Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 475 · 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.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a light sensor (c) a gyro sensor (d) a touch sensor
2. 2.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
3. 3.⬛ The threshold of a light sensor is … (a) the battery size (b) the top speed (c) the black/white cut-off (d) the wheel size
4. 4.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) tracks (c) propellers (d) wheels
5. 5.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 40. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
6. 6.🛞 Which way of moving suits this best: “a muddy building site”? (a) tracks (b) wheels (c) propellers (d) legs
7. 7.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
8. 8.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
9. 9.🛞 Which way of moving suits this best: “loose sand dunes”? (a) propellers (b) tracks (c) wheels (d) legs
10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
11. 11.Which job needs a distance sensor? (a) warn if motors get hot (b) stop before a wall (c) spot a red ball (d) follow a black line
12. 12.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
13. 13.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
14. 14.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a camera (c) a gyro sensor (d) a sound sensor
15. 15.Which job needs a temperature sensor? (a) spot a red ball (b) follow a black line (c) measure how far a box is (d) warn if motors get hot
16. 16.True or false: to hear a whistle, use a sound sensor. (a) True (b) False
17. 17.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 1 (c) 2 (d) 3
18. 18.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
19. 19.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
20. 20.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
21. 21.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) goes straight back (b) spins right on the spot (c) turns right (d) stays still
22. 22.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is hot (c) black is loud (d) black is wet
24. 24.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
26. 26.Which job needs a camera? (a) spot a red ball (b) start on a hand clap (c) measure how far a box is (d) find the brightest spot
27. 27.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
28. 28.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
29. 29.🧭 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 left 45°, then left 60°. What does the gyro read now (0° to 359°)?
30. 30.⚙️ A 15-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
31. 31.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 35. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
32. 32.Which job needs a touch sensor? (a) spot a red ball (b) start on a hand clap (c) feel a bump into a wall (d) hear a whistle
33. 33.Which of these suits legs? (a) a smooth classroom floor (b) crossing stepping-stones (c) moving under water (d) hovering over a roof
34. 34.⚙️ 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
35. 35.📡 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)?
36. 36.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
37. 37.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
38. 38.🦾 A servo program runs:
    angle = 130
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
40. 40.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°

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