Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 439 · 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’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 660 cm?
2. 2.🧭 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 270°. It turns left 60°, then left 30°, then right 135°. What does the gyro read now (0° to 359°)?
3. 3.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
4. 4.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22 (c) 7/22 (d) 22/7
5. 5.🧭 How many degrees is a right-angle turn? (a) 90° (b) 45° (c) 180° (d) 360°
6. 6.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
7. 7.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
8. 8.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 51. What is under the sensor? (a) the black line (b) the white floor
9. 9.📡 A robot is 250 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 10 seconds (in cm)?
10. 10.🔍 What does a gyro sensor measure? (a) colour (b) sound (c) turning (rotation) (d) temperature
11. 11.🧭 A robot spins 45° every second. How many seconds does it take to turn 45°?
12. 12.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
14. 14.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 30. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
15. 15.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its weight (d) its radius
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
17. 17.⚙️ A motor makes 360 turns a minute with a 20-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
18. 18.🛞 Which way of moving suits this best: “flying over a field”? (a) propellers (b) tracks (c) wheels (d) legs
19. 19.🔍 Why do robots need sensors? (a) to use more power (b) to be heavier (c) to look colourful (d) to know their world
20. 20.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) False (b) True
21. 21.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 360° (c) 45° (d) 90°
22. 22.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
23. 23.True or false: to feel a bump into a wall, use a touch sensor. (a) True (b) False
24. 24.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 51. What is under the sensor? (a) the white floor (b) the black line
25. 25.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
26. 26.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
27. 27.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) under the right sensor (d) between the two sensors
28. 28.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 80. What is under the sensor? (a) the black line (b) the white floor
29. 29.Which job needs a light sensor? (a) feel a bump into a wall (b) find the brightest spot (c) read a QR code (d) hear a whistle
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 30. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors
31. 31.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
32. 32.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
34. 34.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
35. 35.🧭 A robot should turn right 45°, but its gyro shows it turned 42°. How many degrees must it turn more to the right?
36. 36.🔍 Which sensor helps a robot follow a black line? (a) a gyro sensor (b) a sound sensor (c) a distance sensor (d) a light sensor
37. 37.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a gear (c) a wheel (d) an input
38. 38.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) driver teeth (d) motor volts
39. 39.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 36. What is under the sensor? (a) the white floor (b) the black line
40. 40.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a cow (c) a snail (d) a bat

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