Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 110 · 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 12-tooth gear drives a 48-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
2. 2.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
3. 3.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
4. 4.True or false: to stop before a wall, use a sound sensor. (a) True (b) False
5. 5.True or false: to measure a turn angle, use a distance sensor. (a) True (b) False
6. 6.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
7. 7.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
8. 8.⬛ A reading below the threshold means the sensor is over … (a) black (b) water (c) white (d) the sky
9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
10. 10.📡 A robot is 210 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 19 seconds (in cm)?
11. 11.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
12. 12.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
13. 13.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
14. 14.🔍 Which sensor helps a robot measure how far a box is? (a) a light sensor (b) a sound sensor (c) a distance sensor (d) a touch sensor
15. 15.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spread the weight (c) they are shiny (d) they spin in the air
16. 16.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 60. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
17. 17.🛞 Which way of moving suits this best: “deep mud”? (a) propellers (b) legs (c) wheels (d) tracks
18. 18.Which job needs a touch sensor? (a) feel a bump into a wall (b) stop before a wall (c) read a QR code (d) find the brightest spot
19. 19.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a snail (c) a cow (d) a bat
20. 20.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
21. 21.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
22. 22.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 2 (c) 1 (d) 3
24. 24.🧭 A robot should turn right 45°, but its gyro shows it turned 48°. How many degrees must it turn back to the left?
25. 25.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.Which job needs a light sensor? (a) hear a whistle (b) start on a hand clap (c) measure how far a box is (d) follow a black line
27. 27.📡 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
29. 29.🧭 A robot faces north. It does: turn around, turn right. Which way does it face now? (a) north (b) south (c) west (d) east
30. 30.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its diameter (c) its circumference (d) its weight
31. 31.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
32. 32.🛞 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 left on the spot (b) goes straight back (c) spins right on the spot (d) turns right
33. 33.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
34. 34.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a servo (b) a caster wheel (c) a gear (d) a track
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 70. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
36. 36.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
37. 37.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
38. 38.🔍 Which sensor helps a robot stop before a wall? (a) a temperature sensor (b) a camera (c) a gyro sensor (d) a distance sensor
39. 39.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) zero (d) big (slow and strong)
40. 40.🦾 A servo moves from 110° to 130°. How many degrees does it turn?

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