Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 902 · 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 distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.Which job needs a camera? (a) read a QR code (b) stop before a wall (c) measure how far a box is (d) warn if motors get hot
3. 3.📡 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)?
4. 4.True or false: “the output is weaker” happens when a small gear drives a big one. (a) False (b) True
5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
6. 6.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
7. 7.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
8. 8.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) propellers (b) legs (c) wheels (d) tracks
9. 9.🛞 Which way of moving suits this best: “a hospital corridor”? (a) propellers (b) wheels (c) tracks (d) legs
10. 10.🧭 A robot faces north. It does: turn right, turn left. Which way does it face now? (a) east (b) west (c) south (d) north
11. 11.📡 A robot is 140 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 14 seconds (in cm)?
12. 12.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
13. 13.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
14. 14.Which of these suits wheels? (a) soft snow (b) a hospital corridor (c) a muddy building site (d) stepping over wide gaps
15. 15.🦾 A servo moves from 50° to 20°. How many degrees does it turn?
16. 16.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
17. 17.Which job needs a temperature sensor? (a) warn if motors get hot (b) hear a whistle (c) stop before a wall (d) measure how far a box is
18. 18.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
19. 19.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.🧭 A robot spins 60° every second. How many seconds does it take to turn 300°?
21. 21.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
23. 23.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
24. 24.🛞 Circumference = π × … (a) speed (b) weight (c) diameter (d) radius only
25. 25.🧭 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 180°. It turns left 30°, then right 45°. What does the gyro read now (0° to 359°)?
26. 26.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) harder to balance (c) they never tire (d) they are too cheap
27. 27.🧭 What does a gyro help a robot do? (a) hear claps (b) turn by exact angles (c) smell smoke (d) see colours
28. 28.🧭 A robot should turn right 45°, but its gyro shows it turned 34°. How many degrees must it turn more to the right?
29. 29.🧭 A robot faces east. It does: turn around, turn right, turn right, turn right. Which way does it face now? (a) west (b) north (c) south (d) east
30. 30.🧭 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 0°. It turns left 60°, then left 180°, then right 135°. What does the gyro read now (0° to 359°)?
31. 31.📡 A robot is 290 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 8 seconds (in cm)?
32. 32.🧭 A robot spins 30° every second. How many seconds does it take to turn 240°?
33. 33.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
34. 34.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
35. 35.🧭 A robot should turn right 90°, but its gyro shows it turned 101°. How many degrees must it turn back to the left?
36. 36.🧭 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 left 120°, then right 120°. What does the gyro read now (0° to 359°)?
37. 37.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a gyro sensor (d) a touch sensor
38. 38.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
39. 39.Which job needs a gyro sensor? (a) measure a turn angle (b) start on a hand clap (c) hear a whistle (d) measure how far a box is
40. 40.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?

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