Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 143 · 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 measure how far a box is? (a) a temperature sensor (b) a sound sensor (c) a touch sensor (d) a distance sensor
2. 2.True or false: to spot a red ball, use a camera. (a) False (b) True
3. 3.🧭 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 180°. It turns left 45°, then left 60°. What does the gyro read now (0° to 359°)?
4. 4.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its radius (d) its weight
5. 5.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
6. 6.🦾 A servo moves from 120° to 60°. How many degrees does it turn?
7. 7.🔍 Why do robots need sensors? (a) to use more power (b) to know their world (c) to be heavier (d) to look colourful
8. 8.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they spread the weight (c) they are shiny (d) they are round
9. 9.⚙️ An 8-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
10. 10.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
12. 12.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) under the right sensor (c) far behind it (d) between the two sensors
14. 14.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) wheels (c) propellers (d) legs
15. 15.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
16. 16.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) one up, one down (c) they do not turn (d) in opposite directions
17. 17.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
18. 18.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
19. 19.🧭 A robot should turn right 45°, but its gyro shows it turned 51°. How many degrees must it turn back to the left?
20. 20.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
21. 21.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
22. 22.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
23. 23.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
24. 24.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
25. 25.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 80. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
26. 26.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
27. 27.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
28. 28.🦾 A servo program runs:
    angle = 110
    angle = angle − 60
    angle = angle + 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ A 10-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
30. 30.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
31. 31.⬛ A reading below the threshold means the sensor is over … (a) black (b) the sky (c) water (d) white
32. 32.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
33. 33.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 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
35. 35.🔍 Which sensor helps a robot find the brightest spot? (a) a sound sensor (b) a gyro sensor (c) a light sensor (d) a touch sensor
36. 36.🧭 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 45°, then left 135°, then right 30°. What does the gyro read now (0° to 359°)?
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
38. 38.🛞 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) goes straight back (c) turns right (d) goes straight forward
39. 39.⚙️ A motor makes 480 turns a minute with an 8-tooth gear on it. That gear drives a 32-tooth gear. How many turns a minute does the 32-tooth gear make?
40. 40.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?

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