Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 547 · 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 95 and the right sensor reads 30. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
2. 2.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.⚙️ 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
4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
5. 5.🔍 Which sensor helps a robot start on a hand clap? (a) a sound sensor (b) a touch sensor (c) a light sensor (d) a distance sensor
6. 6.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) turns right (b) spins right on the spot (c) turns left (d) spins left on the spot
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.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
9. 9.🧭 How many degrees is a full turn? (a) 90° (b) 360° (c) 100° (d) 180°
10. 10.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
11. 11.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) they do not turn (c) the same direction (d) one up, one down
12. 12.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 55. What is under the sensor? (a) the white floor (b) the black line
13. 13.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
14. 14.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
15. 15.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
16. 16.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
17. 17.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
18. 18.🛞 Which way of moving suits this best: “a flat road”? (a) wheels (b) tracks (c) legs (d) propellers
19. 19.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
20. 20.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
21. 21.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) slower (c) faster (d) backwards
22. 22.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
23. 23.Which of these suits wheels? (a) a long factory floor (b) loose sand dunes (c) a muddy building site (d) deep mud
24. 24.🔍 Why do robots need sensors? (a) to use more power (b) to know their world (c) to be heavier (d) to look colourful
25. 25.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
26. 26.Which of these suits legs? (a) moving under water (b) stepping over wide gaps (c) a hospital corridor (d) hovering over a roof
27. 27.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 30. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
29. 29.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
30. 30.True or false: to measure how far a box is, use a distance sensor. (a) False (b) True
31. 31.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
33. 33.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
34. 34.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is hot (c) black is loud (d) black soaks up light
35. 35.🦾 A servo program runs:
    angle = 100
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 198 cm?
37. 37.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) black (d) the sky
38. 38.🛞 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) turns left (b) goes straight back (c) turns right (d) goes straight forward
39. 39.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size
40. 40.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 71. What is under the sensor? (a) the black line (b) the white floor

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