Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 119 · 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 servo moves from 30° to 10°. How many degrees does it turn?
2. 2.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) legs (b) propellers (c) wheels (d) tracks
3. 3.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the top speed (c) the battery size (d) the wheel size
4. 4.⚙️ A 10-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
5. 5.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 20. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
6. 6.Which of these suits propellers? (a) moving under water (b) deep mud (c) soft snow (d) a field of tall boulders
7. 7.⚙️ A motor makes 280 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?
8. 8.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
9. 9.🧭 A robot should turn right 45°, but its gyro shows it turned 52°. How many degrees must it turn back to the left?
10. 10.📡 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?
11. 11.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) idler gear (c) tyre (d) driver gear
12. 12.🔍 Which sensor helps a robot feel a bump into a wall? (a) a gyro sensor (b) a temperature sensor (c) a distance sensor (d) a touch sensor
13. 13.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
14. 14.📡 A robot is 100 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
15. 15.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
16. 16.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
18. 18.True or false: “the output turns faster” happens when a big gear drives a small one. (a) True (b) False
19. 19.🧭 A robot spins 60° every second. How many seconds does it take to turn 180°?
20. 20.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) hear claps (d) turn by exact angles
22. 22.Which job needs a temperature sensor? (a) follow a black line (b) read a QR code (c) warn if motors get hot (d) stay balanced upright
23. 23.Which job needs a touch sensor? (a) measure how far a box is (b) spot a red ball (c) measure a turn angle (d) know a button is pressed
24. 24.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
25. 25.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
26. 26.🧭 A robot spins 15° every second. How many seconds does it take to turn 15°?
27. 27.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.🔍 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
29. 29.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
30. 30.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 180° (c) 90° (d) 360°
31. 31.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
32. 32.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
33. 33.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
34. 34.Which job needs a sound sensor? (a) know a button is pressed (b) start on a hand clap (c) measure a turn angle (d) follow a black line
35. 35.🧭 A robot should turn right 45°, but its gyro shows it turned 42°. How many degrees must it turn more to the right?
36. 36.🧭 A robot spins 30° every second. How many seconds does it take to turn 30°?
37. 37.⚙️ A motor makes 160 turns a minute with a 20-tooth gear on it. That gear drives an 80-tooth gear. How many turns a minute does the 80-tooth gear make?
38. 38.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
39. 39.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) radio music (c) water drops (d) bright light
40. 40.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids