Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 497 · 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 gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
2. 2.⚙️ A 10-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
3. 3.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
4. 4.🧭 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 120°, then left 135°, then left 135°. What does the gyro read now (0° to 359°)?
5. 5.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
6. 6.🦾 A servo program runs:
   angle = 70
   angle = angle + 20
   angle = angle + 10
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
8. 8.⚙️ A 16-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
9. 9.🛞 Which way of moving suits this best: “soft snow”? (a) tracks (b) legs (c) propellers (d) wheels
10. 10.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
11. 11.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 3 (c) 1 (d) 2
12. 12.🔍 Why do robots need sensors? (a) to know their world (b) to look colourful (c) to be heavier (d) to use more power
13. 13.🦾 A servo program runs:
    angle = 80
    angle = angle − 30
    angle = angle + 50
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
14. 14.📡 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)?
15. 15.True or false: “a hospital corridor” suits legs. (a) False (b) True
16. 16.True or false: to measure a turn angle, use a light sensor. (a) False (b) True
17. 17.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) backwards (c) slower (d) nowhere
18. 18.🔍 Which sensor helps a robot feel a bump into a wall? (a) a sound sensor (b) a touch sensor (c) a light sensor (d) a gyro sensor
19. 19.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
20. 20.⬛ 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
21. 21.⚙️ 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
22. 22.🛞 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) goes straight back (b) turns left (c) turns right (d) stays still
23. 23.🧭 A robot spins 30° every second. How many seconds does it take to turn 360°?
24. 24.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
25. 25.🦾 A servo moves from 140° to 160°. How many degrees does it turn?
26. 26.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 63. What is under the sensor? (a) the black line (b) the white floor
27. 27.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black soaks up light (c) black is wet (d) black is loud
28. 28.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a servo (c) a caster wheel (d) a gear
29. 29.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
30. 30.🔍 Which sensor helps a robot find the brightest spot? (a) a touch sensor (b) a temperature sensor (c) a light sensor (d) a sound sensor
31. 31.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 64. What is under the sensor? (a) the black line (b) the white floor
32. 32.📡 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)?
33. 33.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
34. 34.⚙️ A 48-tooth driver gear turns a 12-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
35. 35.True or false: “loose sand dunes” suits wheels. (a) False (b) True
36. 36.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) to make it smaller (c) it goes there and back (d) sound is slow
37. 37.🧭 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 135°, then left 180°. What does the gyro read now (0° to 359°)?
38. 38.📡 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?
39. 39.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) tracks (b) propellers (c) wheels (d) legs
40. 40.⚙️ A motor makes 120 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?

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