Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 524 · 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.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
2. 2.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) goes straight forward (b) stays still (c) turns right (d) goes straight back
3. 3.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
4. 4.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
5. 5.🧭 A robot spins 45° every second. How many seconds does it take to turn 135°?
6. 6.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
7. 7.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
8. 8.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
10. 10.🛞 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) turns right (b) goes straight forward (c) goes straight back (d) stays still
11. 11.True or false: to measure a turn angle, use a light sensor. (a) True (b) False
12. 12.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
13. 13.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) to make it smaller (c) the sensor is half (d) sound is slow
14. 14.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points straight up (b) points up and left (c) points right (d) points left
15. 15.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 40. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
17. 17.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 60. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
19. 19.🛞 Which way of moving suits this best: “deep mud”? (a) wheels (b) propellers (c) legs (d) tracks
20. 20.⚙️ A 36-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
21. 21.⚙️ A motor makes 180 turns a minute with a 12-tooth gear on it. That gear drives a 36-tooth gear. How many turns a minute does the 36-tooth gear make?
22. 22.🧭 A robot should turn right 45°, but its gyro shows it turned 37°. How many degrees must it turn more to the right?
23. 23.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
24. 24.🧭 How many degrees is a right-angle turn? (a) 45° (b) 180° (c) 360° (d) 90°
25. 25.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 35. What is under the sensor? (a) the black line (b) the white floor
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.🦾 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 up and right (c) points straight up (d) points right
28. 28.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 44. What is under the sensor? (a) the white floor (b) the black line
29. 29.True or false: “hovering over a roof” suits legs. (a) False (b) True
30. 30.🔍 Which sensor helps a robot warn if motors get hot? (a) a sound sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
31. 31.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 10. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
32. 32.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
33. 33.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
34. 34.Which of these suits wheels? (a) hovering over a roof (b) deep mud (c) a muddy building site (d) a flat road
35. 35.Which job needs a gyro sensor? (a) stay balanced upright (b) know a button is pressed (c) hear a whistle (d) feel a bump into a wall
36. 36.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
37. 37.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
38. 38.⚙️ 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 big driver gear (b) a small driver gear
39. 39.🧭 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 30°. What does the gyro read now (0° to 359°)?
40. 40.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) spins right on the spot (b) goes straight forward (c) goes straight back (d) stays still

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