Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 225 · 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.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) a wheel (c) an input (d) an output
2. 2.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) wheels (c) tracks (d) propellers
3. 3.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
5. 5.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points right (b) points straight up (c) points left (d) points up and left
6. 6.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
7. 7.🔍 Which sensor helps a robot measure a turn angle? (a) a gyro sensor (b) a sound sensor (c) a camera (d) a touch sensor
8. 8.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it stops for ever (c) it jumps (d) one wheel runs faster
9. 9.True or false: to hear a whistle, use a sound sensor. (a) False (b) True
10. 10.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
11. 11.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) sound is slow (c) it goes there and back (d) the sensor is half
12. 12.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
13. 13.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 34. What is under the sensor? (a) the white floor (b) the black line
14. 14.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
15. 15.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
16. 16.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) tracks (b) wheels (c) propellers (d) legs
17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
18. 18.Which job needs a gyro sensor? (a) find the brightest spot (b) follow a black line (c) read a QR code (d) measure a turn angle
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
20. 20.🧭 A robot spins 60° every second. How many seconds does it take to turn 180°?
21. 21.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
22. 22.True or false: “stepping over wide gaps” suits legs. (a) False (b) True
23. 23.⚙️ 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
24. 24.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
25. 25.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a white surface (c) a dark tunnel (d) a black surface
26. 26.🧭 A robot spins 30° every second. How many seconds does it take to turn 360°?
27. 27.🛞 Which way of moving suits this best: “hovering over a roof”? (a) legs (b) tracks (c) propellers (d) wheels
28. 28.⚙️ A 36-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
29. 29.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
30. 30.🧭 A robot should turn right 45°, but its gyro shows it turned 49°. How many degrees must it turn back to the left?
31. 31.🧭 How many degrees is a right-angle turn? (a) 90° (b) 360° (c) 180° (d) 45°
32. 32.🦾 A servo moves from 120° to 80°. How many degrees does it turn?
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 65. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
34. 34.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
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 270°. It turns right 60°, then right 90°, then left 45°. What does the gyro read now (0° to 359°)?
36. 36.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.🛞 Which way of moving suits this best: “deep mud”? (a) tracks (b) legs (c) wheels (d) propellers
38. 38.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
39. 39.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
40. 40.Which job needs a distance sensor? (a) follow a black line (b) stop before a wall (c) know a button is pressed (d) hear a whistle

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