Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 717 · 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 10-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
2. 2.True or false: “crossing stepping-stones” suits propellers. (a) True (b) False
3. 3.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.🧭 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 right 60°, then left 45°. What does the gyro read now (0° to 359°)?
5. 5.Which job needs a camera? (a) stay balanced upright (b) measure a turn angle (c) read a QR code (d) start on a hand clap
6. 6.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
7. 7.🔍 Which sensor helps a robot find the brightest spot? (a) a sound sensor (b) a camera (c) a light sensor (d) a distance sensor
8. 8.🛞 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 backward. What does the robot do? (a) stays still (b) turns right (c) goes straight back (d) spins left on the spot
9. 9.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) propellers (b) tracks (c) wheels (d) legs
10. 10.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) faster but weaker (c) at the same speed (d) not at all
11. 11.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
12. 12.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
13. 13.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
14. 14.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
15. 15.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
17. 17.🧭 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 45°, then right 60°. What does the gyro read now (0° to 359°)?
18. 18.Which of these suits wheels? (a) moving under water (b) flying over a field (c) a field of tall boulders (d) a long factory floor
19. 19.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black soaks up light (c) black is hot (d) black is wet
20. 20.🦾 A servo moves from 10° to 100°. 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 95 and the right sensor reads 65. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
22. 22.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) harder to balance (c) too fast on floors (d) they are too cheap
23. 23.⚙️ A motor makes 90 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
24. 24.🛞 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 left (b) goes straight forward (c) stays still (d) turns right
25. 25.True or false: “a smooth classroom floor” suits wheels. (a) False (b) True
26. 26.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
27. 27.🧭 A robot faces east. It does: turn around, turn left, turn right, turn around. Which way does it face now? (a) north (b) west (c) south (d) east
28. 28.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
29. 29.⚙️ A motor makes 150 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
30. 30.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) at the same speed (c) not at all (d) slower but stronger
31. 31.Which job needs a temperature sensor? (a) warn if motors get hot (b) feel a bump into a wall (c) find the brightest spot (d) read a QR code
32. 32.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) zero (c) big (slow and strong) (d) small (fast, weak)
33. 33.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
34. 34.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
35. 35.📡 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?
36. 36.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
37. 37.⬛ A reading below the threshold means the sensor is over … (a) white (b) black (c) the sky (d) water
38. 38.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) to make it smaller (c) it goes there and back (d) sound is slow
40. 40.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small

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