Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 924 · 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 job needs a light sensor? (a) stop before a wall (b) find the brightest spot (c) read a QR code (d) hear a whistle
2. 2.🧭 A robot faces north. It does: turn around, turn around. Which way does it face now? (a) east (b) west (c) south (d) north
3. 3.True or false: to measure how far a box is, use a distance sensor. (a) True (b) False
4. 4.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) spins left on the spot (b) goes straight back (c) spins right on the spot (d) goes straight forward
5. 5.True or false: “a hospital corridor” suits legs. (a) True (b) False
6. 6.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) they do not turn (c) the same direction (d) one up, one down
7. 7.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
9. 9.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
10. 10.📡 A robot is 100 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 1 second (in cm)?
11. 11.⚙️ A motor makes 240 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?
12. 12.🔍 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
13. 13.⚙️ A motor makes 220 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
14. 14.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.🛞 Circumference = π × … (a) weight (b) speed (c) radius only (d) diameter
16. 16.🛞 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) turns left (c) goes straight back (d) spins right on the spot
17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
18. 18.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
19. 19.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
20. 20.Which of these suits legs? (a) flying over a field (b) soft snow (c) a hospital corridor (d) crossing stepping-stones
21. 21.Which job needs a camera? (a) measure how far a box is (b) measure a turn angle (c) feel a bump into a wall (d) spot a red ball
22. 22.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
23. 23.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
24. 24.🧭 A robot faces south. It does: turn left, turn around, turn right. Which way does it face now? (a) east (b) west (c) north (d) south
25. 25.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
26. 26.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
27. 27.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.🦾 A servo moves from 130° to 20°. How many degrees does it turn?
29. 29.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a bat (c) a goldfish (d) a cow
30. 30.Which job needs a sound sensor? (a) stay balanced upright (b) warn if motors get hot (c) hear a whistle (d) stop before a wall
31. 31.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
32. 32.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) legs (c) propellers (d) wheels
33. 33.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
34. 34.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 60. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
36. 36.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) wheel size (d) driver teeth
37. 37.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
39. 39.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True

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