Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 806 · 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: to know a button is pressed, use a touch sensor. (a) False (b) True
2. 2.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
3. 3.🧭 A robot faces east. It does: turn around, turn right, turn left, turn left. Which way does it face now? (a) north (b) south (c) west (d) east
4. 4.📡 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)?
5. 5.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
6. 6.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
7. 7.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a sound sensor (c) a gyro sensor (d) a camera
8. 8.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
9. 9.True or false: “a muddy building site” suits propellers. (a) True (b) False
10. 10.📡 A robot is 150 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 2 seconds (in cm)?
11. 11.🧭 A robot spins 30° every second. How many seconds does it take to turn 240°?
12. 12.True or false: to follow a black line, use a camera. (a) False (b) True
13. 13.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22/7 (c) 22 (d) 7/22
14. 14.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) zero (c) never important (d) small (fast, weak)
15. 15.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
16. 16.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
17. 17.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
18. 18.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
19. 19.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
20. 20.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
21. 21.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
22. 22.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
23. 23.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
24. 24.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
26. 26.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 29. What is under the sensor? (a) the black line (b) the white floor
27. 27.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) they are too cheap (c) too fast on floors (d) harder to balance
28. 28.⚙️ A 15-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
30. 30.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
31. 31.🧭 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 45°, then left 30°. What does the gyro read now (0° to 359°)?
32. 32.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
33. 33.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
34. 34.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 10
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) under the left sensor (c) between the two sensors (d) far behind it
36. 36.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a caster wheel (d) a track
37. 37.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
38. 38.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 180° (d) 45°
39. 39.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
40. 40.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 95. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor

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