Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 849 · 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 arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and right (b) points left (c) points up and left (d) points straight up
2. 2.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
3. 3.🧭 A robot faces east. It does: turn around, turn left, turn left, turn right. Which way does it face now? (a) south (b) east (c) north (d) west
4. 4.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
5. 5.🧭 A robot should turn right 180°, but its gyro shows it turned 193°. How many degrees must it turn back to the left?
6. 6.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
7. 7.Which of these suits tracks? (a) deep mud (b) moving under water (c) a smooth classroom floor (d) crossing stepping-stones
8. 8.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 85. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
9. 9.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
10. 10.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
12. 12.🧭 A robot spins 45° every second. How many seconds does it take to turn 90°?
13. 13.🦾 A servo moves from 110° to 180°. How many degrees does it turn?
14. 14.True or false: to feel a bump into a wall, use a distance sensor. (a) True (b) False
15. 15.🛞 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 right on the spot (c) stays still (d) spins left on the spot
16. 16.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
17. 17.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 45° (c) 180° (d) 90°
19. 19.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 10
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
20. 20.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
21. 21.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 340 cm (c) 1 km (d) 3 cm
22. 22.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) tyres (c) pins (d) teeth
23. 23.🧭 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 left 60°, then right 30°, then right 90°. What does the gyro read now (0° to 359°)?
24. 24.📡 Why do we halve the echo’s total path? (a) sound is slow (b) to make it smaller (c) the sensor is half (d) it goes there and back
25. 25.⚙️ A motor makes 400 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?
26. 26.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
28. 28.⚙️ A 15-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
29. 29.Which of these suits legs? (a) flying over a field (b) crossing stepping-stones (c) moving under water (d) a flat road
30. 30.🧭 A robot faces south. It does: turn left, turn around. Which way does it face now? (a) south (b) north (c) east (d) west
31. 31.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 19. What is under the sensor? (a) the white floor (b) the black line
33. 33.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
34. 34.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
35. 35.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
36. 36.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
37. 37.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
38. 38.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it stops for ever (c) one wheel runs faster (d) it jumps
39. 39.🦾 A servo program runs:
    angle = 120
    angle = angle + 20
    angle = angle + 40
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False

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