Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 402 · 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.🛞 Which way of moving suits this best: “a muddy building site”? (a) propellers (b) wheels (c) tracks (d) legs
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 0°. It turns left 30°, then left 135°. What does the gyro read now (0° to 359°)?
3. 3.🦾 A servo program runs:
   angle = 160
   angle = angle − 50
   angle = angle + 40
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
4. 4.🔍 Which sensor helps a robot read a QR code? (a) a distance sensor (b) a light sensor (c) a camera (d) a sound sensor
5. 5.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) faster (c) backwards (d) slower
6. 6.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
7. 7.⚙️ A 24-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
8. 8.🧭 A robot should turn right 90°, but its gyro shows it turned 78°. How many degrees must it turn more to the right?
9. 9.⬛ The threshold of a light sensor is … (a) the wheel size (b) the battery size (c) the black/white cut-off (d) the top speed
10. 10.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 21. What is under the sensor? (a) the white floor (b) the black line
11. 11.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 39. What is under the sensor? (a) the white floor (b) the black line
12. 12.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) turn by exact angles (d) see colours
13. 13.⬛ A reading below the threshold means the sensor is over … (a) water (b) white (c) black (d) the sky
14. 14.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
15. 15.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 60. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
16. 16.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.🔍 Which sensor helps a robot measure how far a box is? (a) a temperature sensor (b) a distance sensor (c) a camera (d) a sound sensor
18. 18.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
19. 19.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
20. 20.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
21. 21.🧭 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°)?
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.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
24. 24.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
25. 25.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
27. 27.⚙️ A motor makes 600 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
28. 28.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
29. 29.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
30. 30.Which of these suits wheels? (a) moving under water (b) crossing stepping-stones (c) a smooth classroom floor (d) a muddy building site
31. 31.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
32. 32.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
33. 33.🧭 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 right 45°, then right 60°. What does the gyro read now (0° to 359°)?
34. 34.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
35. 35.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 1 (c) 3 (d) 2
36. 36.Which job needs a touch sensor? (a) find the brightest spot (b) know a button is pressed (c) spot a red ball (d) warn if motors get hot
37. 37.True or false: to find the brightest spot, use a light sensor. (a) True (b) False
38. 38.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its diameter (c) its radius (d) its weight
39. 39.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
40. 40.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes

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