Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 526 · 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 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 right 30°, then left 30°, then right 30°. What does the gyro read now (0° to 359°)?
2. 2.🧭 How many degrees is a right-angle turn? (a) 180° (b) 45° (c) 90° (d) 360°
3. 3.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
4. 4.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) small (fast, weak) (d) zero
5. 5.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
6. 6.True or false: to find the brightest spot, use a light sensor. (a) False (b) True
7. 7.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
8. 8.🛞 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) turns right (b) stays still (c) spins right on the spot (d) goes straight back
9. 9.🧭 A robot faces west. It does: turn around, turn right. Which way does it face now? (a) south (b) east (c) west (d) north
10. 10.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) far behind it (c) under the left sensor (d) under the right sensor
11. 11.Which of these suits propellers? (a) flying over a field (b) a flat road (c) a field of tall boulders (d) soft snow
12. 12.⚙️ A 15-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
13. 13.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
15. 15.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) propellers (b) legs (c) tracks (d) wheels
16. 16.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 7/22 (c) 22 (d) 2/7
17. 17.🧭 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 180°. It turns right 60°, then left 180°. What does the gyro read now (0° to 359°)?
18. 18.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) tyre (c) idler gear (d) driver gear
19. 19.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) slower but stronger (c) at the same speed (d) not at all
20. 20.🔍 Why do robots need sensors? (a) to look colourful (b) to be heavier (c) to use more power (d) to know their world
21. 21.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
22. 22.⚙️ A 60-tooth driver gear turns a 12-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
23. 23.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
25. 25.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
26. 26.True or false: to read a QR code, use a light sensor. (a) True (b) False
27. 27.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
28. 28.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) legs (b) tracks (c) propellers (d) wheels
29. 29.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
30. 30.🔍 Which sensor helps a robot start on a hand clap? (a) a temperature sensor (b) a touch sensor (c) a distance sensor (d) a sound sensor
31. 31.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) wheel size (d) number of gears
32. 32.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
33. 33.⚙️ A motor makes 500 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
34. 34.🧭 A robot should turn right 45°, but its gyro shows it turned 55°. How many degrees must it turn back to the left?
35. 35.🔍 Which sensor helps a robot read a QR code? (a) a camera (b) a touch sensor (c) a gyro sensor (d) a temperature sensor
36. 36.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
37. 37.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
38. 38.🧭 A robot faces north. It does: turn left, turn around, turn around. Which way does it face now? (a) north (b) east (c) south (d) west
39. 39.🧭 How many degrees is a full turn? (a) 360° (b) 100° (c) 180° (d) 90°
40. 40.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an input (c) a gear (d) an output

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