Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 63 · 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 way of moving suits this best: “a flat road”? (a) tracks (b) legs (c) wheels (d) propellers
2. 2.True or false: to read a QR code, use a camera. (a) False (b) True
3. 3.⚙️ A motor makes 300 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
4. 4.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) zero (d) big (slow and strong)
5. 5.Which job needs a light sensor? (a) start on a hand clap (b) follow a black line (c) know a button is pressed (d) stop before a wall
6. 6.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) propellers (c) tracks (d) wheels
7. 7.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a dark tunnel (c) a white surface (d) a black line
9. 9.🧭 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 270°. It turns right 45°, then left 30°. What does the gyro read now (0° to 359°)?
10. 10.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🧭 What does a gyro help a robot do? (a) see colours (b) hear claps (c) turn by exact angles (d) smell smoke
12. 12.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) faster (c) nowhere (d) slower
13. 13.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
14. 14.True or false: “a field of tall boulders” suits legs. (a) False (b) True
15. 15.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
16. 16.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 35. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
18. 18.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) slower but stronger (c) at the same speed (d) faster but weaker
19. 19.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 22. What is under the sensor? (a) the black line (b) the white floor
20. 20.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
21. 21.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
22. 22.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.🧭 A robot spins 15° every second. How many seconds does it take to turn 345°?
24. 24.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) legs (b) propellers (c) wheels (d) tracks
25. 25.🧭 A robot should turn right 90°, but its gyro shows it turned 77°. How many degrees must it turn more to the right?
26. 26.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) motor volts (d) wheel size
27. 27.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
29. 29.🛞 Which way of moving suits this best: “a long factory floor”? (a) tracks (b) propellers (c) legs (d) wheels
30. 30.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 55. What is under the sensor? (a) the black line (b) the white floor
31. 31.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
32. 32.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
33. 33.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle + 30
    angle = angle + 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.📡 A robot is 120 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 1 second (in cm)?
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 70. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
36. 36.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 220 cm?
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
38. 38.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
39. 39.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
40. 40.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False

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