Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 341 · 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 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
2. 2.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
3. 3.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
5. 5.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
6. 6.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
7. 7.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
8. 8.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
9. 9.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
10. 10.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
11. 11.Which of these suits propellers? (a) deep mud (b) a flat road (c) hovering over a roof (d) stepping over wide gaps
12. 12.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they climb stairs (c) they float (d) fast and easy on floors
13. 13.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) faster (c) nowhere (d) slower
14. 14.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
15. 15.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) tracks (c) propellers (d) wheels
16. 16.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they never tire (c) harder to balance (d) they are too cheap
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 15. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
18. 18.🧭 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 135°, then left 180°, then left 180°. What does the gyro read now (0° to 359°)?
19. 19.🧭 A robot faces south. It does: turn around, turn right, turn around, turn right. Which way does it face now? (a) north (b) west (c) south (d) east
20. 20.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
21. 21.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a servo (c) a gear (d) a track
22. 22.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
23. 23.True or false: to hear a whistle, use a sound sensor. (a) True (b) False
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
26. 26.🔍 Which sensor helps a robot stay balanced upright? (a) a touch sensor (b) a distance sensor (c) a light sensor (d) a gyro sensor
27. 27.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a soft foam cushion (c) a wooden box (d) a flat wall
28. 28.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 40. What is under the sensor? (a) the black line (b) the white floor
29. 29.🔍 Which sensor helps a robot start on a hand clap? (a) a distance sensor (b) a sound sensor (c) a touch sensor (d) a light sensor
30. 30.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) goes straight back (b) stays still (c) goes straight forward (d) spins left on the spot
31. 31.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
32. 32.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
34. 34.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) spins right on the spot (b) turns left (c) turns right (d) spins left on the spot
35. 35.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) an output (c) a gear (d) a wheel
36. 36.🧭 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 135°, then left 60°. What does the gyro read now (0° to 359°)?
37. 37.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
38. 38.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
39. 39.🛞 Which way of moving suits this best: “hovering over a roof”? (a) legs (b) wheels (c) tracks (d) propellers
40. 40.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?

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