Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 24 · 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 servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
2. 2.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.🔍 Which sensor helps a robot find the brightest spot? (a) a light sensor (b) a touch sensor (c) a temperature sensor (d) a distance sensor
4. 4.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
5. 5.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 1 km (c) 340 cm (d) 3 cm
6. 6.True or false: “deep mud” suits legs. (a) True (b) False
7. 7.📡 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)?
8. 8.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.🔍 Which sensor helps a robot measure how far a box is? (a) a gyro sensor (b) a sound sensor (c) a distance sensor (d) a light sensor
10. 10.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
11. 11.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
12. 12.🧭 A robot faces west. It does: turn left, turn left, turn right. Which way does it face now? (a) west (b) south (c) east (d) north
13. 13.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
14. 14.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) propellers (c) tracks (d) wheels
15. 15.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22/7 (c) 22 (d) 2/7
16. 16.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) driver teeth (d) motor volts
17. 17.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) the same direction (c) they do not turn (d) in opposite directions
18. 18.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) not at all (c) faster but weaker (d) at the same speed
19. 19.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
20. 20.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
21. 21.🧭 A robot faces west. It does: turn left, turn around, turn left, turn left. Which way does it face now? (a) west (b) east (c) north (d) south
22. 22.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
23. 23.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
24. 24.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
25. 25.🧭 How many degrees is a full turn? (a) 360° (b) 100° (c) 180° (d) 90°
26. 26.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
27. 27.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 30
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times slower (c) 3 times faster (d) 3 times louder
30. 30.🛞 Which way of moving suits this best: “a flat road”? (a) legs (b) tracks (c) wheels (d) propellers
31. 31.🛞 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) turns left (b) spins left on the spot (c) stays still (d) goes straight forward
32. 32.🧭 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 180°, then left 135°. What does the gyro read now (0° to 359°)?
33. 33.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
34. 34.🔍 Which sensor helps a robot warn if motors get hot? (a) a distance sensor (b) a temperature sensor (c) a sound sensor (d) a light sensor
35. 35.🛞 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 backward. What does the robot do? (a) goes straight forward (b) spins left on the spot (c) turns right (d) goes straight back
36. 36.⚙️ 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
37. 37.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) propellers (b) legs (c) tracks (d) wheels
38. 38.🛞 Which way of moving suits this best: “loose sand dunes”? (a) propellers (b) legs (c) tracks (d) wheels
39. 39.🔍 What does a gyro sensor measure? (a) temperature (b) colour (c) turning (rotation) (d) sound
40. 40.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False

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