Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 798 · 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 job needs a camera? (a) measure how far a box is (b) spot a red ball (c) follow a black line (d) stay balanced upright
2. 2.🛞 Circumference = π × … (a) speed (b) weight (c) radius only (d) diameter
3. 3.🦾 A servo moves from 140° to 170°. How many degrees does it turn?
4. 4.🦾 A servo program runs:
   angle = 140
   angle = angle + 20
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ A 40-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
6. 6.True or false: to warn if motors get hot, use a temperature sensor. (a) True (b) False
7. 7.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
8. 8.🧭 A robot should turn right 45°, but its gyro shows it turned 59°. How many degrees must it turn back to the left?
9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
10. 10.🔍 What does a gyro sensor measure? (a) colour (b) temperature (c) sound (d) turning (rotation)
11. 11.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
12. 12.🧭 A robot should turn right 180°, but its gyro shows it turned 183°. How many degrees must it turn back to the left?
13. 13.⚙️ A motor makes 200 turns a minute with a 10-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
14. 14.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
15. 15.⬛ 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
16. 16.⚙️ A 16-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
17. 17.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) tyres (c) spokes (d) pins
19. 19.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
20. 20.⚙️ 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
21. 21.⬛ 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) far behind it (d) under the right sensor
22. 22.🧭 A robot should turn right 180°, but its gyro shows it turned 191°. How many degrees must it turn back to the left?
23. 23.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
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) spins right on the spot (b) goes straight forward (c) turns left (d) turns right
25. 25.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
26. 26.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
28. 28.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
30. 30.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
31. 31.🧭 A robot spins 90° every second. How many seconds does it take to turn 180°?
32. 32.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
33. 33.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
34. 34.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
35. 35.Which job needs a touch sensor? (a) hear a whistle (b) read a QR code (c) feel a bump into a wall (d) find the brightest spot
36. 36.⚙️ A 12-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
37. 37.⚙️ A 10-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
38. 38.Which job needs a sound sensor? (a) warn if motors get hot (b) start on a hand clap (c) find the brightest spot (d) feel a bump into a wall
39. 39.⚙️ 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 big driver gear (b) a small driver gear
40. 40.🧭 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 270°. It turns left 120°, then left 90°. What does the gyro read now (0° to 359°)?

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