Robotics Worksheet: Robot If / Else

Robotics lesson 23: If / else with sensors · Set 481 · 40 questions

Robot tip (True → if, false → else): Put the reading into the condition: true → the if part, false → the else part. < means strictly less; an equal reading makes it false. else if: check the conditions from the top; the first true one wins. while: repeat until the condition is false.

1. 1.🤖 A robot is 81 cm from a wall. It runs:
   while (distance > 20) { forward 10 cm }
   stop
   How far from the wall does it stop (in cm)?
2. 2.🤖 if (distance < 15) { turn right } else { go forward }
   The distance sensor reads 14 cm. What does the robot do? (a) turn right (b) go forward
3. 3.🤖 Obstacle avoiding: what should a robot do when something is close? (a) push it hard (b) stop or turn away (c) close its eyes (d) speed up
4. 4.🤖 if (distance < 15) { turn right } else { go forward }
   The distance sensor reads 9 cm. What does the robot do? (a) go forward (b) turn right
5. 5.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
   The distance is 8 cm and the light reading is 20. What does the robot do? (a) turn left (b) go forward (c) stop
6. 6.🤖 A robot is 44 cm from a wall. It runs:
   while (distance > 20) { forward 10 cm }
   stop
   How far from the wall does it stop (in cm)?
7. 7.🤖 In “if (distance < 20)”, what runs when the distance is exactly 20? (a) the if part (b) both parts (c) the else part (d) neither part
8. 8.🤖 if (distance < 30) { turn right } else { go forward }
   The distance sensor reads 37 cm. What does the robot do? (a) turn right (b) go forward
9. 9.🤖 if (distance < 30) { turn right } else { go forward }
   The distance sensor reads 34 cm. What does the robot do? (a) turn right (b) go forward
10. 10.🤖 if (distance < 15) { turn right } else { go forward }
    The distance sensor reads 13 cm. What does the robot do? (a) go forward (b) turn right
11. 11.🤖 What does an “if” let a robot do? (a) skip all sensors (b) go faster always (c) charge itself (d) choose using a sensor
12. 12.🤖 if (bumper is pressed) { back up and turn right } else { go forward }
    The bumper is not pressed. What does the robot do? (a) back up and turn right (b) go forward
13. 13.🤖 if (distance < 10) { turn right } else { go forward }
    The distance sensor reads 13 cm. What does the robot do? (a) turn right (b) go forward
14. 14.🤖 if (distance < 30) { turn right } else { go forward }
    The distance sensor reads 21 cm. What does the robot do? (a) turn right (b) go forward
15. 15.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 40 cm and the light reading is 60. What does the robot do? (a) turn left (b) stop (c) go forward
16. 16.🤖 if (distance < 10) { turn right } else { go forward }
    The distance sensor reads 21 cm. What does the robot do? (a) turn right (b) go forward
17. 17.🤖 if (bumper is pressed) { back up and turn right } else { go forward }
    The bumper is pressed. What does the robot do? (a) back up and turn right (b) go forward
18. 18.🤖 if (distance < 15) { turn right } else { go forward }
    The distance sensor reads 21 cm. What does the robot do? (a) go forward (b) turn right
19. 19.🤖 if (distance < 25) { turn right } else { go forward }
    The distance sensor reads 35 cm. What does the robot do? (a) turn right (b) go forward
20. 20.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 5 cm and the light reading is 35. What does the robot do? (a) turn left (b) go forward (c) stop
21. 21.🤖 if (distance < 30) { turn right } else { go forward }
    The distance sensor reads 30 cm. What does the robot do? (a) go forward (b) turn right
22. 22.🤖 if (distance < 20) { turn right } else { go forward }
    The distance sensor reads 20 cm. What does the robot do? (a) turn right (b) go forward
23. 23.🤖 A robot is 37 cm from a wall. It runs:
    while (distance > 20) { forward 10 cm }
    stop
    How far from the wall does it stop (in cm)?
24. 24.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 29 cm and the light reading is 25. What does the robot do? (a) go forward (b) turn left (c) stop
25. 25.🤖 if (bumper is pressed) { back up and turn left } else { go forward }
    The bumper is not pressed. What does the robot do? (a) go forward (b) back up and turn left
26. 26.🤖 if (distance < 15) { turn right } else { go forward }
    The distance sensor reads 10 cm. What does the robot do? (a) go forward (b) turn right
27. 27.🤖 A robot is 98 cm from a wall. It runs:
    while (distance > 20) { forward 10 cm }
    stop
    How far from the wall does it stop (in cm)?
28. 28.🤖 if (distance < 10) { turn right } else { go forward }
    The distance sensor reads 10 cm. What does the robot do? (a) go forward (b) turn right
29. 29.🤖 if (distance < 10) { turn right } else { go forward }
    The distance sensor reads 11 cm. What does the robot do? (a) turn right (b) go forward
30. 30.🤖 if (distance < 20) { turn right } else { go forward }
    The distance sensor reads 31 cm. What does the robot do? (a) turn right (b) go forward
31. 31.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 17 cm and the light reading is 30. What does the robot do? (a) stop (b) turn left (c) go forward
32. 32.🤖 if (distance < 30) { turn right } else { go forward }
    The distance sensor reads 23 cm. What does the robot do? (a) turn right (b) go forward
33. 33.🤖 if (distance < 20) { turn right } else { go forward }
    The distance sensor reads 15 cm. What does the robot do? (a) turn right (b) go forward
34. 34.🤖 if (distance < 15) { turn right } else { go forward }
    The distance sensor reads 12 cm. What does the robot do? (a) go forward (b) turn right
35. 35.🤖 if (distance < 25) { turn right } else { go forward }
    The distance sensor reads 22 cm. What does the robot do? (a) turn right (b) go forward
36. 36.🤖 A robot is 50 cm from a wall. It runs:
    while (distance > 20) { forward 10 cm }
    stop
    How many times does it move forward?
37. 37.🤖 A robot is 84 cm from a wall. It runs:
    while (distance > 20) { forward 10 cm }
    stop
    How far from the wall does it stop (in cm)?
38. 38.🤖 A robot is 62 cm from a wall. It runs:
    while (distance > 20) { forward 10 cm }
    stop
    How far from the wall does it stop (in cm)?
39. 39.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 18 cm and the light reading is 30. What does the robot do? (a) turn left (b) stop (c) go forward
40. 40.🤖 if (distance < 10) { turn right } else { go forward }
    The distance sensor reads 4 cm. What does the robot do? (a) go forward (b) turn right

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