Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 530 · 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 spins 90° every second. How many seconds does it take to turn 270°?
2. 2.⚙️ A 20-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
3. 3.🧭 A robot faces east. It does: turn right, turn around, turn right. Which way does it face now? (a) south (b) east (c) west (d) north
4. 4.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 70. What is under the sensor? (a) the white floor (b) the black line
5. 5.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
6. 6.🧭 A robot faces south. It does: turn around, turn left. Which way does it face now? (a) south (b) east (c) west (d) north
7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
8. 8.🧭 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 180°. It turns right 120°, then left 180°, then left 120°. What does the gyro read now (0° to 359°)?
9. 9.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
11. 11.True or false: to feel a bump into a wall, use a gyro sensor. (a) True (b) False
12. 12.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
14. 14.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) bright light (c) radio music (d) sound too high to hear
15. 15.🛞 Which way of moving suits this best: “hovering over a roof”? (a) legs (b) propellers (c) tracks (d) wheels
16. 16.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True
17. 17.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spread the weight (c) they are round (d) they spin in the air
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 90°. It turns left 45°, then left 135°, then right 135°. What does the gyro read now (0° to 359°)?
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 95. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
20. 20.True or false: to feel a bump into a wall, use a touch sensor. (a) True (b) False
21. 21.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) nowhere (c) backwards (d) faster
22. 22.🛞 Why do most indoor robots use wheels? (a) they float (b) they look funny (c) they climb stairs (d) fast and easy on floors
23. 23.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
24. 24.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
25. 25.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times faster (c) 3 times louder (d) 3 times bigger
26. 26.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) one wheel runs faster (c) it jumps (d) it uses a sail
27. 27.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) propellers (c) tracks (d) legs
28. 28.True or false: to find the brightest spot, use a touch sensor. (a) False (b) True
29. 29.Which job needs a light sensor? (a) hear a whistle (b) stay balanced upright (c) find the brightest spot (d) spot a red ball
30. 30.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 26. What is under the sensor? (a) the white floor (b) the black line
31. 31.🛞 Circumference = π × … (a) weight (b) diameter (c) radius only (d) speed
32. 32.📡 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) Yes (b) No
33. 33.⚙️ 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
34. 34.🧭 A robot faces west. It does: turn around, turn left, turn left, turn right. Which way does it face now? (a) west (b) north (c) east (d) south
35. 35.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
36. 36.True or false: “a flat road” suits tracks. (a) False (b) True
37. 37.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 352 cm?
38. 38.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
39. 39.🧭 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 45°, then right 60°, then right 180°. What does the gyro read now (0° to 359°)?
40. 40.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) legs (c) tracks (d) propellers

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