Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 453 · 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’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
3. 3.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
4. 4.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) wheels (c) tracks (d) propellers
5. 5.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 45. What is under the sensor? (a) the white floor (b) the black line
6. 6.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
7. 7.Which job needs a sound sensor? (a) find the brightest spot (b) start on a hand clap (c) stay balanced upright (d) read a QR code
8. 8.🛞 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?
9. 9.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.🦾 A servo program runs:
    angle = 100
    angle = angle + 30
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
12. 12.🛞 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 forward. What does the robot do? (a) spins left on the spot (b) turns right (c) goes straight forward (d) goes straight back
13. 13.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
14. 14.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) pins (c) tyres (d) teeth
15. 15.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a flat wall (d) a soft foam cushion
16. 16.True or false: “crossing stepping-stones” suits legs. (a) True (b) False
17. 17.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 65. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
20. 20.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
21. 21.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
22. 22.⚙️ A motor makes 240 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
23. 23.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 35. What is under the sensor? (a) the black line (b) the white floor
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
26. 26.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
27. 27.⚙️ A motor makes 200 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
28. 28.True or false: to follow a black line, use a sound sensor. (a) True (b) False
29. 29.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 20. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
31. 31.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
33. 33.Which job needs a camera? (a) feel a bump into a wall (b) measure a turn angle (c) read a QR code (d) start on a hand clap
34. 34.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
35. 35.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
36. 36.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor
37. 37.🛞 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 backward. What does the robot do? (a) goes straight back (b) turns left (c) spins right on the spot (d) goes straight forward
38. 38.True or false: “loose sand dunes” suits tracks. (a) True (b) False
39. 39.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.📡 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)?

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