Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 916 · 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 wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
3. 3.🧭 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 90°. It turns left 30°, then left 180°, then left 120°. What does the gyro read now (0° to 359°)?
4. 4.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
5. 5.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) small (fast, weak) (d) zero
6. 6.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is wet (c) black soaks up light (d) black is loud
7. 7.🔍 Which sensor helps a robot measure a turn angle? (a) a temperature sensor (b) a camera (c) a gyro sensor (d) a sound sensor
8. 8.🧭 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 90°. It turns left 180°, then left 120°, then left 30°. What does the gyro read now (0° to 359°)?
9. 9.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.⚙️ A 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
11. 11.True or false: “moving under water” suits wheels. (a) True (b) False
12. 12.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it uses a sail (c) it jumps (d) one wheel runs faster
13. 13.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
15. 15.📡 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)?
16. 16.⚙️ 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
17. 17.🔍 Which sensor helps a robot start on a hand clap? (a) a sound sensor (b) a temperature sensor (c) a light sensor (d) a gyro sensor
18. 18.Which of these suits tracks? (a) deep mud (b) hovering over a roof (c) a field of tall boulders (d) a flat road
19. 19.🧭 A robot should turn right 90°, but its gyro shows it turned 86°. How many degrees must it turn more to the right?
20. 20.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 95. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
21. 21.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
22. 22.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a touch sensor (c) a sound sensor (d) a gyro sensor
23. 23.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) an input (c) a wheel (d) a gear
24. 24.⚙️ A 15-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
25. 25.🧭 A robot spins 15° every second. How many seconds does it take to turn 210°?
26. 26.🔍 Which sensor helps a robot measure how far a box is? (a) a temperature sensor (b) a gyro sensor (c) a distance sensor (d) a camera
27. 27.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) propellers (b) legs (c) wheels (d) tracks
28. 28.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle + 20
    angle = angle + 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
29. 29.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) turns right (b) spins left on the spot (c) spins right on the spot (d) goes straight forward
30. 30.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
31. 31.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 52. What is under the sensor? (a) the black line (b) the white floor
32. 32.🧭 How many degrees is a full turn? (a) 360° (b) 100° (c) 180° (d) 90°
33. 33.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
34. 34.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
35. 35.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 25. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
37. 37.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
38. 38.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 20. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
40. 40.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?

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