Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 383 · 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.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
2. 2.🔍 What does a gyro sensor measure? (a) colour (b) temperature (c) turning (rotation) (d) sound
3. 3.⬛ The threshold of a light sensor is … (a) the top speed (b) the battery size (c) the black/white cut-off (d) the wheel size
4. 4.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black surface (c) a white surface (d) a black line
6. 6.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) True (b) False
7. 7.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
8. 8.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a goldfish (c) a snail (d) a bat
9. 9.⚙️ A 15-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
10. 10.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
11. 11.Which of these suits wheels? (a) a flat road (b) stepping over wide gaps (c) flying over a field (d) a muddy building site
12. 12.🛞 Which way of moving suits this best: “deep mud”? (a) propellers (b) wheels (c) legs (d) tracks
13. 13.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.🧭 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 270°. It turns right 180°, then left 135°. What does the gyro read now (0° to 359°)?
15. 15.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
16. 16.🛞 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) goes straight forward (b) stays still (c) turns right (d) goes straight back
17. 17.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a metal door (d) a soft foam cushion
18. 18.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) harder to balance (c) they are too cheap (d) too fast on floors
19. 19.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
21. 21.🧭 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 left 120°, then right 180°. What does the gyro read now (0° to 359°)?
22. 22.🧭 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 270°. It turns right 30°, then right 135°, then left 120°. What does the gyro read now (0° to 359°)?
23. 23.🛞 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)?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
25. 25.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
26. 26.True or false: to stay balanced upright, use a touch sensor. (a) True (b) False
27. 27.True or false: “a hospital corridor” suits propellers. (a) False (b) True
28. 28.🧭 A robot faces north. It does: turn right, turn around. Which way does it face now? (a) east (b) south (c) north (d) west
29. 29.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
30. 30.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
31. 31.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 65. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
33. 33.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) at the same speed (c) not at all (d) slower but stronger
34. 34.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 25. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
36. 36.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 25. What is under the sensor? (a) the white floor (b) the black line
37. 37.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) tracks (b) wheels (c) propellers (d) legs
38. 38.📡 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?
39. 39.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
40. 40.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?

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