Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 911 · 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 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
2. 2.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
3. 3.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 37. What is under the sensor? (a) the white floor (b) the black line
4. 4.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 59. What is under the sensor? (a) the black line (b) the white floor
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
6. 6.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 15. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
7. 7.⬛ A reading below the threshold means the sensor is over … (a) black (b) white (c) the sky (d) water
8. 8.🧭 A robot faces east. It does: turn around, turn around. Which way does it face now? (a) west (b) east (c) south (d) north
9. 9.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
10. 10.Which of these suits propellers? (a) a flat road (b) hovering over a roof (c) soft snow (d) deep mud
11. 11.🔍 Which sensor helps a robot stop before a wall? (a) a camera (b) a temperature sensor (c) a distance sensor (d) a sound sensor
12. 12.📡 A robot is 200 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 25 seconds (in cm)?
13. 13.🧭 A robot faces east. It does: turn around, turn left, turn around, turn right. Which way does it face now? (a) south (b) west (c) east (d) north
14. 14.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
15. 15.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
17. 17.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
18. 18.🧭 A robot should turn right 180°, but its gyro shows it turned 175°. How many degrees must it turn more to the right?
19. 19.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
20. 20.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
21. 21.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
22. 22.Which job needs a light sensor? (a) follow a black line (b) spot a red ball (c) stay balanced upright (d) know a button is pressed
23. 23.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
24. 24.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
25. 25.📡 A robot is 150 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 3 seconds (in cm)?
26. 26.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it stops for ever (c) it uses a sail (d) one wheel runs faster
27. 27.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
28. 28.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and left (b) points left (c) points right (d) points straight up
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
30. 30.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a track (c) a caster wheel (d) a servo
31. 31.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
32. 32.🛞 Circumference = π × … (a) diameter (b) weight (c) speed (d) radius only
33. 33.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a wheel (c) an input (d) a gear
34. 34.🔍 Which sensor helps a robot read a QR code? (a) a temperature sensor (b) a distance sensor (c) a camera (d) a sound sensor
35. 35.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
36. 36.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
37. 37.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
38. 38.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
39. 39.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.🧭 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 120°, then left 30°, then right 120°. What does the gyro read now (0° to 359°)?

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