Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 591 · 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 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
2. 2.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
3. 3.Which job needs a camera? (a) stay balanced upright (b) find the brightest spot (c) read a QR code (d) hear a whistle
4. 4.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
6. 6.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a white surface (c) a dark tunnel (d) a black surface
7. 7.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and left (b) points left (c) points right (d) points straight up
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
9. 9.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
10. 10.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) idler gear (c) driver gear (d) tyre
11. 11.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
13. 13.True or false: “a long factory floor” suits propellers. (a) True (b) False
14. 14.⬛ A reading below the threshold means the sensor is over … (a) water (b) black (c) the sky (d) white
15. 15.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) propellers (b) legs (c) tracks (d) wheels
16. 16.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) one wheel runs faster (c) it jumps (d) it uses a sail
17. 17.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
18. 18.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) tracks (c) propellers (d) wheels
19. 19.📡 A robot is 180 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 3 seconds (in cm)?
20. 20.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
21. 21.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) driver teeth (d) motor volts
22. 22.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) turns left (b) spins left on the spot (c) spins right on the spot (d) goes straight forward
23. 23.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
24. 24.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) slower but stronger (c) at the same speed (d) faster and weaker
25. 25.⬛ 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
26. 26.🧭 A robot should turn right 90°, but its gyro shows it turned 75°. How many degrees must it turn more to the right?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 10. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
29. 29.🧭 A robot spins 90° every second. How many seconds does it take to turn 180°?
30. 30.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.⚙️ A motor makes 120 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
32. 32.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) far behind it (c) under the left sensor (d) under the right sensor
33. 33.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 220 cm?
34. 34.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
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 runs forward. What does the robot do? (a) stays still (b) spins right on the spot (c) turns left (d) turns right
36. 36.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) tracks (b) propellers (c) wheels (d) legs
37. 37.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
38. 38.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) propellers (b) tracks (c) wheels (d) legs
39. 39.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) the same direction (d) they do not turn
40. 40.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?

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