Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 931 · 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 motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
2. 2.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 65. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
4. 4.📡 A robot is 100 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 5 seconds (in cm)?
5. 5.Which job needs a distance sensor? (a) measure how far a box is (b) find the brightest spot (c) read a QR code (d) feel a bump into a wall
6. 6.🧭 A robot should turn right 90°, but its gyro shows it turned 78°. How many degrees must it turn more to the right?
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
8. 8.True or false: “hovering over a roof” suits propellers. (a) False (b) True
9. 9.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) wheel size (d) number of gears
10. 10.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
12. 12.🔍 Which sensor helps a robot feel a bump into a wall? (a) a temperature sensor (b) a touch sensor (c) a gyro sensor (d) a light sensor
13. 13.True or false: “a long factory floor” suits tracks. (a) True (b) False
14. 14.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 360° (c) 45° (d) 180°
15. 15.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
16. 16.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the right sensor (c) under the left sensor (d) far behind it
17. 17.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 12. What is under the sensor? (a) the white floor (b) the black line
19. 19.Which of these suits propellers? (a) flying over a field (b) a field of tall boulders (c) deep mud (d) crossing stepping-stones
20. 20.📡 A robot is 300 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 34 seconds (in cm)?
21. 21.🦾 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 straight up (b) points left (c) points up and right (d) points up and left
22. 22.⚙️ A motor makes 200 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?
23. 23.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
24. 24.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) goes straight forward (b) goes straight back (c) turns right (d) spins left on the spot
25. 25.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 35. What is under the sensor? (a) the white floor (b) the black line
26. 26.Which job needs a touch sensor? (a) follow a black line (b) start on a hand clap (c) warn if motors get hot (d) feel a bump into a wall
27. 27.🧭 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 right 60°, then left 120°. What does the gyro read now (0° to 359°)?
28. 28.🧭 A robot faces west. It does: turn around, turn right, turn left. Which way does it face now? (a) south (b) west (c) north (d) east
29. 29.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
30. 30.Which job needs a gyro sensor? (a) stay balanced upright (b) follow a black line (c) stop before a wall (d) feel a bump into a wall
31. 31.⚙️ A motor makes 200 turns a minute with a 15-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
32. 32.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a touch sensor (d) a gyro sensor
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 85. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
34. 34.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
35. 35.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
36. 36.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
37. 37.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
38. 38.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) they do not turn (c) in opposite directions (d) one up, one down
39. 39.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
40. 40.🧭 A robot faces north. It does: turn left, turn right, turn left, turn right. Which way does it face now? (a) east (b) south (c) north (d) west

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