Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 368 · 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 servo program runs:
   angle = 30
   angle = angle + 30
   angle = angle − 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
2. 2.True or false: to measure a turn angle, use a touch sensor. (a) False (b) True
3. 3.⚙️ A 16-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
4. 4.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
5. 5.True or false: “a long factory floor” suits tracks. (a) False (b) True
6. 6.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
7. 7.🧭 A robot faces west. It does: turn left, turn right, turn left, turn right. Which way does it face now? (a) west (b) east (c) north (d) south
8. 8.📡 A robot is 250 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 5 seconds (in cm)?
9. 9.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 14 times. How many times does the driven gear turn?
11. 11.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.🔍 Which sensor helps a robot start on a hand clap? (a) a sound sensor (b) a temperature sensor (c) a touch sensor (d) a light sensor
13. 13.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
14. 14.🧭 What does a gyro help a robot do? (a) see colours (b) hear claps (c) smell smoke (d) turn by exact angles
15. 15.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
16. 16.🔍 Why do robots need sensors? (a) to look colourful (b) to use more power (c) to know their world (d) to be heavier
17. 17.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
18. 18.🧭 A robot faces west. It does: turn around, turn left, turn around, turn around. Which way does it face now? (a) west (b) south (c) north (d) east
19. 19.📡 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)?
20. 20.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?
21. 21.Which job needs a gyro sensor? (a) follow a black line (b) find the brightest spot (c) feel a bump into a wall (d) stay balanced upright
22. 22.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
23. 23.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
25. 25.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
26. 26.True or false: “a smooth classroom floor” suits propellers. (a) False (b) True
27. 27.🦾 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 up and left (b) points up and right (c) points straight up (d) points left
28. 28.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) propellers (b) tracks (c) wheels (d) legs
29. 29.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 45° (c) 90° (d) 180°
30. 30.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
31. 31.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 220 cm?
32. 32.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
34. 34.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) idler gear (c) driven gear (d) tyre
35. 35.⬛ A reading below the threshold means the sensor is over … (a) white (b) black (c) the sky (d) water
36. 36.🧭 A robot spins 60° every second. How many seconds does it take to turn 180°?
37. 37.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) bright light (d) radio music
38. 38.Which job needs a sound sensor? (a) hear a whistle (b) know a button is pressed (c) follow a black line (d) stay balanced upright
39. 39.Which of these suits wheels? (a) stepping over wide gaps (b) a long factory floor (c) a field of tall boulders (d) loose sand dunes
40. 40.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?

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