Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 643 · 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 has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 60. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
2. 2.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 176 cm?
3. 3.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 15. What is under the sensor? (a) the white floor (b) the black line
4. 4.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
5. 5.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
6. 6.🧭 A robot should turn right 45°, but its gyro shows it turned 49°. How many degrees must it turn back to the left?
7. 7.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) at the same speed (c) not at all (d) faster but weaker
8. 8.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
9. 9.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
10. 10.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
11. 11.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
12. 12.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is loud (d) black is hot
13. 13.🧭 A robot spins 15° every second. How many seconds does it take to turn 75°?
14. 14.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
15. 15.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
17. 17.True or false: “soft snow” suits wheels. (a) True (b) False
18. 18.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 60
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
22. 22.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) bright light (d) sound too high to hear
23. 23.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
24. 24.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
25. 25.🧭 What does a gyro help a robot do? (a) hear claps (b) see colours (c) smell smoke (d) turn by exact angles
26. 26.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 4 (c) 3 (d) 2
27. 27.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) turns right (b) goes straight back (c) goes straight forward (d) spins left on the spot
28. 28.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
29. 29.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
30. 30.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
31. 31.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
32. 32.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
33. 33.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.Which of these suits legs? (a) crossing stepping-stones (b) flying over a field (c) hovering over a roof (d) a smooth classroom floor
35. 35.🔍 Which sensor helps a robot follow a black line? (a) a temperature sensor (b) a light sensor (c) a camera (d) a gyro sensor
36. 36.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
37. 37.🦾 A servo moves from 150° to 0°. How many degrees does it turn?
38. 38.🛞 Which way of moving suits this best: “soft snow”? (a) wheels (b) legs (c) tracks (d) propellers
39. 39.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 352 cm?
40. 40.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor

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