Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 575 · 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.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
2. 2.True or false: to warn if motors get hot, use a touch sensor. (a) True (b) False
3. 3.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
4. 4.🔍 Which sensor helps a robot know a button is pressed? (a) a sound sensor (b) a light sensor (c) a touch sensor (d) a camera
5. 5.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) water (c) black (d) white
6. 6.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
7. 7.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
8. 8.🛞 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) spins right on the spot (b) turns left (c) goes straight back (d) goes straight forward
9. 9.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 2 (c) 3 (d) 1
11. 11.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) driver teeth (d) number of gears
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
13. 13.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
14. 14.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
15. 15.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
16. 16.Which of these suits tracks? (a) crossing stepping-stones (b) moving under water (c) loose sand dunes (d) stepping over wide gaps
17. 17.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.Which job needs a distance sensor? (a) stop before a wall (b) hear a whistle (c) stay balanced upright (d) measure a turn angle
19. 19.🧭 A robot faces south. It does: turn left, turn around, turn around. Which way does it face now? (a) west (b) east (c) north (d) south
20. 20.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 46. What is under the sensor? (a) the black line (b) the white floor
21. 21.True or false: to measure how far a box is, use a distance sensor. (a) False (b) True
22. 22.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) zero (d) big (slow and strong)
23. 23.🔍 Which sensor helps a robot warn if motors get hot? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a touch sensor
24. 24.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
25. 25.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a sound sensor (c) a gyro sensor (d) a touch sensor
28. 28.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
29. 29.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
30. 30.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 53. What is under the sensor? (a) the black line (b) the white floor
32. 32.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points right (b) points up and left (c) points straight up (d) points left
33. 33.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) propellers (c) wheels (d) tracks
34. 34.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) one wheel runs faster (c) it uses a sail (d) it stops for ever
35. 35.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
36. 36.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
37. 37.True or false: to find the brightest spot, use a gyro sensor. (a) False (b) True
38. 38.🧭 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 right 45°, then right 60°. What does the gyro read now (0° to 359°)?
39. 39.Which job needs a sound sensor? (a) feel a bump into a wall (b) measure a turn angle (c) start on a hand clap (d) warn if motors get hot
40. 40.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) tracks (c) propellers (d) legs

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