Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 495 · 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.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
2. 2.📡 A robot is 290 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 6 seconds (in cm)?
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 40. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
4. 4.🧭 A robot spins 45° every second. How many seconds does it take to turn 135°?
5. 5.Which job needs a temperature sensor? (a) find the brightest spot (b) read a QR code (c) spot a red ball (d) warn if motors get hot
6. 6.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
7. 7.⬛ The threshold of a light sensor is … (a) the battery size (b) the top speed (c) the wheel size (d) the black/white cut-off
8. 8.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a servo (b) a caster wheel (c) a gear (d) a track
9. 9.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
10. 10.🧭 A robot faces south. It does: turn right, turn left. Which way does it face now? (a) north (b) south (c) west (d) east
11. 11.🦾 A servo program runs:
    angle = 100
    angle = angle − 20
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
12. 12.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) zero (c) small (fast, weak) (d) never important
14. 14.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black soaks up light (c) black is hot (d) black is wet
15. 15.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 7 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 72. What is under the sensor? (a) the black line (b) the white floor
17. 17.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
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 0°. It turns right 135°, then right 30°, then left 135°. What does the gyro read now (0° to 359°)?
20. 20.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.True or false: to stay balanced upright, use a gyro sensor. (a) True (b) False
22. 22.🧭 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 left 60°, then left 60°. What does the gyro read now (0° to 359°)?
23. 23.True or false: “crossing stepping-stones” suits legs. (a) False (b) True
24. 24.🔍 Which sensor helps a robot know a button is pressed? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a touch sensor
25. 25.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 360° (d) 180°
26. 26.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) goes straight back (b) spins right on the spot (c) goes straight forward (d) turns right
27. 27.🛞 Which way of moving suits this best: “hovering over a roof”? (a) legs (b) wheels (c) propellers (d) tracks
28. 28.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 90° (d) 100°
29. 29.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
30. 30.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
31. 31.🛞 Which way of moving suits this best: “deep mud”? (a) wheels (b) propellers (c) legs (d) tracks
32. 32.⚙️ A motor makes 300 turns a minute with a 20-tooth gear on it. That gear drives a 100-tooth gear. How many turns a minute does the 100-tooth gear make?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
34. 34.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
35. 35.🔍 Which sensor helps a robot feel a bump into a wall? (a) a light sensor (b) a camera (c) a touch sensor (d) a sound sensor
36. 36.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 360° (d) 45°
37. 37.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 55. What is under the sensor? (a) the white floor (b) the black line
38. 38.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
39. 39.📡 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)?
40. 40.🧭 A robot should turn right 90°, but its gyro shows it turned 82°. How many degrees must it turn more to the right?

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