Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 548 · 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 10 over black and 90 over white. A good threshold is halfway between them. What is it?
2. 2.⚙️ A motor makes 440 turns a minute with an 8-tooth gear on it. That gear drives a 32-tooth gear. How many turns a minute does the 32-tooth gear make?
3. 3.⬛ A reading below the threshold means the sensor is over … (a) water (b) white (c) black (d) the sky
4. 4.Which of these suits legs? (a) a hospital corridor (b) loose sand dunes (c) a flat road (d) crossing stepping-stones
5. 5.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
6. 6.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
7. 7.Which job needs a light sensor? (a) read a QR code (b) measure how far a box is (c) find the brightest spot (d) know a button is pressed
8. 8.🔍 Why do robots need sensors? (a) to be heavier (b) to look colourful (c) to know their world (d) to use more power
9. 9.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they float (c) fast and easy on floors (d) they climb stairs
10. 10.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
11. 11.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
12. 12.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) wheels (b) propellers (c) tracks (d) legs
13. 13.🔍 Which sensor helps a robot follow a black line? (a) a camera (b) a touch sensor (c) a light sensor (d) a distance sensor
14. 14.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
15. 15.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
17. 17.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
18. 18.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 35. What is under the sensor? (a) the black line (b) the white floor
19. 19.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they are round (c) they spin in the air (d) they spread the weight
20. 20.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
21. 21.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
22. 22.📡 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?
23. 23.🛞 Which way of moving suits this best: “flying over a field”? (a) wheels (b) legs (c) propellers (d) tracks
24. 24.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) slower but stronger (c) faster and weaker (d) at the same speed
25. 25.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) faster (c) backwards (d) slower
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
27. 27.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
29. 29.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 60. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
31. 31.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
32. 32.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
33. 33.🔍 Which sensor helps a robot read a QR code? (a) a light sensor (b) a distance sensor (c) a camera (d) a touch sensor
34. 34.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
36. 36.📡 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 2 seconds (in cm)?
37. 37.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
38. 38.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) propellers (c) wheels (d) tracks
39. 39.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 360° (d) 100°
40. 40.🧭 A robot spins 45° every second. How many seconds does it take to turn 225°?

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