Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 903 · 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 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)?
2. 2.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.🛞 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) spins right on the spot (b) stays still (c) goes straight forward (d) spins left on the spot
4. 4.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) hear claps (d) turn by exact angles
5. 5.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
6. 6.🔦 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) both sensors (c) the left sensor (d) the right sensor
7. 7.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
8. 8.🧭 A robot faces west. It does: turn right, turn around, turn right. Which way does it face now? (a) south (b) west (c) east (d) north
9. 9.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is hot (c) black soaks up light (d) black is wet
10. 10.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
11. 11.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
12. 12.🧭 A robot spins 45° every second. How many seconds does it take to turn 45°?
13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
14. 14.🔍 Which sensor helps a robot follow a black line? (a) a touch sensor (b) a light sensor (c) a temperature sensor (d) a camera
15. 15.🔍 Which sensor helps a robot read a QR code? (a) a sound sensor (b) a touch sensor (c) a camera (d) a distance sensor
16. 16.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) wheel size (d) number of gears
17. 17.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
18. 18.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.🧭 A robot should turn right 90°, but its gyro shows it turned 88°. How many degrees must it turn more to the right?
20. 20.🦾 A servo moves from 10° to 90°. How many degrees does it turn?
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 80. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
22. 22.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and left (b) points right (c) points left (d) points up and right
23. 23.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
24. 24.📡 A robot is 140 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 5 seconds (in cm)?
25. 25.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
27. 27.True or false: to feel a bump into a wall, use a light sensor. (a) False (b) True
28. 28.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
29. 29.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
30. 30.📡 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)?
31. 31.🧭 A robot faces west. It does: turn right, turn left. Which way does it face now? (a) north (b) west (c) east (d) south
32. 32.🔍 Which sensor helps a robot find the brightest spot? (a) a temperature sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
33. 33.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
34. 34.🛞 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?
35. 35.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 2 (c) 4 (d) 3
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
37. 37.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a caster wheel (c) a gear (d) a servo
38. 38.True or false: “a muddy building site” suits propellers. (a) False (b) True
39. 39.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
40. 40.Which job needs a temperature sensor? (a) start on a hand clap (b) measure a turn angle (c) know a button is pressed (d) warn if motors get hot

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