Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 700 · 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 servo program runs:
   angle = 0
   angle = angle + 40
   angle = angle + 10
   angle = angle + 60
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
2. 2.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) an input (c) a gear (d) a wheel
3. 3.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
4. 4.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 15. What is under the sensor? (a) the white floor (b) the black line
5. 5.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) idler gear (c) driven gear (d) tyre
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 0°. It turns right 120°, then left 45°. What does the gyro read now (0° to 359°)?
7. 7.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
8. 8.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) far behind it (c) between the two sensors (d) under the left sensor
9. 9.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
10. 10.Which job needs a light sensor? (a) feel a bump into a wall (b) spot a red ball (c) measure a turn angle (d) follow a black line
11. 11.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
12. 12.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
13. 13.True or false: “a smooth classroom floor” suits legs. (a) False (b) True
14. 14.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
15. 15.⚙️ A motor makes 450 turns a minute with a 12-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
17. 17.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
18. 18.🔍 Which sensor helps a robot warn if motors get hot? (a) a touch sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
19. 19.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
20. 20.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
21. 21.🧭 A robot faces west. It does: turn right, turn around, turn left, turn left. Which way does it face now? (a) east (b) south (c) west (d) north
22. 22.⚙️ 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
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 85. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
24. 24.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 9. What is under the sensor? (a) the white floor (b) the black line
25. 25.⚙️ A motor makes 160 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
26. 26.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
27. 27.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a caster wheel (c) a gear (d) a servo
28. 28.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) wheels (b) tracks (c) legs (d) propellers
29. 29.📡 Why do we halve the echo’s total path? (a) sound is slow (b) to make it smaller (c) it goes there and back (d) the sensor is half
30. 30.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 7/22 (c) 22/7 (d) 2/7
31. 31.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) one up, one down (c) in opposite directions (d) they do not turn
32. 32.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 34 cm (d) 3 cm
33. 33.True or false: to warn if motors get hot, use a sound sensor. (a) True (b) False
34. 34.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
35. 35.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 25. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
37. 37.📡 A robot is 130 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
38. 38.True or false: to spot a red ball, use a camera. (a) True (b) False
39. 39.Which job needs a touch sensor? (a) follow a black line (b) know a button is pressed (c) stay balanced upright (d) find the brightest spot
40. 40.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°

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