Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 669 · 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: “a hospital corridor” suits tracks. (a) False (b) True
2. 2.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
3. 3.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a gyro sensor (d) a touch sensor
4. 4.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
5. 5.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) water drops (c) radio music (d) bright light
6. 6.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and right (b) points straight up (c) points left (d) points up and left
7. 7.Which of these suits tracks? (a) a smooth classroom floor (b) a hospital corridor (c) flying over a field (d) soft snow
8. 8.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
9. 9.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
10. 10.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) wheel size (d) motor volts
12. 12.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 20. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
13. 13.🛞 Circumference = π × … (a) weight (b) diameter (c) radius only (d) speed
14. 14.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 24. What is under the sensor? (a) the white floor (b) the black line
15. 15.🧭 A robot faces south. It does: turn left, turn left, turn right, turn right. Which way does it face now? (a) west (b) south (c) east (d) north
16. 16.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) harder to balance (c) they never tire (d) they are too cheap
17. 17.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a servo (b) a gear (c) a track (d) a caster wheel
18. 18.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.True or false: “stepping over wide gaps” suits legs. (a) False (b) True
20. 20.📡 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) Yes (b) No
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 75. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
22. 22.🔍 Which sensor helps a robot stay balanced upright? (a) a gyro sensor (b) a temperature sensor (c) a touch sensor (d) a distance sensor
23. 23.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
25. 25.🔍 Which sensor helps a robot know a button is pressed? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a touch sensor
26. 26.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 308 cm?
27. 27.True or false: “loose sand dunes” suits tracks. (a) True (b) False
28. 28.🧭 A robot faces north. It does: turn left, turn around, turn right. Which way does it face now? (a) east (b) north (c) south (d) west
29. 29.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
30. 30.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
31. 31.🧭 A robot should turn right 180°, but its gyro shows it turned 188°. How many degrees must it turn back to the left?
32. 32.🧭 How many degrees is a full turn? (a) 90° (b) 180° (c) 360° (d) 100°
33. 33.Which job needs a touch sensor? (a) know a button is pressed (b) stop before a wall (c) start on a hand clap (d) follow a black line
34. 34.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 880 cm?
35. 35.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
36. 36.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
37. 37.⚙️ 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
38. 38.🔍 Why do robots need sensors? (a) to be heavier (b) to look colourful (c) to know their world (d) to use more power
39. 39.Which of these suits propellers? (a) a smooth classroom floor (b) crossing stepping-stones (c) flying over a field (d) a long factory floor
40. 40.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False

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