Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 180 · 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 reading below the threshold means the sensor is over … (a) the sky (b) black (c) white (d) water
2. 2.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 70. What is under the sensor? (a) the black line (b) the white floor
3. 3.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) hear claps (c) smell smoke (d) see colours
5. 5.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
6. 6.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
7. 7.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 71. What is under the sensor? (a) the black line (b) the white floor
8. 8.🧭 A robot faces north. It does: turn left, turn around. Which way does it face now? (a) east (b) north (c) south (d) west
9. 9.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it jumps (c) it uses a sail (d) it stops for ever
10. 10.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 50 times. How many times does the driven gear turn?
11. 11.🔍 Which sensor helps a robot find the brightest spot? (a) a camera (b) a sound sensor (c) a light sensor (d) a gyro sensor
12. 12.🔍 Which sensor helps a robot stop before a wall? (a) a distance sensor (b) a gyro sensor (c) a touch sensor (d) a sound sensor
13. 13.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a temperature sensor (c) a distance sensor (d) a touch sensor
14. 14.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
15. 15.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 75. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
16. 16.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a touch sensor (c) a camera (d) a sound sensor
17. 17.Which of these suits propellers? (a) a field of tall boulders (b) a flat road (c) a hospital corridor (d) flying over a field
18. 18.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
19. 19.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
20. 20.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
21. 21.Which job needs a light sensor? (a) hear a whistle (b) spot a red ball (c) follow a black line (d) start on a hand clap
22. 22.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
23. 23.🔍 Which sensor helps a robot hear a whistle? (a) a light sensor (b) a gyro sensor (c) a temperature sensor (d) a sound sensor
24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
25. 25.⬛ The threshold of a light sensor is … (a) the battery size (b) the top speed (c) the wheel size (d) the black/white cut-off
26. 26.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
28. 28.🧭 A robot should turn right 45°, but its gyro shows it turned 47°. How many degrees must it turn back to the left?
29. 29.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
30. 30.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
31. 31.⚙️ A 75-tooth driver gear turns a 15-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
33. 33.🧭 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 180°. It turns right 45°, then right 45°, then right 135°. What does the gyro read now (0° to 359°)?
34. 34.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) not at all (c) slower but stronger (d) faster but weaker
35. 35.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
36. 36.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) an output (c) a wheel (d) a gear
37. 37.True or false: “a long factory floor” suits wheels. (a) True (b) False
38. 38.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they spin in the air (c) they are round (d) they are shiny
39. 39.Which of these suits wheels? (a) flying over a field (b) soft snow (c) a smooth classroom floor (d) deep mud
40. 40.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 880 cm?

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