Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 364 · 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.True or false: “a long factory floor” suits wheels. (a) True (b) False
2. 2.True or false: “the output turns faster” happens when a big gear drives a small one. (a) True (b) False
3. 3.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
4. 4.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
5. 5.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
6. 6.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times faster (c) 3 times louder (d) 3 times bigger
7. 7.Which of these suits tracks? (a) a muddy building site (b) a long factory floor (c) a field of tall boulders (d) crossing stepping-stones
8. 8.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 71. What is under the sensor? (a) the white floor (b) the black line
9. 9.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) motor volts (d) number of gears
10. 10.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
11. 11.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) under the right sensor (d) far behind it
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
13. 13.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
14. 14.Which job needs a distance sensor? (a) know a button is pressed (b) start on a hand clap (c) read a QR code (d) measure how far a box is
15. 15.🧭 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 left 30°. What does the gyro read now (0° to 359°)?
16. 16.True or false: “a hospital corridor” suits tracks. (a) False (b) True
17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
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 270°. It turns right 135°, then right 90°. What does the gyro read now (0° to 359°)?
19. 19.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 50
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ A 24-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
21. 21.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 22. What is under the sensor? (a) the black line (b) the white floor
22. 22.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22/7 (c) 2/7 (d) 22
23. 23.🧭 A robot should turn right 180°, but its gyro shows it turned 195°. How many degrees must it turn back to the left?
24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
25. 25.Which of these suits tracks? (a) deep mud (b) a smooth classroom floor (c) stepping over wide gaps (d) a flat road
26. 26.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
27. 27.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.Which job needs a gyro sensor? (a) stop before a wall (b) find the brightest spot (c) measure a turn angle (d) spot a red ball
29. 29.Which of these suits propellers? (a) a flat road (b) deep mud (c) stepping over wide gaps (d) hovering over a roof
30. 30.🦾 A servo program runs:
    angle = 60
    angle = angle − 60
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
31. 31.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.🧭 A robot spins 30° every second. How many seconds does it take to turn 90°?
33. 33.🔍 What does a gyro sensor measure? (a) sound (b) temperature (c) colour (d) turning (rotation)
34. 34.True or false: to measure a turn angle, use a gyro sensor. (a) False (b) True
35. 35.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
36. 36.🔍 Why do robots need sensors? (a) to be heavier (b) to look colourful (c) to use more power (d) to know their world
37. 37.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
38. 38.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
39. 39.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
40. 40.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 45° (c) 360° (d) 90°

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