Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 980 · 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 sensor helps a robot measure how far a box is? (a) a distance sensor (b) a temperature sensor (c) a touch sensor (d) a camera
2. 2.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 65. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
4. 4.⚙️ 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
5. 5.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) goes straight back (b) spins left on the spot (c) stays still (d) goes straight forward
6. 6.📡 A robot is 170 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 6 seconds (in cm)?
7. 7.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
8. 8.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
9. 9.⚙️ A 12-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
10. 10.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🧭 A robot faces east. It does: turn right, turn left. Which way does it face now? (a) north (b) west (c) south (d) east
12. 12.🛞 Which way of moving suits this best: “hovering over a roof”? (a) wheels (b) legs (c) tracks (d) propellers
13. 13.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
14. 14.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
16. 16.🦾 A servo moves from 180° to 30°. How many degrees does it turn?
17. 17.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
19. 19.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a soft foam cushion (c) a wooden box (d) a flat wall
20. 20.🦾 A servo program runs:
    angle = 100
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.📡 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)?
22. 22.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
23. 23.🧭 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 0°. It turns right 60°, then left 60°, then right 180°. What does the gyro read now (0° to 359°)?
24. 24.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 2 (c) 4 (d) 3
25. 25.Which job needs a distance sensor? (a) measure a turn angle (b) know a button is pressed (c) start on a hand clap (d) stop before a wall
26. 26.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
27. 27.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
28. 28.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
29. 29.⚙️ A 20-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
30. 30.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
31. 31.⚙️ A motor makes 400 turns a minute with a 15-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
32. 32.🧭 A robot spins 15° every second. How many seconds does it take to turn 240°?
33. 33.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
34. 34.🔍 Which sensor helps a robot know a button is pressed? (a) a gyro sensor (b) a touch sensor (c) a distance sensor (d) a camera
35. 35.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) faster and weaker (c) not at all (d) slower but stronger
36. 36.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its weight (d) its circumference
37. 37.🧭 A robot spins 15° every second. How many seconds does it take to turn 105°?
38. 38.🧭 How many degrees is a full turn? (a) 180° (b) 100° (c) 360° (d) 90°
39. 39.📡 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?
40. 40.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spread the weight (c) they spin in the air (d) they are shiny

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