Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 794 · 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.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
2. 2.⚙️ A 60-tooth driver gear turns a 15-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
3. 3.🦾 A servo moves from 0° to 70°. How many degrees does it turn?
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 10. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
5. 5.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) far behind it (c) under the right sensor (d) between the two sensors
6. 6.Which of these suits legs? (a) a muddy building site (b) stepping over wide gaps (c) moving under water (d) a hospital corridor
7. 7.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it uses a sail (c) it jumps (d) it stops for ever
8. 8.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 340 cm (c) 1 km (d) 3 cm
9. 9.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
10. 10.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 9. What is under the sensor? (a) the white floor (b) the black line
11. 11.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
13. 13.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True
14. 14.🧭 What does a gyro help a robot do? (a) see colours (b) turn by exact angles (c) hear claps (d) smell smoke
15. 15.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they never tire (c) they are too cheap (d) harder to balance
16. 16.🧭 A robot faces north. It does: turn right, turn right, turn left. Which way does it face now? (a) south (b) west (c) east (d) north
17. 17.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
18. 18.📡 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) Yes (b) No
19. 19.🧭 A robot spins 90° every second. How many seconds does it take to turn 180°?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
21. 21.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
22. 22.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
23. 23.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
25. 25.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 60. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
26. 26.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
27. 27.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
28. 28.🧭 A robot spins 60° every second. How many seconds does it take to turn 240°?
29. 29.🧭 A robot should turn right 180°, but its gyro shows it turned 190°. How many degrees must it turn back to the left?
30. 30.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) slower (c) nowhere (d) backwards
31. 31.🧭 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 90°. It turns right 135°, then left 180°. What does the gyro read now (0° to 359°)?
32. 32.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
33. 33.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
34. 34.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
35. 35.⚙️ A 30-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
36. 36.True or false: to measure how far a box is, use a gyro sensor. (a) False (b) True
37. 37.🔍 Which sensor helps a robot know a button is pressed? (a) a light sensor (b) a touch sensor (c) a gyro sensor (d) a distance sensor
38. 38.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?
39. 39.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
40. 40.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) one up, one down (c) the same direction (d) in opposite directions

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