Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 557 · 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 135°. Where does the arm point? (a) points right (b) points left (c) points up and right (d) points up and left
2. 2.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 25. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
3. 3.True or false: to feel a bump into a wall, use a temperature sensor. (a) False (b) True
4. 4.🔍 Why do robots need sensors? (a) to look colourful (b) to be heavier (c) to know their world (d) to use more power
5. 5.📡 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)?
6. 6.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
7. 7.🛞 Why do most indoor robots use wheels? (a) they look funny (b) fast and easy on floors (c) they climb stairs (d) they float
8. 8.⚙️ A motor makes 400 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
10. 10.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) turns left (b) goes straight back (c) goes straight forward (d) spins left on the spot
11. 11.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
12. 12.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
13. 13.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
14. 14.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 360° (c) 90° (d) 180°
15. 15.🧭 A robot should turn right 90°, but its gyro shows it turned 102°. How many degrees must it turn back to the left?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
17. 17.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
18. 18.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they are too cheap (c) they never tire (d) harder to balance
19. 19.🧭 A robot should turn right 180°, but its gyro shows it turned 170°. How many degrees must it turn more to the right?
20. 20.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) sound too high to hear (d) bright light
21. 21.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
23. 23.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
24. 24.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
25. 25.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 50 times. How many times does the driven gear turn?
26. 26.🧭 How many degrees is a full turn? (a) 100° (b) 90° (c) 360° (d) 180°
27. 27.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 17. What is under the sensor? (a) the white floor (b) the black line
28. 28.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) slower (c) nowhere (d) backwards
29. 29.⚙️ A motor makes 140 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
30. 30.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) white (c) black (d) water
31. 31.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
32. 32.🧭 A robot faces west. It does: turn around, turn left, turn around, turn right. Which way does it face now? (a) north (b) south (c) west (d) east
33. 33.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
34. 34.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points right (b) points up and right (c) points left (d) points straight up
35. 35.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
36. 36.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 27. What is under the sensor? (a) the white floor (b) the black line
38. 38.True or false: “flying over a field” suits tracks. (a) False (b) True
39. 39.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) tyres (c) pins (d) teeth
40. 40.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 85. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors

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