Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 425 · 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 motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
2. 2.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 85. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
3. 3.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the left sensor (c) far behind it (d) under the right sensor
4. 4.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
5. 5.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.🛞 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) turns left (b) turns right (c) stays still (d) spins left on the spot
7. 7.🦾 A servo moves from 10° to 130°. How many degrees does it turn?
8. 8.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
10. 10.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
11. 11.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
12. 12.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
13. 13.🔍 Which sensor helps a robot measure a turn angle? (a) a sound sensor (b) a distance sensor (c) a temperature sensor (d) a gyro sensor
14. 14.📡 A robot is 220 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 20 seconds (in cm)?
15. 15.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
17. 17.Which job needs a distance sensor? (a) measure how far a box is (b) warn if motors get hot (c) feel a bump into a wall (d) stay balanced upright
18. 18.Which of these suits wheels? (a) soft snow (b) flying over a field (c) loose sand dunes (d) a hospital corridor
19. 19.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
20. 20.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) the same direction (c) one up, one down (d) in opposite directions
21. 21.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
22. 22.True or false: to know a button is pressed, use a temperature sensor. (a) True (b) False
23. 23.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 25. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
25. 25.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a black line (c) a dark tunnel (d) a white surface
26. 26.True or false: “stepping over wide gaps” suits tracks. (a) False (b) True
27. 27.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a snail (c) a cow (d) a bat
28. 28.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.🧭 A robot spins 15° every second. How many seconds does it take to turn 15°?
30. 30.Which of these suits wheels? (a) hovering over a roof (b) a flat road (c) a muddy building site (d) flying over a field
31. 31.🧭 A robot faces east. It does: turn around, turn around, turn right, turn right. Which way does it face now? (a) south (b) north (c) west (d) east
32. 32.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
33. 33.🧭 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 120°, then left 120°, then left 90°. What does the gyro read now (0° to 359°)?
34. 34.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
35. 35.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
36. 36.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?
37. 37.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 95. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
38. 38.⚙️ A motor makes 300 turns a minute with a 15-tooth gear on it. That gear drives a 45-tooth gear. How many turns a minute does the 45-tooth gear make?
39. 39.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) number of gears (d) wheel size
40. 40.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor

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