Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 238 · 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.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
2. 2.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
3. 3.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
4. 4.Which of these suits tracks? (a) crossing stepping-stones (b) a smooth classroom floor (c) soft snow (d) a flat road
5. 5.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a bat (c) a snail (d) a cow
7. 7.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
8. 8.🧭 What does a gyro help a robot do? (a) see colours (b) hear claps (c) smell smoke (d) turn by exact angles
9. 9.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) slower but stronger (c) not at all (d) faster but weaker
10. 10.🧭 A robot faces west. It does: turn right, turn around, turn left, turn right. Which way does it face now? (a) west (b) north (c) east (d) south
11. 11.True or false: “loose sand dunes” suits propellers. (a) False (b) True
12. 12.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) propellers (b) wheels (c) tracks (d) legs
13. 13.⚙️ A 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
14. 14.🔍 Which sensor helps a robot read a QR code? (a) a camera (b) a touch sensor (c) a sound sensor (d) a light sensor
15. 15.🧭 A robot should turn right 90°, but its gyro shows it turned 84°. How many degrees must it turn more to the right?
16. 16.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22/7 (c) 22 (d) 7/22
17. 17.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
18. 18.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) zero (d) small (fast, weak)
19. 19.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) number of gears (d) motor volts
20. 20.🧭 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 left 45°, then left 120°. What does the gyro read now (0° to 359°)?
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 21. What is under the sensor? (a) the white floor (b) the black line
23. 23.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
24. 24.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
25. 25.📡 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?
26. 26.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) legs (b) tracks (c) propellers (d) wheels
27. 27.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 45. What is under the sensor? (a) the black line (b) the white floor
28. 28.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 594 cm?
29. 29.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a dark tunnel (c) a black surface (d) a white surface
30. 30.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 77. What is under the sensor? (a) the white floor (b) the black line
31. 31.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 3 cm (d) 1 km
32. 32.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they float (c) fast and easy on floors (d) they look funny
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 95. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
35. 35.🔍 Which sensor helps a robot follow a black line? (a) a sound sensor (b) a touch sensor (c) a gyro sensor (d) a light sensor
36. 36.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
37. 37.Which of these suits wheels? (a) a muddy building site (b) loose sand dunes (c) crossing stepping-stones (d) a smooth classroom floor
38. 38.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
39. 39.True or false: to measure a turn angle, use a light sensor. (a) True (b) False
40. 40.🛞 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) stays still (b) goes straight forward (c) spins right on the spot (d) turns right

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