Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 465 · 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.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
2. 2.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
3. 3.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
4. 4.🧭 A robot should turn right 45°, but its gyro shows it turned 44°. How many degrees must it turn more to the right?
5. 5.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
6. 6.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 90° (c) 180° (d) 45°
7. 7.Which job needs a touch sensor? (a) measure how far a box is (b) feel a bump into a wall (c) read a QR code (d) start on a hand clap
8. 8.True or false: “a flat road” suits tracks. (a) False (b) True
9. 9.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 26. What is under the sensor? (a) the white floor (b) the black line
10. 10.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
11. 11.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
12. 12.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
13. 13.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
14. 14.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times bigger (c) 3 times faster (d) 3 times slower
15. 15.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) in opposite directions (c) they do not turn (d) the same direction
16. 16.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) under the right sensor (d) far behind it
17. 17.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 30. What is under the sensor? (a) the white floor (b) the black line
18. 18.🛞 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?
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 90. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
20. 20.⚙️ 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
21. 21.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
22. 22.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
23. 23.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) fast and easy on floors (d) they float
24. 24.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo moves from 0° to 110°. How many degrees does it turn?
26. 26.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
27. 27.Which job needs a temperature sensor? (a) stay balanced upright (b) warn if motors get hot (c) feel a bump into a wall (d) hear a whistle
28. 28.🧭 A robot faces west. It does: turn right, turn around, turn right. Which way does it face now? (a) north (b) east (c) south (d) west
29. 29.Which job needs a camera? (a) warn if motors get hot (b) read a QR code (c) find the brightest spot (d) feel a bump into a wall
30. 30.⚙️ A motor makes 50 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
31. 31.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
32. 32.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
33. 33.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.📡 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) motor volts (d) number of gears
36. 36.⚙️ A motor makes 360 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
37. 37.Which job needs a touch sensor? (a) know a button is pressed (b) measure a turn angle (c) start on a hand clap (d) follow a black line
38. 38.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 46. What is under the sensor? (a) the black line (b) the white floor
39. 39.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
40. 40.Which job needs a light sensor? (a) measure how far a box is (b) spot a red ball (c) know a button is pressed (d) find the brightest spot

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