Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 481 · 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.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
2. 2.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
3. 3.Which of these suits legs? (a) deep mud (b) a field of tall boulders (c) a hospital corridor (d) a long factory floor
4. 4.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
5. 5.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
7. 7.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
8. 8.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a soft foam cushion (c) a metal door (d) a wooden box
9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
10. 10.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
11. 11.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
12. 12.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 20. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
14. 14.🧭 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 270°. It turns right 135°, then left 45°. What does the gyro read now (0° to 359°)?
15. 15.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
17. 17.True or false: to read a QR code, use a camera. (a) False (b) True
18. 18.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
19. 19.🧭 A robot faces north. It does: turn right, turn around, turn right. Which way does it face now? (a) east (b) south (c) west (d) north
20. 20.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) propellers (b) wheels (c) tracks (d) legs
21. 21.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
22. 22.True or false: to feel a bump into a wall, use a temperature sensor. (a) True (b) False
23. 23.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 57. What is under the sensor? (a) the white floor (b) the black line
24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
25. 25.🧭 A robot should turn right 90°, but its gyro shows it turned 89°. How many degrees must it turn more to the right?
26. 26.📡 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.🧭 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 45°, then left 60°, then right 135°. What does the gyro read now (0° to 359°)?
28. 28.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
29. 29.True or false: to stop before a wall, use a distance sensor. (a) False (b) True
30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
31. 31.Which job needs a temperature sensor? (a) measure how far a box is (b) start on a hand clap (c) warn if motors get hot (d) spot a red ball
32. 32.True or false: “a long factory floor” suits wheels. (a) True (b) False
33. 33.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 26. What is under the sensor? (a) the white floor (b) the black line
34. 34.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 360° (d) 90°
35. 35.📡 A robot is 290 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 7 seconds (in cm)?
36. 36.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 18. What is under the sensor? (a) the white floor (b) the black line
37. 37.🔍 Which sensor helps a robot know a button is pressed? (a) a distance sensor (b) a temperature sensor (c) a touch sensor (d) a light sensor
38. 38.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a dark tunnel (c) a white surface (d) a black line
39. 39.Which job needs a light sensor? (a) spot a red ball (b) find the brightest spot (c) stop before a wall (d) stay balanced upright
40. 40.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True

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