Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 240 · 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.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) the sensor is half (c) sound is slow (d) to make it smaller
2. 2.🦾 A servo program runs:
   angle = 60
   angle = angle + 30
   angle = angle − 60
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
3. 3.🔍 Which sensor helps a robot read a QR code? (a) a camera (b) a distance sensor (c) a light sensor (d) a touch sensor
4. 4.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
5. 5.🔍 Which sensor helps a robot start on a hand clap? (a) a temperature sensor (b) a light sensor (c) a camera (d) a sound sensor
6. 6.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) faster and weaker (c) not at all (d) at the same speed
7. 7.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 1 (c) 2 (d) 4
8. 8.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 660 cm?
9. 9.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 44. What is under the sensor? (a) the black line (b) the white floor
10. 10.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
11. 11.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they are shiny (c) they spread the weight (d) they are round
12. 12.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
13. 13.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.Which job needs a touch sensor? (a) know a button is pressed (b) follow a black line (c) read a QR code (d) start on a hand clap
15. 15.🦾 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 right (b) points left (c) points straight up (d) points up and right
16. 16.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
17. 17.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.⬛ The threshold of a light sensor is … (a) the wheel size (b) the top speed (c) the battery size (d) the black/white cut-off
19. 19.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
20. 20.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.Which job needs a camera? (a) find the brightest spot (b) stop before a wall (c) spot a red ball (d) know a button is pressed
22. 22.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 15. What is under the sensor? (a) the white floor (b) the black line
23. 23.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 32. What is under the sensor? (a) the white floor (b) the black line
24. 24.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is loud (c) black soaks up light (d) black is hot
25. 25.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
26. 26.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
27. 27.Which job needs a temperature sensor? (a) measure how far a box is (b) hear a whistle (c) measure a turn angle (d) warn if motors get hot
28. 28.True or false: “a muddy building site” suits tracks. (a) False (b) True
29. 29.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
31. 31.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 180° (c) 360° (d) 90°
32. 32.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 100° (d) 360°
33. 33.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
35. 35.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) legs (c) tracks (d) propellers
36. 36.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
37. 37.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
38. 38.🔍 Which sensor helps a robot know a button is pressed? (a) a touch sensor (b) a gyro sensor (c) a distance sensor (d) a camera
39. 39.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.🧭 How many degrees is a right-angle turn? (a) 360° (b) 180° (c) 90° (d) 45°

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