Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 896 · 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 motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
2. 2.True or false: to hear a whistle, use a light sensor. (a) True (b) False
3. 3.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
4. 4.🧭 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 180°. It turns right 60°, then right 90°. What does the gyro read now (0° to 359°)?
5. 5.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) number of gears (d) wheel size
6. 6.Which of these suits propellers? (a) a long factory floor (b) a flat road (c) moving under water (d) a field of tall boulders
7. 7.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times louder (c) 3 times bigger (d) 3 times faster
8. 8.⚙️ A 24-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
9. 9.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
10. 10.⬛ A reading below the threshold means the sensor is over … (a) water (b) the sky (c) white (d) black
11. 11.True or false: “loose sand dunes” suits wheels. (a) False (b) True
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 180°. It turns right 180°, then right 180°, then left 180°. What does the gyro read now (0° to 359°)?
13. 13.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
14. 14.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
15. 15.🛞 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 right on the spot (b) spins left on the spot (c) goes straight back (d) stays still
16. 16.🛞 Circumference = π × … (a) weight (b) radius only (c) speed (d) diameter
17. 17.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
18. 18.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
19. 19.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
20. 20.Which of these suits wheels? (a) a muddy building site (b) hovering over a roof (c) a long factory floor (d) moving under water
21. 21.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points right (b) points up and right (c) points left (d) points up and left
22. 22.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
23. 23.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.True or false: “the output turns faster” happens when a small gear drives a big one. (a) False (b) True
26. 26.🛞 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) spins right on the spot (b) goes straight back (c) spins left on the spot (d) turns right
27. 27.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
28. 28.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
29. 29.Which job needs a light sensor? (a) spot a red ball (b) know a button is pressed (c) find the brightest spot (d) measure how far a box is
30. 30.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
31. 31.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
33. 33.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
34. 34.True or false: to read a QR code, use a touch sensor. (a) True (b) False
35. 35.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a servo (b) a track (c) a gear (d) a caster wheel
36. 36.🛞 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) turns left (b) goes straight forward (c) spins left on the spot (d) goes straight back
37. 37.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they are shiny (c) they spread the weight (d) they spin in the air
38. 38.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 792 cm?
39. 39.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
40. 40.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an input (c) an output (d) a gear

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