Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 640 · 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.True or false: to stop before a wall, use a touch sensor. (a) True (b) False
2. 2.⚙️ A 12-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
3. 3.📡 A robot is 230 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 1 second (in cm)?
4. 4.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) nowhere (c) slower (d) backwards
5. 5.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 40. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors
6. 6.Which job needs a sound sensor? (a) start on a hand clap (b) feel a bump into a wall (c) follow a black line (d) measure a turn angle
7. 7.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
8. 8.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.⚙️ A motor makes 150 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
10. 10.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
12. 12.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a metal door (c) a soft foam cushion (d) a wooden box
13. 13.🔍 Which sensor helps a robot start on a hand clap? (a) a touch sensor (b) a distance sensor (c) a gyro sensor (d) a sound sensor
14. 14.True or false: “a flat road” suits legs. (a) False (b) True
15. 15.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times slower (d) 3 times bigger
16. 16.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
17. 17.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
18. 18.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
19. 19.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
20. 20.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a caster wheel (c) a gear (d) a servo
21. 21.🦾 A servo moves from 10° to 70°. How many degrees does it turn?
22. 22.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
24. 24.📡 A robot is 140 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 3 seconds (in cm)?
25. 25.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
26. 26.🦾 A servo program runs:
    angle = 110
    angle = angle − 60
    angle = angle − 10
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
27. 27.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
29. 29.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle + 60
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) pins (c) teeth (d) spokes
31. 31.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
32. 32.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) tracks (b) legs (c) propellers (d) wheels
33. 33.🦾 A servo moves from 170° to 80°. How many degrees does it turn?
34. 34.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
35. 35.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
36. 36.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black soaks up light (c) black is wet (d) black is loud
37. 37.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
38. 38.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
39. 39.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) slower but stronger (c) at the same speed (d) faster but weaker
40. 40.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 20. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor

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