Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 21 · 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 reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
2. 2.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
5. 5.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.True or false: “a flat road” suits wheels. (a) True (b) False
7. 7.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
8. 8.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
9. 9.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
10. 10.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
11. 11.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) faster (c) nowhere (d) slower
12. 12.🛞 Which way of moving suits this best: “a flat road”? (a) wheels (b) propellers (c) tracks (d) legs
13. 13.⚙️ An 8-tooth gear drives a 32-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
14. 14.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 42. What is under the sensor? (a) the black line (b) the white floor
15. 15.🧭 A robot faces south. It does: turn left, turn right, turn around, turn around. Which way does it face now? (a) north (b) west (c) east (d) south
16. 16.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
17. 17.🧭 A robot should turn right 90°, but its gyro shows it turned 97°. How many degrees must it turn back to the left?
18. 18.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) they float (d) fast and easy on floors
19. 19.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
21. 21.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
22. 22.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 220 cm?
23. 23.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ 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
25. 25.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a soft foam cushion (c) a metal door (d) a flat wall
26. 26.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
27. 27.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.🔍 Which sensor helps a robot find the brightest spot? (a) a gyro sensor (b) a sound sensor (c) a touch sensor (d) a light sensor
29. 29.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
30. 30.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
31. 31.⚙️ A motor makes 120 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
32. 32.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
34. 34.🔦 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 white floor (b) the black line
35. 35.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
36. 36.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
37. 37.🔍 Why do robots need sensors? (a) to use more power (b) to be heavier (c) to know their world (d) to look colourful
38. 38.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
39. 39.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) water drops (c) radio music (d) sound too high to hear
40. 40.True or false: “spins round and round” is true of a servo motor. (a) False (b) True

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