Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 288 · 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 robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 90. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
2. 2.⚙️ A motor makes 210 turns a minute with a 20-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
3. 3.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) wheel size (d) number of gears
4. 4.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
5. 5.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
6. 6.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) water drops (c) sound too high to hear (d) radio music
7. 7.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
9. 9.🔦 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 black line (b) the white floor
10. 10.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo program runs:
    angle = 120
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 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 up and right (b) points up and left (c) points left (d) points straight up
14. 14.📡 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
15. 15.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
16. 16.🔍 Which sensor helps a robot read a QR code? (a) a sound sensor (b) a distance sensor (c) a camera (d) a touch sensor
17. 17.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
18. 18.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black soaks up light (d) black is hot
20. 20.⚙️ A 75-tooth driver gear turns a 15-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
21. 21.⚙️ 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
22. 22.True or false: “loose sand dunes” suits tracks. (a) False (b) True
23. 23.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
25. 25.📡 A robot is 180 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 27 seconds (in cm)?
26. 26.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True
27. 27.🛞 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)?
28. 28.🧭 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 right 30°, then left 45°, then right 45°. What does the gyro read now (0° to 359°)?
29. 29.🧭 How many degrees is a full turn? (a) 90° (b) 180° (c) 360° (d) 100°
30. 30.⬛ The threshold of a light sensor is … (a) the battery size (b) the top speed (c) the black/white cut-off (d) the wheel size
31. 31.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
32. 32.True or false: to stop before a wall, use a distance sensor. (a) True (b) False
33. 33.🔍 Why do robots need sensors? (a) to be heavier (b) to look colourful (c) to use more power (d) to know their world
34. 34.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its weight (c) its diameter (d) its circumference
35. 35.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
36. 36.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) faster and weaker (c) not at all (d) slower but stronger
38. 38.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 20. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
40. 40.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?

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