Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 527 · 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 15° every second. How many seconds does it take to turn 15°?
2. 2.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
3. 3.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
4. 4.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
5. 5.📡 A robot is 130 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 18 seconds (in cm)?
6. 6.Which job needs a camera? (a) follow a black line (b) find the brightest spot (c) know a button is pressed (d) spot a red ball
7. 7.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spin in the air (c) they spread the weight (d) they are round
8. 8.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
9. 9.🔍 Which sensor helps a robot find the brightest spot? (a) a touch sensor (b) a temperature sensor (c) a gyro sensor (d) a light sensor
10. 10.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
11. 11.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) one wheel runs faster (c) it uses a sail (d) it stops for ever
12. 12.🔍 What does a gyro sensor measure? (a) colour (b) turning (rotation) (c) sound (d) temperature
13. 13.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) number of gears (d) wheel size
15. 15.Which of these suits wheels? (a) flying over a field (b) moving under water (c) a smooth classroom floor (d) stepping over wide gaps
16. 16.True or false: to read a QR code, use a camera. (a) False (b) True
17. 17.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 48. What is under the sensor? (a) the white floor (b) the black line
19. 19.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 2 (c) 4 (d) 1
20. 20.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
21. 21.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) slower but stronger (d) at the same speed
22. 22.🔍 Why do robots need sensors? (a) to know their world (b) to use more power (c) to look colourful (d) to be heavier
23. 23.🔍 Which sensor helps a robot stop before a wall? (a) a distance sensor (b) a gyro sensor (c) a temperature sensor (d) a camera
24. 24.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
25. 25.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 90. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
26. 26.📡 A robot is 100 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 4 seconds (in cm)?
27. 27.🧭 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 left 45°, then right 30°. What does the gyro read now (0° to 359°)?
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 270°. It turns left 120°, then left 135°. What does the gyro read now (0° to 359°)?
29. 29.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
30. 30.Which of these suits tracks? (a) a smooth classroom floor (b) a long factory floor (c) soft snow (d) stepping over wide gaps
31. 31.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) it goes there and back (c) sound is slow (d) the sensor is half
32. 32.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
33. 33.🦾 A servo moves from 130° to 0°. How many degrees does it turn?
34. 34.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
35. 35.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) small (fast, weak) (c) never important (d) big (slow and strong)
36. 36.🦾 A servo program runs:
    angle = 100
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 43. What is under the sensor? (a) the white floor (b) the black line
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
39. 39.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
40. 40.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a black surface (c) a white surface (d) a dark tunnel

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