Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 753 · 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 has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 80. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
2. 2.Which job needs a light sensor? (a) feel a bump into a wall (b) read a QR code (c) start on a hand clap (d) follow a black line
3. 3.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
4. 4.Which of these suits propellers? (a) a smooth classroom floor (b) a long factory floor (c) crossing stepping-stones (d) hovering over a roof
5. 5.🛞 Which way of moving suits this best: “soft snow”? (a) tracks (b) propellers (c) wheels (d) legs
6. 6.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 16. What is under the sensor? (a) the black line (b) the white floor
7. 7.🧭 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 left 30°, then right 60°, then right 30°. What does the gyro read now (0° to 359°)?
8. 8.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
9. 9.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
10. 10.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
11. 11.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a soft foam cushion (c) a wooden box (d) a metal door
12. 12.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
13. 13.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) nowhere (c) faster (d) slower
14. 14.🔍 Which sensor helps a robot know a button is pressed? (a) a light sensor (b) a distance sensor (c) a touch sensor (d) a temperature sensor
15. 15.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 360° (d) 45°
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
17. 17.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
18. 18.🔍 Which sensor helps a robot hear a whistle? (a) a temperature sensor (b) a touch sensor (c) a camera (d) a sound sensor
19. 19.🧭 A robot faces north. It does: turn left, turn left. Which way does it face now? (a) north (b) west (c) south (d) east
20. 20.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) slower but stronger (c) not at all (d) faster but weaker
21. 21.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times bigger (c) 3 times faster (d) 3 times louder
22. 22.Which of these suits legs? (a) moving under water (b) stepping over wide gaps (c) soft snow (d) flying over a field
23. 23.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
24. 24.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a cow (c) a snail (d) a goldfish
25. 25.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
26. 26.🛞 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 back (b) goes straight forward (c) turns left (d) stays still
27. 27.📡 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)?
28. 28.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
29. 29.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
30. 30.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a light sensor (c) a touch sensor (d) a sound sensor
31. 31.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
32. 32.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a touch sensor (c) a camera (d) a gyro sensor
33. 33.True or false: “a long factory floor” suits tracks. (a) True (b) False
34. 34.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
35. 35.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
36. 36.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
37. 37.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
38. 38.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
39. 39.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) motor volts (d) number of gears
40. 40.🧭 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 90°. It turns left 45°, then right 45°. What does the gyro read now (0° to 359°)?

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