Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 814 · 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 wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
3. 3.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 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
4. 4.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
5. 5.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
6. 6.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its circumference (c) its radius (d) its diameter
7. 7.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
8. 8.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
9. 9.⚙️ An 8-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
10. 10.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) smell smoke (c) see colours (d) hear claps
11. 11.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a gyro sensor (c) a camera (d) a sound sensor
12. 12.🧭 A robot faces east. It does: turn around, turn left. Which way does it face now? (a) west (b) north (c) south (d) east
13. 13.🧭 A robot faces south. It does: turn right, turn right. Which way does it face now? (a) south (b) east (c) north (d) west
14. 14.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spread the weight (c) they spin in the air (d) they are round
15. 15.⬛ A reading below the threshold means the sensor is over … (a) water (b) the sky (c) white (d) black
16. 16.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
17. 17.🧭 A robot should turn right 90°, but its gyro shows it turned 83°. How many degrees must it turn more to the right?
18. 18.🧭 A robot spins 15° every second. How many seconds does it take to turn 270°?
19. 19.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 64. What is under the sensor? (a) the black line (b) the white floor
20. 20.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 1100 cm?
21. 21.🛞 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 backward. What does the robot do? (a) goes straight back (b) spins right on the spot (c) goes straight forward (d) spins left on the spot
22. 22.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.🔍 What does a gyro sensor measure? (a) turning (rotation) (b) temperature (c) sound (d) colour
24. 24.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 40. What is under the sensor? (a) the black line (b) the white floor
25. 25.🧭 A robot faces north. It does: turn right, turn around. Which way does it face now? (a) south (b) east (c) west (d) north
26. 26.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
28. 28.🦾 A servo moves from 50° to 60°. How many degrees does it turn?
29. 29.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 65. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors
30. 30.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
31. 31.🧭 A robot should turn right 45°, but its gyro shows it turned 37°. How many degrees must it turn more to the right?
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 40. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
33. 33.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
34. 34.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
35. 35.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 2 (c) 1 (d) 3
36. 36.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) water drops (c) radio music (d) sound too high to hear
38. 38.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.Which job needs a touch sensor? (a) follow a black line (b) feel a bump into a wall (c) measure a turn angle (d) warn if motors get hot
40. 40.Which job needs a distance sensor? (a) feel a bump into a wall (b) spot a red ball (c) stop before a wall (d) find the brightest spot

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