Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 657 · 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 robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
2. 2.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
3. 3.True or false: “moving under water” suits wheels. (a) False (b) True
4. 4.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 57. What is under the sensor? (a) the black line (b) the white floor
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
6. 6.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 550 cm?
7. 7.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
8. 8.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
9. 9.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size
10. 10.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
11. 11.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
12. 12.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) tracks (b) wheels (c) propellers (d) legs
13. 13.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
14. 14.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
15. 15.📡 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?
16. 16.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
17. 17.🛞 Which way of moving suits this best: “hovering over a roof”? (a) wheels (b) tracks (c) propellers (d) legs
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 right 135°, then right 45°. What does the gyro read now (0° to 359°)?
19. 19.Which of these suits legs? (a) hovering over a roof (b) loose sand dunes (c) crossing stepping-stones (d) moving under water
20. 20.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
21. 21.🔍 Which sensor helps a robot read a QR code? (a) a camera (b) a distance sensor (c) a light sensor (d) a touch sensor
22. 22.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) spokes (c) tyres (d) teeth
23. 23.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 90° (d) 100°
24. 24.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
25. 25.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
26. 26.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
27. 27.Which job needs a temperature sensor? (a) feel a bump into a wall (b) find the brightest spot (c) warn if motors get hot (d) spot a red ball
28. 28.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an output (c) an input (d) a wheel
29. 29.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
30. 30.🛞 Which way of moving suits this best: “soft snow”? (a) tracks (b) wheels (c) legs (d) propellers
31. 31.Which of these suits legs? (a) a smooth classroom floor (b) deep mud (c) a muddy building site (d) a field of tall boulders
32. 32.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
33. 33.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
34. 34.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they float (c) they climb stairs (d) fast and easy on floors
35. 35.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
36. 36.🛞 Circumference = π × … (a) speed (b) weight (c) diameter (d) radius only
37. 37.🔍 Which sensor helps a robot feel a bump into a wall? (a) a light sensor (b) a distance sensor (c) a gyro sensor (d) a touch sensor
38. 38.Which of these suits wheels? (a) moving under water (b) deep mud (c) a hospital corridor (d) loose sand dunes
39. 39.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
40. 40.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 4 (c) 2 (d) 1

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