Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 23 · 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 60-tooth driver gear turns a 12-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
2. 2.🦾 A servo moves from 130° to 180°. How many degrees does it turn?
3. 3.📡 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
4. 4.True or false: to feel a bump into a wall, use a gyro sensor. (a) True (b) False
5. 5.Which job needs a light sensor? (a) spot a red ball (b) find the brightest spot (c) stop before a wall (d) know a button is pressed
6. 6.🔍 Which sensor helps a robot start on a hand clap? (a) a touch sensor (b) a distance sensor (c) a sound sensor (d) a camera
7. 7.🧭 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 right 180°. What does the gyro read now (0° to 359°)?
8. 8.⚙️ A 12-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
9. 9.Which of these suits propellers? (a) flying over a field (b) a muddy building site (c) a flat road (d) a field of tall boulders
10. 10.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
11. 11.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) one up, one down (c) the same direction (d) in opposite directions
12. 12.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is hot (c) black is loud (d) black soaks up light
14. 14.🦾 A servo moves from 90° to 180°. How many degrees does it turn?
15. 15.🧭 How many degrees is a full turn? (a) 90° (b) 180° (c) 100° (d) 360°
16. 16.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
17. 17.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 30. What is under the sensor? (a) the black line (b) the white floor
18. 18.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 6. What is under the sensor? (a) the white floor (b) the black line
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 95. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
20. 20.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) driven gear (c) tyre (d) idler gear
21. 21.⚙️ A 15-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
22. 22.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
23. 23.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
24. 24.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a flat wall (c) a soft foam cushion (d) a wooden box
25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
26. 26.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
27. 27.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.True or false: to follow a black line, use a temperature sensor. (a) True (b) False
29. 29.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
30. 30.📡 A robot stops if an object is closer than 60 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.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 1188 cm?
32. 32.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and left (b) points up and right (c) points right (d) points straight up
33. 33.🧭 A robot faces west. It does: turn around, turn right. Which way does it face now? (a) east (b) south (c) north (d) west
34. 34.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
36. 36.🧭 A robot spins 60° every second. How many seconds does it take to turn 180°?
37. 37.🧭 A robot spins 45° every second. How many seconds does it take to turn 360°?
38. 38.Which job needs a temperature sensor? (a) stop before a wall (b) hear a whistle (c) warn if motors get hot (d) spot a red ball
39. 39.📡 A robot is 250 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 35 seconds (in cm)?
40. 40.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left

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