Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 296 · 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 distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.True or false: to know a button is pressed, use a camera. (a) True (b) False
3. 3.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
4. 4.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 84. What is under the sensor? (a) the black line (b) the white floor
5. 5.🧭 A robot faces north. It does: turn around, turn left. Which way does it face now? (a) south (b) east (c) north (d) west
6. 6.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) zero (d) small (fast, weak)
7. 7.Which job needs a touch sensor? (a) know a button is pressed (b) start on a hand clap (c) hear a whistle (d) spot a red ball
8. 8.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 66. What is under the sensor? (a) the black line (b) the white floor
9. 9.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a sound sensor (c) a camera (d) a gyro sensor
10. 10.🔍 Which sensor helps a robot stop before a wall? (a) a touch sensor (b) a distance sensor (c) a gyro sensor (d) a camera
11. 11.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
12. 12.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
13. 13.🔍 Which sensor helps a robot measure a turn angle? (a) a sound sensor (b) a light sensor (c) a touch sensor (d) a gyro sensor
14. 14.True or false: “a hospital corridor” suits wheels. (a) False (b) True
15. 15.⬛ The threshold of a light sensor is … (a) the wheel size (b) the battery size (c) the top speed (d) the black/white cut-off
16. 16.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
17. 17.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
18. 18.Which job needs a distance sensor? (a) warn if motors get hot (b) stay balanced upright (c) read a QR code (d) measure how far a box is
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 180°. It turns right 120°, then left 90°. What does the gyro read now (0° to 359°)?
20. 20.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 35. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
22. 22.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
23. 23.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 20
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
25. 25.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 340 cm (c) 34 cm (d) 1 km
26. 26.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 308 cm?
27. 27.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
28. 28.🔍 Which sensor helps a robot find the brightest spot? (a) a sound sensor (b) a light sensor (c) a touch sensor (d) a distance sensor
29. 29.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times bigger (c) 3 times faster (d) 3 times slower
30. 30.🛞 Which way of moving suits this best: “flying over a field”? (a) wheels (b) tracks (c) legs (d) propellers
31. 31.🧭 A robot faces east. It does: turn around, turn right, turn around. Which way does it face now? (a) north (b) south (c) east (d) west
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
33. 33.🔍 Which sensor helps a robot feel a bump into a wall? (a) a touch sensor (b) a camera (c) a temperature sensor (d) a distance sensor
34. 34.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size
35. 35.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 70. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
37. 37.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
38. 38.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
40. 40.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise

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