Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 846 · 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 wet (b) black soaks up light (c) black is loud (d) black is hot
2. 2.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
3. 3.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 58. What is under the sensor? (a) the black line (b) the white floor
4. 4.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) motor volts (d) driver teeth
7. 7.True or false: “the output turns faster” happens when a small gear drives a big one. (a) False (b) True
8. 8.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it jumps (c) it uses a sail (d) one wheel runs faster
9. 9.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
10. 10.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times bigger (c) 3 times louder (d) 3 times slower
11. 11.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) at the same speed (c) faster but weaker (d) not at all
12. 12.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
13. 13.🧭 A robot spins 15° every second. How many seconds does it take to turn 90°?
14. 14.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.🦾 A servo moves from 90° to 10°. How many degrees does it turn?
16. 16.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
17. 17.Which job needs a touch sensor? (a) stay balanced upright (b) warn if motors get hot (c) stop before a wall (d) feel a bump into a wall
18. 18.True or false: to hear a whistle, use a distance sensor. (a) False (b) True
19. 19.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
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 3 times (in cm)? =
21. 21.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a light sensor (c) a camera (d) a touch sensor
22. 22.🔍 Which sensor helps a robot stop before a wall? (a) a camera (b) a distance sensor (c) a gyro sensor (d) a light sensor
23. 23.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
24. 24.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 3 (c) 2 (d) 4
25. 25.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
26. 26.🧭 A robot faces south. It does: turn around, turn right. Which way does it face now? (a) west (b) south (c) east (d) north
27. 27.True or false: “moving under water” suits propellers. (a) True (b) False
28. 28.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 60. What is under the sensor? (a) the white floor (b) the black line
29. 29.🛞 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 left (b) spins left on the spot (c) turns right (d) stays still
30. 30.🔍 Which sensor helps a robot measure how far a box is? (a) a gyro sensor (b) a temperature sensor (c) a light sensor (d) a distance sensor
31. 31.Which job needs a sound sensor? (a) warn if motors get hot (b) stop before a wall (c) feel a bump into a wall (d) start on a hand clap
32. 32.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
33. 33.Which of these suits propellers? (a) soft snow (b) loose sand dunes (c) deep mud (d) hovering over a roof
34. 34.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
35. 35.🧭 A robot should turn right 45°, but its gyro shows it turned 46°. How many degrees must it turn back to the left?
36. 36.Which job needs a light sensor? (a) read a QR code (b) follow a black line (c) know a button is pressed (d) measure a turn angle
37. 37.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
38. 38.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
39. 39.🧭 A robot faces east. It does: turn right, turn right. Which way does it face now? (a) south (b) east (c) west (d) north
40. 40.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor

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