Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 264 · 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.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the battery size (c) the wheel size (d) the top speed
2. 2.True or false: to hear a whistle, use a touch sensor. (a) True (b) False
3. 3.True or false: to stay balanced upright, use a gyro sensor. (a) True (b) False
4. 4.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) wheel size (d) driver teeth
5. 5.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
6. 6.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 35. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
7. 7.⚙️ A 10-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
8. 8.True or false: “a long factory floor” suits legs. (a) True (b) False
9. 9.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
10. 10.True or false: “a hospital corridor” suits legs. (a) False (b) True
11. 11.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
12. 12.Which job needs a light sensor? (a) feel a bump into a wall (b) know a button is pressed (c) measure a turn angle (d) find the brightest spot
13. 13.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
14. 14.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) they do not turn (c) the same direction (d) in opposite directions
15. 15.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
16. 16.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
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 straight up (b) points up and left (c) points left (d) points right
18. 18.True or false: to hear a whistle, use a sound sensor. (a) True (b) False
19. 19.⬛ A reading below the threshold means the sensor is over … (a) water (b) black (c) the sky (d) white
20. 20.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times slower (c) 3 times louder (d) 3 times bigger
23. 23.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 36. What is under the sensor? (a) the black line (b) the white floor
24. 24.🔍 What does a gyro sensor measure? (a) turning (rotation) (b) temperature (c) colour (d) sound
25. 25.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) smell smoke (c) see colours (d) hear claps
26. 26.⚙️ A 36-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
27. 27.🛞 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 forward. What does the robot do? (a) stays still (b) spins right on the spot (c) turns left (d) spins left on the spot
28. 28.Which of these suits wheels? (a) loose sand dunes (b) moving under water (c) deep mud (d) a smooth classroom floor
29. 29.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
30. 30.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
31. 31.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) between the two sensors (c) under the left sensor (d) under the right sensor
32. 32.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
33. 33.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
34. 34.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
35. 35.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
36. 36.🛞 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?
37. 37.🦾 A servo program runs:
    angle = 110
    angle = angle − 60
    angle = angle + 10
    angle = angle + 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
38. 38.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a servo (c) a caster wheel (d) a gear
39. 39.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle + 20
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True

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