Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 951 · 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 robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.🔍 Which sensor helps a robot measure a turn angle? (a) a gyro sensor (b) a distance sensor (c) a light sensor (d) a camera
3. 3.True or false: “a flat road” suits legs. (a) True (b) False
4. 4.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
5. 5.True or false: to measure a turn angle, use a gyro sensor. (a) True (b) False
6. 6.Which job needs a light sensor? (a) know a button is pressed (b) spot a red ball (c) hear a whistle (d) find the brightest spot
7. 7.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) wheel size (d) number of gears
8. 8.📡 A robot is 150 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 6 seconds (in cm)?
9. 9.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 1056 cm?
10. 10.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 40. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
11. 11.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
12. 12.🦾 A servo moves from 30° to 10°. How many degrees does it turn?
13. 13.🧭 A robot should turn right 90°, but its gyro shows it turned 97°. How many degrees must it turn back to the left?
14. 14.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle − 20
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.📡 A robot is 100 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 5 seconds (in cm)?
17. 17.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 792 cm?
18. 18.Which job needs a sound sensor? (a) know a button is pressed (b) hear a whistle (c) find the brightest spot (d) read a QR code
19. 19.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
20. 20.True or false: “moving under water” suits wheels. (a) False (b) True
21. 21.⬛ The threshold of a light sensor is … (a) the top speed (b) the wheel size (c) the battery size (d) the black/white cut-off
22. 22.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
23. 23.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it jumps (c) it uses a sail (d) one wheel runs faster
24. 24.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
25. 25.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 60. What is under the sensor? (a) the white floor (b) the black line
26. 26.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 70. What is under the sensor? (a) the black line (b) the white floor
27. 27.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a gyro sensor (c) a camera (d) a sound sensor
28. 28.⚙️ 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
29. 29.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
30. 30.🧭 A robot faces east. It does: turn right, turn left. Which way does it face now? (a) west (b) east (c) north (d) south
31. 31.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
32. 32.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
33. 33.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
35. 35.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
36. 36.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
37. 37.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
38. 38.🛞 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 forward. What does the robot do? (a) goes straight forward (b) turns left (c) spins right on the spot (d) spins left on the spot
39. 39.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a track (c) a gear (d) a servo
40. 40.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?

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