Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 966 · 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 200 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.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) bright light (c) water drops (d) radio music
3. 3.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
4. 4.🔍 Which sensor helps a robot measure a turn angle? (a) a temperature sensor (b) a gyro sensor (c) a touch sensor (d) a sound sensor
5. 5.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
6. 6.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
7. 7.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) stays still (b) turns left (c) goes straight forward (d) goes straight back
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.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) driven gear (d) tyre
10. 10.🦾 A servo moves from 150° to 160°. How many degrees does it turn?
11. 11.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
12. 12.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
13. 13.True or false: to follow a black line, use a camera. (a) True (b) False
14. 14.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) legs (c) propellers (d) tracks
15. 15.🔍 What does a gyro sensor measure? (a) temperature (b) sound (c) turning (rotation) (d) colour
16. 16.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
17. 17.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
18. 18.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
19. 19.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
20. 20.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 1 (c) 2 (d) 4
21. 21.🛞 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) goes straight back (b) spins right on the spot (c) turns right (d) stays still
22. 22.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
24. 24.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
25. 25.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
26. 26.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
27. 27.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
29. 29.📡 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)?
30. 30.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
31. 31.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
32. 32.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and left (b) points straight up (c) points up and right (d) points right
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 90. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
34. 34.🦾 A servo program runs:
    angle = 110
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
35. 35.🛞 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) turns right (b) spins right on the spot (c) turns left (d) goes straight back
36. 36.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
37. 37.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
38. 38.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
39. 39.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
40. 40.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black soaks up light (c) black is hot (d) black is wet

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