Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 170 · 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 60 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
2. 2.Which job needs a temperature sensor? (a) spot a red ball (b) read a QR code (c) hear a whistle (d) warn if motors get hot
3. 3.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a flat wall (c) a soft foam cushion (d) a wooden box
4. 4.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
5. 5.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
6. 6.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
7. 7.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
8. 8.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
9. 9.🔍 Which sensor helps a robot know a button is pressed? (a) a temperature sensor (b) a gyro sensor (c) a touch sensor (d) a camera
10. 10.🦾 A servo moves from 50° to 110°. How many degrees does it turn?
11. 11.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) fast and easy on floors (d) they float
12. 12.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle + 10
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
13. 13.Which job needs a camera? (a) hear a whistle (b) spot a red ball (c) find the brightest spot (d) start on a hand clap
14. 14.🧭 A robot should turn right 45°, but its gyro shows it turned 40°. How many degrees must it turn more to the right?
15. 15.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 24. What is under the sensor? (a) the white floor (b) the black line
16. 16.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a wheel (c) an output (d) a gear
17. 17.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
18. 18.🧭 How many degrees is a right-angle turn? (a) 90° (b) 180° (c) 45° (d) 360°
19. 19.Which of these suits wheels? (a) stepping over wide gaps (b) a long factory floor (c) soft snow (d) loose sand dunes
20. 20.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
21. 21.🛞 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 backward. What does the robot do? (a) turns left (b) spins left on the spot (c) spins right on the spot (d) goes straight forward
22. 22.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
23. 23.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
24. 24.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
25. 25.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
26. 26.True or false: “soft snow” suits tracks. (a) False (b) True
27. 27.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
28. 28.🧭 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 90°. It turns left 90°, then left 90°. What does the gyro read now (0° to 359°)?
29. 29.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
30. 30.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
33. 33.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 360° (c) 180° (d) 45°
35. 35.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
36. 36.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
37. 37.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its circumference (d) its radius
38. 38.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 90. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
40. 40.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 3 cm (c) 340 cm (d) 34 cm

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