Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 891 · 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.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
2. 2.Which of these suits tracks? (a) a long factory floor (b) stepping over wide gaps (c) loose sand dunes (d) crossing stepping-stones
3. 3.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 90° (d) 360°
4. 4.🛞 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) turns left (b) spins right on the spot (c) goes straight back (d) goes straight forward
5. 5.🛞 Which way of moving suits this best: “deep mud”? (a) propellers (b) tracks (c) wheels (d) legs
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
8. 8.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
9. 9.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 65. What is under the sensor? (a) the black line (b) the white floor
10. 10.🧭 A robot spins 30° every second. How many seconds does it take to turn 90°?
11. 11.🧭 A robot spins 45° every second. How many seconds does it take to turn 360°?
12. 12.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
13. 13.📡 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?
14. 14.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 44 cm?
16. 16.Which job needs a gyro sensor? (a) know a button is pressed (b) measure a turn angle (c) find the brightest spot (d) follow a black line
17. 17.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
18. 18.⚙️ 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
19. 19.⚙️ 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
20. 20.📡 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?
21. 21.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
22. 22.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
23. 23.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a gyro sensor (c) a sound sensor (d) a camera
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
25. 25.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
26. 26.🔍 Which sensor helps a robot know a button is pressed? (a) a light sensor (b) a touch sensor (c) a gyro sensor (d) a camera
27. 27.True or false: to follow a black line, use a gyro sensor. (a) False (b) True
28. 28.🧭 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 left 180°, then left 45°. What does the gyro read now (0° to 359°)?
29. 29.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
31. 31.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
32. 32.🧭 A robot should turn right 90°, but its gyro shows it turned 83°. How many degrees must it turn more to the right?
33. 33.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) wheel size (d) number of gears
34. 34.🔍 Why do robots need sensors? (a) to use more power (b) to be heavier (c) to look colourful (d) to know their world
35. 35.Which of these suits tracks? (a) hovering over a roof (b) crossing stepping-stones (c) stepping over wide gaps (d) a muddy building site
36. 36.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
38. 38.🧭 A robot spins 30° every second. How many seconds does it take to turn 300°?
39. 39.⚙️ A motor makes 160 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
40. 40.⚙️ A 20-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?

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