Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 519 · 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 40 over black and 60 over white. A good threshold is halfway between them. What is it?
2. 2.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
3. 3.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they are round (c) they spin in the air (d) they spread the weight
4. 4.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 360° (c) 45° (d) 90°
6. 6.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
7. 7.Which job needs a gyro sensor? (a) hear a whistle (b) follow a black line (c) stay balanced upright (d) feel a bump into a wall
8. 8.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) faster but weaker (c) at the same speed (d) not at all
10. 10.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 180° (d) 45°
11. 11.🔍 Which sensor helps a robot hear a whistle? (a) a distance sensor (b) a sound sensor (c) a gyro sensor (d) a touch sensor
12. 12.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 34 cm (d) 3 cm
13. 13.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
14. 14.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
15. 15.⚙️ 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 big driver gear (b) a small driver gear
16. 16.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) spins left on the spot (b) turns right (c) stays still (d) turns left
17. 17.🔍 Why do robots need sensors? (a) to know their world (b) to use more power (c) to be heavier (d) to look colourful
18. 18.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
19. 19.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) number of gears (d) motor volts
20. 20.🛞 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) goes straight back (b) turns right (c) turns left (d) goes straight forward
21. 21.🛞 Which way of moving suits this best: “loose sand dunes”? (a) propellers (b) wheels (c) tracks (d) legs
22. 22.⚙️ 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
23. 23.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
24. 24.True or false: to feel a bump into a wall, use a sound sensor. (a) True (b) False
25. 25.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
26. 26.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
27. 27.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times bigger (c) 3 times slower (d) 3 times faster
29. 29.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
30. 30.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
31. 31.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
32. 32.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
33. 33.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
34. 34.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
35. 35.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
36. 36.🛞 Why do most indoor robots use wheels? (a) they float (b) they climb stairs (c) fast and easy on floors (d) they look funny
37. 37.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) a gear (c) an output (d) an input
38. 38.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.🔍 Which sensor helps a robot feel a bump into a wall? (a) a sound sensor (b) a touch sensor (c) a camera (d) a distance sensor
40. 40.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?

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