Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 239 · 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.🛞 Which way of moving suits this best: “moving under water”? (a) wheels (b) legs (c) propellers (d) tracks
2. 2.True or false: to find the brightest spot, use a sound sensor. (a) True (b) False
3. 3.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
5. 5.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
6. 6.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
7. 7.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
8. 8.Which of these suits wheels? (a) moving under water (b) loose sand dunes (c) a smooth classroom floor (d) deep mud
9. 9.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) nowhere (c) slower (d) backwards
10. 10.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
11. 11.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
12. 12.🧭 A robot should turn right 45°, but its gyro shows it turned 42°. How many degrees must it turn more to the right?
13. 13.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) sound too high to hear (d) water drops
14. 14.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) propellers (b) tracks (c) legs (d) wheels
15. 15.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 60. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
16. 16.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a black line (c) a white surface (d) a dark tunnel
17. 17.🔍 Which sensor helps a robot follow a black line? (a) a gyro sensor (b) a temperature sensor (c) a distance sensor (d) a light sensor
18. 18.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) not at all (c) at the same speed (d) faster but weaker
19. 19.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its radius (d) its circumference
20. 20.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is wet (c) black is loud (d) black is hot
21. 21.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
22. 22.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
23. 23.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 40. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
25. 25.True or false: “a smooth classroom floor” suits wheels. (a) False (b) True
26. 26.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
27. 27.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 10. What is under the sensor? (a) the white floor (b) the black line
28. 28.🔍 Which sensor helps a robot stay balanced upright? (a) a temperature sensor (b) a touch sensor (c) a gyro sensor (d) a light sensor
29. 29.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) never important (d) big (slow and strong)
30. 30.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
31. 31.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) wheel size (d) number of gears
32. 32.⚙️ 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
33. 33.⚙️ 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?
34. 34.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
35. 35.🔍 Which sensor helps a robot feel a bump into a wall? (a) a camera (b) a distance sensor (c) a touch sensor (d) a light sensor
36. 36.⚙️ 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
37. 37.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
38. 38.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
39. 39.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?

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