Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 434 · 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 most indoor robots use wheels? (a) they float (b) they look funny (c) they climb stairs (d) fast and easy on floors
2. 2.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 90° (d) 360°
3. 3.True or false: “stepping over wide gaps” suits legs. (a) False (b) True
4. 4.⚙️ A 15-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
5. 5.🧭 A robot faces west. It does: turn left, turn left. Which way does it face now? (a) north (b) west (c) east (d) south
6. 6.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
7. 7.🛞 Circumference = π × … (a) weight (b) diameter (c) radius only (d) speed
8. 8.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
9. 9.🧭 A robot faces south. It does: turn left, turn around, turn left. Which way does it face now? (a) north (b) west (c) south (d) east
10. 10.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) legs (c) tracks (d) propellers
11. 11.📡 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)?
12. 12.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) pins (c) tyres (d) teeth
13. 13.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.🧭 A robot should turn right 45°, but its gyro shows it turned 46°. How many degrees must it turn back to the left?
16. 16.🦾 A servo moves from 20° to 50°. How many degrees does it turn?
17. 17.⬛ A reading below the threshold means the sensor is over … (a) black (b) the sky (c) water (d) white
18. 18.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
19. 19.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
20. 20.Which of these suits legs? (a) crossing stepping-stones (b) hovering over a roof (c) a long factory floor (d) a hospital corridor
21. 21.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
22. 22.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) legs (c) tracks (d) propellers
23. 23.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 154 cm?
24. 24.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
25. 25.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.🔍 Which sensor helps a robot hear a whistle? (a) a camera (b) a sound sensor (c) a distance sensor (d) a touch sensor
27. 27.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
28. 28.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
29. 29.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 58. What is under the sensor? (a) the black line (b) the white floor
31. 31.🦾 A servo moves from 80° to 180°. How many degrees does it turn?
32. 32.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
33. 33.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) in opposite directions (c) they do not turn (d) one up, one down
34. 34.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle + 20
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
36. 36.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
37. 37.🧭 A robot faces north. It does: turn right, turn right, turn left, turn right. Which way does it face now? (a) west (b) east (c) north (d) south
38. 38.🔍 Which sensor helps a robot spot a red ball? (a) a gyro sensor (b) a sound sensor (c) a touch sensor (d) a camera
39. 39.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
40. 40.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 352 cm?

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