Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 723 · 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.🛞 Which way of moving suits this best: “soft snow”? (a) propellers (b) tracks (c) legs (d) wheels
2. 2.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.🧭 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 left 135°, then left 90°, then right 30°. What does the gyro read now (0° to 359°)?
4. 4.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) tracks (c) wheels (d) propellers
5. 5.⬛ The threshold of a light sensor is … (a) the wheel size (b) the black/white cut-off (c) the top speed (d) the battery size
6. 6.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
7. 7.🧭 A robot faces south. It does: turn right, turn right. Which way does it face now? (a) east (b) west (c) south (d) north
8. 8.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times slower (c) 3 times louder (d) 3 times faster
9. 9.🦾 A servo program runs:
   angle = 50
   angle = angle + 20
   angle = angle − 40
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
10. 10.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) stays still (b) goes straight forward (c) spins left on the spot (d) turns left
11. 11.Which of these suits tracks? (a) soft snow (b) a smooth classroom floor (c) crossing stepping-stones (d) a long factory floor
12. 12.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
13. 13.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
14. 14.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
15. 15.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True
16. 16.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 25. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
18. 18.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 26. What is under the sensor? (a) the white floor (b) the black line
19. 19.⚙️ A motor makes 180 turns a minute with a 12-tooth gear on it. That gear drives a 36-tooth gear. How many turns a minute does the 36-tooth gear make?
20. 20.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
21. 21.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
22. 22.⚙️ A 15-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
23. 23.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
24. 24.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
25. 25.🔍 Why do robots need sensors? (a) to know their world (b) to be heavier (c) to look colourful (d) to use more power
26. 26.🧭 A robot should turn right 180°, but its gyro shows it turned 179°. How many degrees must it turn more to the right?
27. 27.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) goes straight forward (b) spins left on the spot (c) spins right on the spot (d) goes straight back
28. 28.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
29. 29.🧭 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 45°, then right 120°. What does the gyro read now (0° to 359°)?
30. 30.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
31. 31.Which job needs a temperature sensor? (a) follow a black line (b) hear a whistle (c) start on a hand clap (d) warn if motors get hot
32. 32.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
33. 33.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 62. What is under the sensor? (a) the black line (b) the white floor
34. 34.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
35. 35.🧭 A robot faces north. It does: turn around, turn left, turn left, turn right. Which way does it face now? (a) south (b) north (c) east (d) west
36. 36.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
37. 37.🧭 A robot faces north. It does: turn right, turn left, turn around. Which way does it face now? (a) east (b) north (c) west (d) south
38. 38.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
39. 39.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
40. 40.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left

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