Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 811 · 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 common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
2. 2.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) slower (c) nowhere (d) faster
3. 3.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they spread the weight (c) they are shiny (d) they are round
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 25. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
5. 5.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 27. What is under the sensor? (a) the black line (b) the white floor
6. 6.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
7. 7.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 100° (d) 90°
8. 8.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
9. 9.📡 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 7 seconds (in cm)?
10. 10.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
11. 11.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
12. 12.🔍 Which sensor helps a robot feel a bump into a wall? (a) a camera (b) a light sensor (c) a touch sensor (d) a temperature sensor
13. 13.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) they do not turn (c) in opposite directions (d) one up, one down
14. 14.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
15. 15.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
16. 16.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 14 times. How many times does the driven gear turn?
17. 17.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
18. 18.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 15. What is under the sensor? (a) the black line (b) the white floor
19. 19.⚙️ A motor makes 200 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
20. 20.🔍 What does a gyro sensor measure? (a) sound (b) colour (c) turning (rotation) (d) temperature
21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
22. 22.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) at the same speed (c) faster but weaker (d) not at all
23. 23.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
24. 24.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
25. 25.🦾 A servo moves from 10° to 20°. How many degrees does it turn?
26. 26.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 40. What is under the sensor? (a) the black line (b) the white floor
27. 27.Which job needs a sound sensor? (a) hear a whistle (b) measure how far a box is (c) know a button is pressed (d) read a QR code
28. 28.📡 A robot is 130 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 4 seconds (in cm)?
29. 29.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
30. 30.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
31. 31.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 17. What is under the sensor? (a) the white floor (b) the black line
33. 33.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
34. 34.🛞 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 forward. What does the robot do? (a) turns right (b) stays still (c) spins left on the spot (d) goes straight forward
35. 35.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
36. 36.🧭 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 right 135°, then right 135°, then left 45°. What does the gyro read now (0° to 359°)?
37. 37.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
38. 38.🛞 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
39. 39.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its circumference (d) its weight

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