Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 554 · 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.True or false: “flying over a field” suits legs. (a) False (b) True
2. 2.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
3. 3.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the right sensor (c) under the left sensor (d) between the two sensors
4. 4.🧭 A robot should turn right 180°, but its gyro shows it turned 181°. How many degrees must it turn back to the left?
5. 5.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) driver teeth (d) motor volts
6. 6.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
7. 7.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 17. What is under the sensor? (a) the white floor (b) the black line
8. 8.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
9. 9.🔍 Which sensor helps a robot measure how far a box is? (a) a sound sensor (b) a gyro sensor (c) a touch sensor (d) a distance sensor
10. 10.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times slower (c) 3 times louder (d) 3 times faster
11. 11.🛞 Which way of moving suits this best: “flying over a field”? (a) tracks (b) legs (c) propellers (d) wheels
12. 12.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 3 cm (d) 34 cm
13. 13.True or false: to spot a red ball, use a sound sensor. (a) True (b) False
14. 14.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
15. 15.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
16. 16.🛞 Circumference = π × … (a) weight (b) speed (c) diameter (d) radius only
17. 17.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
19. 19.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) spokes (c) teeth (d) pins
20. 20.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 21 times. How many times does the driven gear turn?
21. 21.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
22. 22.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
23. 23.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
24. 24.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
25. 25.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
26. 26.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.🛞 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) spins right on the spot (b) goes straight back (c) turns right (d) goes straight forward
28. 28.📡 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)?
29. 29.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) the sky (d) black
30. 30.🛞 Which way of moving suits this best: “a muddy building site”? (a) tracks (b) propellers (c) wheels (d) legs
31. 31.Which job needs a light sensor? (a) warn if motors get hot (b) measure a turn angle (c) find the brightest spot (d) know a button is pressed
32. 32.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 27. What is under the sensor? (a) the black line (b) the white floor
33. 33.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
34. 34.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
35. 35.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
36. 36.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 180° (d) 45°
37. 37.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) faster and weaker (c) slower but stronger (d) not at all
38. 38.⚙️ 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 big driver gear (b) a small driver gear
39. 39.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.⚙️ 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

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