Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 286 · 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.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
2. 2.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
3. 3.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
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 180°, then left 90°. What does the gyro read now (0° to 359°)?
5. 5.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
6. 6.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
7. 7.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
8. 8.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
9. 9.🛞 Circumference = π × … (a) speed (b) radius only (c) weight (d) diameter
10. 10.Which of these suits propellers? (a) crossing stepping-stones (b) deep mud (c) a smooth classroom floor (d) moving under water
11. 11.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) backwards (c) nowhere (d) slower
12. 12.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
13. 13.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
14. 14.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
15. 15.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
16. 16.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
17. 17.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
18. 18.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 44 cm?
19. 19.🛞 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) stays still (c) turns left (d) turns right
20. 20.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a gear (c) a wheel (d) an output
21. 21.🔍 Which sensor helps a robot follow a black line? (a) a camera (b) a temperature sensor (c) a touch sensor (d) a light sensor
22. 22.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
23. 23.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
24. 24.🧭 A robot faces north. It does: turn right, turn left, turn right. Which way does it face now? (a) south (b) north (c) east (d) west
25. 25.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 38. What is under the sensor? (a) the white floor (b) the black line
26. 26.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
27. 27.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is loud (d) black is hot
28. 28.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
29. 29.🔍 Which sensor helps a robot stop before a wall? (a) a camera (b) a distance sensor (c) a light sensor (d) a temperature sensor
30. 30.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 67. What is under the sensor? (a) the white floor (b) the black line
31. 31.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
32. 32.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 176 cm?
33. 33.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
34. 34.🔍 Which sensor helps a robot feel a bump into a wall? (a) a light sensor (b) a touch sensor (c) a camera (d) a gyro sensor
35. 35.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its circumference (d) its radius
37. 37.🦾 A servo moves from 70° to 170°. How many degrees does it turn?
38. 38.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
39. 39.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) wheels (c) tracks (d) propellers
40. 40.⚙️ A 12-tooth gear drives a 48-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?

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