 48. What is under the sensor? (a) the white floor (b) the black line
33. 33.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
34. 34.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
35. 35.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
36. 36.⚙️ 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
37. 37.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
38. 38.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
39. 39.🧭 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 90°. It turns left 30°, then right 120°. What does the gyro read now (0° to 359°)?
40. 40.🧭 A robot faces north. It does: turn left, turn around, turn left, turn left. Which way does it face now? (a) west (b) north (c) east (d) south

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