Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 599 · 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.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
2. 2.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 25. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
4. 4.📡 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) No (b) Yes
5. 5.True or false: “a long factory floor” suits tracks. (a) True (b) False
6. 6.🧭 A robot spins 30° every second. How many seconds does it take to turn 300°?
7. 7.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
8. 8.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
9. 9.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
10. 10.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
12. 12.🔍 Which sensor helps a robot start on a hand clap? (a) a sound sensor (b) a camera (c) a temperature sensor (d) a touch sensor
13. 13.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
14. 14.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) nowhere (c) slower (d) backwards
15. 15.🔍 What does a gyro sensor measure? (a) turning (rotation) (b) sound (c) temperature (d) colour
16. 16.True or false: “a smooth classroom floor” suits legs. (a) True (b) False
17. 17.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times slower (c) 3 times louder (d) 3 times bigger
18. 18.🔍 Which sensor helps a robot follow a black line? (a) a temperature sensor (b) a gyro sensor (c) a light sensor (d) a camera
19. 19.🔍 Which sensor helps a robot feel a bump into a wall? (a) a touch sensor (b) a camera (c) a temperature sensor (d) a gyro sensor
20. 20.🧭 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 90°. It turns right 135°, then left 45°. What does the gyro read now (0° to 359°)?
21. 21.True or false: “a flat road” suits wheels. (a) False (b) True
22. 22.🦾 A servo program runs:
    angle = 120
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
23. 23.Which job needs a sound sensor? (a) warn if motors get hot (b) stop before a wall (c) find the brightest spot (d) hear a whistle
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 70. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
25. 25.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
26. 26.🧭 A robot faces east. It does: turn right, turn left. Which way does it face now? (a) south (b) east (c) north (d) west
27. 27.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
28. 28.🔍 Which sensor helps a robot spot a red ball? (a) a gyro sensor (b) a touch sensor (c) a temperature sensor (d) a camera
29. 29.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an output (c) an input (d) a gear
30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
31. 31.📡 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)?
32. 32.🛞 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) stays still (b) spins right on the spot (c) spins left on the spot (d) goes straight forward
33. 33.True or false: “a long factory floor” suits wheels. (a) True (b) False
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
37. 37.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 75. What is under the sensor? (a) the white floor (b) the black line
38. 38.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) wheel size (d) number of gears
39. 39.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
40. 40.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?

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