Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 632 · 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.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
2. 2.🔍 Which sensor helps a robot spot a red ball? (a) a sound sensor (b) a touch sensor (c) a camera (d) a light sensor
3. 3.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points left (b) points up and right (c) points right (d) points straight up
4. 4.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
5. 5.🦾 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 right (b) points right (c) points left (d) points straight up
6. 6.🛞 Which way of moving suits this best: “a hospital corridor”? (a) tracks (b) legs (c) wheels (d) propellers
7. 7.⚙️ A 12-tooth gear drives a 48-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
9. 9.🛞 Which way of moving suits this best: “flying over a field”? (a) legs (b) tracks (c) propellers (d) wheels
10. 10.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) fast and easy on floors (c) they look funny (d) they float
11. 11.🔍 Which sensor helps a robot stay balanced upright? (a) a temperature sensor (b) a sound sensor (c) a gyro sensor (d) a touch sensor
12. 12.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
13. 13.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is loud (c) black is wet (d) black soaks up light
14. 14.🔍 Which sensor helps a robot hear a whistle? (a) a distance sensor (b) a temperature sensor (c) a touch sensor (d) a sound sensor
15. 15.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an input (c) an output (d) a wheel
16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
17. 17.True or false: to warn if motors get hot, use a gyro sensor. (a) False (b) True
18. 18.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
19. 19.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
20. 20.🦾 A servo moves from 10° to 50°. How many degrees does it turn?
21. 21.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
22. 22.🧭 A robot should turn right 90°, but its gyro shows it turned 93°. How many degrees must it turn back to the left?
23. 23.Which job needs a temperature sensor? (a) know a button is pressed (b) find the brightest spot (c) warn if motors get hot (d) spot a red ball
24. 24.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
25. 25.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 1 (c) 4 (d) 3
26. 26.🧭 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 45°, then right 45°, then right 90°. What does the gyro read now (0° to 359°)?
27. 27.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
30. 30.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
31. 31.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 15. What is under the sensor? (a) the white floor (b) the black line
32. 32.📡 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)?
33. 33.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.True or false: “soft snow” suits tracks. (a) False (b) True
37. 37.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
38. 38.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a soft foam cushion (c) a wooden box (d) a flat wall
39. 39.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) too fast on floors (c) they never tire (d) harder to balance
40. 40.🧭 A robot should turn right 45°, but its gyro shows it turned 56°. How many degrees must it turn back to the left?

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