Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 141 · 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 feel a bump into a wall? (a) a distance sensor (b) a touch sensor (c) a sound sensor (d) a camera
2. 2.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.🔍 Which sensor helps a robot measure a turn angle? (a) a camera (b) a light sensor (c) a distance sensor (d) a gyro sensor
4. 4.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 2/7 (c) 22/7 (d) 7/22
5. 5.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
6. 6.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 35. What is under the sensor? (a) the black line (b) the white floor
7. 7.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 80. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
8. 8.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
9. 9.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
10. 10.🧭 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 90°. It turns right 120°, then left 135°, then left 135°. What does the gyro read now (0° to 359°)?
11. 11.Which job needs a light sensor? (a) read a QR code (b) follow a black line (c) start on a hand clap (d) stay balanced upright
12. 12.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
13. 13.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 67. What is under the sensor? (a) the black line (b) the white floor
14. 14.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
15. 15.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they are too cheap (c) harder to balance (d) they never tire
16. 16.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
17. 17.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
18. 18.🧭 A robot should turn right 180°, but its gyro shows it turned 174°. How many degrees must it turn more to the right?
19. 19.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
20. 20.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) slower but stronger (c) faster but weaker (d) at the same speed
21. 21.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
22. 22.🛞 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) spins right on the spot (b) turns left (c) stays still (d) turns right
23. 23.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
24. 24.🔍 Which sensor helps a robot warn if motors get hot? (a) a touch sensor (b) a temperature sensor (c) a distance sensor (d) a light sensor
25. 25.Which of these suits propellers? (a) loose sand dunes (b) flying over a field (c) a muddy building site (d) soft snow
26. 26.🔍 Which sensor helps a robot measure how far a box is? (a) a gyro sensor (b) a distance sensor (c) a touch sensor (d) a camera
27. 27.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
28. 28.⚙️ 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 small driver gear (b) a big driver gear
29. 29.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
30. 30.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the battery size (c) the wheel size (d) the top speed
31. 31.🧭 What does a gyro help a robot do? (a) smell smoke (b) turn by exact angles (c) hear claps (d) see colours
32. 32.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
33. 33.⚙️ A 16-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
34. 34.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
35. 35.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
36. 36.Which job needs a camera? (a) know a button is pressed (b) find the brightest spot (c) start on a hand clap (d) read a QR code
37. 37.⚙️ A motor makes 350 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
38. 38.True or false: “a muddy building site” suits wheels. (a) False (b) True
39. 39.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
40. 40.True or false: “a muddy building site” suits propellers. (a) False (b) True

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