Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 764 · 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 45-tooth driver gear turns a 15-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
3. 3.True or false: to stay balanced upright, use a light sensor. (a) True (b) False
4. 4.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 21 times. How many times does the driven gear turn?
5. 5.🦾 A servo program runs:
   angle = 50
   angle = angle − 50
   angle = angle + 60
   angle = angle + 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
7. 7.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a cow (d) a bat
8. 8.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 12. What is under the sensor? (a) the black line (b) the white floor
9. 9.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) water drops (c) radio music (d) bright light
10. 10.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 61. What is under the sensor? (a) the white floor (b) the black line
11. 11.True or false: to spot a red ball, use a sound sensor. (a) True (b) False
12. 12.Which of these suits legs? (a) flying over a field (b) a muddy building site (c) deep mud (d) stepping over wide gaps
13. 13.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its circumference (d) its diameter
14. 14.True or false: to feel a bump into a wall, use a touch sensor. (a) True (b) False
15. 15.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
18. 18.⬛ The threshold of a light sensor is … (a) the top speed (b) the wheel size (c) the black/white cut-off (d) the battery size
19. 19.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
20. 20.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
21. 21.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) goes straight back (b) goes straight forward (c) spins left on the spot (d) stays still
22. 22.⚙️ A 15-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
23. 23.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
24. 24.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
26. 26.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) faster (c) nowhere (d) backwards
27. 27.🛞 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 backward. What does the robot do? (a) goes straight back (b) spins left on the spot (c) stays still (d) spins right on the spot
28. 28.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
29. 29.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
30. 30.True or false: to stop before a wall, use a distance sensor. (a) False (b) True
31. 31.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
33. 33.🧭 How many degrees is a full turn? (a) 90° (b) 360° (c) 100° (d) 180°
34. 34.🔍 Which sensor helps a robot find the brightest spot? (a) a sound sensor (b) a touch sensor (c) a light sensor (d) a gyro sensor
35. 35.Which of these suits propellers? (a) a smooth classroom floor (b) soft snow (c) a field of tall boulders (d) flying over a field
36. 36.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
37. 37.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 14 times. How many times does the driven gear turn?
38. 38.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
39. 39.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True

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