Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 627 · 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 light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
2. 2.🧭 How many degrees is a full turn? (a) 100° (b) 90° (c) 360° (d) 180°
3. 3.🦾 A servo program runs:
   angle = 20
   angle = angle − 20
   angle = angle + 10
   angle = angle + 40
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
4. 4.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
5. 5.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 31. What is under the sensor? (a) the white floor (b) the black line
6. 6.🛞 Which way of moving suits this best: “hovering over a roof”? (a) propellers (b) legs (c) tracks (d) wheels
7. 7.🧭 A robot faces south. It does: turn left, turn left. Which way does it face now? (a) east (b) south (c) north (d) west
8. 8.📡 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
9. 9.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) legs (c) tracks (d) propellers
10. 10.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
11. 11.📡 A robot is 100 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 1 second (in cm)?
12. 12.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
14. 14.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
15. 15.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 82. What is under the sensor? (a) the white floor (b) the black line
16. 16.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.🛞 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) goes straight forward (b) spins right on the spot (c) goes straight back (d) spins left on the spot
19. 19.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
20. 20.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 45 times. How many times does the driven gear turn?
21. 21.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it jumps (c) it stops for ever (d) it uses a sail
22. 22.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
23. 23.🔍 Which sensor helps a robot hear a whistle? (a) a temperature sensor (b) a touch sensor (c) a sound sensor (d) a gyro sensor
24. 24.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
25. 25.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 75. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
26. 26.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) idler gear (c) tyre (d) driver gear
27. 27.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) number of gears (d) motor volts
28. 28.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) sound too high to hear (c) water drops (d) radio music
29. 29.⚙️ An 8-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
30. 30.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
31. 31.True or false: “a flat road” suits legs. (a) False (b) True
32. 32.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 65. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
34. 34.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 44. What is under the sensor? (a) the black line (b) the white floor
35. 35.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
37. 37.⚙️ 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
38. 38.🧭 A robot spins 15° every second. How many seconds does it take to turn 240°?
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 10. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
40. 40.📡 A robot is 130 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)?

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