Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 744 · 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 below 60 over a black line and above 60 over the white floor. It reads 69. What is under the sensor? (a) the black line (b) the white floor
2. 2.🛞 Circumference = π × … (a) radius only (b) speed (c) weight (d) diameter
3. 3.Which of these suits tracks? (a) flying over a field (b) hovering over a roof (c) a smooth classroom floor (d) a muddy building site
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
5. 5.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a gyro sensor (c) a touch sensor (d) a camera
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
8. 8.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
9. 9.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
10. 10.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
11. 11.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 74. What is under the sensor? (a) the white floor (b) the black line
12. 12.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is loud (c) black is hot (d) black is wet
13. 13.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) number of gears (d) wheel size
14. 14.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
15. 15.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
16. 16.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 100° (d) 360°
17. 17.Which job needs a gyro sensor? (a) read a QR code (b) measure a turn angle (c) measure how far a box is (d) feel a bump into a wall
18. 18.Which job needs a sound sensor? (a) find the brightest spot (b) hear a whistle (c) measure how far a box is (d) measure a turn angle
19. 19.🦾 A servo moves from 30° to 180°. How many degrees does it turn?
20. 20.📡 A robot is 220 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 25 seconds (in cm)?
21. 21.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 1100 cm?
22. 22.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) turn by exact angles (d) hear claps
23. 23.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
24. 24.True or false: to find the brightest spot, use a light sensor. (a) True (b) False
25. 25.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.🧭 How many degrees is a right-angle turn? (a) 90° (b) 180° (c) 45° (d) 360°
27. 27.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
28. 28.🔍 Which sensor helps a robot stop before a wall? (a) a light sensor (b) a gyro sensor (c) a touch sensor (d) a distance sensor
29. 29.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
30. 30.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 31. What is under the sensor? (a) the black line (b) the white floor
32. 32.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
33. 33.⚙️ 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
34. 34.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) nowhere (c) slower (d) backwards
35. 35.⚙️ A motor makes 320 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?
36. 36.True or false: “the output is weaker” happens when a small gear drives a big one. (a) False (b) True
37. 37.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
38. 38.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) wheels (b) legs (c) propellers (d) tracks
39. 39.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
40. 40.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise

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