Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 626 · 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.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) wheel size (d) motor volts
2. 2.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
3. 3.Which job needs a touch sensor? (a) start on a hand clap (b) read a QR code (c) find the brightest spot (d) feel a bump into a wall
4. 4.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
5. 5.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
6. 6.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
7. 7.True or false: to warn if motors get hot, use a temperature sensor. (a) True (b) False
8. 8.Which of these suits propellers? (a) hovering over a roof (b) stepping over wide gaps (c) deep mud (d) crossing stepping-stones
9. 9.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points straight up (b) points left (c) points up and left (d) points right
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
11. 11.🧭 A robot should turn right 45°, but its gyro shows it turned 31°. How many degrees must it turn more to the right?
12. 12.🔍 What does a gyro sensor measure? (a) colour (b) temperature (c) sound (d) turning (rotation)
13. 13.⚙️ A 12-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
14. 14.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
15. 15.Which job needs a temperature sensor? (a) read a QR code (b) warn if motors get hot (c) feel a bump into a wall (d) follow a black line
16. 16.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
17. 17.🛞 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) turns right (b) spins left on the spot (c) goes straight forward (d) goes straight back
18. 18.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
19. 19.🧭 How many degrees is a right-angle turn? (a) 360° (b) 45° (c) 180° (d) 90°
20. 20.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 2 (c) 1 (d) 3
21. 21.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 30. What is under the sensor? (a) the black line (b) the white floor
22. 22.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
23. 23.🔍 Which sensor helps a robot start on a hand clap? (a) a distance sensor (b) a temperature sensor (c) a sound sensor (d) a camera
24. 24.True or false: “the output turns faster” happens when a small gear drives a big one. (a) False (b) True
25. 25.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
26. 26.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 2/7 (c) 7/22 (d) 22
27. 27.True or false: “soft snow” suits tracks. (a) True (b) False
28. 28.🦾 A servo program runs:
    angle = 50
    angle = angle + 50
    angle = angle + 40
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.🧭 A robot faces south. It does: turn right, turn right, turn around, turn left. Which way does it face now? (a) west (b) south (c) north (d) east
30. 30.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
31. 31.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
32. 32.⚙️ A 12-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
33. 33.🧭 How many degrees is a full turn? (a) 90° (b) 360° (c) 100° (d) 180°
34. 34.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
35. 35.⚙️ A motor makes 550 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
36. 36.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.⬛ The threshold of a light sensor is … (a) the top speed (b) the wheel size (c) the black/white cut-off (d) the battery size
39. 39.🛞 Which way of moving suits this best: “a flat road”? (a) propellers (b) wheels (c) legs (d) tracks
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?

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