Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 124 · 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.📡 Why do we halve the echo’s total path? (a) sound is slow (b) the sensor is half (c) it goes there and back (d) to make it smaller
2. 2.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
3. 3.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) between the two sensors (c) under the left sensor (d) under the right sensor
4. 4.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
5. 5.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) too fast on floors (c) they are too cheap (d) they never tire
6. 6.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) idler gear (c) tyre (d) driver gear
7. 7.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
8. 8.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
11. 11.🧭 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 right 180°, then left 120°, then left 120°. What does the gyro read now (0° to 359°)?
12. 12.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) wheel size (d) driver teeth
13. 13.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
14. 14.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
16. 16.⚙️ 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
17. 17.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
18. 18.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
19. 19.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a wheel (c) an input (d) a gear
20. 20.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) propellers (c) wheels (d) tracks
21. 21.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
22. 22.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 39. What is under the sensor? (a) the white floor (b) the black line
23. 23.Which of these suits tracks? (a) a field of tall boulders (b) loose sand dunes (c) a smooth classroom floor (d) a flat road
24. 24.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
25. 25.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
26. 26.🔍 Which sensor helps a robot follow a black line? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
27. 27.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.Which job needs a sound sensor? (a) measure a turn angle (b) start on a hand clap (c) stay balanced upright (d) measure how far a box is
29. 29.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 40
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
31. 31.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 30. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
33. 33.🧭 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 60°, then right 90°. What does the gyro read now (0° to 359°)?
34. 34.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the wheel size (c) the top speed (d) the battery size
36. 36.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
37. 37.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
38. 38.🔦 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 white floor (b) the black line
39. 39.⚙️ A 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
40. 40.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big

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