Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 828 · 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 10-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
2. 2.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
3. 3.🛞 Which way of moving suits this best: “soft snow”? (a) wheels (b) tracks (c) propellers (d) legs
4. 4.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
6. 6.⚙️ A motor makes 60 turns a minute with a 10-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
7. 7.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
8. 8.📡 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
9. 9.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
10. 10.🛞 Which way of moving suits this best: “loose sand dunes”? (a) tracks (b) propellers (c) wheels (d) legs
11. 11.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
12. 12.🔍 Which sensor helps a robot measure a turn angle? (a) a light sensor (b) a touch sensor (c) a distance sensor (d) a gyro sensor
13. 13.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
14. 14.⬛ 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
15. 15.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
16. 16.⬛ A reading below the threshold means the sensor is over … (a) white (b) the sky (c) black (d) water
17. 17.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) tyre (c) driven gear (d) idler gear
18. 18.🧭 A robot should turn right 45°, but its gyro shows it turned 46°. How many degrees must it turn back to the left?
19. 19.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
20. 20.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
21. 21.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 180° (c) 90° (d) 360°
22. 22.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
23. 23.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
24. 24.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times faster (c) 3 times louder (d) 3 times slower
25. 25.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
26. 26.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
27. 27.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) small (fast, weak) (d) never important
28. 28.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
29. 29.⚙️ A motor makes 250 turns a minute with a 12-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
30. 30.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
31. 31.True or false: “a smooth classroom floor” suits propellers. (a) True (b) False
32. 32.Which job needs a sound sensor? (a) measure how far a box is (b) read a QR code (c) stay balanced upright (d) hear a whistle
33. 33.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
34. 34.🦾 A servo moves from 60° to 90°. How many degrees does it turn?
35. 35.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
36. 36.⚙️ An 8-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
37. 37.Which of these suits propellers? (a) stepping over wide gaps (b) flying over a field (c) soft snow (d) crossing stepping-stones
38. 38.🧭 A robot spins 30° every second. How many seconds does it take to turn 60°?
39. 39.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 3 cm (c) 340 cm (d) 1 km
40. 40.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points straight up (b) points left (c) points up and right (d) points up and left

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