Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 461 · 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 warn if motors get hot? (a) a touch sensor (b) a light sensor (c) a temperature sensor (d) a gyro sensor
2. 2.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
4. 4.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
5. 5.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
6. 6.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
7. 7.🔍 What does a gyro sensor measure? (a) temperature (b) turning (rotation) (c) sound (d) colour
8. 8.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a caster wheel (c) a track (d) a servo
10. 10.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
11. 11.🦾 A servo program runs:
    angle = 110
    angle = angle − 30
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
12. 12.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) True (b) False
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
14. 14.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
15. 15.True or false: to read a QR code, use a camera. (a) False (b) True
16. 16.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
17. 17.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
18. 18.🛞 Which way of moving suits this best: “a hospital corridor”? (a) tracks (b) propellers (c) legs (d) wheels
19. 19.True or false: to spot a red ball, use a distance sensor. (a) True (b) False
20. 20.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 110 cm?
21. 21.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
22. 22.True or false: to follow a black line, use a touch sensor. (a) False (b) True
23. 23.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 198 cm?
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 60. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
25. 25.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
26. 26.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) they are too cheap (c) too fast on floors (d) harder to balance
27. 27.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) tyres (c) spokes (d) teeth
28. 28.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) see colours (d) turn by exact angles
32. 32.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) goes straight forward (b) spins right on the spot (c) turns left (d) turns right
33. 33.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) fast and easy on floors (d) they float
34. 34.📡 A robot is 100 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 7 seconds (in cm)?
35. 35.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
36. 36.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.🧭 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 180°, then right 90°, then right 120°. What does the gyro read now (0° to 359°)?
38. 38.Which of these suits wheels? (a) loose sand dunes (b) a flat road (c) a field of tall boulders (d) hovering over a roof
39. 39.📡 A robot is 230 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 5 seconds (in cm)?
40. 40.⚙️ A 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?

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