Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 872 · 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 robot should turn right 45°, but its gyro shows it turned 32°. How many degrees must it turn more to the right?
2. 2.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 18. What is under the sensor? (a) the black line (b) the white floor
3. 3.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it stops for ever (c) it jumps (d) one wheel runs faster
4. 4.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
5. 5.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.🧭 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 90°, then right 180°. What does the gyro read now (0° to 359°)?
7. 7.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points left (b) points right (c) points straight up (d) points up and left
8. 8.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.⚙️ A 20-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
10. 10.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🧭 A robot spins 60° every second. How many seconds does it take to turn 240°?
12. 12.True or false: to measure a turn angle, use a gyro sensor. (a) True (b) False
13. 13.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) stays still (b) turns left (c) goes straight forward (d) goes straight back
14. 14.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is loud (c) black soaks up light (d) black is wet
15. 15.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
16. 16.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 25. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
17. 17.📡 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)?
18. 18.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
19. 19.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
20. 20.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
21. 21.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 44. What is under the sensor? (a) the white floor (b) the black line
22. 22.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22/7 (c) 7/22 (d) 22
23. 23.Which job needs a sound sensor? (a) warn if motors get hot (b) hear a whistle (c) stay balanced upright (d) read a QR code
24. 24.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) far behind it (c) under the right sensor (d) between the two sensors
25. 25.⚙️ 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 small driver gear (b) a big driver gear
26. 26.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) the same direction (c) one up, one down (d) they do not turn
27. 27.🔍 Which sensor helps a robot measure a turn angle? (a) a touch sensor (b) a gyro sensor (c) a distance sensor (d) a light sensor
28. 28.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 66. What is under the sensor? (a) the white floor (b) the black line
29. 29.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
30. 30.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
33. 33.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 50. What is under the sensor? (a) the black line (b) the white floor
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
35. 35.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
36. 36.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 3 (c) 2 (d) 1
37. 37.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
38. 38.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 95. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
39. 39.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
40. 40.🛞 Which way of moving suits this best: “a hospital corridor”? (a) tracks (b) wheels (c) legs (d) propellers

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