Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 131 · 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 sensor helps a robot follow a black line? (a) a sound sensor (b) a temperature sensor (c) a light sensor (d) a gyro sensor
2. 2.⚙️ A 48-tooth driver gear turns a 12-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
3. 3.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
4. 4.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) the sensor is half (c) sound is slow (d) it goes there and back
5. 5.🔍 Which sensor helps a robot stay balanced upright? (a) a sound sensor (b) a gyro sensor (c) a distance sensor (d) a camera
6. 6.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) not at all (c) at the same speed (d) faster and weaker
7. 7.True or false: to warn if motors get hot, use a temperature sensor. (a) True (b) False
8. 8.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
10. 10.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) tyre (d) driven gear
11. 11.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) they do not turn (c) the same direction (d) one up, one down
12. 12.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
13. 13.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 0°. It turns right 60°, then right 120°. What does the gyro read now (0° to 359°)?
14. 14.Which job needs a sound sensor? (a) measure how far a box is (b) hear a whistle (c) read a QR code (d) stay balanced upright
15. 15.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
16. 16.Which of these suits wheels? (a) stepping over wide gaps (b) a flat road (c) loose sand dunes (d) deep mud
17. 17.⬛ 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
18. 18.📡 A robot is 290 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 27 seconds (in cm)?
19. 19.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
20. 20.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
21. 21.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points left (b) points right (c) points straight up (d) points up and right
22. 22.True or false: to feel a bump into a wall, use a touch sensor. (a) True (b) False
23. 23.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 52. What is under the sensor? (a) the black line (b) the white floor
24. 24.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) number of gears (d) wheel size
25. 25.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
26. 26.🧭 How many degrees is a full turn? (a) 90° (b) 100° (c) 360° (d) 180°
27. 27.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) the sky (d) black
28. 28.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
29. 29.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
30. 30.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
31. 31.⚙️ 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
32. 32.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
34. 34.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) tracks (c) wheels (d) propellers
35. 35.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
36. 36.🛞 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)?
37. 37.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
38. 38.📡 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?
39. 39.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 33. What is under the sensor? (a) the white floor (b) the black line
40. 40.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and right (b) points up and left (c) points left (d) points straight up

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