Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 569 · 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.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
2. 2.🧭 A robot faces west. It does: turn around, turn right, turn around. Which way does it face now? (a) east (b) south (c) north (d) west
3. 3.⬛ A reading below the threshold means the sensor is over … (a) black (b) the sky (c) water (d) white
4. 4.Which job needs a touch sensor? (a) read a QR code (b) stay balanced upright (c) feel a bump into a wall (d) stop before a wall
5. 5.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
6. 6.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
7. 7.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 35. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
8. 8.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) True (b) False
9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
10. 10.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) big (slow and strong) (d) zero
11. 11.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) an output (c) a wheel (d) a gear
12. 12.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
13. 13.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
14. 14.🔍 Which sensor helps a robot warn if motors get hot? (a) a gyro sensor (b) a temperature sensor (c) a light sensor (d) a sound sensor
15. 15.Which job needs a gyro sensor? (a) spot a red ball (b) find the brightest spot (c) stay balanced upright (d) know a button is pressed
16. 16.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
17. 17.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
18. 18.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 80. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
20. 20.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
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 180°. It turns left 180°, then left 45°. What does the gyro read now (0° to 359°)?
22. 22.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
23. 23.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
24. 24.True or false: “loose sand dunes” suits legs. (a) False (b) True
25. 25.🧭 A robot spins 30° every second. How many seconds does it take to turn 90°?
26. 26.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
27. 27.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
28. 28.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) not at all (c) at the same speed (d) slower but stronger
29. 29.🦾 A servo program runs:
    angle = 110
    angle = angle − 10
    angle = angle + 60
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
31. 31.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
32. 32.📡 A robot is 290 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 4 seconds (in cm)?
33. 33.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
34. 34.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
35. 35.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 43. What is under the sensor? (a) the white floor (b) the black line
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
37. 37.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
38. 38.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 63. What is under the sensor? (a) the black line (b) the white floor
40. 40.True or false: to follow a black line, use a distance sensor. (a) True (b) False

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