Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 588 · 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.🔍 Why do robots need sensors? (a) to know their world (b) to be heavier (c) to look colourful (d) to use more power
2. 2.🧭 What does a gyro help a robot do? (a) see colours (b) smell smoke (c) hear claps (d) turn by exact angles
3. 3.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 43. What is under the sensor? (a) the black line (b) the white floor
4. 4.⬛ A reading below the threshold means the sensor is over … (a) black (b) white (c) the sky (d) water
5. 5.🛞 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) stays still (b) spins right on the spot (c) goes straight back (d) goes straight forward
6. 6.🔍 What does a gyro sensor measure? (a) colour (b) turning (rotation) (c) sound (d) temperature
7. 7.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
8. 8.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
9. 9.🛞 Which way of moving suits this best: “a flat road”? (a) tracks (b) propellers (c) wheels (d) legs
10. 10.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 308 cm?
11. 11.Which job needs a distance sensor? (a) warn if motors get hot (b) stop before a wall (c) know a button is pressed (d) hear a whistle
12. 12.📡 A robot is 160 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 6 seconds (in cm)?
13. 13.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.True or false: to find the brightest spot, use a gyro sensor. (a) True (b) False
15. 15.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
16. 16.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
17. 17.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 26. What is under the sensor? (a) the white floor (b) the black line
18. 18.⚙️ A 15-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
19. 19.🦾 A servo program runs:
    angle = 60
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
21. 21.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a soft foam cushion (d) a metal door
22. 22.Which of these suits wheels? (a) loose sand dunes (b) crossing stepping-stones (c) a field of tall boulders (d) a flat road
23. 23.🧭 A robot faces south. It does: turn right, turn left, turn right. Which way does it face now? (a) south (b) north (c) east (d) west
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.⚙️ A motor makes 600 turns a minute with a 12-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
27. 27.🔍 Which sensor helps a robot read a QR code? (a) a touch sensor (b) a sound sensor (c) a distance sensor (d) a camera
28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
29. 29.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) zero (c) small (fast, weak) (d) big (slow and strong)
30. 30.🦾 A servo moves from 10° to 90°. How many degrees does it turn?
31. 31.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) harder to balance (c) they are too cheap (d) they never tire
32. 32.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
33. 33.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
35. 35.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.🔍 Which sensor helps a robot spot a red ball? (a) a light sensor (b) a touch sensor (c) a camera (d) a gyro sensor
37. 37.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
38. 38.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
39. 39.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.📡 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)?

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