Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 22 · 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 robot should turn right 90°, but its gyro shows it turned 84°. How many degrees must it turn more to the right?
2. 2.Which job needs a distance sensor? (a) stop before a wall (b) stay balanced upright (c) know a button is pressed (d) start on a hand clap
3. 3.📡 A robot is 130 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 10 seconds (in cm)?
4. 4.True or false: to read a QR code, use a camera. (a) False (b) True
5. 5.True or false: to find the brightest spot, use a light sensor. (a) False (b) True
6. 6.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times bigger (d) 3 times slower
7. 7.🦾 A servo moves from 0° to 170°. How many degrees does it turn?
8. 8.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 15. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
9. 9.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
10. 10.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
11. 11.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.🧭 A robot spins 60° every second. How many seconds does it take to turn 300°?
13. 13.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.🧭 A robot faces east. It does: turn around, turn around. Which way does it face now? (a) east (b) south (c) west (d) north
16. 16.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) far behind it (c) under the right sensor (d) between the two sensors
17. 17.🔍 Which sensor helps a robot follow a black line? (a) a distance sensor (b) a camera (c) a light sensor (d) a temperature sensor
18. 18.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) they do not turn (c) in opposite directions (d) one up, one down
20. 20.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ A 30-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
22. 22.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 21. What is under the sensor? (a) the black line (b) the white floor
23. 23.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
24. 24.Which of these suits wheels? (a) soft snow (b) crossing stepping-stones (c) a flat road (d) stepping over wide gaps
25. 25.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are shiny (c) they are round (d) they spin in the air
26. 26.🧭 A robot should turn right 180°, but its gyro shows it turned 173°. How many degrees must it turn more to the right?
27. 27.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
28. 28.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
29. 29.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) spins left on the spot (b) stays still (c) goes straight forward (d) turns left
30. 30.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
31. 31.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
32. 32.True or false: to spot a red ball, use a touch sensor. (a) True (b) False
33. 33.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) True (b) False
35. 35.🔍 Which sensor helps a robot measure a turn angle? (a) a gyro sensor (b) a touch sensor (c) a sound sensor (d) a distance sensor
36. 36.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
37. 37.⬛ The threshold of a light sensor is … (a) the top speed (b) the wheel size (c) the battery size (d) the black/white cut-off
38. 38.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an input (c) a wheel (d) an output
39. 39.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a gear (c) a caster wheel (d) a servo
40. 40.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?

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