Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 693 · 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.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 90° (c) 360° (d) 180°
2. 2.🧭 A robot should turn right 45°, but its gyro shows it turned 51°. How many degrees must it turn back to the left?
3. 3.🧭 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 right 90°, then right 60°, then right 135°. What does the gyro read now (0° to 359°)?
4. 4.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
5. 5.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
6. 6.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 62. What is under the sensor? (a) the white floor (b) the black line
7. 7.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) backwards (c) slower (d) faster
9. 9.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points left (b) points straight up (c) points up and left (d) points right
10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
11. 11.🛞 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) stays still (b) goes straight forward (c) turns left (d) turns right
12. 12.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
13. 13.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 83. What is under the sensor? (a) the white floor (b) the black line
14. 14.📡 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)?
15. 15.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
16. 16.Which job needs a camera? (a) spot a red ball (b) start on a hand clap (c) hear a whistle (d) measure a turn angle
17. 17.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
18. 18.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
19. 19.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 75. What is under the sensor? (a) the black line (b) the white floor
20. 20.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
21. 21.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
22. 22.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) big (slow and strong) (d) never important
23. 23.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
24. 24.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
25. 25.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
26. 26.🧭 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 30°, then right 60°. What does the gyro read now (0° to 359°)?
27. 27.🔍 Which sensor helps a robot hear a whistle? (a) a gyro sensor (b) a temperature sensor (c) a sound sensor (d) a touch sensor
28. 28.🛞 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 backward. What does the robot do? (a) stays still (b) goes straight back (c) spins right on the spot (d) spins left on the spot
29. 29.🦾 A servo moves from 160° to 10°. How many degrees does it turn?
30. 30.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
31. 31.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 34. What is under the sensor? (a) the black line (b) the white floor
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 35. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
33. 33.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
34. 34.🔦 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 white floor (b) the black line
35. 35.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
36. 36.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) propellers (c) tracks (d) wheels
37. 37.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 65. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
39. 39.Which of these suits tracks? (a) flying over a field (b) a flat road (c) deep mud (d) moving under water
40. 40.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No

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