Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 142 · 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.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
2. 2.⬛ A reading below the threshold means the sensor is over … (a) white (b) the sky (c) water (d) black
3. 3.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.🧭 A robot faces east. It does: turn right, turn right, turn right, turn left. Which way does it face now? (a) north (b) east (c) south (d) west
5. 5.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
6. 6.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) the sensor is half (c) sound is slow (d) it goes there and back
7. 7.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
8. 8.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?
9. 9.⬛ The threshold of a light sensor is … (a) the top speed (b) the wheel size (c) the battery size (d) the black/white cut-off
10. 10.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 7/22 (c) 2/7 (d) 22
11. 11.🧭 A robot spins 45° every second. How many seconds does it take to turn 225°?
12. 12.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
13. 13.🛞 Which way of moving suits this best: “a long factory floor”? (a) propellers (b) tracks (c) legs (d) wheels
14. 14.⚙️ A 60-tooth driver gear turns a 12-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
15. 15.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
16. 16.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
17. 17.🧭 How many degrees is a right-angle turn? (a) 90° (b) 360° (c) 45° (d) 180°
18. 18.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
19. 19.⚙️ A 12-tooth gear drives a 48-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
20. 20.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) tyre (c) idler gear (d) driver gear
21. 21.📡 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?
22. 22.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
23. 23.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?
24. 24.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a wooden box (c) a metal door (d) a flat wall
25. 25.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 47. What is under the sensor? (a) the white floor (b) the black line
26. 26.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is loud (c) black is wet (d) black soaks up light
27. 27.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?
28. 28.📡 A robot is 260 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 15 seconds (in cm)?
29. 29.True or false: to spot a red ball, use a camera. (a) True (b) False
30. 30.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
31. 31.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
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 left 30°, then right 60°. What does the gyro read now (0° to 359°)?
33. 33.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
34. 34.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) big (slow and strong) (d) zero
35. 35.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
36. 36.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) wheel size (c) number of gears (d) driver teeth
37. 37.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 3 cm (d) 34 cm
38. 38.⚙️ A motor makes 200 turns a minute with a 10-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
39. 39.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.🦾 A servo program runs:
    angle = 120
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?

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