Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 297 · 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 is 300 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 4 seconds (in cm)?
2. 2.Which of these suits propellers? (a) a hospital corridor (b) moving under water (c) soft snow (d) a field of tall boulders
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 35. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
4. 4.⚙️ The gear fixed to the motor is called the … (a) tyre (b) driven gear (c) idler gear (d) driver gear
5. 5.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
6. 6.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
7. 7.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
8. 8.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
9. 9.🔍 Which sensor helps a robot stay balanced upright? (a) a distance sensor (b) a temperature sensor (c) a sound sensor (d) a gyro sensor
10. 10.🔍 Which sensor helps a robot spot a red ball? (a) a distance sensor (b) a touch sensor (c) a camera (d) a light sensor
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
12. 12.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black is hot (d) black soaks up light
13. 13.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 20
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points straight up (b) points up and left (c) points up and right (d) points right
15. 15.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward 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) spins left on the spot
16. 16.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
17. 17.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
18. 18.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
19. 19.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) far behind it (d) under the right sensor
20. 20.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a sound sensor (c) a camera (d) a touch sensor
21. 21.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
22. 22.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 2 (c) 1 (d) 4
23. 23.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
24. 24.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
25. 25.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 70. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
26. 26.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) driver teeth (d) wheel size
27. 27.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
28. 28.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 32. What is under the sensor? (a) the white floor (b) the black line
29. 29.🔍 Which sensor helps a robot measure how far a box is? (a) a sound sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
30. 30.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points straight up (b) points up and right (c) points left (d) points right
31. 31.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
32. 32.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a gear (c) a wheel (d) an input
33. 33.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
34. 34.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
35. 35.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
36. 36.🦾 A servo moves from 140° to 110°. How many degrees does it turn?
37. 37.⬛ A reading below the threshold means the sensor is over … (a) white (b) black (c) water (d) the sky
38. 38.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 660 cm?
39. 39.🧭 A robot should turn right 90°, but its gyro shows it turned 104°. How many degrees must it turn back to the left?
40. 40.🦾 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 up and left (b) points right (c) points up and right (d) points straight up

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