Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 79 · 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 spins faster with more V? (a) a servo motor (b) a DC motor
2. 2.Which job needs a sound sensor? (a) warn if motors get hot (b) feel a bump into a wall (c) start on a hand clap (d) read a QR code
3. 3.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
4. 4.📡 A robot is 170 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 15 seconds (in cm)?
5. 5.🧭 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 left 45°, then left 45°, then left 30°. What does the gyro read now (0° to 359°)?
6. 6.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 100° (d) 360°
7. 7.🛞 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) stays still (b) turns right (c) turns left (d) spins left on the spot
8. 8.🧭 A robot should turn right 45°, but its gyro shows it turned 58°. How many degrees must it turn back to the left?
9. 9.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
10. 10.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
11. 11.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
12. 12.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) turns right (b) goes straight forward (c) stays still (d) spins left on the spot
13. 13.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
14. 14.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 1100 cm?
15. 15.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
16. 16.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
17. 17.True or false: “hovering over a roof” suits propellers. (a) False (b) True
18. 18.📡 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)?
19. 19.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
20. 20.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
21. 21.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
22. 22.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 65. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
24. 24.⚙️ A motor makes 250 turns a minute with a 12-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
25. 25.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) tracks (c) propellers (d) legs
26. 26.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
27. 27.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 60. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
28. 28.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they float (c) fast and easy on floors (d) they climb stairs
29. 29.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
30. 30.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
31. 31.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True
32. 32.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
33. 33.🛞 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)?
34. 34.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.Which of these suits tracks? (a) a smooth classroom floor (b) a field of tall boulders (c) soft snow (d) a long factory floor
36. 36.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a wheel (c) a gear (d) an input
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
38. 38.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
39. 39.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
40. 40.🔍 Which sensor helps a robot spot a red ball? (a) a sound sensor (b) a temperature sensor (c) a distance sensor (d) a camera

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