Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 3 · 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 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
2. 2.🧭 A robot should turn right 180°, but its gyro shows it turned 187°. How many degrees must it turn back to the left?
3. 3.Which job needs a light sensor? (a) feel a bump into a wall (b) know a button is pressed (c) find the brightest spot (d) warn if motors get hot
4. 4.🧭 A robot should turn right 45°, but its gyro shows it turned 50°. How many degrees must it turn back to the left?
5. 5.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
6. 6.🧭 A robot faces north. It does: turn right, turn right. Which way does it face now? (a) south (b) west (c) north (d) east
7. 7.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) the same direction (d) they do not turn
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
10. 10.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 792 cm?
11. 11.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
12. 12.🧭 A robot spins 30° every second. How many seconds does it take to turn 150°?
13. 13.True or false: “crossing stepping-stones” suits legs. (a) False (b) True
14. 14.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points right (b) points up and left (c) points left (d) points up and right
15. 15.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is hot (c) black is loud (d) black soaks up light
16. 16.🧭 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 left 45°, then left 30°, then right 180°. What does the gyro read now (0° to 359°)?
17. 17.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) harder to balance (c) they are too cheap (d) too fast on floors
18. 18.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
19. 19.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
20. 20.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
21. 21.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
22. 22.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they climb stairs (c) they float (d) they look funny
23. 23.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
24. 24.True or false: to follow a black line, use a light sensor. (a) False (b) True
25. 25.🧭 A robot spins 30° every second. How many seconds does it take to turn 120°?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
27. 27.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
28. 28.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
29. 29.🛞 Which way of moving suits this best: “hovering over a roof”? (a) wheels (b) legs (c) propellers (d) tracks
30. 30.🛞 Which way of moving suits this best: “a long factory floor”? (a) propellers (b) wheels (c) tracks (d) legs
31. 31.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
32. 32.🔍 Which sensor helps a robot spot a red ball? (a) a camera (b) a sound sensor (c) a touch sensor (d) a temperature sensor
33. 33.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and right (b) points right (c) points straight up (d) points left
34. 34.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
35. 35.⚙️ A motor makes 20 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?
36. 36.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) legs (b) wheels (c) tracks (d) propellers
37. 37.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) tracks (b) legs (c) propellers (d) wheels
38. 38.🧭 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 left 120°, then left 30°. What does the gyro read now (0° to 359°)?
39. 39.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 27 times. How many times does the driven gear turn?
40. 40.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 73. What is under the sensor? (a) the white floor (b) the black line

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