Robotics Worksheet: Robot If / Else

Robotics lesson 23: If / else with sensors · Set 275 · 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.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
   The distance is 39 cm and the light reading is 90. What does the robot do? (a) stop (b) turn left (c) go forward
2. 2.🤖 A robot is 67 cm from a wall. It runs:
   while (distance > 20) { forward 10 cm }
   stop
   How many times does it move forward?
3. 3.🤖 A robot is 109 cm from a wall. It runs:
   while (distance > 20) { forward 10 cm }
   stop
   How far from the wall does it stop (in cm)?
4. 4.🤖 In “if (distance < 20)”, what runs when the distance is exactly 20? (a) the if part (b) neither part (c) the else part (d) both parts
5. 5.🤖 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
6. 6.🤖 if (distance < 25) { turn right } else { go forward }
   The distance sensor reads 18 cm. What does the robot do? (a) turn right (b) go forward
7. 7.🤖 A robot is 46 cm from a wall. It runs:
   while (distance > 20) { forward 10 cm }
   stop
   How many times does it move forward?
8. 8.🤖 if (distance < 25) { turn right } else { go forward }
   The distance sensor reads 21 cm. What does the robot do? (a) turn right (b) go forward
9. 9.🤖 A robot is 41 cm from a wall. It runs:
   while (distance > 20) { forward 10 cm }
   stop
   How far from the wall does it stop (in cm)?
10. 10.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 12 cm and the light reading is 55. What does the robot do? (a) stop (b) go forward (c) turn left
11. 11.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 16 cm and the light reading is 20. What does the robot do? (a) go forward (b) stop (c) turn left
12. 12.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 10 cm and the light reading is 65. What does the robot do? (a) stop (b) turn left (c) go forward
13. 13.🤖 Obstacle avoiding: what should a robot do when something is close? (a) close its eyes (b) stop or turn away (c) push it hard (d) speed up
14. 14.🤖 if (distance < 20) { turn right } else { go forward }
    The distance sensor reads 31 cm. What does the robot do? (a) go forward (b) turn right
15. 15.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 20 cm and the light reading is 60. What does the robot do? (a) turn left (b) stop (c) go forward
16. 16.🤖 if (distance < 15) { turn right } else { go forward }
    The distance sensor reads 23 cm. What does the robot do? (a) turn right (b) go forward
17. 17.🤖 if (distance < 10) { turn right } else { go forward }
    The distance sensor reads 10 cm. What does the robot do? (a) turn right (b) go forward
18. 18.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 39 cm and the light reading is 20. What does the robot do? (a) go forward (b) stop (c) turn left
19. 19.🤖 What does an “if” let a robot do? (a) skip all sensors (b) charge itself (c) go faster always (d) choose using a sensor
20. 20.🤖 if (bumper is pressed) { back up and turn left } else { go forward }
    The bumper is pressed. What does the robot do? (a) back up and turn left (b) go forward
21. 21.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 12 cm and the light reading is 90. What does the robot do? (a) go forward (b) turn left (c) stop
22. 22.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 33 cm and the light reading is 10. What does the robot do? (a) go forward (b) turn left (c) stop
23. 23.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 36 cm and the light reading is 30. What does the robot do? (a) stop (b) go forward (c) turn left
24. 24.🤖 A robot is 86 cm from a wall. It runs:
    while (distance > 20) { forward 10 cm }
    stop
    How many times does it move forward?
25. 25.🤖 if (distance < 15) { turn right } else { go forward }
    The distance sensor reads 22 cm. What does the robot do? (a) go forward (b) turn right
26. 26.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 35 cm and the light reading is 35. What does the robot do? (a) turn left (b) go forward (c) stop
27. 27.🤖 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
28. 28.🤖 A robot is 31 cm from a wall. It runs:
    while (distance > 20) { forward 10 cm }
    stop
    How many times does it move forward?
29. 29.🤖 A robot is 49 cm from a wall. It runs:
    while (distance > 20) { forward 10 cm }
    stop
    How far from the wall does it stop (in cm)?
30. 30.🤖 if (bumper is pressed) { back up and turn left } else { go forward }
    The bumper is not pressed. What does the robot do? (a) back up and turn left (b) go forward
31. 31.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 33 cm and the light reading is 90. What does the robot do? (a) turn left (b) go forward (c) stop
32. 32.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 16 cm and the light reading is 45. What does the robot do? (a) turn left (b) go forward (c) stop
33. 33.🤖 if (distance < 15) { turn right } else { go forward }
    The distance sensor reads 24 cm. What does the robot do? (a) go forward (b) turn right
34. 34.🤖 if (bumper is pressed) { back up and turn right } else { go forward }
    The bumper is not pressed. What does the robot do? (a) go forward (b) back up and turn right
35. 35.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 36 cm and the light reading is 35. What does the robot do? (a) stop (b) go forward (c) turn left
36. 36.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 40 cm and the light reading is 80. What does the robot do? (a) go forward (b) turn left (c) stop
37. 37.🤖 if (distance < 10) { turn right } else { go forward }
    The distance sensor reads 4 cm. What does the robot do? (a) turn right (b) go forward
38. 38.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 7 cm and the light reading is 65. What does the robot do? (a) stop (b) go forward (c) turn left
39. 39.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 40 cm and the light reading is 30. What does the robot do? (a) stop (b) turn left (c) go forward
40. 40.🤖 A robot is 78 cm from a wall. It runs:
    while (distance > 20) { forward 10 cm }
    stop
    How far from the wall does it stop (in cm)?

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