Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 217 · 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.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
2. 2.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) the same direction (c) one up, one down (d) they do not turn
3. 3.🛞 Which way of moving suits this best: “deep mud”? (a) tracks (b) legs (c) wheels (d) propellers
4. 4.⚙️ A motor makes 240 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
5. 5.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
6. 6.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
7. 7.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
9. 9.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
10. 10.Which of these suits tracks? (a) a field of tall boulders (b) a long factory floor (c) a smooth classroom floor (d) a muddy building site
11. 11.📡 A robot is 170 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
12. 12.🔍 Why do robots need sensors? (a) to look colourful (b) to be heavier (c) to use more power (d) to know their world
13. 13.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 4 (c) 1 (d) 2
14. 14.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a dark tunnel (c) a white surface (d) a black surface
15. 15.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
16. 16.Which job needs a camera? (a) know a button is pressed (b) stop before a wall (c) measure how far a box is (d) read a QR code
17. 17.🔍 Which sensor helps a robot stop before a wall? (a) a temperature sensor (b) a distance sensor (c) a camera (d) a touch sensor
18. 18.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they spin in the air (c) they are shiny (d) they are round
19. 19.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
20. 20.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
21. 21.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 28 times. How many times does the driven gear turn?
22. 22.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
23. 23.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
24. 24.⚙️ A motor makes 120 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
25. 25.⚙️ A motor makes 100 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
26. 26.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
27. 27.🔍 Which sensor helps a robot read a QR code? (a) a temperature sensor (b) a light sensor (c) a camera (d) a gyro sensor
28. 28.🧭 A robot faces west. It does: turn right, turn around, turn left. Which way does it face now? (a) north (b) south (c) west (d) east
29. 29.🧭 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 right 135°, then left 90°. What does the gyro read now (0° to 359°)?
30. 30.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
31. 31.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times bigger (c) 3 times slower (d) 3 times faster
32. 32.📡 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)?
33. 33.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
34. 34.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
35. 35.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
36. 36.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
37. 37.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) under the right sensor (d) between the two sensors
38. 38.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
39. 39.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) turns left (b) stays still (c) spins left on the spot (d) turns right
40. 40.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 176 cm?

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