Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 401 · 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.Which of these suits wheels? (a) moving under water (b) deep mud (c) flying over a field (d) a flat road
2. 2.🧭 A robot should turn right 45°, but its gyro shows it turned 53°. How many degrees must it turn back to the left?
3. 3.🦾 A servo program runs:
   angle = 40
   angle = angle + 10
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
4. 4.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
5. 5.⬛ The threshold of a light sensor is … (a) the wheel size (b) the top speed (c) the battery size (d) the black/white cut-off
6. 6.⚙️ 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
7. 7.Which of these suits tracks? (a) crossing stepping-stones (b) moving under water (c) deep mud (d) hovering over a roof
8. 8.🧭 A robot should turn right 45°, but its gyro shows it turned 32°. How many degrees must it turn more to the right?
9. 9.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 35. What is under the sensor? (a) the black line (b) the white floor
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
11. 11.🧭 A robot spins 30° every second. How many seconds does it take to turn 120°?
12. 12.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
13. 13.🧭 How many degrees is a full turn? (a) 360° (b) 100° (c) 90° (d) 180°
14. 14.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) propellers (c) legs (d) tracks
15. 15.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 90° (c) 180° (d) 360°
16. 16.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
17. 17.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) never important (c) small (fast, weak) (d) big (slow and strong)
18. 18.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spin in the air (c) they are shiny (d) they spread the weight
19. 19.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
20. 20.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) legs (c) propellers (d) tracks
21. 21.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
22. 22.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
23. 23.True or false: to find the brightest spot, use a light sensor. (a) True (b) False
24. 24.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
25. 25.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
26. 26.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) nowhere (c) faster (d) backwards
27. 27.🧭 How many degrees is a right-angle turn? (a) 90° (b) 360° (c) 45° (d) 180°
28. 28.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
29. 29.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
30. 30.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
31. 31.🛞 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 2 times. How far does the robot roll (in cm)?
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 15. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
33. 33.Which job needs a light sensor? (a) follow a black line (b) measure how far a box is (c) measure a turn angle (d) stay balanced upright
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.⚙️ An 8-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
36. 36.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driver turns 32 times. How many times does the driven gear turn?
37. 37.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) wheels (b) tracks (c) legs (d) propellers
38. 38.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) the sky (d) black
39. 39.🛞 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?
40. 40.True or false: “hovering over a roof” suits tracks. (a) False (b) True

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