Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 745 · 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.📡 A robot is 130 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 14 seconds (in cm)?
2. 2.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) propellers (b) legs (c) tracks (d) wheels
3. 3.📡 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)?
4. 4.🧭 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 120°, then right 120°, then right 60°. What does the gyro read now (0° to 359°)?
5. 5.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
7. 7.🧭 A robot spins 15° every second. How many seconds does it take to turn 150°?
8. 8.🔍 Which sensor helps a robot spot a red ball? (a) a touch sensor (b) a camera (c) a light sensor (d) a sound sensor
9. 9.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
10. 10.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
12. 12.🔍 What does a gyro sensor measure? (a) colour (b) temperature (c) turning (rotation) (d) sound
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 25. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
14. 14.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 30. What is under the sensor? (a) the white floor (b) the black line
15. 15.🔍 Which sensor helps a robot hear a whistle? (a) a light sensor (b) a touch sensor (c) a sound sensor (d) a distance sensor
16. 16.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.⚙️ A 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
18. 18.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a touch sensor (c) a camera (d) a sound sensor
19. 19.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
20. 20.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
21. 21.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
22. 22.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
23. 23.⬛ The threshold of a light sensor is … (a) the top speed (b) the battery size (c) the wheel size (d) the black/white cut-off
24. 24.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
25. 25.🧭 A robot should turn right 180°, but its gyro shows it turned 181°. How many degrees must it turn back to the left?
26. 26.🛞 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) goes straight back (b) turns left (c) goes straight forward (d) spins left on the spot
27. 27.🦾 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 left (b) points up and left (c) points right (d) points straight up
28. 28.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 33. What is under the sensor? (a) the white floor (b) the black line
29. 29.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
30. 30.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
31. 31.True or false: to measure how far a box is, use a sound sensor. (a) True (b) False
32. 32.True or false: “hovering over a roof” suits propellers. (a) False (b) True
33. 33.⚙️ A 12-tooth gear drives a 48-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
34. 34.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 70
    angle = angle − 60
    angle = angle + 50
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
38. 38.Which of these suits wheels? (a) deep mud (b) a field of tall boulders (c) a muddy building site (d) a flat road
39. 39.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) backwards (c) faster (d) nowhere
40. 40.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 85. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors

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