Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 99 · 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.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black is hot (d) black soaks up light
2. 2.Which of these suits propellers? (a) stepping over wide gaps (b) hovering over a roof (c) crossing stepping-stones (d) deep mud
3. 3.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they spread the weight (c) they are shiny (d) they are round
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
5. 5.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) nowhere (c) slower (d) faster
6. 6.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
7. 7.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 37. What is under the sensor? (a) the white floor (b) the black line
8. 8.🧭 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 270°. It turns left 120°, then right 120°. What does the gyro read now (0° to 359°)?
9. 9.True or false: to measure a turn angle, use a distance sensor. (a) True (b) False
10. 10.🔍 Which sensor helps a robot stay balanced upright? (a) a sound sensor (b) a light sensor (c) a touch sensor (d) a gyro sensor
11. 11.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
12. 12.True or false: “the output is weaker” happens when a small gear drives a big one. (a) False (b) True
13. 13.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 29. What is under the sensor? (a) the white floor (b) the black line
14. 14.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
15. 15.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
16. 16.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
18. 18.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
19. 19.📡 A robot is 120 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 22 seconds (in cm)?
20. 20.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
21. 21.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
22. 22.🧭 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 30°, then left 60°, then left 30°. What does the gyro read now (0° to 359°)?
23. 23.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
24. 24.🛞 Which way of moving suits this best: “soft snow”? (a) tracks (b) wheels (c) legs (d) propellers
25. 25.🔍 Which sensor helps a robot measure a turn angle? (a) a light sensor (b) a camera (c) a gyro sensor (d) a sound sensor
26. 26.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) water drops (c) sound too high to hear (d) bright light
27. 27.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a soft foam cushion (c) a wooden box (d) a flat wall
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 15. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
29. 29.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
30. 30.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) faster but weaker (c) at the same speed (d) slower but stronger
31. 31.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True
32. 32.Which of these suits propellers? (a) crossing stepping-stones (b) a long factory floor (c) a hospital corridor (d) moving under water
33. 33.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 59. What is under the sensor? (a) the black line (b) the white floor
34. 34.Which job needs a gyro sensor? (a) stay balanced upright (b) follow a black line (c) start on a hand clap (d) know a button is pressed
35. 35.🛞 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) goes straight back (b) turns right (c) stays still (d) spins right on the spot
36. 36.⚙️ A 45-tooth driver gear turns a 15-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
37. 37.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
38. 38.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) under the left sensor (c) far behind it (d) between the two sensors
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 65. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
40. 40.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?

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