Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 623 · 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’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
2. 2.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) turns left (b) goes straight back (c) stays still (d) goes straight forward
3. 3.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
4. 4.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 3 cm (c) 1 km (d) 340 cm
5. 5.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
6. 6.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
7. 7.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
8. 8.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 180° (c) 45° (d) 90°
9. 9.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they are round (c) they spin in the air (d) they spread the weight
10. 10.🛞 Which way of moving suits this best: “a flat road”? (a) propellers (b) wheels (c) legs (d) tracks
11. 11.⚙️ A motor makes 140 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
12. 12.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 20. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
13. 13.⚙️ A 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
14. 14.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
15. 15.🔍 Which sensor helps a robot feel a bump into a wall? (a) a camera (b) a temperature sensor (c) a touch sensor (d) a distance sensor
16. 16.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) tyre (c) driver gear (d) driven gear
17. 17.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.Which of these suits wheels? (a) deep mud (b) a smooth classroom floor (c) moving under water (d) a field of tall boulders
19. 19.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
20. 20.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
21. 21.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is hot (c) black is wet (d) black is loud
22. 22.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
23. 23.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 66. What is under the sensor? (a) the white floor (b) the black line
24. 24.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
25. 25.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
26. 26.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
27. 27.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
28. 28.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.🧭 How many degrees is a right-angle turn? (a) 45° (b) 90° (c) 360° (d) 180°
30. 30.🛞 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 backward. What does the robot do? (a) goes straight back (b) spins right on the spot (c) goes straight forward (d) spins left on the spot
31. 31.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
32. 32.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
33. 33.⚙️ A motor makes 40 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?
34. 34.⬛ A reading below the threshold means the sensor is over … (a) black (b) water (c) white (d) the sky
35. 35.Which job needs a distance sensor? (a) stop before a wall (b) warn if motors get hot (c) start on a hand clap (d) hear a whistle
36. 36.🦾 A servo program runs:
    angle = 90
    angle = angle + 30
    angle = angle − 60
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.🔍 Why do robots need sensors? (a) to look colourful (b) to be heavier (c) to know their world (d) to use more power
38. 38.📡 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)?
39. 39.True or false: to read a QR code, use a gyro sensor. (a) False (b) True
40. 40.🧭 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 30°, then right 30°, then left 135°. What does the gyro read now (0° to 359°)?

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