Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 171 · 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.📡 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?
2. 2.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a distance sensor (c) a sound sensor (d) a touch sensor
3. 3.🦾 A servo program runs:
   angle = 10
   angle = angle + 60
   angle = angle + 20
   angle = angle + 40
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
4. 4.🛞 Which way of moving suits this best: “deep mud”? (a) tracks (b) propellers (c) wheels (d) legs
5. 5.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black soaks up light (c) black is hot (d) black is wet
6. 6.🔍 What does a gyro sensor measure? (a) sound (b) turning (rotation) (c) colour (d) temperature
7. 7.⚙️ The gear fixed to the motor is called the … (a) tyre (b) driver gear (c) idler gear (d) driven gear
8. 8.True or false: to warn if motors get hot, use a temperature sensor. (a) True (b) False
9. 9.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
10. 10.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an input (c) an output (d) a wheel
11. 11.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
12. 12.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
14. 14.🦾 A servo moves from 110° to 60°. How many degrees does it turn?
15. 15.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
17. 17.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
18. 18.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) in opposite directions (c) the same direction (d) one up, one down
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 80. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
20. 20.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
21. 21.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
22. 22.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
23. 23.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) wheel size (d) number of gears
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
26. 26.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) stays still (b) goes straight forward (c) turns left (d) spins right on the spot
27. 27.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.Which job needs a distance sensor? (a) read a QR code (b) know a button is pressed (c) stop before a wall (d) warn if motors get hot
29. 29.Which of these suits wheels? (a) a field of tall boulders (b) deep mud (c) a smooth classroom floor (d) stepping over wide gaps
30. 30.🛞 Which way of moving suits this best: “a long factory floor”? (a) propellers (b) tracks (c) legs (d) wheels
31. 31.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
32. 32.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 660 cm?
33. 33.🔍 Why do robots need sensors? (a) to look colourful (b) to use more power (c) to know their world (d) to be heavier
34. 34.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
35. 35.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
36. 36.Which of these suits wheels? (a) hovering over a roof (b) flying over a field (c) stepping over wide gaps (d) a long factory floor
37. 37.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
38. 38.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
39. 39.🧭 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 0°. It turns left 90°, then left 90°, then right 30°. What does the gyro read now (0° to 359°)?
40. 40.True or false: “moving under water” suits tracks. (a) False (b) True

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