Robotics Worksheet: Robot If / Else

Robotics lesson 23: If / else with sensors · Set 456 · 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 105 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) { stop } else if (light < 30) { turn left } else { go forward }
   The distance is 23 cm and the light reading is 50. What does the robot do? (a) go forward (b) turn left (c) stop
3. 3.🤖 if (distance < 30) { turn right } else { go forward }
   The distance sensor reads 26 cm. What does the robot do? (a) go forward (b) turn right
4. 4.🤖 A robot is 36 cm from a wall. It runs:
   while (distance > 20) { forward 10 cm }
   stop
   How far from the wall does it stop (in cm)?
5. 5.🤖 In “if (distance < 20)”, what runs when the distance is exactly 20? (a) the if part (b) both parts (c) neither part (d) the else part
6. 6.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
   The distance is 13 cm and the light reading is 65. What does the robot do? (a) go forward (b) turn left (c) stop
7. 7.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
   The distance is 31 cm and the light reading is 60. What does the robot do? (a) go forward (b) stop (c) turn left
8. 8.🤖 if (bumper is pressed) { back up and turn left } else { go forward }
   The bumper is pressed. What does the robot do? (a) go forward (b) back up and turn left
9. 9.🤖 if (distance < 30) { turn right } else { go forward }
   The distance sensor reads 27 cm. What does the robot do? (a) turn right (b) go forward
10. 10.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 34 cm and the light reading is 50. What does the robot do? (a) turn left (b) go forward (c) stop
11. 11.🤖 A robot is 70 cm from a wall. It runs:
    while (distance > 20) { forward 10 cm }
    stop
    How many times does it move forward?
12. 12.🤖 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
13. 13.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 9 cm and the light reading is 25. What does the robot do? (a) turn left (b) stop (c) go forward
14. 14.🤖 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
15. 15.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 10 cm and the light reading is 25. What does the robot do? (a) stop (b) turn left (c) go forward
16. 16.🤖 Obstacle avoiding: what should a robot do when something is close? (a) push it hard (b) close its eyes (c) speed up (d) stop or turn away
17. 17.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 13 cm and the light reading is 35. What does the robot do? (a) go forward (b) stop (c) turn left
18. 18.🤖 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
19. 19.🤖 What does an “if” let a robot do? (a) go faster always (b) choose using a sensor (c) skip all sensors (d) charge itself
20. 20.🤖 A robot is 58 cm from a wall. It runs:
    while (distance > 20) { forward 10 cm }
    stop
    How many times does it move forward?
21. 21.🤖 if (distance < 25) { turn right } else { go forward }
    The distance sensor reads 24 cm. What does the robot do? (a) turn right (b) go forward
22. 22.🤖 if (distance < 25) { turn right } else { go forward }
    The distance sensor reads 31 cm. What does the robot do? (a) turn right (b) go forward
23. 23.🤖 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
24. 24.🤖 A robot is 41 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 9 cm. What does the robot do? (a) go forward (b) turn right
26. 26.🤖 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
27. 27.🤖 if (distance < 25) { turn right } else { go forward }
    The distance sensor reads 28 cm. What does the robot do? (a) turn right (b) go forward
28. 28.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 26 cm and the light reading is 20. What does the robot do? (a) stop (b) go forward (c) turn left
29. 29.🤖 if (distance < 20) { turn right } else { go forward }
    The distance sensor reads 26 cm. What does the robot do? (a) go forward (b) turn right
30. 30.🤖 if (distance < 10) { turn right } else { go forward }
    The distance sensor reads 6 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 15 cm and the light reading is 70. What does the robot do? (a) go forward (b) turn left (c) stop
32. 32.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 37 cm and the light reading is 20. What does the robot do? (a) go forward (b) stop (c) turn left
33. 33.🤖 if (distance < 10) { turn right } else { go forward }
    The distance sensor reads 18 cm. What does the robot do? (a) go forward (b) turn right
34. 34.🤖 if (distance < 25) { turn right } else { go forward }
    The distance sensor reads 19 cm. What does the robot do? (a) go forward (b) turn right
35. 35.🤖 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
36. 36.🤖 if (distance < 15) { turn right } else { go forward }
    The distance sensor reads 15 cm. What does the robot do? (a) go forward (b) turn right
37. 37.🤖 if (distance < 30) { turn right } else { go forward }
    The distance sensor reads 22 cm. What does the robot do? (a) turn right (b) go forward
38. 38.🤖 if (distance < 15) { turn right } else { go forward }
    The distance sensor reads 19 cm. What does the robot do? (a) turn right (b) go forward
39. 39.🤖 A robot is 102 cm from a wall. It runs:
    while (distance > 20) { forward 10 cm }
    stop
    How far from the wall does it stop (in cm)?
40. 40.🤖 if (distance < 15) { stop } else if (light < 30) { turn left } else { go forward }
    The distance is 17 cm and the light reading is 85. What does the robot do? (a) go forward (b) turn left (c) stop

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