Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 479 · 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 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
2. 2.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) black (c) white (d) water
3. 3.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.Which job needs a camera? (a) know a button is pressed (b) follow a black line (c) measure a turn angle (d) read a QR code
5. 5.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
6. 6.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the top speed (c) the wheel size (d) the battery size
7. 7.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) the same direction (c) they do not turn (d) one up, one down
8. 8.🔍 What does a gyro sensor measure? (a) sound (b) turning (rotation) (c) temperature (d) colour
9. 9.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
10. 10.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
11. 11.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
12. 12.🛞 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 forward. What does the robot do? (a) stays still (b) turns right (c) turns left (d) goes straight forward
13. 13.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
14. 14.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
15. 15.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
16. 16.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) driver teeth (d) motor volts
17. 17.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a goldfish (c) a snail (d) a bat
18. 18.True or false: to find the brightest spot, use a light sensor. (a) False (b) True
19. 19.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) goes straight forward (b) spins right on the spot (c) spins left on the spot (d) goes straight back
20. 20.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) too fast on floors (c) harder to balance (d) they never tire
21. 21.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
22. 22.🦾 A servo moves from 110° to 80°. How many degrees does it turn?
23. 23.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 45° (d) 180°
24. 24.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
26. 26.Which job needs a touch sensor? (a) feel a bump into a wall (b) spot a red ball (c) measure how far a box is (d) find the brightest spot
27. 27.🛞 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 right (b) turns left (c) stays still (d) goes straight back
28. 28.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
29. 29.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
30. 30.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
31. 31.🧭 What does a gyro help a robot do? (a) hear claps (b) see colours (c) smell smoke (d) turn by exact angles
32. 32.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 15. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
35. 35.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
36. 36.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
37. 37.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) propellers (c) wheels (d) tracks
38. 38.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points straight up (b) points left (c) points right (d) points up and right
39. 39.📡 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?
40. 40.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22 (c) 2/7 (d) 22/7

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