Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 471 · 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 gets the most reflected light from … (a) a white surface (b) a black surface (c) a dark tunnel (d) a black line
2. 2.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
3. 3.🔦 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) neither sensor (c) the left sensor (d) both sensors
4. 4.🦾 A servo program runs:
   angle = 110
   angle = angle − 20
   angle = angle − 20
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
5. 5.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
6. 6.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
7. 7.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
8. 8.True or false: to start on a hand clap, use a sound sensor. (a) True (b) False
9. 9.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
10. 10.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its circumference (d) its radius
11. 11.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) they float (d) fast and easy on floors
12. 12.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
13. 13.True or false: to measure a turn angle, use a sound sensor. (a) True (b) False
14. 14.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
15. 15.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
16. 16.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
17. 17.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
18. 18.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) far behind it (d) under the right sensor
19. 19.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
20. 20.🧭 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 90°, then left 120°, then right 30°. What does the gyro read now (0° to 359°)?
21. 21.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
22. 22.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
23. 23.Which of these suits propellers? (a) a long factory floor (b) a smooth classroom floor (c) a field of tall boulders (d) flying over a field
24. 24.True or false: to spot a red ball, use a camera. (a) True (b) False
25. 25.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 22. What is under the sensor? (a) the black line (b) the white floor
26. 26.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) turn by exact angles (d) see colours
27. 27.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) tracks (b) legs (c) wheels (d) propellers
28. 28.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
29. 29.⬛ A reading below the threshold means the sensor is over … (a) water (b) black (c) white (d) the sky
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
31. 31.🔍 Which sensor helps a robot know a button is pressed? (a) a camera (b) a temperature sensor (c) a distance sensor (d) a touch sensor
32. 32.True or false: to start on a hand clap, use a gyro sensor. (a) True (b) False
33. 33.🛞 Which way of moving suits this best: “a flat road”? (a) wheels (b) legs (c) tracks (d) propellers
34. 34.True or false: “moving under water” suits wheels. (a) True (b) False
35. 35.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
38. 38.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
39. 39.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
40. 40.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?

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