Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 767 · 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.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) they do not turn (c) in opposite directions (d) one up, one down
2. 2.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
3. 3.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 19. What is under the sensor? (a) the white floor (b) the black line
4. 4.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the right sensor (c) under the left sensor (d) far behind it
5. 5.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
6. 6.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) turns right (b) goes straight back (c) turns left (d) goes straight forward
7. 7.🛞 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)? =
8. 8.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 4 (c) 2 (d) 3
9. 9.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
10. 10.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
11. 11.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.🧭 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 270°. It turns right 30°, then right 90°. What does the gyro read now (0° to 359°)?
13. 13.🧭 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 0°. It turns left 90°, then left 90°, then left 30°. What does the gyro read now (0° to 359°)?
14. 14.True or false: “crossing stepping-stones” suits tracks. (a) True (b) False
15. 15.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) wheel size (d) number of gears
16. 16.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a wheel (c) an output (d) a gear
17. 17.🦾 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 up and left (b) points right (c) points left (d) points up and right
18. 18.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
19. 19.🔍 Which sensor helps a robot read a QR code? (a) a gyro sensor (b) a touch sensor (c) a camera (d) a light sensor
20. 20.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
21. 21.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is wet (c) black is loud (d) black soaks up light
22. 22.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) at the same speed (d) slower but stronger
23. 23.🔍 Which sensor helps a robot hear a whistle? (a) a sound sensor (b) a camera (c) a gyro sensor (d) a light sensor
24. 24.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
25. 25.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 10. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
26. 26.🔍 Which sensor helps a robot feel a bump into a wall? (a) a light sensor (b) a touch sensor (c) a sound sensor (d) a distance sensor
27. 27.🛞 Which way of moving suits this best: “moving under water”? (a) tracks (b) propellers (c) legs (d) wheels
28. 28.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
29. 29.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
30. 30.🔍 Why do robots need sensors? (a) to be heavier (b) to know their world (c) to use more power (d) to look colourful
31. 31.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 70. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
32. 32.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
33. 33.⬛ The threshold of a light sensor is … (a) the wheel size (b) the battery size (c) the black/white cut-off (d) the top speed
34. 34.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) sound is slow (c) it goes there and back (d) to make it smaller
35. 35.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.🛞 Why do most indoor robots use wheels? (a) they float (b) they look funny (c) they climb stairs (d) fast and easy on floors
37. 37.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
38. 38.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
40. 40.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) tracks (c) propellers (d) legs

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