Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 721 · 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 light sensor reads below 30 over a black line and above 30 over the white floor. It reads 43. What is under the sensor? (a) the white floor (b) the black line
2. 2.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
3. 3.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
4. 4.True or false: to start on a hand clap, use a light sensor. (a) True (b) False
5. 5.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times slower (c) 3 times faster (d) 3 times bigger
6. 6.⚙️ 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
7. 7.🔍 Which sensor helps a robot stay balanced upright? (a) a light sensor (b) a temperature sensor (c) a camera (d) a gyro sensor
8. 8.🛞 Which way of moving suits this best: “soft snow”? (a) propellers (b) wheels (c) legs (d) tracks
9. 9.🧭 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 left 90°, then left 120°. What does the gyro read now (0° to 359°)?
10. 10.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 360° (d) 180°
12. 12.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
14. 14.🔍 Which sensor helps a robot spot a red ball? (a) a touch sensor (b) a distance sensor (c) a sound sensor (d) a camera
15. 15.🛞 Which way of moving suits this best: “moving under water”? (a) tracks (b) propellers (c) wheels (d) legs
16. 16.⚙️ A motor makes 320 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?
17. 17.Which job needs a light sensor? (a) stay balanced upright (b) stop before a wall (c) find the brightest spot (d) start on a hand clap
18. 18.🔍 What does a gyro sensor measure? (a) colour (b) temperature (c) turning (rotation) (d) sound
19. 19.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
20. 20.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
21. 21.🧭 A robot spins 45° every second. How many seconds does it take to turn 45°?
22. 22.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
23. 23.📡 A robot is 120 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 5 seconds (in cm)?
24. 24.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
25. 25.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 220 cm?
26. 26.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
27. 27.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
28. 28.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a camera (c) a sound sensor (d) a gyro sensor
29. 29.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 95. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
30. 30.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
31. 31.True or false: “the output turns faster” happens when a small gear drives a big one. (a) False (b) True
32. 32.⚙️ 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
33. 33.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 26. What is under the sensor? (a) the white floor (b) the black line
34. 34.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
35. 35.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) water drops (c) radio music (d) bright light
36. 36.🦾 A servo program runs:
    angle = 60
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
37. 37.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 45° (d) 180°
38. 38.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
39. 39.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
40. 40.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a servo (c) a gear (d) a track

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