Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 742 · 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.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) spokes (c) teeth (d) tyres
2. 2.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
3. 3.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 924 cm?
4. 4.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) tracks (c) legs (d) propellers
5. 5.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
6. 6.⚙️ A 40-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
7. 7.True or false: “a muddy building site” suits tracks. (a) False (b) True
8. 8.🧭 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 270°. It turns left 120°, then left 45°, then left 120°. What does the gyro read now (0° to 359°)?
9. 9.True or false: to spot a red ball, use a temperature sensor. (a) False (b) True
10. 10.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
11. 11.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
12. 12.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
13. 13.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) black (c) white (d) water
14. 14.📡 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?
15. 15.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
16. 16.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 1 (c) 3 (d) 2
17. 17.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
18. 18.🛞 Circumference = π × … (a) radius only (b) diameter (c) speed (d) weight
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
20. 20.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
21. 21.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
22. 22.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
23. 23.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
25. 25.Which job needs a light sensor? (a) measure a turn angle (b) follow a black line (c) measure how far a box is (d) stop before a wall
26. 26.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
27. 27.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
28. 28.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
29. 29.📡 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)?
30. 30.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.📡 A robot is 280 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
32. 32.🔍 Which sensor helps a robot feel a bump into a wall? (a) a temperature sensor (b) a gyro sensor (c) a touch sensor (d) a camera
33. 33.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 40. What is under the sensor? (a) the white floor (b) the black line
35. 35.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
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 backward. What does the robot do? (a) spins right on the spot (b) turns right (c) goes straight back (d) spins left on the spot
37. 37.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
38. 38.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
39. 39.⚙️ A motor makes 60 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?
40. 40.🧭 A robot faces east. It does: turn around, turn right. Which way does it face now? (a) south (b) west (c) east (d) north

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