Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 978 · 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.True or false: “loose sand dunes” suits tracks. (a) False (b) True
2. 2.🛞 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 forward. What does the robot do? (a) goes straight forward (b) spins left on the spot (c) stays still (d) spins right on the spot
3. 3.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
5. 5.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they are round (c) they spread the weight (d) they spin in the air
6. 6.🦾 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 up and left (b) points right (c) points straight up (d) points left
7. 7.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
8. 8.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
10. 10.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22/7 (c) 2/7 (d) 22
11. 11.🛞 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) turns right (b) spins right on the spot (c) spins left on the spot (d) turns left
12. 12.🦾 A servo program runs:
    angle = 130
    angle = angle − 50
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
13. 13.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) white (c) black (d) water
14. 14.⚙️ A motor makes 360 turns a minute with a 20-tooth gear on it. That gear drives an 80-tooth gear. How many turns a minute does the 80-tooth gear make?
15. 15.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
16. 16.🧭 A robot faces south. It does: turn left, turn left. Which way does it face now? (a) west (b) south (c) north (d) east
17. 17.🛞 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) turns left (c) goes straight forward (d) stays still
18. 18.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
19. 19.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
20. 20.📡 A robot is 230 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 7 seconds (in cm)?
21. 21.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) tyre (c) idler gear (d) driven gear
22. 22.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
24. 24.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
25. 25.🧭 A robot spins 15° every second. How many seconds does it take to turn 360°?
26. 26.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 60. What is under the sensor? (a) the white floor (b) the black line
27. 27.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it jumps (c) it stops for ever (d) one wheel runs faster
28. 28.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True
30. 30.Which of these suits wheels? (a) moving under water (b) crossing stepping-stones (c) stepping over wide gaps (d) a flat road
31. 31.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
32. 32.🧭 A robot should turn right 45°, but its gyro shows it turned 43°. How many degrees must it turn more to the right?
33. 33.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) tracks (b) propellers (c) legs (d) wheels
34. 34.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
35. 35.🔍 Which sensor helps a robot start on a hand clap? (a) a distance sensor (b) a sound sensor (c) a temperature sensor (d) a touch sensor
36. 36.🦾 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 right (d) points left
37. 37.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
38. 38.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
39. 39.Which job needs a camera? (a) measure how far a box is (b) read a QR code (c) stop before a wall (d) find the brightest spot
40. 40.📡 A robot is 230 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 7 seconds (in cm)?

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