Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 727 · 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 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) stays still (b) turns left (c) spins left on the spot (d) goes straight back
2. 2.🧭 What does a gyro help a robot do? (a) hear claps (b) turn by exact angles (c) smell smoke (d) see colours
3. 3.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) they do not turn (c) the same direction (d) one up, one down
4. 4.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
5. 5.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a sound sensor (c) a gyro sensor (d) a touch sensor
6. 6.🛞 Which way of moving suits this best: “hovering over a roof”? (a) propellers (b) tracks (c) wheels (d) legs
7. 7.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
8. 8.⚙️ A 12-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
9. 9.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 45° (d) 180°
10. 10.🛞 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) goes straight forward (b) spins left on the spot (c) spins right on the spot (d) goes straight back
11. 11.🦾 A servo program runs:
    angle = 160
    angle = angle + 20
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
12. 12.🧭 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 0°. It turns right 135°, then right 120°, then left 30°. What does the gyro read now (0° to 359°)?
13. 13.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 3 cm (c) 340 cm (d) 34 cm
14. 14.Which of these suits tracks? (a) a field of tall boulders (b) flying over a field (c) deep mud (d) a flat road
15. 15.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
17. 17.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) small (fast, weak) (d) never important
18. 18.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
19. 19.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
20. 20.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.🧭 A robot spins 30° every second. How many seconds does it take to turn 60°?
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
23. 23.Which job needs a light sensor? (a) know a button is pressed (b) feel a bump into a wall (c) spot a red ball (d) find the brightest spot
24. 24.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
25. 25.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
26. 26.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 660 cm?
27. 27.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
28. 28.📡 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)?
29. 29.Which job needs a distance sensor? (a) stay balanced upright (b) measure how far a box is (c) feel a bump into a wall (d) measure a turn angle
30. 30.🛞 Which way of moving suits this best: “flying over a field”? (a) legs (b) tracks (c) wheels (d) propellers
31. 31.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
33. 33.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
34. 34.🧭 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 0°. It turns left 135°, then right 45°. What does the gyro read now (0° to 359°)?
35. 35.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they float (c) they look funny (d) fast and easy on floors
36. 36.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
37. 37.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) pins (c) spokes (d) tyres
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.Which job needs a temperature sensor? (a) follow a black line (b) feel a bump into a wall (c) stay balanced upright (d) warn if motors get hot
40. 40.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?

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