Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 221 · 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 faster with more V? (a) a servo motor (b) a DC motor
2. 2.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 35. What is under the sensor? (a) the black line (b) the white floor
3. 3.Which of these suits wheels? (a) flying over a field (b) crossing stepping-stones (c) deep mud (d) a smooth classroom floor
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 75. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
5. 5.🛞 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
6. 6.True or false: “the output turns faster” happens when a small gear drives a big one. (a) False (b) True
7. 7.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) goes straight forward (b) goes straight back (c) turns right (d) spins left on the spot
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
9. 9.⚙️ 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
10. 10.True or false: “deep mud” suits legs. (a) True (b) False
11. 11.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 352 cm?
13. 13.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is wet (c) black is loud (d) black soaks up light
14. 14.True or false: to warn if motors get hot, use a light sensor. (a) False (b) True
15. 15.🧭 How many degrees is a right-angle turn? (a) 45° (b) 360° (c) 180° (d) 90°
16. 16.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
17. 17.🧭 A robot faces south. It does: turn right, turn around, turn around. Which way does it face now? (a) north (b) east (c) west (d) south
18. 18.⚙️ A motor makes 30 turns a minute with a 12-tooth gear on it. That gear drives a 36-tooth gear. How many turns a minute does the 36-tooth gear make?
19. 19.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
20. 20.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True
21. 21.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
22. 22.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
23. 23.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
24. 24.🛞 Which way of moving suits this best: “moving under water”? (a) wheels (b) tracks (c) propellers (d) legs
25. 25.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.🦾 A servo moves from 0° to 180°. How many degrees does it turn?
27. 27.🔍 Which sensor helps a robot follow a black line? (a) a gyro sensor (b) a touch sensor (c) a light sensor (d) a temperature sensor
28. 28.🔍 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
29. 29.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 90° (c) 45° (d) 180°
30. 30.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
31. 31.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
32. 32.🧭 A robot faces east. It does: turn right, turn around, turn right, turn left. Which way does it face now? (a) east (b) south (c) north (d) west
33. 33.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times faster (c) 3 times louder (d) 3 times bigger
34. 34.🧭 A robot should turn right 90°, but its gyro shows it turned 101°. How many degrees must it turn back to the left?
35. 35.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 660 cm?
36. 36.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
37. 37.🔍 Which sensor helps a robot read a QR code? (a) a camera (b) a temperature sensor (c) a gyro sensor (d) a sound sensor
38. 38.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the right sensor (c) far behind it (d) under the left sensor
39. 39.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
40. 40.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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