Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 740 · 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.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) idler gear (c) driver gear (d) tyre
2. 2.True or false: “hovering over a roof” suits legs. (a) True (b) False
3. 3.⚙️ A motor makes 240 turns a minute with a 20-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
4. 4.🧭 A robot faces east. It does: turn left, turn around, turn around, turn left. Which way does it face now? (a) north (b) east (c) south (d) west
5. 5.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a gear (c) a wheel (d) an input
6. 6.🧭 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 right 30°, then right 60°. What does the gyro read now (0° to 359°)?
7. 7.📡 A robot is 130 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 5 seconds (in cm)?
8. 8.True or false: to know a button is pressed, use a sound sensor. (a) True (b) False
9. 9.True or false: to spot a red ball, use a touch sensor. (a) True (b) False
10. 10.Which job needs a gyro sensor? (a) follow a black line (b) stop before a wall (c) find the brightest spot (d) measure a turn angle
11. 11.🧭 A robot faces west. It does: turn left, turn left, turn around. Which way does it face now? (a) north (b) south (c) west (d) east
12. 12.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 1 km (c) 340 cm (d) 3 cm
13. 13.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
14. 14.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black soaks up light (c) black is loud (d) black is wet
15. 15.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
16. 16.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
19. 19.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
20. 20.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
21. 21.🛞 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?
22. 22.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
23. 23.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
24. 24.📡 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?
25. 25.True or false: “loose sand dunes” suits tracks. (a) False (b) True
26. 26.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
27. 27.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
28. 28.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
29. 29.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
30. 30.🔍 Which sensor helps a robot feel a bump into a wall? (a) a light sensor (b) a touch sensor (c) a temperature sensor (d) a gyro sensor
31. 31.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
33. 33.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
34. 34.Which of these suits wheels? (a) a long factory floor (b) soft snow (c) a field of tall boulders (d) crossing stepping-stones
35. 35.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
36. 36.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) to make it smaller (c) it goes there and back (d) sound is slow
37. 37.🛞 Which way of moving suits this best: “a hospital corridor”? (a) tracks (b) propellers (c) legs (d) wheels
38. 38.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.🔍 Which sensor helps a robot stay balanced upright? (a) a camera (b) a distance sensor (c) a gyro sensor (d) a temperature sensor
40. 40.🧭 How many degrees is a full turn? (a) 360° (b) 100° (c) 180° (d) 90°

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