Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 863 · 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.⬛ The threshold of a light sensor is … (a) the wheel size (b) the battery size (c) the top speed (d) the black/white cut-off
2. 2.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
3. 3.Which job needs a sound sensor? (a) warn if motors get hot (b) spot a red ball (c) feel a bump into a wall (d) hear a whistle
4. 4.True or false: to read a QR code, use a sound sensor. (a) True (b) False
5. 5.🛞 Which way of moving suits this best: “a long factory floor”? (a) propellers (b) wheels (c) legs (d) tracks
6. 6.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
7. 7.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
8. 8.🧭 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 30°, then left 45°. What does the gyro read now (0° to 359°)?
9. 9.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) legs (b) wheels (c) tracks (d) propellers
10. 10.True or false: to hear a whistle, use a touch sensor. (a) True (b) False
11. 11.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
12. 12.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
13. 13.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) wheels (b) tracks (c) propellers (d) legs
14. 14.⚙️ A motor makes 160 turns a minute with an 8-tooth gear on it. That gear drives a 32-tooth gear. How many turns a minute does the 32-tooth gear make?
15. 15.Which job needs a light sensor? (a) follow a black line (b) read a QR code (c) measure a turn angle (d) spot a red ball
16. 16.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
17. 17.🧭 A robot spins 60° every second. How many seconds does it take to turn 300°?
18. 18.Which job needs a temperature sensor? (a) warn if motors get hot (b) measure how far a box is (c) stop before a wall (d) stay balanced upright
19. 19.🧭 A robot spins 30° every second. How many seconds does it take to turn 330°?
20. 20.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
21. 21.⚙️ A 16-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
22. 22.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
23. 23.True or false: “the output turns faster” happens when a big gear drives a small one. (a) True (b) False
24. 24.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) number of gears (d) wheel size
25. 25.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) wheels (c) propellers (d) legs
26. 26.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 66. What is under the sensor? (a) the black line (b) the white floor
27. 27.🧭 A robot spins 60° every second. How many seconds does it take to turn 180°?
28. 28.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.🧭 A robot spins 30° every second. How many seconds does it take to turn 30°?
31. 31.🧭 A robot spins 15° every second. How many seconds does it take to turn 240°?
32. 32.Which of these suits wheels? (a) hovering over a roof (b) a field of tall boulders (c) a smooth classroom floor (d) loose sand dunes
33. 33.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
34. 34.🔍 What does a gyro sensor measure? (a) sound (b) turning (rotation) (c) colour (d) temperature
35. 35.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
36. 36.Which of these suits legs? (a) moving under water (b) hovering over a roof (c) a field of tall boulders (d) a smooth classroom floor
37. 37.🔍 Which sensor helps a robot stay balanced upright? (a) a camera (b) a sound sensor (c) a gyro sensor (d) a light sensor
38. 38.True or false: “a long factory floor” suits propellers. (a) True (b) False
39. 39.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its circumference (d) its radius
40. 40.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?

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