Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 430 · 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 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it uses a sail (c) it stops for ever (d) one wheel runs faster
3. 3.🔍 Why do robots need sensors? (a) to use more power (b) to look colourful (c) to know their world (d) to be heavier
4. 4.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they never tire (c) harder to balance (d) they are too cheap
5. 5.🛞 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)? =
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
7. 7.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) legs (c) propellers (d) tracks
8. 8.🧭 A robot faces north. It does: turn right, turn right, turn right, turn right. Which way does it face now? (a) south (b) north (c) east (d) west
9. 9.🛞 Which way of moving suits this best: “a long factory floor”? (a) propellers (b) legs (c) tracks (d) wheels
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
11. 11.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 38. What is under the sensor? (a) the black line (b) the white floor
12. 12.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 65. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
14. 14.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
15. 15.True or false: to measure a turn angle, use a camera. (a) True (b) False
16. 16.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a wheel (c) a gear (d) an output
17. 17.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) backwards (c) slower (d) faster
18. 18.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
19. 19.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
20. 20.⚙️ 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 big driver gear (b) a small driver gear
21. 21.⬛ A reading below the threshold means the sensor is over … (a) black (b) the sky (c) water (d) white
22. 22.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
23. 23.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
25. 25.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
26. 26.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) tracks (c) wheels (d) propellers
27. 27.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
29. 29.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
31. 31.Which job needs a distance sensor? (a) start on a hand clap (b) hear a whistle (c) stop before a wall (d) spot a red ball
32. 32.True or false: “hovering over a roof” suits propellers. (a) True (b) False
33. 33.📡 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)?
34. 34.Which of these suits wheels? (a) hovering over a roof (b) crossing stepping-stones (c) a hospital corridor (d) a field of tall boulders
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
36. 36.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
37. 37.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a gyro sensor (d) a touch sensor
38. 38.🦾 A servo moves from 140° to 60°. How many degrees does it turn?
39. 39.True or false: to feel a bump into a wall, use a gyro sensor. (a) True (b) False
40. 40.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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