Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 176 · 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 robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
2. 2.🧭 A robot faces south. It does: turn right, turn right. Which way does it face now? (a) east (b) west (c) north (d) south
3. 3.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a white surface (c) a black line (d) a black surface
4. 4.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is loud (d) black is hot
5. 5.🔍 Which sensor helps a robot stay balanced upright? (a) a touch sensor (b) a camera (c) a gyro sensor (d) a light sensor
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
7. 7.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
8. 8.🛞 Which way of moving suits this best: “loose sand dunes”? (a) propellers (b) tracks (c) legs (d) wheels
9. 9.🧭 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 60°, then left 90°. What does the gyro read now (0° to 359°)?
10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
11. 11.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
12. 12.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) bright light (d) sound too high to hear
13. 13.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) goes straight forward (b) goes straight back (c) turns left (d) stays still
14. 14.Which of these suits tracks? (a) stepping over wide gaps (b) a field of tall boulders (c) a long factory floor (d) a muddy building site
15. 15.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
16. 16.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) driver teeth (d) number of gears
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
18. 18.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
19. 19.True or false: to follow a black line, use a light sensor. (a) True (b) False
20. 20.🧭 A robot spins 90° every second. How many seconds does it take to turn 180°?
21. 21.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
22. 22.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) far behind it (c) between the two sensors (d) under the right sensor
23. 23.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) wheels (b) tracks (c) propellers (d) legs
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
25. 25.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
26. 26.True or false: to measure how far a box is, use a distance sensor. (a) True (b) False
27. 27.🦾 A servo program runs:
    angle = 70
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
28. 28.🛞 Which way of moving suits this best: “soft snow”? (a) wheels (b) propellers (c) tracks (d) legs
29. 29.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 40. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
30. 30.🧭 A robot should turn right 45°, but its gyro shows it turned 43°. How many degrees must it turn more to the right?
31. 31.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
32. 32.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
33. 33.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
34. 34.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
35. 35.🧭 A robot faces east. It does: turn left, turn around, turn right, turn around. Which way does it face now? (a) north (b) south (c) east (d) west
36. 36.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
37. 37.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 30. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
38. 38.🔍 Why do robots need sensors? (a) to use more power (b) to be heavier (c) to look colourful (d) to know their world
39. 39.True or false: “flying over a field” suits tracks. (a) False (b) True
40. 40.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No

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