Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 793 · 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.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
2. 2.⚙️ A 12-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 70. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 35. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
5. 5.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
6. 6.⚙️ 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
7. 7.True or false: to follow a black line, use a light sensor. (a) True (b) False
8. 8.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True
9. 9.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
10. 10.⬛ The threshold of a light sensor is … (a) the battery size (b) the wheel size (c) the black/white cut-off (d) the top speed
11. 11.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 360° (d) 45°
12. 12.Which job needs a touch sensor? (a) warn if motors get hot (b) know a button is pressed (c) read a QR code (d) stay balanced upright
13. 13.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) tyres (c) pins (d) spokes
14. 14.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
15. 15.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle − 50
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
16. 16.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times louder (c) 3 times faster (d) 3 times slower
17. 17.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 20. What is under the sensor? (a) the white floor (b) the black line
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.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
20. 20.⚙️ A motor makes 200 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
21. 21.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
22. 22.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.Which of these suits tracks? (a) loose sand dunes (b) flying over a field (c) a field of tall boulders (d) hovering over a roof
24. 24.Which of these suits propellers? (a) flying over a field (b) loose sand dunes (c) deep mud (d) a field of tall boulders
25. 25.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
27. 27.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 2 (c) 4 (d) 3
28. 28.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) propellers (c) wheels (d) tracks
29. 29.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a bat (c) a snail (d) a cow
30. 30.🔍 Which sensor helps a robot know a button is pressed? (a) a temperature sensor (b) a gyro sensor (c) a touch sensor (d) a light sensor
31. 31.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
33. 33.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 45° (c) 90° (d) 360°
34. 34.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 55. What is under the sensor? (a) the black line (b) the white floor
35. 35.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a distance sensor (c) a gyro sensor (d) a touch sensor
36. 36.⚙️ A motor makes 200 turns a minute with a 20-tooth gear on it. That gear drives a 100-tooth gear. How many turns a minute does the 100-tooth gear make?
37. 37.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) nowhere (c) slower (d) faster
38. 38.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its circumference (d) its radius
39. 39.True or false: to find the brightest spot, use a light sensor. (a) False (b) True
40. 40.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) black (c) white (d) water

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