Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 394 · 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.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
2. 2.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
3. 3.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) motor volts (d) number of gears
4. 4.⚙️ A motor makes 40 turns a minute with a 15-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
5. 5.📡 A robot is 280 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 9 seconds (in cm)?
6. 6.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
7. 7.Which of these suits wheels? (a) a flat road (b) loose sand dunes (c) soft snow (d) deep mud
8. 8.🧭 A robot faces west. It does: turn left, turn left, turn around. Which way does it face now? (a) north (b) east (c) west (d) south
9. 9.Which job needs a light sensor? (a) know a button is pressed (b) follow a black line (c) spot a red ball (d) hear a whistle
10. 10.🔍 What does a gyro sensor measure? (a) turning (rotation) (b) temperature (c) sound (d) colour
11. 11.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 25. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
12. 12.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.True or false: “crossing stepping-stones” suits legs. (a) False (b) True
14. 14.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
16. 16.True or false: to start on a hand clap, use a sound sensor. (a) False (b) True
17. 17.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
18. 18.🔍 Which sensor helps a robot measure how far a box is? (a) a gyro sensor (b) a touch sensor (c) a light sensor (d) a distance sensor
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 70. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
20. 20.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a camera (c) a touch sensor (d) a sound sensor
21. 21.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
22. 22.True or false: to follow a black line, use a light sensor. (a) False (b) True
23. 23.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
25. 25.🔍 Which sensor helps a robot start on a hand clap? (a) a distance sensor (b) a temperature sensor (c) a sound sensor (d) a touch sensor
26. 26.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.📡 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)?
28. 28.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
29. 29.🔍 Which sensor helps a robot read a QR code? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a camera
30. 30.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
31. 31.📡 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)?
32. 32.Which job needs a light sensor? (a) know a button is pressed (b) start on a hand clap (c) hear a whistle (d) find the brightest spot
33. 33.🔦 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 white floor (b) the black line
34. 34.Which of these suits legs? (a) soft snow (b) deep mud (c) stepping over wide gaps (d) a long factory floor
35. 35.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
36. 36.⚙️ A 60-tooth driver gear turns a 15-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
37. 37.🦾 A servo program runs:
    angle = 70
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.🧭 A robot spins 30° every second. How many seconds does it take to turn 90°?
39. 39.🛞 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) spins left on the spot (b) goes straight back (c) stays still (d) turns left
40. 40.Which of these suits legs? (a) a smooth classroom floor (b) crossing stepping-stones (c) hovering over a roof (d) a long factory floor

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