Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 163 · 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 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
2. 2.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
3. 3.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.📡 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) No (b) Yes
5. 5.🦾 A servo moves from 80° to 100°. How many degrees does it turn?
6. 6.🧭 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 right 180°, then left 60°. What does the gyro read now (0° to 359°)?
7. 7.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its radius (d) its weight
8. 8.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) tracks (c) propellers (d) legs
9. 9.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
11. 11.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
12. 12.📡 A robot is 300 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 58 seconds (in cm)?
13. 13.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a black surface (c) a dark tunnel (d) a white surface
14. 14.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 1 (c) 3 (d) 2
15. 15.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a servo (b) a caster wheel (c) a gear (d) a track
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
17. 17.⚙️ A 12-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
18. 18.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
19. 19.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
20. 20.📡 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)?
21. 21.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.🧭 A robot should turn right 90°, but its gyro shows it turned 81°. How many degrees must it turn more to the right?
23. 23.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
24. 24.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
26. 26.🔍 Which sensor helps a robot warn if motors get hot? (a) a light sensor (b) a gyro sensor (c) a distance sensor (d) a temperature sensor
27. 27.Which job needs a light sensor? (a) feel a bump into a wall (b) stay balanced upright (c) hear a whistle (d) follow a black line
28. 28.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and left (b) points up and right (c) points right (d) points left
30. 30.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 10. What is under the sensor? (a) the white floor (b) the black line
31. 31.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
32. 32.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they are too cheap (c) harder to balance (d) they never tire
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 90. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
34. 34.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) propellers (c) tracks (d) wheels
35. 35.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
36. 36.🔍 Which sensor helps a robot follow a black line? (a) a temperature sensor (b) a light sensor (c) a touch sensor (d) a sound sensor
37. 37.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
38. 38.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
39. 39.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
40. 40.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False

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