Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 446 · 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 job needs a distance sensor? (a) measure a turn angle (b) measure how far a box is (c) feel a bump into a wall (d) read a QR code
2. 2.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) spokes (c) teeth (d) tyres
3. 3.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
4. 4.🧭 A robot spins 45° every second. How many seconds does it take to turn 45°?
5. 5.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
6. 6.Which job needs a temperature sensor? (a) find the brightest spot (b) read a QR code (c) warn if motors get hot (d) know a button is pressed
7. 7.🛞 Which way of moving suits this best: “a muddy building site”? (a) propellers (b) legs (c) wheels (d) tracks
8. 8.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
9. 9.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 34 cm (c) 1 km (d) 340 cm
10. 10.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they spread the weight (c) they are round (d) they are shiny
11. 11.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
12. 12.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) propellers (c) tracks (d) wheels
14. 14.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
15. 15.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 14 times. How many times does the driven gear turn?
16. 16.🔍 Why do robots need sensors? (a) to know their world (b) to look colourful (c) to be heavier (d) to use more power
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
18. 18.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 180° (c) 360° (d) 45°
19. 19.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
20. 20.Which job needs a sound sensor? (a) spot a red ball (b) feel a bump into a wall (c) read a QR code (d) start on a hand clap
21. 21.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
22. 22.True or false: “crossing stepping-stones” suits wheels. (a) True (b) False
23. 23.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
24. 24.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) to make it smaller (c) sound is slow (d) the sensor is half
25. 25.⚙️ 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?
26. 26.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
27. 27.🛞 Which way of moving suits this best: “soft snow”? (a) legs (b) propellers (c) wheels (d) tracks
28. 28.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
29. 29.True or false: “soft snow” suits tracks. (a) False (b) True
30. 30.🛞 Which way of moving suits this best: “flying over a field”? (a) wheels (b) legs (c) tracks (d) propellers
31. 31.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 30
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
33. 33.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
34. 34.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 20. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
36. 36.⚙️ A 15-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
37. 37.Which of these suits wheels? (a) hovering over a roof (b) flying over a field (c) crossing stepping-stones (d) a long factory floor
38. 38.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
39. 39.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
40. 40.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward

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