Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 284 · 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.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
2. 2.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
3. 3.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) radio music (d) bright light
4. 4.🔍 Which sensor helps a robot warn if motors get hot? (a) a distance sensor (b) a camera (c) a light sensor (d) a temperature sensor
5. 5.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
6. 6.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 31. What is under the sensor? (a) the white floor (b) the black line
7. 7.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
8. 8.True or false: “a hospital corridor” suits propellers. (a) False (b) True
9. 9.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
10. 10.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
11. 11.Which of these suits tracks? (a) a long factory floor (b) soft snow (c) a flat road (d) a field of tall boulders
12. 12.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 42. What is under the sensor? (a) the black line (b) the white floor
13. 13.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
15. 15.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
16. 16.True or false: “deep mud” suits propellers. (a) True (b) False
17. 17.📡 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) Yes (b) No
18. 18.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) wheel size (d) driver teeth
19. 19.🧭 A robot should turn right 180°, but its gyro shows it turned 173°. How many degrees must it turn more to the right?
20. 20.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
21. 21.True or false: “stepping over wide gaps” suits legs. (a) True (b) False
22. 22.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 69. What is under the sensor? (a) the white floor (b) the black line
23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
25. 25.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
26. 26.True or false: to warn if motors get hot, use a light sensor. (a) False (b) True
27. 27.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
28. 28.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 360° (c) 45° (d) 180°
29. 29.Which of these suits legs? (a) crossing stepping-stones (b) flying over a field (c) a muddy building site (d) hovering over a roof
30. 30.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
31. 31.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
33. 33.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 75. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
35. 35.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
36. 36.🧭 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 right 120°, then right 135°. What does the gyro read now (0° to 359°)?
37. 37.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 3 cm (c) 34 cm (d) 340 cm
38. 38.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
39. 39.🧭 A robot faces west. It does: turn right, turn left. Which way does it face now? (a) north (b) east (c) south (d) west
40. 40.🦾 A servo moves from 0° to 180°. How many degrees does it turn?

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