Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 230 · 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: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
2. 2.🛞 Which way of moving suits this best: “a muddy building site”? (a) tracks (b) legs (c) wheels (d) propellers
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
4. 4.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 37. What is under the sensor? (a) the white floor (b) the black line
5. 5.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
6. 6.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
7. 7.⬛ A reading below the threshold means the sensor is over … (a) black (b) the sky (c) water (d) white
8. 8.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) under the right sensor (d) far behind it
9. 9.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
10. 10.True or false: “stepping over wide gaps” suits tracks. (a) False (b) True
11. 11.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its weight (d) its circumference
12. 12.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 40. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
13. 13.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 10. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
15. 15.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
16. 16.Which of these suits wheels? (a) soft snow (b) a hospital corridor (c) stepping over wide gaps (d) hovering over a roof
17. 17.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
18. 18.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
19. 19.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
20. 20.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) too fast on floors (c) they are too cheap (d) they never tire
21. 21.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 176 cm?
22. 22.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
23. 23.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 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
24. 24.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
25. 25.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
27. 27.⚙️ A 20-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
28. 28.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
29. 29.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
30. 30.⬛ The threshold of a light sensor is … (a) the wheel size (b) the top speed (c) the black/white cut-off (d) the battery size
31. 31.🧭 A robot should turn right 180°, but its gyro shows it turned 183°. How many degrees must it turn back to the left?
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 85. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
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 90°. It turns right 30°, then left 135°. What does the gyro read now (0° to 359°)?
34. 34.🧭 A robot faces west. It does: turn left, turn left. Which way does it face now? (a) south (b) north (c) east (d) west
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 65. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
36. 36.🧭 A robot faces north. It does: turn right, turn around. Which way does it face now? (a) north (b) east (c) south (d) west
37. 37.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
39. 39.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.🔍 Which sensor helps a robot measure a turn angle? (a) a gyro sensor (b) a light sensor (c) a sound sensor (d) a touch sensor

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