Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 773 · 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.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
2. 2.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
4. 4.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
5. 5.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
6. 6.Which job needs a touch sensor? (a) spot a red ball (b) start on a hand clap (c) warn if motors get hot (d) feel a bump into a wall
7. 7.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
8. 8.Which job needs a light sensor? (a) follow a black line (b) measure how far a box is (c) measure a turn angle (d) read a QR code
9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
10. 10.🧭 A robot faces south. It does: turn around, turn right, turn right. Which way does it face now? (a) south (b) east (c) north (d) west
11. 11.🔍 Which sensor helps a robot feel a bump into a wall? (a) a touch sensor (b) a camera (c) a light sensor (d) a temperature sensor
12. 12.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
13. 13.True or false: to read a QR code, use a gyro sensor. (a) False (b) True
14. 14.🦾 A servo moves from 30° to 180°. How many degrees does it turn?
15. 15.🧭 A robot should turn right 45°, but its gyro shows it turned 46°. How many degrees must it turn back to the left?
16. 16.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
17. 17.True or false: to measure a turn angle, use a sound sensor. (a) False (b) True
18. 18.🛞 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 backward. What does the robot do? (a) spins left on the spot (b) turns left (c) spins right on the spot (d) turns right
19. 19.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 1 km (c) 340 cm (d) 34 cm
20. 20.🛞 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 2 times. How far does the robot roll (in cm)?
21. 21.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
22. 22.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black surface (c) a white surface (d) a black line
23. 23.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 90. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
25. 25.Which job needs a camera? (a) measure how far a box is (b) read a QR code (c) stay balanced upright (d) measure a turn angle
26. 26.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 7/22 (c) 22/7 (d) 2/7
27. 27.🛞 Circumference = π × … (a) radius only (b) weight (c) diameter (d) speed
28. 28.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spread the weight (c) they spin in the air (d) they are shiny
29. 29.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
30. 30.True or false: to feel a bump into a wall, use a touch sensor. (a) True (b) False
31. 31.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) never important (c) zero (d) small (fast, weak)
32. 32.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
33. 33.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
34. 34.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 990 cm?
35. 35.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
36. 36.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: to measure how far a box is, use a sound sensor. (a) False (b) True
38. 38.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
39. 39.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
40. 40.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 51. What is under the sensor? (a) the black line (b) the white floor

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