Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 486 · 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 light sensor reads below 30 over a black line and above 30 over the white floor. It reads 22. What is under the sensor? (a) the white floor (b) the black line
2. 2.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
3. 3.⚙️ A motor makes 270 turns a minute with a 10-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
5. 5.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
6. 6.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
7. 7.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times slower (d) 3 times bigger
8. 8.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
9. 9.Which job needs a sound sensor? (a) measure how far a box is (b) follow a black line (c) stop before a wall (d) hear a whistle
10. 10.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
11. 11.📡 A robot is 200 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 1 second (in cm)?
12. 12.📡 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)?
13. 13.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) spins right on the spot (b) goes straight forward (c) turns left (d) turns right
14. 14.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
15. 15.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
16. 16.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) under the right sensor (d) far behind it
17. 17.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 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
18. 18.🧭 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 left 60°, then left 90°. What does the gyro read now (0° to 359°)?
19. 19.⚙️ A 100-tooth driver gear turns a 20-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
20. 20.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a dark tunnel (c) a black line (d) a black surface
21. 21.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
22. 22.🔍 Which sensor helps a robot stay balanced upright? (a) a sound sensor (b) a gyro sensor (c) a touch sensor (d) a distance sensor
23. 23.Which job needs a distance sensor? (a) hear a whistle (b) find the brightest spot (c) start on a hand clap (d) stop before a wall
24. 24.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they climb stairs (c) they float (d) fast and easy on floors
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
26. 26.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) see colours (d) turn by exact angles
27. 27.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is hot (c) black is loud (d) black soaks up light
28. 28.🧭 A robot faces north. It does: turn left, turn left, turn right. Which way does it face now? (a) east (b) west (c) north (d) south
29. 29.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) turns right (b) spins left on the spot (c) goes straight forward (d) turns left
30. 30.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
31. 31.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
32. 32.Which job needs a light sensor? (a) measure a turn angle (b) read a QR code (c) find the brightest spot (d) start on a hand clap
33. 33.🔍 Which sensor helps a robot stop before a wall? (a) a touch sensor (b) a gyro sensor (c) a distance sensor (d) a light sensor
34. 34.🛞 Circumference = π × … (a) diameter (b) weight (c) speed (d) radius only
35. 35.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
36. 36.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
37. 37.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
38. 38.True or false: to spot a red ball, use a camera. (a) False (b) True
39. 39.True or false: “crossing stepping-stones” suits propellers. (a) True (b) False
40. 40.True or false: to feel a bump into a wall, use a camera. (a) True (b) False

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