Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 680 · 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 slower”? (a) big drives small (b) small drives big
2. 2.🦾 A servo moves from 150° to 170°. How many degrees does it turn?
3. 3.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 100° (d) 90°
4. 4.🦾 A servo program runs:
   angle = 40
   angle = angle + 60
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
5. 5.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
6. 6.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) not at all (c) at the same speed (d) faster but weaker
7. 7.🧭 A robot should turn right 90°, but its gyro shows it turned 79°. How many degrees must it turn more to the right?
8. 8.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
9. 9.📡 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)?
10. 10.True or false: “a muddy building site” suits legs. (a) True (b) False
11. 11.🔍 Which sensor helps a robot feel a bump into a wall? (a) a camera (b) a touch sensor (c) a gyro sensor (d) a light sensor
12. 12.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
13. 13.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
14. 14.🧭 A robot spins 45° every second. How many seconds does it take to turn 270°?
15. 15.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) legs (b) wheels (c) tracks (d) propellers
16. 16.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) the sky (d) black
17. 17.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spin in the air (c) they are round (d) they spread the weight
18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
19. 19.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
20. 20.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 32. What is under the sensor? (a) the white floor (b) the black line
21. 21.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
22. 22.🧭 A robot spins 30° every second. How many seconds does it take to turn 30°?
23. 23.⚙️ 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
24. 24.Which job needs a temperature sensor? (a) stop before a wall (b) feel a bump into a wall (c) warn if motors get hot (d) hear a whistle
25. 25.True or false: to spot a red ball, use a camera. (a) True (b) False
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 30. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
27. 27.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
28. 28.True or false: “a hospital corridor” suits wheels. (a) False (b) True
29. 29.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
30. 30.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
31. 31.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 23. What is under the sensor? (a) the white floor (b) the black line
32. 32.Which of these suits wheels? (a) a hospital corridor (b) loose sand dunes (c) crossing stepping-stones (d) moving under water
33. 33.⚙️ A 15-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
34. 34.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
35. 35.🛞 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 backward. What does the robot do? (a) turns right (b) goes straight back (c) spins right on the spot (d) spins left on the spot
36. 36.True or false: to read a QR code, use a touch sensor. (a) False (b) True
37. 37.Which of these suits legs? (a) flying over a field (b) stepping over wide gaps (c) hovering over a roof (d) a flat road
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
39. 39.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
40. 40.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise

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