Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 797 · 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 20-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
2. 2.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.🔍 Which sensor helps a robot feel a bump into a wall? (a) a touch sensor (b) a sound sensor (c) a camera (d) a temperature sensor
4. 4.Which job needs a distance sensor? (a) know a button is pressed (b) read a QR code (c) measure how far a box is (d) start on a hand clap
5. 5.🔍 Which sensor helps a robot find the brightest spot? (a) a light sensor (b) a touch sensor (c) a distance sensor (d) a temperature sensor
6. 6.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a touch sensor (d) a gyro sensor
7. 7.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
9. 9.True or false: “a flat road” suits wheels. (a) False (b) True
10. 10.True or false: to know a button is pressed, use a camera. (a) False (b) True
11. 11.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they never tire (c) they are too cheap (d) harder to balance
12. 12.True or false: “loose sand dunes” suits tracks. (a) True (b) False
13. 13.🛞 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) spins right on the spot (b) goes straight back (c) spins left on the spot (d) goes straight forward
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
15. 15.🔍 What does a gyro sensor measure? (a) temperature (b) sound (c) turning (rotation) (d) colour
16. 16.📡 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)?
17. 17.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
18. 18.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) wheel size (d) number of gears
19. 19.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
20. 20.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
21. 21.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
22. 22.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
23. 23.🛞 Circumference = π × … (a) weight (b) speed (c) radius only (d) diameter
24. 24.📡 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)?
25. 25.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
26. 26.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) driven gear (d) tyre
27. 27.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
28. 28.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 59. What is under the sensor? (a) the black line (b) the white floor
29. 29.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
30. 30.Which job needs a distance sensor? (a) know a button is pressed (b) follow a black line (c) hear a whistle (d) stop before a wall
31. 31.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
32. 32.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
33. 33.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 26. What is under the sensor? (a) the white floor (b) the black line
34. 34.📡 A robot is 270 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 16 seconds (in cm)?
35. 35.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black soaks up light (d) black is hot
36. 36.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) the sensor is half (c) it goes there and back (d) sound is slow
37. 37.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) hear claps (d) turn by exact angles
38. 38.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
39. 39.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
40. 40.⚙️ A 60-tooth driver gear turns a 12-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?

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