Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 991 · 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.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
2. 2.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
3. 3.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) propellers (b) wheels (c) tracks (d) legs
4. 4.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
5. 5.🛞 Which way of moving suits this best: “soft snow”? (a) wheels (b) tracks (c) legs (d) propellers
6. 6.Which job needs a temperature sensor? (a) follow a black line (b) spot a red ball (c) warn if motors get hot (d) know a button is pressed
7. 7.⬛ A reading below the threshold means the sensor is over … (a) water (b) the sky (c) white (d) black
8. 8.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
9. 9.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
10. 10.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
11. 11.🔍 Which sensor helps a robot hear a whistle? (a) a temperature sensor (b) a sound sensor (c) a distance sensor (d) a camera
12. 12.Which job needs a camera? (a) follow a black line (b) start on a hand clap (c) read a QR code (d) find the brightest spot
13. 13.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
14. 14.🧭 A robot faces north. It does: turn right, turn left, turn right, turn around. Which way does it face now? (a) west (b) north (c) south (d) east
15. 15.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
16. 16.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 25. What is under the sensor? (a) the white floor (b) the black line
17. 17.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
19. 19.🧭 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 270°. It turns left 135°, then right 120°, then right 60°. What does the gyro read now (0° to 359°)?
20. 20.🔍 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
21. 21.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) propellers (c) tracks (d) wheels
22. 22.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 90. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
23. 23.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its radius (d) its circumference
24. 24.🧭 A robot should turn right 45°, but its gyro shows it turned 35°. How many degrees must it turn more to the right?
25. 25.🧭 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 90°, then left 45°. What does the gyro read now (0° to 359°)?
26. 26.⚙️ 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
27. 27.🛞 Which way of moving suits this best: “a hospital corridor”? (a) tracks (b) propellers (c) legs (d) wheels
28. 28.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
29. 29.🦾 A servo moves from 50° to 120°. How many degrees does it turn?
30. 30.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they are too cheap (c) harder to balance (d) they never tire
31. 31.🔍 Which sensor helps a robot warn if motors get hot? (a) a camera (b) a temperature sensor (c) a light sensor (d) a distance sensor
32. 32.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is hot (c) black soaks up light (d) black is wet
33. 33.⚙️ 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 big driver gear (b) a small driver gear
34. 34.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a camera (c) a sound sensor (d) a gyro sensor
35. 35.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 22. What is under the sensor? (a) the black line (b) the white floor
36. 36.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
37. 37.🧭 A robot faces north. It does: turn left, turn left. Which way does it face now? (a) east (b) south (c) north (d) west
38. 38.Which job needs a light sensor? (a) warn if motors get hot (b) start on a hand clap (c) measure a turn angle (d) follow a black line
39. 39.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
40. 40.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 7/22 (c) 22 (d) 22/7

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