Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 37 · 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.📡 A robot is 130 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 5 seconds (in cm)?
2. 2.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
3. 3.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 2/7 (c) 22/7 (d) 7/22
4. 4.Which job needs a gyro sensor? (a) read a QR code (b) stay balanced upright (c) hear a whistle (d) stop before a wall
5. 5.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
6. 6.True or false: to feel a bump into a wall, use a touch sensor. (a) False (b) True
7. 7.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
9. 9.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
10. 10.True or false: to follow a black line, use a sound sensor. (a) False (b) True
11. 11.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
13. 13.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
14. 14.📡 A robot is 160 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 1 second (in cm)?
15. 15.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
16. 16.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) under the right sensor (c) far behind it (d) between the two sensors
17. 17.⚙️ A motor makes 240 turns a minute with a 10-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
18. 18.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 58. What is under the sensor? (a) the white floor (b) the black line
19. 19.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
20. 20.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
21. 21.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 40
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.⬛ The threshold of a light sensor is … (a) the battery size (b) the top speed (c) the wheel size (d) the black/white cut-off
25. 25.🛞 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 forward. What does the robot do? (a) spins right on the spot (b) stays still (c) turns right (d) goes straight forward
26. 26.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
27. 27.True or false: to know a button is pressed, use a camera. (a) False (b) True
28. 28.⚙️ A motor makes 40 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
29. 29.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 90. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
30. 30.Which of these suits wheels? (a) deep mud (b) loose sand dunes (c) a smooth classroom floor (d) a field of tall boulders
31. 31.🛞 Why do most indoor robots use wheels? (a) they float (b) fast and easy on floors (c) they look funny (d) they climb stairs
32. 32.📡 A robot is 170 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 9 seconds (in cm)?
33. 33.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 25. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
35. 35.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 60
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 38. What is under the sensor? (a) the black line (b) the white floor
37. 37.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) tracks (c) propellers (d) wheels
38. 38.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a soft foam cushion (d) a flat wall
39. 39.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
40. 40.Which job needs a sound sensor? (a) stop before a wall (b) know a button is pressed (c) start on a hand clap (d) read a QR code

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