Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 64 · 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.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
2. 2.Which job needs a camera? (a) spot a red ball (b) know a button is pressed (c) find the brightest spot (d) hear a whistle
3. 3.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 90° (d) 360°
4. 4.⚙️ A motor makes 280 turns a minute with a 10-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
5. 5.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times louder (c) 3 times faster (d) 3 times slower
6. 6.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
7. 7.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its circumference (d) its radius
8. 8.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 65. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
9. 9.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
10. 10.⚙️ A motor makes 120 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
11. 11.⚙️ A 10-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
12. 12.⚙️ 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
13. 13.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
14. 14.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
15. 15.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 55. What is under the sensor? (a) the black line (b) the white floor
16. 16.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
17. 17.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a soft foam cushion (d) a metal door
18. 18.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
19. 19.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
21. 21.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) hear claps (c) see colours (d) smell smoke
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 black line (b) the white floor
23. 23.🔍 What does a gyro sensor measure? (a) temperature (b) turning (rotation) (c) sound (d) colour
24. 24.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) wheel size (d) driver teeth
25. 25.Which of these suits legs? (a) moving under water (b) hovering over a roof (c) a long factory floor (d) a field of tall boulders
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.True or false: “soft snow” suits tracks. (a) True (b) False
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 60. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
29. 29.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
30. 30.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.🧭 A robot should turn right 45°, but its gyro shows it turned 57°. How many degrees must it turn back to the left?
32. 32.🧭 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 left 45°, then right 135°. What does the gyro read now (0° to 359°)?
33. 33.🔍 Which sensor helps a robot start on a hand clap? (a) a gyro sensor (b) a camera (c) a sound sensor (d) a touch sensor
34. 34.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
35. 35.🧭 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 180°. It turns left 135°, then right 180°, then right 60°. What does the gyro read now (0° to 359°)?
36. 36.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driver turns 50 times. How many times does the driven gear turn?
37. 37.⬛ The threshold of a light sensor is … (a) the top speed (b) the battery size (c) the black/white cut-off (d) the wheel size
38. 38.🦾 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 right (b) points straight up (c) points up and left (d) points up and right
39. 39.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
40. 40.Which job needs a distance sensor? (a) read a QR code (b) measure how far a box is (c) feel a bump into a wall (d) know a button is pressed

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