Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 152 · 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.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
2. 2.🧭 A robot spins 15° every second. How many seconds does it take to turn 15°?
3. 3.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) wheel size (d) number of gears
4. 4.Which job needs a light sensor? (a) stop before a wall (b) follow a black line (c) warn if motors get hot (d) read a QR code
5. 5.Which job needs a gyro sensor? (a) start on a hand clap (b) find the brightest spot (c) stay balanced upright (d) hear a whistle
6. 6.🧭 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 right 90°, then right 135°. What does the gyro read now (0° to 359°)?
7. 7.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
8. 8.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) goes straight forward (b) turns left (c) goes straight back (d) spins right on the spot
9. 9.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
10. 10.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
11. 11.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
12. 12.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
13. 13.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 15. What is under the sensor? (a) the white floor (b) the black line
14. 14.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
15. 15.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
16. 16.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
17. 17.🔍 Which sensor helps a robot stay balanced upright? (a) a distance sensor (b) a camera (c) a gyro sensor (d) a temperature sensor
18. 18.📡 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)?
19. 19.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a bat (c) a snail (d) a goldfish
20. 20.📡 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)?
21. 21.⚙️ A motor makes 500 turns a minute with a 20-tooth gear on it. That gear drives a 100-tooth gear. How many turns a minute does the 100-tooth gear make?
22. 22.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.⬛ A reading below the threshold means the sensor is over … (a) white (b) the sky (c) water (d) black
24. 24.🔍 Which sensor helps a robot feel a bump into a wall? (a) a camera (b) a touch sensor (c) a light sensor (d) a temperature sensor
25. 25.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
26. 26.Which of these suits propellers? (a) soft snow (b) crossing stepping-stones (c) a hospital corridor (d) flying over a field
27. 27.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a touch sensor (c) a sound sensor (d) a gyro sensor
28. 28.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
29. 29.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22/7 (c) 7/22 (d) 22
30. 30.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
31. 31.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
32. 32.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
33. 33.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
34. 34.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
35. 35.True or false: to measure how far a box is, use a distance sensor. (a) False (b) True
36. 36.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
37. 37.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
38. 38.🧭 A robot faces south. It does: turn right, turn right, turn right, turn around. Which way does it face now? (a) north (b) south (c) east (d) west
39. 39.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 60. What is under the sensor? (a) the black line (b) the white floor
40. 40.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) it goes there and back (c) the sensor is half (d) sound is slow

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